GB635221A - Process for producing carbides of tungsten and/or of molybdenum and their sintered alloys - Google Patents
Process for producing carbides of tungsten and/or of molybdenum and their sintered alloysInfo
- Publication number
- GB635221A GB635221A GB25927/46A GB2592746A GB635221A GB 635221 A GB635221 A GB 635221A GB 25927/46 A GB25927/46 A GB 25927/46A GB 2592746 A GB2592746 A GB 2592746A GB 635221 A GB635221 A GB 635221A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tungsten
- molybdenum
- nitride
- sintered alloys
- cobalt
- 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
Links
Classifications
-
- 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
- C22C1/05—Mixtures of metal powder with non-metallic powder
- C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
- C22C1/053—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor with in situ formation of hard compounds
- C22C1/055—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor with in situ formation of hard compounds using carbon
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Ceramic Products (AREA)
- Powder Metallurgy (AREA)
Abstract
A process for preparing sintered alloys of carbides of tungsten and/or molybdenum consists in preparing pulverulent nitride of tungsten and/or molybdenum, carburising the nitride with release of nitrogen, adding a powdered metal or alloy to serve as a binder, and sintering. The nitride may be prepared by treating pulverized oxide of tungsten and/or molybdenum at a temperature between 450 DEG and 800 DEG C with a current of anhydrous ammonia. The carburisation may be effected by treating the nitride, mixed with the requisite quantity of finely-divided pure carbon, at 1200 DEG -1500 DEG C in a current of dry hydrogen or other reducing atmosphere, in a neutral atmosphere, or in vacuo. The binding metal or alloy, e.g., cobalt or cobalt-iron, may be added in the metallic form, or in the form of oxide which is reduced during the treatment with ammonia.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR635221X | 1941-08-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB635221A true GB635221A (en) | 1950-04-05 |
Family
ID=8994153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB25927/46A Expired GB635221A (en) | 1941-08-04 | 1946-08-29 | Process for producing carbides of tungsten and/or of molybdenum and their sintered alloys |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB635221A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4639352A (en) * | 1985-05-29 | 1987-01-27 | Sumitomo Electric Industries, Ltd. | Hard alloy containing molybdenum |
-
1946
- 1946-08-29 GB GB25927/46A patent/GB635221A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4639352A (en) * | 1985-05-29 | 1987-01-27 | Sumitomo Electric Industries, Ltd. | Hard alloy containing molybdenum |
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