Deprecated: The each() function is deprecated. This message will be suppressed on further calls in /home/zhenxiangba/zhenxiangba.com/public_html/phproxy-improved-master/index.php on line 456
EP0183017B2 - Procédé de frittage de poudres de tungstène préalliées - Google Patents
[go: Go Back, main page]

EP0183017B2 - Procédé de frittage de poudres de tungstène préalliées - Google Patents

Procédé de frittage de poudres de tungstène préalliées Download PDF

Info

Publication number
EP0183017B2
EP0183017B2 EP85112578A EP85112578A EP0183017B2 EP 0183017 B2 EP0183017 B2 EP 0183017B2 EP 85112578 A EP85112578 A EP 85112578A EP 85112578 A EP85112578 A EP 85112578A EP 0183017 B2 EP0183017 B2 EP 0183017B2
Authority
EP
European Patent Office
Prior art keywords
tungsten
sintering
phase
heat treatment
liquid phase
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.)
Expired - Lifetime
Application number
EP85112578A
Other languages
German (de)
English (en)
Other versions
EP0183017B1 (fr
EP0183017A1 (fr
Inventor
Rainer Dr. Dipl.-Phys. Schmidberger
Sylvia Dipl.-Ing. Härdtle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dornier System GmbH
Original Assignee
Dornier System GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Dornier System GmbH filed Critical Dornier System GmbH
Priority to AT85112578T priority Critical patent/ATE36481T1/de
Publication of EP0183017A1 publication Critical patent/EP0183017A1/fr
Application granted granted Critical
Publication of EP0183017B1 publication Critical patent/EP0183017B1/fr
Publication of EP0183017B2 publication Critical patent/EP0183017B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
    • F42B12/04—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of armour-piercing type
    • F42B12/06—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of armour-piercing type with hard or heavy core; Kinetic energy penetrators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/045—Alloys based on refractory metals

Definitions

  • the invention relates to a sintering process for pre-alloyed tungsten powder according to the preamble of claim 1.
  • Tungsten alloy powders are known from EP98 944, which are already pre-alloyed, whereby the tungsten grains are already covered by the binder phase. Pellets from this powder are compacted by solid phase sintering.
  • the sintered parts are characterized by a polygonal structure of the tungsten phase. The structure is much finer than that of conventional heavy tungsten metals, which were produced from the individual powders (W, Ni, Fe) by mixing, pressing and sintering in the liquid phase.
  • the polygonal structure shows a high consistency of the tungsten phase (contiguity). This means that a multitude of tungsten-tungsten grain boundaries exist that can degrade the mechanical properties of the sintered tungsten heavy metals.
  • the tensile strength and elongation at break deteriorate particularly when interstitial impurities such as oxygen, phosphorus, sulfur and other constituents which are sparingly soluble in tungsten are contained in the alloy. They separate out on the tungsten grain boundaries and cause the grain boundary embrittlement characteristic of pure tungsten.
  • the invention has for its object to provide a sintering process with which a sintered body with a high proportion of tungsten with a fine-grained structure (less than 10 .mu.m of the tungsten phase) has a low contiguity of the tungsten phase.
  • the heat treatment according to the invention in the liquid phase leads to the previously polygonal tungsten grains being rounded off by dissolving in the molten binder phase, without at the same time noticeable grain growth occurring. This results in an approximately spherical shape of the tungsten grains, which reduces the harmful continuity of the tungsten phase, since spheres have less contact area with one another than polygons.
  • Fine grain is required because of the resulting increase in strength (increase in the yield strength according to Hall-Petch relationship a s - 1W where a indicates the average grain size.
  • the duration of the heat treatment with the liquid phase is 2 to 10 minutes. After this time, the tungsten grains are largely rounded. Since the sintered body is already densely sintered when the liquid phase occurs (residual porosity - 1%) and the tungsten phase is relatively uniform, the segregation of tungsten and binder phases that occurs during the usual liquid phase internals will not take place.
  • Solid phase interinterpretation can also be carried out partially in vacuo. If this is not followed by any further sintering under a hydrogen atmosphere, a separate vacuum annealing to remove the hydrogen dissolved in the sintered part can be omitted.
  • the heat treatment with liquid phase can be carried out immediately after the solid phase sintering or only after vacuum annealing.
  • the atmosphere present can be both hydrogen and inert gas. However, the heat treatment can also be carried out in a high vacuum.
  • the cooling rate should not be more than 3 K / min near the solidification temperature.
  • the toughness of the sintered parts is increased by the method according to the invention.
  • the elongation at break increases due to the structural transformation without a significant decrease in strength e.g. from 15% to 40%.
  • the strength and elongation properties of the sintered parts can be changed within wide limits by adjusting the tungsten grain size via the dwell time in the liquid phase during the structural transformation.
  • FIG. 2 shows a workpiece that has been subjected to the treatment according to the invention.
  • Fig. 1 shows the metallographic section of a solid-phase sintered tungsten heavy metal with 90% tungsten.
  • Fig. 1 shows the polygonal structure of the tungsten grains, which creates a considerable contiguity of the tungsten phase.
  • Fig. 2 shows a micrograph of a tungsten heavy metal after heat treatment with liquid phase.
  • the tungsten grains are insignificantly larger than in the solid-phase sintered state. Due to their wrestling, however, the contiguity is significantly lower.
  • An alloyed tungsten heavy metal powder with the composition 90% W, 6% Ni, Co, 2% Fe is compressed with a pressure of 300 N / mm 2 .
  • the compact is sintered in flowing hydrogen at 1 300 ° C for 5 hours and then in a vacuum of 10- 5 mbar at 1050 ° C degassed for 6 hours.
  • the sintered part is then heat-treated in a vacuum at 1,470 ° C. for 5 minutes and then rapidly cooled.
  • the tensile strength of the sample is 1 150 N / mm 2 with an elongation at break of 30%.
  • a tungsten heavy metal powder as in Example 1 is compressed with a pressure of 300 N / mm 2 .
  • the compact is presintered in flowing hydrogen at 900 ° C for 10 hours and then sintered in vacuo at 1,360 ° C for 20 hours.
  • a heat treatment of the sintered part is then carried out in vacuo at 1,470 ° C. for 10 minutes.
  • the tensile strength of the sample is 1 100 N / mm 2 with an elongation at break of 40%.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)

