GB2153258A - Process for the production of a composite friction bearing material - Google Patents
Process for the production of a composite friction bearing material Download PDFInfo
- Publication number
- GB2153258A GB2153258A GB08432149A GB8432149A GB2153258A GB 2153258 A GB2153258 A GB 2153258A GB 08432149 A GB08432149 A GB 08432149A GB 8432149 A GB8432149 A GB 8432149A GB 2153258 A GB2153258 A GB 2153258A
- Authority
- GB
- United Kingdom
- Prior art keywords
- process according
- phenolic resin
- adhesive layer
- coating
- substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000463 material Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000002131 composite material Substances 0.000 title claims description 16
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 239000005011 phenolic resin Substances 0.000 claims abstract description 28
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 28
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 24
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 24
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 24
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 24
- 239000000758 substrate Substances 0.000 claims abstract description 21
- 239000012790 adhesive layer Substances 0.000 claims abstract description 20
- 239000000203 mixture Substances 0.000 claims abstract description 19
- 239000011248 coating agent Substances 0.000 claims abstract description 16
- 238000000576 coating method Methods 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 239000011133 lead Substances 0.000 claims abstract description 8
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 6
- 239000000057 synthetic resin Substances 0.000 claims abstract description 6
- 238000009833 condensation Methods 0.000 claims abstract description 4
- 230000005494 condensation Effects 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 2
- 239000002783 friction material Substances 0.000 claims description 2
- 235000011837 pasties Nutrition 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 238000007788 roughening Methods 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 claims 2
- 238000003801 milling Methods 0.000 claims 1
- 230000004048 modification Effects 0.000 claims 1
- 238000012986 modification Methods 0.000 claims 1
- 239000010410 layer Substances 0.000 description 16
- 238000007596 consolidation process Methods 0.000 description 6
- 238000005245 sintering Methods 0.000 description 3
- 229910000906 Bronze Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000010974 bronze Substances 0.000 description 2
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 2
- 239000003085 diluting agent Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
- B05D5/083—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers
- B05D5/086—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface involving the use of fluoropolymers having an anchoring layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0209—Multistage baking
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08L27/18—Homopolymers or copolymers or tetrafluoroethene
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/20—Sliding surface consisting mainly of plastics
- F16C33/201—Composition of the plastic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
Landscapes
- Chemical & Material Sciences (AREA)
- Medicinal Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Sliding-Contact Bearings (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Lubricants (AREA)
- Laminated Bodies (AREA)
Abstract
A process for producing a bearing material from a powdered or granular mixture of polytetrafluoroethylene, lead and synthetic resin applied to a treated metallic substrate with a porous adhesive layer and using alternating pressures and temperatures so that there is obtained a coating at least 0.2 mm thick. a) on the adhesive layer on the substrate there is applied a coating comprising 37% crystalline polytetrafluoroethylene, 50% lead powder and 13% phenolic resin, there follows b) heat treatment of the coated substrate for pre-condensation of the phenolic resin at about 85 DEG C. for 60 minutes, whereafter c) the coating is pressed with the adhesive layer at 90 DEG C. and a pressure of from 20 to 40 MPa and then, for hardening the phenolic resin, d) there follows a pressureless heat treatment at 145 DEG C. for 25 minutes and, e) the coating is post-compressed against the substrate at 90 DEG C. and 20 to 40 MPa pressure.
Description
SPECIFICATION
Process for the production of a composite friction bearing material
The present invention is concerned with a process for the production of composite friction bearing material from a preferably powdered or granular mixture of polytetrafluoroethylene, lead and synthetic resin, especially phenolic resin, which is applied to a pretreated, metallic substrate with a porous adhesive layer and, by the application of alternating pressures and temperatures, is caused to adhere and is consolidated in such a manner that, in the final state, over the adhesive layer there is obtained a bearing material layer of at least 0.2 mm.
Composite friction bearings as machine elements for the transmission of power from moving to stationary machine parts have been known for many years. They consist of at least two work materials with different mechanical properties: a supporting body or a substrate which takes up the bearing material and mainly ensures the take up of power and a layer of bearing material which ensures the relative movement of the moving to to the stationary bearing component without disturbance in all operational states. Depending upon the bearing load, given by the magnitude of the forces to be taken up, the rubbing speed and constructional characteristics, various metallic and non-metallic sliding materials have hitherto been used in composite friction bearings.
