US5069714A
Expired / Lapsed
US
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Segregation-free metallurgical powder blends using polyvinyl pyrrolidone binder
Assignee: Quebec Metal Powders Ltd
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Filing: 1990-01-17
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Granted: 1991-12-03
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Expires: 2010-01-17
Abstract
Abstract An improved metallurgical powder composition of a ferrous powder and at least one of an alloying powder, a lubricant or other additive. Lining, dusting and/or segregation of the composition is prevented by use of a polyvinyl pyrrolidone binding agent.
Inventors
- 👤 Francis Gosselin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:25
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/22; B22F1/00; B22F1/10; B22F2998/00
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
111 words
A metallurgical powder composition capable of forming by a P/M process a compact in a dye cavity, said powder composition being uniformly blended and comprising ferrous powder having a maximum particle size of at most about 300 microns; and at least one powder of (i) an alloying agent in the amount of less than about 15 weight percent, (ii) a lubricant in the amount of less than about 5 weight percent or (iii) an additive in the amount of less than about 5 weight percent, said composition further comprising a binding agent for preventing the alloying powder, lubricant or additive from segregating from said composition, said binding agent comprising polyvinyl pyrrolidone.
Claim 2
Dependent Claim
111 words
A metallurgical powder composition capable of forming by a P/M process a compact in a dye cavity, said powder composition being uniformly blended and comprising ferrous powder having a maximum particle size of at most about 300 microns; and at least one powder of (i) an alloying agent in the amount of less than about 15 weight percent, (ii) a lubricant in the amount of less than about 5 weight percent or (iii) an additive in the amount of less than about 5 weight percent, said composition further comprising a binding agent for preventing the alloying powder, lubricant or additive from segregating from said composition, said binding agent comprising polyvinyl pyrrolidone.
Claim 3
Dependent Claim
25 words
The metallurgical composition according to claim 1, wherein said alloying powder, lubricant or additive has a maximum particle size of less than said ferrous powder.
Claim 4
Dependent Claim
30 words
The metallurgical composition according to claim 2, wherein said ferrous powder is steel powder and said binding agent is present in the amount of less than about 0.2 weight percent.
Claim 5
Dependent Claim
23 words
The metallurgical composition according to claim 3, wherein said binding agent is present in the amount of less than about 0.15 weight percent.
Claim 6
Dependent Claim
23 words
The metallurgical composition according to claim 4, wherein said binding agent is present in the amount of less than about 0.1 weight percent.
Claim 7
Dependent Claim
30 words
The metallurgical composition according to claim 2, wherein said ferrous powder is iron powder and said binding agent is present in the amount of less than about 0.3 weight percent.
Claim 8
Dependent Claim
23 words
The metallurgical composition according to claim 6, wherein said binding agent is present in the amount of less than about 0.25 weight percent.
Claim 9
Dependent Claim
23 words
The metallurgical composition according to claim 7, wherein said binding agent is present in the amount of less than about 0.2 weight percent.
Claim 10
Dependent Claim
22 words
The metallurgical composition according to claims 3 or 6, wherein said alloying powder is present at less than about 10 weight percent.
Claim 11
Dependent Claim
24 words
The metallurgical composition according to claims 3, 4, 6 or 7, wherein said alloying powder is present .at less than about 3 weight percent.
Claim 12
Dependent Claim
22 words
The metallurgical composition according to claim 9, wherein said alloying powder has a maximum particle size of less than about 150 microns.
Claim 13
Dependent Claim
23 words
The metallurgical composition according to claim 11, wherein said alloying powder is present in the amount of less than about 3 weight percent.
Claim 14
Dependent Claim
22 words
The metallurgical composition according to claim 10, wherein said alloying powder has a maximum particle size of less than about 50 microns.
Claim 15
Dependent Claim
37 words
The metallurgical composition according to claims 5 or 8, wherein said alloying powder is present in the amount of less than about 3 weight percent and has an average particle size of less than about 20 microns.
Claim 16
Dependent Claim
21 words
The metallurgical composition according to claims 3 or 6, wherein said lubricant is present at less than about 2 weight percent.
Claim 17
Dependent Claim
23 words
The metallurgical composition according to claims 3, 4, 6 or 7, where said lubricant is present at less than about 1 weight percent.
Claim 18
Dependent Claim
21 words
The metallurgical composition according to claim 15, wherein said lubricant has a maximum particle size of less than about 100 microns.
Claim 19
Dependent Claim
21 words
The metallurgical composition according to claim 16, wherein said lubricant has a maximum particle size of less than about 50 microns.
Claim 20
Dependent Claim
33 words
The metallurgical composition according to claims 5 or 8, wherein said lubricant is present at less than about 1 weight percent and has an average particle size of less than about 25 microns.
Claim 21
Dependent Claim
21 words
The metallurgical composition according to claims 3 or 6, wherein said additive is present at less than about 2 weight percent.
Claim 22
Dependent Claim
23 words
The metallurgical composition according to claims 3, 4, 6 or 7, where said additive is present at less than about 1 weight percent.
Claim 23
Dependent Claim
21 words
The metallurgical composition according to claim 21, wherein said additive has an average particle size of less than about 50 microns.
Claim 24
Dependent Claim
21 words
The metallurgical composition according to claim 20, wherein said additive has a maximum particle size of less than about 50 microns.
Claim 25
Dependent Claim
21 words
The metallurgical composition according to claim 21, wherein said additive has a maximum particle size of less than about 20 microns.
Claim 26
Dependent Claim
33 words
The metallurgical composition according to claims 5 or 8, wherein said additive is present at less than about 1 weight percent and has an average particle size of less than about 5 microns.
Claim 27
Dependent Claim
20 words
The metallurgical composition according to claim 2, wherein said binding agent has a molecular weight of less than about 400,000.
Claim 28
Dependent Claim
19 words
The metallurgical composition according to claims 26, wherein said binding agent has a molecular weight of from about 10,000-100,000.
Claim 29
Dependent Claim
30 words
The metallurgical composition according to claim 26, wherein said binding agent is a copolymer of vinyl pyrrolidone and at least about 50 percent of the monomer units comprise vinyl pyrrolidone.
Claim 30
Dependent Claim
20 words
The metallurgical composition according to claim 28, wherein at least about 70 percent of the monomer units comprise vinyl pyrrolidone.
Claim 31
Dependent Claim
19 words
The metallurgical composition according to claim 29, wherein said copolymer is a copolymer of vinyl pyrrolidone and vinyl acetate.
Claim 32
Dependent Claim
14 words
The metallurgical composition according to claim 2, wherein said binding agent is a homopolymer.
Claim 33
Dependent Claim
20 words
The metallurgical composition according to claim 31, wherein said binding agent has a molecular weight of less than about 400,000.
Claim 34
Dependent Claim
19 words
The metallurgical composition according to claim 32, wherein said binding agent has a molecular weight of from about 10,000-100,000.
Claim 35
Dependent Claim
18 words
The metallurgical composition according to any of claims 26, 27, 32 or 33, wherein said copolymer is water-soluble.
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