Claims (5)

1. Sinterverfahren für vorlegierte Wolframpulver, deren Wolframkörner bereits von einer Binderphase umhüllt sind, wobei ein poröses Formteil aus verdichtetem Pulver in fester Phase gesintert wird, dadurch gekennzeichnet, daß sich an das Sintern eine kurze Wärmebehandlung von 2 bis 10 Minuten mit flüssiger Phase anschließt, die so lange durchgeführt wird, bis alle Wolframkörner abgerundet sind und ein feinkörniges Gefüge mit kleiner 10 pm der Wolframphase erreicht wird, und daß die Wärmebehandlung mit flüssiger Phase begonnen wird, wenn der Pressling durch die vorausgegangene Festphasensinterung auf weniger als 1 % Porosität kompaktiert ist.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß in strömendem Wasserstoff gesintert wird und die Wärmebehandlung im Hochvakuum ≤10-5 mbar erfolgt.
3. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß vor der Wärmebehandlung durch Halten auf Sintertemperatur im Hochvakuum bei einem Druck unterhalb von 10-5 mbar entgast wird.
4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß am Ende mit ca. 100 K/min abgekühlt wird.
5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß eine Legierung aus 90 bis 97% W, Rest Ni:Fe:Co im Gewichtsverhältnis 3:1:1,5 h in strömendem Wasserstoff bei 1,300°C gesintert, bei 1.300°C im Hochvakuum ≤10-5 mbar 0,5 h lang entgast, bei 1.470°C im Hochvakuum für 5 min einer Wärmebehandlung unterzogen und schließlich auf Raumtemperatur abgekühlt wird.
EP85112578A 1984-10-20 1985-10-04 Procédé de frittage de poudres de tungstène préalliées Expired - Lifetime EP0183017B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85112578T ATE36481T1 (de) 1984-10-20 1985-10-04 Sinterverfahren fuer vorlegierte wolframpulver.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3438547A DE3438547C2 (de) 1984-10-20 1984-10-20 Wärmebehandlungsverfahren für vorlegierte, zweiphasige Wolframpulver
DE3438547 1984-10-20

Publications (3)

Publication Number Publication Date
EP0183017A1 EP0183017A1 (fr) 1986-06-04
EP0183017B1 EP0183017B1 (fr) 1988-08-17
EP0183017B2 true EP0183017B2 (fr) 1991-01-09

Family

ID=6248414

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85112578A Expired - Lifetime EP0183017B2 (fr) 1984-10-20 1985-10-04 Procédé de frittage de poudres de tungstène préalliées

Country Status (5)