To the best known metallic sliding materials belong, for example, lead bronzes, tin, cadmium and the like, whereas as non-metallic sliding materials there are known graphite and, in particular, synthetic resins in the form of phenolic resins and polyfluoroolefins.
In order to be able to utilise the advantages of the most varied bearing materials without having to put up with their disadvantages, highly stressed friction bearings are generally of multi-layer construction and, for maintenance-free operating friction bearings, the participation of polytetrafluoroethylene has proved to be especially preferable. Such friction bearings and processes for the production thereof are known, for example, from Federal
Republic of Germany Patent Specification No.
1,065,182, British Patent Specification No.
1,025,036 and U.S. Patent Specification No.
2,691,814. According to these, a metallic carrier body is appropriately pre-treated and a porous bronze powder layer is then sintered thereon. On to this sintered structure is applied crystalline polytetrafluoroethylene alone or in combination with metallic lead, this coating being pressed into the porous sintered bronze layer with the appiication of heat. In order, on the one hand, to bond the polytetrafluoroethylene particles with the sintered structure and, on the other hand, to make the mechanical properties of the polytetrafluoroethylene itself more favourable, a heat treatment above the crystal melting point of 327 C., preferably at 350 to 400"C., is a process step regarded as being necessary.
These known friction bearings operate without maintenance but the production thereof is difficult and laborious. Besides the sintering on of the bronze powder, it is, from the energy point of view, especially disadvantageous that the complete friction bearing body must, for the recrystallisation of the polytetrafluoroethylene, be exposed to a temperature above 327"C. for a certain period of time and thereafter must be quenched in order to achieve the amorphous state.
Finally, it is disadvantageous that the thickness of the layer lying above the sinter bronze is generally less than 50 jum. and this thin layer, in practical use, as friction bearing material, is rapidly worn off so that the load lies at least partly on the sintered structure, which considerably increases the friction value. Furthermore, in the case of running layers of the stated thickness, it is practically impossible to carry out working by turning which, for some cases of use, is regarded as being disadvantageous.
German Democratic Republic Patent Specification No. 61,393 describes a process for producing bearing materials which overcomes the disadvantages of the above-described friction bearings. In this case, on to a metallic substrate, which has been pre-treated, there is applied a synthetic resin dissolving binding agent based on butyl acetate and there is then applied thereon a powdered or granular mixture of polytetrafluoroethylene, lead and phenolic resin in a weight ratio of 30:57:13, followed by consolidation thereof at alternating pressures and temperatures.
Although this process manages without a sintering apparatus and thus the high temperatures required for the sintering process are avoided and, as a result of a thicker bearing layer, an after-working by turning is also possible, nevertheless heating the bearing material to a temperature above 327 C. is necessary in order to convert the crystalline polytetrafluoroethylene present in the mixture into an amorphous state, as well as to obtain this state by means of quenching.
It is an object of the present invention to provide a technically simplified process for the production of a friction bearing material with especially good bearing properties for maintenance-free operation.
It is a further object of the present invention to provide a process for the production of a composite friction bearing material with a running layer made of polytetrafluoroethylene, lead and phenolic resin, which process can be carried out at lower temperatures, for example below 100 C.
Thus, according to the present invention, there is provided a process for the production of a composite friction bearing material from a preferably powdered or granular mixture of polytetrafluoroethylene, lead and synthetic resin which is applied to a pre-treated metallic substrate with a porous adhesive layer and with the use of alternating pressures and temperatures for the adhesion in such a manner that, in the final state, over the adhesive layer there is obtained a friction material coating of at least 0.2 mm. thickness, wherein a) on the adhesive layer connected to the substrate there is first carried out, by means of an appropriate device, a dry coating with a mixture of a sliding material comprising, by weight, 37% of crystalline polytetrafluoroethylene, 50% of lead powder and 13% of phenolic resin, there then follows b) a heat treatment of the coated substrate for pre-condensation of the phenolic resin at about 85"C. for 60 minutes, whereafter c) the coating is pressed with the adhesive layer at a temperature of about 90"C. and a pressure of from 20 to 40 MPa and then, after hardening the phenolic resin, d) there follows a pressureless heat treatment at a temperature of about 145"C. for 25 minutes and finally e) the coating is post-compressed against the substrate at a temperature of 90"C. and a pressure of about 20 to 40 MPa.
