JP2963577B2 - Method for producing joined body of ceramic member and metal member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a joined body (combined body) of a ceramic member and a metal member, and more particularly to a method of positioning a ceramic member and a metal member by abutting each other. The present invention relates to a method of manufacturing a joined body by brazing.

[0002]

2. Description of the Related Art For example, in a process of brazing a ceramic member and a metal member, both of which are formed in a columnar shape, with their end faces abutting each other, it is important to radially position (align) the two members in terms of accuracy. . The following is known as an example of such positioning. That is, as shown in FIG. 7, for example, a ring (cylindrical) made of Al2 O3 having an inner diameter slightly larger than the outer diameter of a member to be joined (hereinafter also referred to as a work).
The work S is placed inside the positioning jig G
1, S2 is inserted, and positioning is performed by restricting radial displacement on the inner surface thereof.

[0003]

By the way, the ceramic shrinks by about 20% by firing, and the dimensional accuracy after firing is largely varied, and it is difficult to maintain the accuracy as high as the processing accuracy of the metal member. Therefore, the brazing jig and the ceramic member must be designed with a certain margin (gap), and when brazing, the inner surface of the jig G and the metal member S
Even if no gap is formed on the outside (surface) of the ceramic S1, a relatively large gap K is formed on the outer surface of the ceramic S1. For this reason, surplus material in the brazing material R melted between both end surfaces flows out into the gap K. However, since the flowing out brazing material is regulated by the inner surface of the jig G, the ceramic S1 In the direction opposite to the side of the flowed brazing material (in the direction of the arrow) (see FIG. 7). As a result, there is a problem that the axes of the ceramic member S1 and the metal member S2 are misaligned, that is, they are easily joined in a so-called misaligned state, and the accuracy of the joined body is reduced. Further, after firing the ceramic, it is possible to polish the ceramic to a precision comparable to that of a metal member. However, in this case, there are the following problems. That is, the cost is increased by the polishing process. In general, brazing is performed by sandwiching a foil-like brazing material between members and placing a weight on it to raise excess brazing material, and then raising the temperature, but if both ceramic and metal are in close contact with the jig with high accuracy, There is no place where the excess brazing material protrudes, the brazing material thickness after brazing is large, and the strength is reduced. Impurities remain, thereby lowering reliability.

[0004] Recently, such brazing has been carried out using I
Active solder such as n-Cu-Ag-Ti solder is often used, but when the jig is made of Al2 O3, the protruding solder reacts to the jig, so that the jig is only once. It cannot be used, which causes an increase in manufacturing cost.

The present invention has been made in view of these problems in a process of manufacturing a joined body by brazing and joining a ceramic member and a metal member, and it is an object of the present invention to improve a work positioning means. Accordingly, an object of the present invention is to provide a technique capable of improving the joining accuracy and reducing the manufacturing cost of the joined body.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a method of manufacturing a joined body by brazing a ceramic member and a metal member or the like. For a plurality of positioning bodies that are detachably arranged on the positioning jig body for
It is to position by making a contact state, and to join by brazing under it. In this case, it is preferable that the positioning body is disposed so as to be rotatable around its axis. In addition, the positioning member may be configured to straddle the outer edge of the joint surface of the two members to be joined and to contact the members to be joined.

[0007]

With the above arrangement, the workpieces are brought into contact with each other and brought into contact with the plurality of positioning bodies of the positioning jig body. When the butting (joining) surface is heated to a predetermined temperature, the workpiece is interposed there. The melted brazing material is melted, and the excess brazing material flows out from the outer edge of the joining surface. In this case, the brazing material that has flowed out passes through between the positioning members and exits outward. The brazing material that has flowed out is not restricted by the inner surface of the jig as in the conventional technique using a ring-shaped jig. No push to the side. Therefore, it is possible to effectively prevent the workpieces from being joined in a state where the joining surfaces are shifted. Also, if the position (side) of the positioning body that comes into contact with the work is damaged due to wear or the reaction of the brazing material,
Only the damaged one needs to be replaced.

In the case where the positioning body is disposed so as to be rotatable around its axis, the position (side) in contact with the workpiece changes by rotating the positioning body. In joining the next work, the work may be rotated by an appropriate angle so that the undamaged position contacts the work. In other words, according to this technology, the use efficiency of the jig can be improved because one positioning body can be used repeatedly, and even if the entire circumference is damaged and cannot be used, only the positioning body is replaced. Therefore, as compared with the related art in which the entire positioning jig is replaced, the consumption of the jig is significantly reduced, and the manufacturing cost of the joined body is significantly reduced.