Country Link
US (1) US4698096A (fr)
EP (1) EP0183017B2 (fr)
JP (1) JPS61104002A (fr)
AT (1) ATE36481T1 (fr)
DE (2) DE3438547C2 (fr)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8403031A (nl) * 1984-10-05 1986-05-01 Philips Nv Werkwijze voor het vervaardigen van een scandaatnaleveringskathode en scandaatnaleveringskathode vervaardigd volgens deze werkwijze.
JP2552264B2 (ja) * 1986-02-12 1996-11-06 三菱マテリアル株式会社 高靱性を有するｗ基合金焼結体の製造法
JP2531623B2 (ja) * 1986-02-12 1996-09-04 三菱マテリアル株式会社 高靱性を有するｗ基焼結合金製飛翔体の製造方法
FR2617192B1 (fr) * 1987-06-23 1989-10-20 Cime Bocuze Procede pour reduire la dispersion des valeurs des caracteristiques mecaniques d'alliages de tungstene-nickel-fer
US4762559A (en) * 1987-07-30 1988-08-09 Teledyne Industries, Incorporated High density tungsten-nickel-iron-cobalt alloys having improved hardness and method for making same
US4744944A (en) * 1987-08-05 1988-05-17 Gte Products Corporation Process for producing tungsten heavy alloy billets
US5008071A (en) * 1988-01-04 1991-04-16 Gte Products Corporation Method for producing improved tungsten nickel iron alloys
US4777015A (en) * 1988-01-14 1988-10-11 Gte Products Corporation Process for producing tungsten heavy alloy sheet using a metallic salt binder system
US4800064A (en) * 1988-01-14 1989-01-24 Gte Products Corporation Process for producing tungsten heavy alloy sheet using hydrometallurgically produced tungsten heavy alloy
US4793969A (en) * 1988-01-14 1988-12-27 Gte Products Corporation Process for producing tungsten heavy alloy sheet using high temperature processing techniques
FR2633205B1 (fr) * 1988-06-22 1992-04-30 Cime Bocuze Procede de mise en forme directe et d'optimisation des caracteristiques mecaniques de projectiles perforants en alliage de tungstene a haute densite
DE3821474C1 (de) * 1988-06-25 1998-08-27 Nwm De Kruithoorn Bv Unterkalibriges, drallstabilisiertes Mehrzweckgeschoß
US5603073A (en) * 1991-04-16 1997-02-11 Southwest Research Institute Heavy alloy based on tungsten-nickel-manganese
DE4113177C2 (de) * 1991-04-23 1993-10-21 Nwm De Kruithoorn Bv Verfahren zur Herstellung eines Penetrators
US5610347A (en) * 1992-06-10 1997-03-11 Doduco Gmbh & Co. Dr. Eugen Durrwachter Material for electric contacts taking silver-tin oxide or silver-zinc oxide as basis
US5821441A (en) * 1993-10-08 1998-10-13 Sumitomo Electric Industries, Ltd. Tough and corrosion-resistant tungsten based sintered alloy and method of preparing the same
JP3052240B2 (ja) * 1998-02-27 2000-06-12 東京タングステン株式会社 Ｘ線管用回転陽極及びその製造方法
FR2830022B1 (fr) 2001-09-26 2004-08-27 Cime Bocuze Alliage base tungstene fritte a haute puissance
TW201730360A (zh) * 2015-10-27 2017-09-01 塔沙Ｓｍｄ公司 具有改良特性之低電阻率鎢膜及鎢靶材

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2225980A5 (fr) * 1969-10-28 1974-11-08 Onera (Off Nat Aerospatiale)
GB1333147A (en) * 1971-01-05 1973-10-10 Gen Electric Co Ltd Dense alloys
US3958316A (en) * 1971-01-25 1976-05-25 P. R. Mallory & Co., Inc. Liquid phase-sintered molybdenum base alloys having additives and shaping members made therefrom
US3888636A (en) * 1971-02-01 1975-06-10 Us Health High density, high ductility, high strength tungsten-nickel-iron alloy & process of making therefor
US3988118A (en) * 1973-05-21 1976-10-26 P. R. Mallory & Co., Inc. Tungsten-nickel-iron-molybdenum alloys
US4090875A (en) * 1973-10-01 1978-05-23 The United States Of America As Represented By The Department Of Energy Ductile tungsten-nickel-alloy and method for manufacturing same
US3979209A (en) * 1975-02-18 1976-09-07 The United States Of America As Represented By The United States Energy Research And Development Administration Ductile tungsten-nickel alloy and method for making same
US3979234A (en) * 1975-09-18 1976-09-07 The United States Of America As Represented By The United States Energy Research And Development Administration Process for fabricating articles of tungsten-nickel-iron alloy
AT377784B (de) * 1980-02-20 1985-04-25 Inst Khim Fiz An Sssr Wolframfreie hartlegierung und verfahren fuer ihre herstellung
DE3226648C2 (de) * 1982-07-16 1984-12-06 Dornier System Gmbh, 7990 Friedrichshafen Heterogenes Wolfram-Legierungspulver
FR2546836B1 (fr) * 1983-06-03 1986-03-21 Pomagalski Sa Station de telepherique

