US3232753A - Method of forming an aluminum article - Google Patents

Method of forming an aluminum article Download PDF

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Publication number
US3232753A
US3232753A US182952A US18295262A US3232753A US 3232753 A US3232753 A US 3232753A US 182952 A US182952 A US 182952A US 18295262 A US18295262 A US 18295262A US 3232753 A US3232753 A US 3232753A
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United States
Prior art keywords
aluminum
powder
forming
metal
article
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Expired - Lifetime
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US182952A
Inventor
Pierre Philippe D S St
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General Electric Co
Original Assignee
General Electric Co
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Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Priority to US182952A priority Critical patent/US3232753A/en
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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
    • C22C1/0408—Light metal alloys
    • C22C1/0416—Aluminium-based alloys
    • 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
    • B22F1/17—Metallic particles coated with metal
    • 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
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • 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
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/16—Making metallic powder or suspensions thereof using chemical processes
    • B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
    • B22F9/24—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions

Description

United States Patent METHOD OF FORIVHNG AN ALUMINUM ARTICLE Philippe D. S. St. Pierre, Schenectady, N.Y., assignor to General Electric Company, a corporation of New York No Drawing. Original application Apr. 8, 1958, Ser. No. 727,053. Divided and this application Mar. 27, 1962,
Ser. No. 182,952
3 Claims. (Cl. 75212) This invention relates to a method of forming aluminum articles and more particularly to a method of forming aluminum articles by powder metallurgy processes.
This application is a division of my co-pending application filed April 8, 1958, as Serial Number 727,053, now abandoned.
While it would be desirable to form aluminum articles, which are used extensively, from aluminum powder by compacting and sintering the powder, such powder will not sinter in a satisfactory manner. The particles of the aluminum powder are covered with aluminum oxide when the powder is formed in contact with air and this results in an unsatisfactory sintered article.
It is an object of my invention to provide a method of forming an aluminum article from aluminum powder.
It is a further object of my invention to provide a method of forming an aluminum article from aluminum powder wherein the aluminum oxide coating on the powder particles is eliminated and a plating metal is deposited on these particles.
In carrying out my invention in one form, a method of forming an aluminum article comprises providing aluminum powder, removing the oxide coating from the aluminum powder in the presence of a dilute solution of a more noble metal, coating the metal on the aluminum powder from said dilute solution, compacting said coated powder, and sintering said coated powder in a non-oxidizing atmosphere such as a neutral or reducing atmosphere.
These and various other objects, features and advantages of the invention will be better understood from the following description.
Aluminum powder is not normally compacted and sintered to produce an article since the oxide film on the powder particles creates a serious difficulty in the sintering step resulting in an unsatisfactory product. The present invention relates to a method of forming an aluminum article from aluminum powder. When aluminum powder is formed or milled from aluminum metal in contact with air, the aluminum oxide coating is removed from the aluminum but reforms instantly on the powder particles. I discovered that when the aluminum powder is formed from aluminum metal with the removal of the oxide therefrom, reformation of surface oxide can be eliminated by milling the powder in the presence of a dilute solution of a more noble plating metal. The plating metal deposits on the surface of the aluminum powder particles eliminating any further oxidation of the powder which would occur subsequent to its formation. The coated aluminum powder is compacted and is subsequently sintered in a non-oxidizing atmosphere such as a neutral or reducing atmosphere to produce the article.
"ice
An example of a method of forming an aluminum article in accordance with the present invention is as follows.
Aluminum powder is submerged in a one percent aqueous copper sulfate solution comprising one gram of CuSO -5H O and 99 grams of water. The powder is milled while submerged in the solution. During milling, the oxide surface is abraded from the powder. Copper from the copper sulfate is electromotively displaced from solution and coats the surfaces of the aluminum powder. The coated powder is then removed from the solution and is compacted and sintered in a neutral atmosphere.
While other modifications and variations of method which may be employed within the invention have not been described, the invention is intended to include such that may be embraced within the following claims.
What I claim as new and desire to secure by Letters Patent of the United States is:
1. A method of forming an aluminum article which comprises forming aluminum powder from aluminum metal in the presence of a dilute solution of a more noble metal thereby removing the oxide coating from said aluminum, coating said metal on said aluminum powder from said dilute solution, compacting said coated powder, and sintering said coated powder in a non-oxidizing atmosphere.
2. A method of forming an aluminum article which comprises submerging aluminum metal in a dilute solution of a more noble metal, forming aluminum powder from said aluminum metal thereby removing the oxide coating from said aluminum, coating said metal on said aluminum powder from said dilute solution, removing said coated powder from said solution, compacting said coated powder, and sintering said coated powder in a nonoxidizing atmosphere.
3. A method of forming an aluminum article which comprises submerging aluminum metal in a dilute solution of copper sulfate, forming aluminum powder from said aluminum metal thereby removing the oxide coating from said aluminum, coating said copper on said aluminum powder from said dilute solution, removing said coated powder from said solution, compacting said coating powder, and sintering said coated powder in a nonoxidizing atmosphere.
References Cited by the Examiner UNITED STATES PATENTS 1,214,271 1/1917 Bugbee 204-33 1,457,149 5/1923 Cunningham 204-33 FOREIGN PATENTS 522,463 6/1940 Great Britain.
527,618 10/1940 Great Britain.
REUBEN EPSTEIN, Primary Examiner.
CARL D. QUARFORTH, Examiner.

Claims (1)

1. A METHOD OF FORMING AN ALUMINUM ARTICLE WHICH COMPRISES FORMING ALUMINUM POWDER FROM ALLUMINUM METAL IN THE PRESENCE OF A DILUTE SOLUTION OF A MORE NOBLE METAL THEREBY REMOVING THE OXIDE COATING FROM SAID ALUMINUM, COATING SAID METAL ON SAID ALUMINUM POWDER FROM SAID DILUTE SOLUTION, COMPACTING SAIC COATED POWDER, AND SINTERING SAID COATED POWDER IN NON-OXIDIZING ATMOSPHERE.
US182952A 1958-04-08 1962-03-27 Method of forming an aluminum article Expired - Lifetime US3232753A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US182952A US3232753A (en) 1958-04-08 1962-03-27 Method of forming an aluminum article

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US72705358A 1958-04-08 1958-04-08
US182952A US3232753A (en) 1958-04-08 1962-03-27 Method of forming an aluminum article

Publications (1)

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US3232753A true US3232753A (en) 1966-02-01

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1214271A (en) * 1916-12-04 1917-01-30 American Optical Corp Process of plating.
US1457149A (en) * 1920-05-10 1923-05-29 Cunningham Harry Douglas Preparing aluminium or its alloys for electroplating
GB522463A (en) * 1938-06-28 1940-06-18 Degussa A process for the production of sintered bodies of light metals

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1214271A (en) * 1916-12-04 1917-01-30 American Optical Corp Process of plating.
US1457149A (en) * 1920-05-10 1923-05-29 Cunningham Harry Douglas Preparing aluminium or its alloys for electroplating
GB522463A (en) * 1938-06-28 1940-06-18 Degussa A process for the production of sintered bodies of light metals
GB527618A (en) * 1938-06-28 1940-10-11 Degussa A process for the production of sintered bodies of light metals

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