Further, in the technique in which the positioning member is in contact with the members to be joined while straddling the outer edge of the joining surface of both members to be joined, the brazing material flowing out from the outer edge of the joining surface adheres to the positioning member. Nothing. Therefore, since the one positioning body can be continuously used as long as it cannot be practically used due to wear, the life of the jig is significantly extended.

[0010]

【Example】

First Embodiment A first embodiment of the present invention will be described in detail with reference to FIGS. However, the joined body S to be manufactured has a ceramic member (Si3 N4) S1 having the same diameter and a short columnar shape, and a metal member (SNCM630) S
2 and the row used is In-Ti-
It is a Cu-Ag-based active raw.

First, the positioning jig 1 used in this embodiment will be described. In this example, the jig main body (base) 2 is formed in a disk shape, and circular holes 3 and 3 having a predetermined inner diameter and depth and having a predetermined inner diameter and depth are formed on the upper surface at the same radius from the center and at equal angular intervals. There are six locations. And these holes 3,3
In this example, shafts (pins) 4 and 4 formed in a columnar shape are inserted (gap-fitted) as positioning members in a predetermined gap. However, in this example, the shafts 4 and 4 are rotatable around the axis 4a in the inserted state, and are disposed so as to be detachable. The diameters of the virtual circles inscribed in the six shafts 4 and 4 provided are the workpieces S1 and S4.
It is set slightly larger than the outer diameter of S2, so that the workpieces S1 and S2 are set to be inscribed in all the shaft bodies 4 and 4 (see FIG. 3). In this specification, the term “contact” means not only a state of physical contact but also a state of almost contact with the naked eye. In this example, both the jig body 2 and the shaft body 4 are made of graphite (carbon).

In this embodiment, a plurality of shafts 4, which are inserted and arranged in respective holes 3, 3 of a jig main body (also referred to simply as a main body) 2, are provided.
The ceramic member S1 is inserted into the inside of the base member 4, and the ceramic member S1 is seated on the upper surface of the main body 2. Then, a predetermined brazing material (not shown) is interposed, and the metal member S2 is inserted to abut the end surface (joining surface) St. Thus, the works S1 and S2 are in a state of being inscribed in the six shafts 4 and 4, and their positions are determined. Thereafter, in accordance with a standard method, a joined body S can be obtained by placing a weight, heating to 800 ° C. in a vacuum, holding for 30 minutes, cooling by replacing with nitrogen gas, and then taking out. In this melting and joining step, excess brazing material flows out from the outer edge So of the joining surface to the outside through the space between the shafts 4 and 4. Therefore, due to the excess brazing material,
The ceramic member S1 is not pushed in the radial direction.

If the side of the shaft body 4 that is in contact with the workpieces S1 and S2 is worn or is damaged by reacting with an active row, the next workpiece is joined and this is indicated by an arrow in FIG. As shown by, it is rotated appropriately so that the side free of such wear or the like comes into contact with the work. If it becomes unusable, remove the shaft and replace it with a new one. In addition,
When the active row is not used, the joint surface of the ceramic member is subjected to a metallizing process in advance. In addition,
2, the intermediate portion of the shaft body 4 is reduced in diameter as shown by a two-dot chain line, a clearance N is provided, and the joint surface St of the workpieces S1 and S2 is formed.
In the case where the shaft body 4 is in contact with the work across the outer edge So, and the brazing is performed under the shaft body 4, the flow-out brazing material does not adhere to the shaft body 4. It is suitable.

In this embodiment, the positioning body is a shaft body. However, as long as it has a positioning portion (point), a positioning piece having an appropriate shape can be used instead of a separate shaft body. The shaft body may be made of a suitable material such as ceramic or metal, but is preferably made of the same material as the main body or of a material having a similar thermal expansion coefficient. Since graphite is excellent in workability and has a coefficient of thermal expansion close to that of ceramics, it can be said that graphite is a suitable material in terms of precision because of a small displacement difference even when the temperature is raised (brazing temperature). In addition, even if the brazing material reacts with graphite, graphite is lower in strength than ceramic, so that damage to the work can be reduced and the occurrence of defects can be effectively reduced.

Preferably, ceramic powder is applied to the surface of the shaft body. By doing so, it is possible to prevent the active law from reacting with the shaft (base) itself, and accordingly, the durability of the shaft is improved accordingly. As an example of the fine powder (ceramic), Al2O
3, Si3 N4, BN and SiO2, but it is preferable to increase the specific surface area as much as possible. Incidentally, when the surface of the shaft was coated with alumina powder having a specific area of about 3 m 2 / g, the consumption of the shaft could be suppressed to less than half.

Second Embodiment Next, a second embodiment will be described with reference to FIG.
In this embodiment, the workpieces S1 and S2 have different diameters from the first embodiment, and the shaft body 14 as the positioning body has a different diameter corresponding thereto. The workpieces S1 and S2 are mounted on the shafts 14,
Only the difference is that the positioning is performed by making the state inscribed in 14, and this is also an application example of the previous example. Therefore, only the differences will be briefly described. That is, in the previous example, since the workpieces are of the same diameter, the shaft body is also made of a column having the same diameter so as to contact both members, but in this example, the workpiece is small and the top is small. Since they have large diameters, the shaft bodies 14 having different diameters set and configured so as to be in contact with each other are disposed.

The shaft as the positioning body may be disposed in contact with the work according to the outer diameter (shape) of the work. Also, the cross-sectional shape is not limited to a circular shape, for example, an appropriate polygon such as a regular octagon,
Alternatively, it may be a polygon having unequal sides. By the way,
When the base of the shaft (fitting portion to the jig main body) has a circular cross section and is rotatable, and a positioning body (a part in contact with the work) having a regular octagon, for example, 45 is arranged. Rotate each time and use repeatedly. Needless to say, the number of shafts may be appropriately set according to the outer diameter and contour of the work, but at least three or more are required.

Third Embodiment A third embodiment will be described with reference to FIG. 5. In this embodiment, the work is the same as that of the first embodiment, and excess brazing material is applied to the joint surface (interface). Although the technique is such that it does not come into contact with the positioning body even if it protrudes from the outer edge, it is common to the technical content shown by the two-dot chain line in FIG. 2 of the first embodiment. Whereas both members (workpieces) are positioned by being in contact with the positioning body, in this example, only one of the workpieces is in contact with the positioning body to perform positioning. . Hereinafter, the differences will be mainly described.

In the positioning jig 21 used in this embodiment, a circular concave portion 25 is formed in the upper center of the main body 22, and one of the members to be joined, that is, the lower half of the ceramic member S1 is inserted with a predetermined gap. (Fitting). As in the case of the above embodiment, a plurality of holes 23 into which shafts 24 described below are inserted are formed around the same radius from the center of the bottom of the recess 25. on the other hand,
In this example, the shaft body 24 is provided with an enlarged portion 24b formed by concentrically increasing the diameter at the upper end of a shaft portion 24a formed in a columnar shape, and is rotatable around its axis. It is detachably provided in each of the holes 23, 23. When the metal member S2 is inserted inside the shaft 24, the metal member S2
And the outer periphery of the enlarged diameter portion 24b are configured to be in contact with each other.

Thus, the shaft members 24, 24 are disposed in the holes 23, 23 of the main body 22, the ceramic member S1 is inserted into the inner concave portion 25, the brazing material is interposed, and the metal member S2 is inserted. The end surfaces St are butted, and as in the case of the first embodiment,
The joined body is manufactured by heating to a predetermined temperature, melting the brazing material, and then cooling it.
5, the lower portion of the ceramic member S1 is inserted therein, the bottom portion of the concave portion 25 is positioned at the inner peripheral surface thereof, and the outer periphery of the metal member S2 placed thereon is in contact with the outer periphery of the enlarged diameter portion 24b of the shaft body. It is positioned as. Therefore, the shaft body 24 is formed on the outer edge S of the joint (boundary) surface St of the workpieces S1 and S2.
o, and is in a state of contacting only one of the workpieces S2, so that the adhesion of the row is prevented.

That is, in the present embodiment, one of the workpieces is positioned by fitting it into the concave portion 25 formed in the jig body 22 itself, and the other workpiece S2 is pivoted with respect to the workpiece S1 whose position is fixed in this way. Positioning and joining are performed by bringing the member into contact with the body 24. In this case, the positioning means of the work S1 is displaced (moved).
Can be prevented and fixed at a predetermined position. Therefore, instead of the concave portion 25, the main body is formed in a disk shape, and the work S
An appropriate number of positioning pieces may be fixed upward to the main body so as to surround the outer periphery of the first.