Also Published As

Publication number Publication date
US4698096A (en) 1987-10-06
EP0183017B1 (fr) 1988-08-17
DE3564391D1 (en) 1988-09-22
DE3438547C2 (de) 1986-10-02
ATE36481T1 (de) 1988-09-15
EP0183017A1 (fr) 1986-06-04
JPS61104002A (ja) 1986-05-22
DE3438547A1 (de) 1986-04-30

Similar Documents

Publication Publication Date Title
EP0183017B2 (fr) Procédé de frittage de poudres de tungstène préalliées
DE69622798T2 (de) Seltenerd Dauermagnet und dessen Herstellungsverfahren
DE69032065T2 (de) Verbundwerkstoff von Silber und Metalloxyd und Verfahren zur Herstellung desselben
DE3884887T2 (de) Schwermetallegierungen aus Wolfram-Nickel-Eisen-Kobalt mit hoher Härte und Verfahren zur Herstellung dieser Legierungen.
DE69030366T2 (de) Aluminiumlegierungspulver, gesinterte Aluminiumlegierung sowie Verfahren zur Herstellung dieser gesinterten Legierung
DE69223194T2 (de) Verfahren zur Herstellung von Verbundlegierungspulver mit Aluminiummatrix
DE2625212C2 (de) Pulvermischung zur Herstellung von Sinterkörpern
EP2600996B1 (fr) Procédé de fabrication selon la technique de la métallurgie des poudres d'un matériau cu-cr
DE2706214C2 (de) Magnetlegierung auf Eisen-Chrom- Kobalt-Basis mit spinodaler Entmischung
DE69126571T2 (de) Elektrisches Kontaktmaterial
DE3881979T2 (de) Legiertes Stahlpulver für Pulvermetallurgische Verfahren.
WO2005028692A1 (fr) Alliage ods molybdene-silicium-bore
DE2815159C2 (de) Verfahren zur Herstellung gesinterter Preßlinge aus Legierungen auf Aluminiumbasis
DE2542094A1 (de) Metallpulver, verfahren zur behandlung losen metallpulvers und verfahren zur herstellung eines verdichteten presslings
DE19950595C1 (de) Verfahren zur Herstellung von Sinterteilen aus einer Aluminiumsintermischung
DE3729033A1 (de) Verfahren zur herstellung von vakuumschalter-elektroden
DE69207257T2 (de) Wärmebeständige gesinterte Oxiddispersionsgehärtete Legierung
DE1125459C2 (de) Verfahren zum Erzeugen von legiertem Pulver auf Eisenbasis fuer pulvermetallurgische Zwecke
DE602005001248T2 (de) Verfahren zur Reduzierung des Sauerstoffgehalts eines Pulvers und das daraus hergestellte Produkt.
DE4019305C2 (de) Pulver und Produkte aus Tantal, Niob und deren Legierungen
DE3700659A1 (de) Feinkoerniger versproedungsfester tantaldraht
DE60025117T2 (de) Legierung für elektrische Kontakte und Elektroden und Verfahren seiner Herstellung
DE2613255A1 (de) Hochfeste eisen-molybdaen-nickel- sinterlegierung mit phosphorzusatz
DE2049546B2 (de) Verfahren zur pulvermetallurgischen Herstellung eines dispersionsverfestigten Legierungskörpers
DE69422981T2 (de) Duktile, leiche, hochfeste beryllium-aluminium kompositgusslegierung

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19860320

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE FR GB IT LI NL SE

17Q First examination report despatched

Effective date: 19870819

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB IT LI NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19880817

Ref country code: NL

Effective date: 19880817

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 19880817

Ref country code: BE

Effective date: 19880817

REF Corresponds to:

Ref document number: 36481

Country of ref document: AT

Date of ref document: 19880915

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3564391

Country of ref document: DE

Date of ref document: 19880922

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19881004

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19881031

Ref country code: CH

Effective date: 19881031

ET Fr: translation filed
NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

PLAB Opposition data, opponent's data or that of the opponent's representative modified

Free format text: ORIGINAL CODE: 0009299OPPO

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

26 Opposition filed

Opponent name: METALLWERK PLANSEE GMBH

Effective date: 19890511

R26 Opposition filed (corrected)

Opponent name: METALLWERK PLANSEE GMBH

Effective date: 19890511

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732

PUAH Patent maintained in amended form

Free format text: ORIGINAL CODE: 0009272

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT MAINTAINED AS AMENDED

27A Patent maintained in amended form

Effective date: 19910109

AK Designated contracting states

Kind code of ref document: B2

Designated state(s): AT BE CH DE FR GB IT LI NL SE

GBTA Gb: translation of amended ep patent filed (gb section 77(6)(b)/1977)
ET3 Fr: translation filed ** decision concerning opposition
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19940909

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19940916

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19941212

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19951004

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19951004

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19960628

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19960702

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST