GB676437A - Improvements in or relating to a process for removing superficial oxide coatings from metal particles - Google Patents
Improvements in or relating to a process for removing superficial oxide coatings from metal particlesInfo
- Publication number
- GB676437A GB676437A GB18253/49A GB1825349A GB676437A GB 676437 A GB676437 A GB 676437A GB 18253/49 A GB18253/49 A GB 18253/49A GB 1825349 A GB1825349 A GB 1825349A GB 676437 A GB676437 A GB 676437A
- Authority
- GB
- United Kingdom
- Prior art keywords
- heating
- case
- oxide coatings
- substance
- volatile substance
- 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
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
-
- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/14—Treatment of metallic powder
- B22F1/145—Chemical treatment, e.g. passivation or decarburisation
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
Metal powders are cleaned of superficial oxide coatings by heating the powder in a reducing atmosphere together with a small proportion of high boiling point completely volatile substance which is chemically stable under the conditions of heating, so that the substance distils off during the reduction process to prevent sintering of the powder. 0.3 to 2 per cent of a hydro-carbon, such as mineral oil, polybutene or paraffin may be used as the volatile substance and the reducing atmosphere may be pure hydrogen, dissociated ammonia or cracked illuminating gas. Heating may be effected at 350-650 DEG C in the case of copper, at 700-850 DEG C in the case of iron, and at 400 DEG C in the case of copper-lead powders. The process may be a batch or a continuous process and when the volatile substance is a solid or viscous liquid, it may be diluted or dissolved in a volatile solvent.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US676437XA | 1948-07-13 | 1948-07-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB676437A true GB676437A (en) | 1952-07-30 |
Family
ID=22077399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB18253/49A Expired GB676437A (en) | 1948-07-13 | 1949-07-11 | Improvements in or relating to a process for removing superficial oxide coatings from metal particles |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB676437A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3053649A (en) * | 1957-04-02 | 1962-09-11 | Onera (Off Nat Aerospatiale) | Methods for the obtainment of articles of chromium or containing chromium and in articles obtained by these methods |
-
1949
- 1949-07-11 GB GB18253/49A patent/GB676437A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3053649A (en) * | 1957-04-02 | 1962-09-11 | Onera (Off Nat Aerospatiale) | Methods for the obtainment of articles of chromium or containing chromium and in articles obtained by these methods |
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