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US 3,945,863 AGranted
Process for treating metal powders
AssigneeMartin Marietta Corporation
InventorWalter Precht
Life of this patent
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Abstract
A process for pretreating metal powders for the preparation of dispersion hardened metal alloys whereby an iron, cobalt or nickel base metal powder is homogeneously mixed with a chromium powder and with a prealloyed metal carbide powder and granulated to a powder granulate. The granulate is then classified and reduced to remove oxygen present therein.
Claims14
A process for the pretreating of metal powders for the preparation of dispersion hardened alloys, said process comprising:
- a. homogeneously blending together a mixed powder containing (i) a metal powder having a base metal selected from the group consisting of iron, cobalt and nickel, (ii) a chromium metal powder, (iii) a prealloyed metal carbide powder;
- b. granulating the mixed powder to produce a powdered granulate;
- c. classifying the powdered granulate to separate out the powdered granulate having a mesh size of about -40 + 100;
- and
- d. reducing the oxygen present in the separated out powdered granulate at a temperature of between about 1150.degree.-1300.degree.C. to form an unsintered granulate mass suitable for the preparation of dispersion hardened alloys.
2 more elements
A process for the pretreating of metal powders for the preparation of dispersion hardened alloys, said process comprising:
- a. homogeneously blending together a mixed powder containing (i) a cobalt base nickel metal powder, (ii) a chromium metal powder and (iii) a titanium carbide and vanadium carbide powder mixture, said carbide powder mixture present in the amount of about 3-10 percent of the total weight of the mixed powder;
- b. granulating the mixed powder in the presence of a polyvinyl chloride binder;
- c. classifying the powdered granulate to separate out the powdered granulate having a mesh size of about -40 + 80;
- d. reducing the separated out powdered granulate with hydrogen at a temperature of between 1150.degree.-1300.degree.C. so as to reduce the oxygen present in the powdered granulate to below 400 ppm without sintering the powdered granulate mass;
- and
- e. cooling the granulate to about room temperature in the presence of hydrogen to form a suitable granulate for the preparation of dispersion hardened alloys.
3 more elements
Dependencies are inferred from the claim text.