US3574671A - Method for coating metal powders - Google Patents
Method for coating metal powders Download PDFInfo
- Publication number
- US3574671A US3574671A US777495A US3574671DA US3574671A US 3574671 A US3574671 A US 3574671A US 777495 A US777495 A US 777495A US 3574671D A US3574671D A US 3574671DA US 3574671 A US3574671 A US 3574671A
- Authority
- US
- United States
- Prior art keywords
- charge
- powder
- water
- carbon
- 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 - Lifetime
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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/16—Metallic particles coated with a non-metal
Definitions
- Powder metallurgy is particularly advantageous in the production of high-alloy tool steel articles, because a very fine, even carbide distribution can be produced.
- this structure serves to enhance the properties of the steel in tool applications.
- the steps of producing such articles from powdered metal involve heating a powder charge within a container to an elevated temperature and thereafter compacting the powder by the application of pressure, which may be either mechanical or fluid pressure. In this operation because of the metal being in finely divided form an extremely large surface area thereof is exposed to the atmosphere.
- the carbon-containing material for example lampblack
- the carbon-containing material for example lampblack
- a more particular object of the invention is to provide a method for uniformly coating a powdered metal charge with a carbon-containing material by agitating the charge in the presence of the carbon-containing material in finely divided form.
- a chage of metal powder to be compacted is agitated in a suitable mixing device with a quantity of water.
- the temperature of the powder is increased to a temperature suitable to vaporize at least a portion of the water.
- Temperatures on the order of or F. are typical. Satisfactory temperatures can be achieved customarily by vigorous tumbling without the use of any supplemental heat source.
- any auxiliary heating means such as radiant heating, may be employed to achieve vaporization of the water.
- the water Upon vaporization of the water, in combination with continued agitation of the powdered metal charge, the water is substantially evenly dispersed throughout the charge.
- a quantity of an element in finely divided form to be coated over the particles of the charge is added.
- the powdered metal charge which is coated with carboncontaining material
- a gas-tight container and subjected to out-gassing in accordance with the conventional practice as described hereinabove.
- the carbon-containing material is of a size of less than about one micron. Lampblack and powdered graphite are the preferred carbon-containing materials for use in the practice of the invention.
- a charge of A181 M-2 tool steel powder of minus 100 mesh in a quantity of about 800 pounds was placed in a conventional V-blender. Water in the amount of 40 cc. was added to the charge and such was tumbled for one-half hour. During tumbling, temperatures on the order of about 90 or 100 F. were achieved, which caused substantial vaporization of the water throughout the charge. Lampblack of a submicron size in an amount 01 about 1.36 pounds was added to the charge in the tumbler and tumbling, was performed for an additional one-hour.
- Tumbling time may vary from one-half to as long as eight hours, depending upon the size of the charge, the amount of carbon-containing material to be added and the efiiciency of the blending apparatus.
- the charge was visually examined to determine the degree of uniformity with respect to coating of the particles of the charge with lampblack. This examination revealed that substantially total and uniform coating of the powders of the charge with lampblack had been achieved.
- these resulting areas of high-carbon concentration throughout the charge do not achieve the object of having a uniform quantity of carbon in readily available form dispersed throughout the charge to facilitate deoxidation during a subsequent out-gassing operation.
- these areas of high-carbon concentration can have an adverse effect on the quality of final products produced by compacting the powdered metal charge. It may be seen, therefore, that the present invention provides advantage from the standpoint of rendering the manufacturing operation more efficient, as well as improving the quality of the final product.
- a method for preparing metal powders for compacting comprising agitating a charge of metal powder containing a quantity of water, while increasing the temperature of the powder to vaporize at least a portion of the water and disperse said water substantially evenly throughout said powdered metal charge, adding to the thus treated charge in the presence of the vaporized water a quantity of a carbon material in finely divided solid form, said material being in a particle form finer than that of said metal powder and in a quantity less than that of said metal powder charge, further agitating said charge with said material therein until said material is substantially uniformly coated over said metal powder throughout the charge.
- said carbon material is at least one material selected from the group consisting of lampblack and powdered graphite.
Abstract
Description
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US77749568A | 1968-11-20 | 1968-11-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3574671A true US3574671A (en) | 1971-04-13 |
Family
ID=25110417
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US777495A Expired - Lifetime US3574671A (en) | 1968-11-20 | 1968-11-20 | Method for coating metal powders |
Country Status (1)
Country | Link |
---|---|
US (1) | US3574671A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4316938A (en) * | 1976-09-27 | 1982-02-23 | General Electric Company | High density carbon adsorbent composite |
-
1968
- 1968-11-20 US US777495A patent/US3574671A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4316938A (en) * | 1976-09-27 | 1982-02-23 | General Electric Company | High density carbon adsorbent composite |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: COLT INDUSTRIES OPERATING CORP. Free format text: MERGER AND CHANGE OF NAME;ASSIGNOR:CRUCIBLE CENTER COMPANY (INTO) CRUCIBLE INC. (CHANGED TO);REEL/FRAME:004120/0308 Effective date: 19821214 |
|
AS | Assignment |
Owner name: CRUCIBLE MATERIALS CORPORATION, PENNSYLVANIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:COLT INDUSTRIES OPERATING CORP.;REEL/FRAME:004194/0621 Effective date: 19831025 Owner name: CRUCIBLE MATERIALS CORPORATION, A DE CORP. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:COLT INDUSTRIES OPERATING CORP.;REEL/FRAME:004194/0621 Effective date: 19831025 |
|
AS | Assignment |
Owner name: MELLON BANK, N.A. FOR THE CHASE MANHATTAN BANK (NA Free format text: SECURITY INTEREST;ASSIGNOR:CRUCIBLE MATERIALS CORPORATION, A CORP. OF DE.;REEL/FRAME:004490/0452 Effective date: 19851219 Owner name: CHASE MANHATTAN BANK, THE (NATIONAL ASSOCIATION) A Free format text: SECURITY INTEREST;ASSIGNOR:CRUCIBLE MATERIALS CORPORATION, A CORP. OF DE.;REEL/FRAME:004490/0452 Effective date: 19851219 Owner name: MELLON FINANCIAL SERVICES CORPORATION Free format text: SECURITY INTEREST;ASSIGNOR:CRUCIBLE MATERIALS CORPORATION, A CORP. OF DE.;REEL/FRAME:004490/0410 Effective date: 19851219 Owner name: MELLON BANK, N.A. AS AGENT FOR MELLON BANK N.A. & Free format text: SECURITY INTEREST;ASSIGNOR:CRUCIBLE MATERIALS CORPORATION, A CORP. OF DE.;REEL/FRAME:004490/0410 Effective date: 19851219 |