GB732618A - A method for the manufacture of metal articles by sintering at low temperatures - Google Patents
A method for the manufacture of metal articles by sintering at low temperaturesInfo
- Publication number
- GB732618A GB732618A GB19353/53A GB1935353A GB732618A GB 732618 A GB732618 A GB 732618A GB 19353/53 A GB19353/53 A GB 19353/53A GB 1935353 A GB1935353 A GB 1935353A GB 732618 A GB732618 A GB 732618A
- Authority
- GB
- United Kingdom
- Prior art keywords
- powder
- per cent
- oxide
- temperature
- metal
- 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
-
- 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
- B22F3/12—Both compacting and sintering
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Abstract
732,618. Powder metallurgy. AGTE, C. July 13, 1953 [July 25, 1952], No. 19353/53. Class 83 (4). For producing articles by powder metallurgy at comparatively low sintering temperatures, the initial metal powder comprises 60-90 per cent of grains of size 0.2-1.0 micron and 40- 10 per cent of a size 2-5 microns and is compacted at 2-10 tons per square cm. and sintered in dry hydrogen at a temperature which, measured in degrees absolute, is between 0.2 and 0.55 of the melting-point of the metal. The powder is preferably obtained by the reduction of a salt or oxide of a metal in hydrogen and after a second reduction treatment at a higher temperature is ground for at least 40 hours in an organic liquid such as carbon tetrachloride, trichlorethylene, benzene, acetone &c. to which is added 0.5-3 per cent of an aliphatic acid or its ester. In an example, molybdenum oxide is reduced in dry hydrogen at a final temperature of 820-850‹ C. and cooled in carbon dioxide. The resulting molybdenum powder is sifted through a screen of 0.06 mm. mesh, given a further reducing treatment in dry hydrogen at about 800‹C. and ground for 72 hours in tetrachlormethane to which 0.5-3 per cent stearine is added. The powder is then compacted at 2-10 tons per square cm. and the compacts packed in a protective material such as powdered aluminium oxide or beryllium oxide on which a thin layer of fine-grained ferrotitanium is poured to act as a getter and so prevent access of oxygen. The sintering temperature is 900-1250‹ C. For other metals the sintering temperatures would be tungsten 1000‹- 1400‹ C., iron 550-850‹ C., cobalt 650- 800‹ C., nickel 600-850‹ C. and copper 400- 580‹ C.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CS732618X | 1952-07-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB732618A true GB732618A (en) | 1955-06-29 |
Family
ID=5455209
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB19353/53A Expired GB732618A (en) | 1952-07-25 | 1953-07-13 | A method for the manufacture of metal articles by sintering at low temperatures |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB732618A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3051566A (en) * | 1959-01-20 | 1962-08-28 | Gen Electric | Process for producing high density refractory bodies |
-
1953
- 1953-07-13 GB GB19353/53A patent/GB732618A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3051566A (en) * | 1959-01-20 | 1962-08-28 | Gen Electric | Process for producing high density refractory bodies |
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