For a good bonding of the metallic and nonmetallic components of the sliding material mixture to one another and to the substrate, it is advantageous when the particle size of the polytetrafluoroethylene is less than 600 yam., that of the lead powder is less than 80m.
and that of the phenolic resin is less than 100 ILm.
The adhesion of the sliding material layer, as well as of the adhesive layer, to the substrate, which is preferably a steel sheet, can be improved by mechanically or chemically roughening the substrate on the side to be coated, preferably by grinding.
According to another embodiment of the present invention, instead of applying the sliding material mixture in powder form, it can be applied to the adhesive layer in the form of a paste. For this purpose, the phenolic resin is dissolved in an appropriate diluent, for example in spirit, mixed with the other components and sprinkled or raked on. The use of a diluent has the advantage of binding dust in the case of working up and of a fine dissolving of the phenolic resin. However, before further working up, it is necessary to evaporated the solvent from the coating material for a certain period of time at ambient or elevated temperature.
According to a preferred embodiment of the present invention, the pressing and post-compression of the friction bearing material takes place with a pressure action of 25 seconds.
By means of the present invention, the known good running properties of maintenance-free friction bearings with polytetrafluoroethylene and metallic additives are fully maintained. However, by means of the production process according to the present invention, the previously employed heat postfreatment and quenching of the friction bearing body can be omitted.The present invention offers the surprising advantage that the omission of the heat treatment of the polytetrafluoroethylene above the crystallisation melting point for the conversion of the structure from the crystalline form into the amorphous form, hitherto usually regarded as being necessary, proves to be so positive that. in combination with the described process steps, in the case of the participation of phenolic resins, a higher running capacity is achieved and that the binding of the running layer on to the substrate is extraordinarily good in spite of the omission of a high temperature treatment.A so-called reversible reformation of the polytetrafluoroethylene admittedly leads to a mechanical consolidation thereof, which is required and is also used for friction bearing materials produced in other ways with large amounts of polytetrafluoroethylene, but, in the case of the process according to the present invention for the production of composite friction bearing materials, this can advantageously be omitted. Nevertheless, under maintenance-free conditions, there can, with limitation, be achieved a considerably greater life, the homogeneous composition of the running layer thereby acting in full thickness as a dry lubricant.
The higher functional value of the composite friction bearing material produced by the process according to the present invention also results from the fact that the low degree of thermal stressing during the production thereof completely excludes thermal damaging of the phenolic resin. A further advantage of the carrying out of the process according to the present invention is also the pressureless thermal hardening of the phenolic resin component of the friction bearing mixture, which is not usual for the working up of phenolic resins of the kind used, which, in combination with the other process steps used, provides especial advantages.
The process according to the present invention can be carried out in a large variety of ways.
The following Examples are given for the purpose of illustrating the present invention:
Example 1
A 1.5 mm. thick steel sheet is degreased by pickling, whereafter one surface thereof is roughened by grinding. A porous, metallic adhesive layer is applied to this pre-treated steel sheet surface in known manner, whereafter a dry, homogeneous sliding material mixture is applied thereto, this mixture com prising, by weight, 37% of crystalline polytetrafluoroethylene, 50% of lead powder and 13% of phenolic resin, the mixture having previously been intensively mixed.The polytetrafluoroethylene used has a particle size of less then 600 pom., the lead powder has a particle size of less than 80 Ism. and the phenolic resin has a particle size of less than 100 ym. The coating is carried out to a thickness of about 2.5 mm. in a sprinkling or raking device.
The coated steel sheet is then subjected to a heat treatment in an oven at 85"C. for 60 minutes in order to achieve a precondensation of the phenolic resin. Subsequently, the sliding material mixture is compressed against the adhesive layer and the steel substrate at an apparatus temperature of about 90"C. and a pressure of from 20 to 40 MPa for 25 seconds. Instead of using a press for the consolidation, there can also be used a calender with heated rollers, the roller diameter being 0.3 metres.
After the consolidation, there is achieved a hardening of the phenolic resin in the sliding material mixture by means of a heat treatment at 145"C. for 25 minutes without the application of pressure. Subsequently, the hardened running layer is post-consolidated at a temperature of 90"C. and at a pressure of from 20 to 40 MPa for 25 seconds. Hereafter, the surface of the applied polytetrafluoroethylenelead-phenolic resin mixture can be ground to a uniform thickness so that th : total thickness of the friction bearing is, for example, 2 mm.
The composite friction bearing material present in planar form can be used as a strip but can also be divided up into any desired shapes or can be rounded to give journal bearing bushings or can be punched out to give thrust washers.
Example 2.
A 0.5 mm. thick steel sheet is pre-treated as in Example 1 and provided with an adhesive layer. The phenolic resin of the friction bearing running layer is dissolved in an appropriate medium, for example in spirit. The two other components, polytetrafluoroethylene and lead, are added to this solution, with vigorous stirring, in the given percentage amounts, optionally with further solvent, so that a slurry-like, pasty mass is formed. This is applied to the adhesive layer in a thickness of about 1.5 mm. by means of a rake device.
Before further working up, the solvent is first evaporated off for severai hours, in dependence upon the thickness of the layer applied and upon the ambient temperature, for example for 5 to 20 hours at ambient temperature. There then follows the further process steps of precondensation, consolidation, hardening and post-consolidation as described in
Example 1. A grinding working up is also carried out so that a composite friction bearing can be produced with an overall thickness of, for example, 1 mm.
The composite friction bearing material according to the present invention is characterised by especially advantageous running properties in maintenance-free operation. Thus, in the case of running experiments with composite friction bearing materials according to the present invention and with friction bearings produced by previously known processes, substantially longer running times are achieved with the materials according to the present invention. In the case of a circumferential speed of 2.4 m/s of a pin against a thrust washer, as well as a specific surface loading of 0.5 MPa, up to a wear of 124 ym. there could be measured, for example, 1 500 to 2500 running hours, whereas, under the same conditions, in the case of the known bearings, only about 250 to 400 running hours were measured.
Claims (10)
1. Process for the production of a composite friction bearing material from a preferably powdered or granular mixture of polytetrafluoroethylene, lead and synthetic resin which is applied to a pre-treated metallic substrate with a porous adhesive layer and with the use of alternating pressures and temperatures for the adhesion in such a manner that, in the final state, over the adhesive layer there is obtained a friction material coating of at least 0.2 mm.
thickness, wherein a) on the adhesive layer connected to the substrate there is first carried out, by means of an appropriate device, a dry coating with a mixture of a sliding material comprising, by weight, 37% of crystalline polytetrafluoroethylene, 50% of lead powder and 13% of phenolic resin, there then follows b) a heat treatment of the coated substrate for pre-condensation of the phenolic resin at about 85"C. for 60 minutes, whereafter c) the coating is pressed with the adhesive layer at a temperature of about 90"C. and a pressure of from 20 to 40 MPa and then, for hardening the phenolic resin, d) there follows a pressureless heat treatment at a temperature of about 145"C. for 25 minutes and, finally, e) the coating is post-compressed against the substrate at a temperature of 90,C. and a pressure of about 20 to 40 MPa.
2. Process according to claim 1, wherein.
in the sliding material mixture, the particle size of the polytetrafluoroethylene is below 600,us., that of the lead powder is below 80 ym. and that of the phenolic resin is below 100 ttm.
3. Process according to claim 1 or 2, wherein the pressing according to step c) and the post-compression according to step e) take place with a chronological pressure action of about 25 seconds.
4. Process according to any of the preceding claims, wherein the substrate is a steel sheet which has been mechanically or chemically roughened on the side to be coated.
5. Process according to claim 4, wherein the roughening is carried out by grinding.
6. Modification of the process according to any of the preceding claims, wherein, alternatively to the coating on of the sliding material according to step a), this is converted into a pasty form by dissolving the phenolic resin in an appropriate solvent and the paste is raked on to the adhesive layer and, prior to the subsequent pre-condensation, the solvent is evaporated off to dryness.
7. Process according to any of the preceding claims, wherein the surface of the friction bearing work material is subjected to a known cutting after-treatment.
8. Process according to claim 7, wherein the cutting after-treatment is carried out by milling.
9. Process according to claim 1 for the production of a composite friction bearing material, substantially as hereinbefore described and exemplified.
10. Composite friction bearing material.
whenever produced by the process according to any of claims 1 to 9.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DD25855783A DD238510A3 (en) | 1983-12-23 | 1983-12-23 | METHOD FOR PRODUCING A COMPOSITE BEARING MATERIAL |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8432149D0 GB8432149D0 (en) | 1985-01-30 |
| GB2153258A true GB2153258A (en) | 1985-08-21 |
| GB2153258B GB2153258B (en) | 1987-04-15 |
Family
ID=5553453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08432149A Expired GB2153258B (en) | 1983-12-23 | 1984-12-20 | Process for the production of a composite friction bearing material |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS60231732A (en) |
| CH (1) | CH666225A5 (en) |
| DD (1) | DD238510A3 (en) |
| DE (1) | DE3444936C2 (en) |
| GB (1) | GB2153258B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2227688A (en) * | 1988-12-17 | 1990-08-08 | Harold Birkett | Improved method for applying protective covering to surfaces |
| GB2393963A (en) * | 2002-09-24 | 2004-04-14 | Daido Metal Co | Slide member composition comprising thermoset, PTFE, bismuth and/or an alkaline earth salt |
| GB2407579A (en) * | 2002-09-24 | 2005-05-04 | Daido Metal Co | Slide member composition comprising thermoset, PTFE and alkaline earth salt |
| US9168726B2 (en) | 2010-09-28 | 2015-10-27 | Saint-Gobain Performance Plastics Corporation | Cast fluoropolymer film for bushings |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3842673A1 (en) * | 1988-12-19 | 1990-06-21 | Atilla Dipl Chem Dr Ing Akyol | Process for producing wear-resistant coats |
| US5913765A (en) * | 1995-03-02 | 1999-06-22 | Kimberly-Clark Worldwide, Inc. | System and method for embossing a pattern on a consumer paper product |
| DE19510054A1 (en) * | 1995-03-20 | 1996-09-26 | Teves Gmbh Alfred | Process for smoothing sliding surfaces on machine components |
| CN112240288A (en) * | 2020-11-02 | 2021-01-19 | 上海亦又新能源科技有限公司 | High-wear-resistance plunger pump crankshaft and long-service-life high-pressure plunger pump |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD61393A (en) * | ||||
| DE1065182B (en) * | 1959-09-10 | The Glacier Metal Company Limited, Alperton, Wembley, Middlesex (Großbritannien) | Storage material and process for its manufacture | |
| US2691814A (en) * | 1952-11-24 | 1954-10-19 | Glacier Co Ltd | Polytetrafluorethylene impregnated bearings |
| GB1025036A (en) * | 1964-07-21 | 1966-04-06 | Wtz Feikeramischen Ind | Process for the production of bearing materials |
-
1983
- 1983-12-23 DD DD25855783A patent/DD238510A3/en not_active IP Right Cessation
-
1984
- 1984-12-08 DE DE19843444936 patent/DE3444936C2/en not_active Expired
- 1984-12-20 GB GB08432149A patent/GB2153258B/en not_active Expired
- 1984-12-21 CH CH616684A patent/CH666225A5/en not_active IP Right Cessation
- 1984-12-24 JP JP27271384A patent/JPS60231732A/en active Granted
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2227688A (en) * | 1988-12-17 | 1990-08-08 | Harold Birkett | Improved method for applying protective covering to surfaces |
| GB2227688B (en) * | 1988-12-17 | 1993-08-18 | Harold Birkett | Improved method for applying protective covering to surfaces |
| GB2393963A (en) * | 2002-09-24 | 2004-04-14 | Daido Metal Co | Slide member composition comprising thermoset, PTFE, bismuth and/or an alkaline earth salt |
| GB2407579A (en) * | 2002-09-24 | 2005-05-04 | Daido Metal Co | Slide member composition comprising thermoset, PTFE and alkaline earth salt |
| GB2393963B (en) * | 2002-09-24 | 2005-07-06 | Daido Metal Co | Sliding composition and sliding member |
| GB2407579B (en) * | 2002-09-24 | 2006-01-11 | Daido Metal Co | Sliding composition and sliding member |
| US9168726B2 (en) | 2010-09-28 | 2015-10-27 | Saint-Gobain Performance Plastics Corporation | Cast fluoropolymer film for bushings |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3444936A1 (en) | 1985-07-11 |
| JPS60231732A (en) | 1985-11-18 |
| GB8432149D0 (en) | 1985-01-30 |
| DE3444936C2 (en) | 1986-12-11 |
| DD238510A3 (en) | 1986-08-27 |
| JPS6250499B2 (en) | 1987-10-26 |
| CH666225A5 (en) | 1988-07-15 |
| GB2153258B (en) | 1987-04-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19951220 |