Fourth Embodiment A fourth embodiment will be described with reference to FIG. 6. However, this embodiment is essentially the same as the previous embodiment, and only the differences will be briefly described. That is, in this example, the joined body S is made of Si3 N
4 Ceramic disc and metal body stem (JIS SNCM
630), wherein a metal body stem portion, which is a metal member S2, is inserted from above into a through hole 35 provided in the center of the upper end surface of a graphite jig body 32. The inner circumference of the hole 35 is concentric, and the centering position is determined by suspending the tapered surface at the upper edge of the opening.
The ceramic member S1 is inserted into the shaft members 34, 34 disposed in the member 33 in a state where the ceramic member S1 is in contact with the shaft members 34 and 34, and the two members are butted together. This shows the manufacturing technology. In the previous example, the metal member was positioned so as to be in contact with the shaft, but in this example, the ceramic member S1 was in a state in contact with the shaft. Since the row is easily wetted to the metal member S2 side, the adhesion to the shaft body is more effectively prevented.

In each of the above embodiments, the fitting portion (base portion) for the holes 3, 13, 23, 33 of the main body has a circular cross section so that the positioning body (shaft body) can rotate continuously around its axis. However, they may be arranged so that they can be rotated discontinuously by a predetermined angle. For example, the shape of the hole in a plan view (cross section) may be a regular octagon, and the positioning body may be a shaft body having a regular octagonal fitting portion (base) that fits in the hole without any gap and that can be detachably fitted. In this case, it is taken out, rotated once by 45 degrees, and inserted (fitted) into the hole.

The method of the present invention can be widely applied to the production of a joined body formed by brazing ceramic and metal, such as engine parts such as rocker arms and tappets, electronic parts, and tools. Further, the present invention can be applied to a hollow work such as a cylindrical shape and also to a non-circular work.

[0025]

As is apparent from the above description, according to the present invention, even if the brazing material interposed between the joining surfaces of the two members to be joined is melted and flows out from the outer edge of the joining surface, the positioning members are not separated from each other. As a result, the ceramic member having a small coefficient of thermal expansion is not pushed to one side in the brazing process as in the conventional technique using a ring-shaped jig. Therefore, it is possible to effectively prevent joining in a state where the joining surfaces are shifted, and as a result, the joining accuracy of the joined body is improved. Further, even if the positioning body is damaged by abrasion or a reaction due to the brazing material, it is sufficient to replace only the positioning body, so that the manufacturing cost can be reduced as compared with the related art in which the entire jig is replaced.

In the technique in which the positioning body is rotatable around the axis, the jig can be used repeatedly by rotating the positioning body at an appropriate angle, thereby improving the use efficiency of the jig. Therefore, the cost of the jig and the manufacturing cost of the joined body are further reduced as compared with the related art.

Further, in the technique in which the positioning member straddles the outer edge of the joining surface of the work and contacts the positioning member, the excessive brazing material flowing out from the outer edge of the joining surface is prevented from adhering to the positioning member. The life of the jig is significantly extended.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a first embodiment of the method of the present invention, showing a positioning jig embodying a work positioning technique in the embodiment, and a perspective view showing a state where the work is set and positioned on the jig. FIG.

FIG. 2 is a partial vertical sectional view showing a shaft body in FIG. 1;

FIG. 3 is a plan view of FIG. 1;

FIG. 4 is an explanatory view of a second embodiment of the method of the present invention, showing a positioning jig embodying a work positioning technique in the embodiment, and a broken state showing a state where the work is set and positioned on the jig. It is sectional drawing.

FIG. 5 is an explanatory view of a third embodiment of the method of the present invention, showing a positioning jig embodying a work positioning technique in the embodiment, and a broken state showing a state where the work is set and positioned on the positioning jig. It is sectional drawing.

FIG. 6 is an explanatory view of a fourth embodiment of the method of the present invention, showing a positioning jig embodying a work positioning technique in the embodiment, and a broken state showing a state where the work is set and positioned on the jig. It is sectional drawing.

FIG. 7 is a sectional view and a partially enlarged view showing a state where a work is positioned using a conventional positioning jig and brazing is performed under the work.

[Explanation of symbols]

 2, 12, 22, 32 ... positioning jig body 4, 14, 24, 34 ... shaft body (positioning body) 4a ... axis S ... bonded body S1 ... ceramic member (work) S2 ... metal member (work) St ... bonding Surface So ... outer edge

Claims (3)

(57) [Claims] In producing a joined body by brazing a ceramic member and a metal member to each other, the member to be joined is provided so as to be detachable from a positioning jig body for positioning the member. For multiple positioning bodies,
A method for manufacturing a joined body of a ceramic member and a metal member, the method comprising positioning by bringing into contact with each other, and brazing under the position. 2. The method for manufacturing a joined body of a ceramic member and a metal member according to claim 1, wherein the positioning body is disposed so as to be rotatable around its axis. 3. The joined body of a ceramic member and a metal member according to claim 1 or 2, wherein the positioning body straddles an outer edge of a joining surface of both members to be joined and comes into contact with the joined member. Production method.