GB303751A - Improvements in and relating to hard metal compositions - Google Patents
Improvements in and relating to hard metal compositionsInfo
- Publication number
- GB303751A GB303751A GB536/29A GB53629A GB303751A GB 303751 A GB303751 A GB 303751A GB 536/29 A GB536/29 A GB 536/29A GB 53629 A GB53629 A GB 53629A GB 303751 A GB303751 A GB 303751A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cobalt
- carbon
- tungsten
- mixture
- per cent
- 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
Abstract
303,751. British Thomson-Houston Co., Ltd.., (Assignees of Kelley, F. C.). Jan. 7, 1928, [Convention date]. Metals, powdered, obtaining coherent masses from; alloys.-A method of forming a hard composition suitable for metal cutting tools and dies comprises heating to sintering temperature a temporarily bound mixture of powdered materials, particularly a mixture of a refractory metal, a metal of the iron group, and carbon, for example tungsten, cobalt, and carbon. Magnet or tool steels containing for example cobalt and chromium, or cobalt and molybdenum, or cobalt, tungsten and chromium may be similarly made. A mixture consisting of tungsten, 5-25 per cent of cobalt, and 3-10 per cent of carbon may be mixed with about 2 per cent of a binder which may be gum tragacanth or an alkyl resin such as that described in Specification 3271/13, [Class 95, Paints &c.], moistened with acetone, pressed, heated in hydrogen in graphite tubes slowly to 100-150‹ C. to harden the resin, then slowly to 350‹ C. for about 1 ¢ hours. Specifications 288,521 and 289,477 also are referred to. The Specification as open to inspection under Sect. 91 (3) (a) states also that a temporary binder may be dispensed with and a mixture of tungsten, cobalt, and carbon fritted under pressure in a carbon mould at about 850‹ C., the material being afterwards heated to 1,375‹ C. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US303751XA | 1928-01-07 | 1928-01-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB303751A true GB303751A (en) | 1930-02-13 |
Family
ID=21853920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB536/29A Expired GB303751A (en) | 1928-01-07 | 1929-01-07 | Improvements in and relating to hard metal compositions |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB303751A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0091013A1 (en) * | 1982-04-05 | 1983-10-12 | GTE Products Corporation | Process for producing refractory powder |
-
1929
- 1929-01-07 GB GB536/29A patent/GB303751A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0091013A1 (en) * | 1982-04-05 | 1983-10-12 | GTE Products Corporation | Process for producing refractory powder |
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