Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
131 words
A process for producing a sintered powdered ferrous alloy article having high heat resistance and abrasion resistance, comprising: admixing (1) 5 to 30% by weight of finely divided component alloy which consists of the following composition, ______________________________________
1 to 4% by weight carbon
10 to 30% by weight chromium
2 to 15% by weight nickel
10 to 30% by weight molybdenum
20 to 40% by weight cobalt
1 to 5% by weight niobium
the balance iron,
______________________________________ (2) 0.8 to 2% by weight of finely divided carbon and (3) the balance consisting of a finely divided ferrous base metal; compression molding said admixture under a pressure of 4 to 6 metric tons/cm 2 , and; sintering said molded admixture in a reducing atmosphere at a temperature of 1050° to 1150° C.
Claim 2
Dependent Claim
131 words
A process for producing a sintered powdered ferrous alloy article having high heat resistance and abrasion resistance, comprising: admixing (1) 5 to 30% by weight of finely divided component alloy which consists of the following composition, ______________________________________
1 to 4% by weight carbon
10 to 30% by weight chromium
2 to 15% by weight nickel
10 to 30% by weight molybdenum
20 to 40% by weight cobalt
1 to 5% by weight niobium
the balance iron,
______________________________________ (2) 0.8 to 2% by weight of finely divided carbon and (3) the balance consisting of a finely divided ferrous base metal; compression molding said admixture under a pressure of 4 to 6 metric tons/cm 2 , and; sintering said molded admixture in a reducing atmosphere at a temperature of 1050° to 1150° C.
Claim 3
Dependent Claim
24 words
A process as claimed in claim 1, wherein the particles of said finely divided component alloy have a size of 150 microns or smaller.
Claim 4
Dependent Claim
25 words
A process as claimed in claim 2, wherein said size of said particles of said finely divided component alloy ranges from 100 to 150 microns.
Claim 5
Dependent Claim
28 words
A process as claimed in claim 1, wherein said finely divided component alloy contains a complex carbide of chromium, molybdenum and niobium, and a simple carbide of niobium.
Claim 6
Dependent Claim
52 words
A process as claimed in claim 1, wherein said finely divided component alloy is in an amount of 10 to 20% by weight, said finely divided carbon in an amount of 1.0 to 1.5% by weight and said finely divided ferrous base metal in an amount of 78.5 to 89% by weight.
Claim 7
Dependent Claim
30 words
A process as claimed in claim 1, wherein said reducing atmosphere consists of a reducing gas selected from the group consisting of hydrogen, heat-decomposed ammonia gas and end thermic gas.
Claim 8
Dependent Claim
182 words
A sintered powdered ferrous alloy article having high heat resistance and abrasion resistance, comprising: (1) 5 to 30% by weight of a finely divided component alloy which consists of the following composition, ______________________________________
1 to 4% by weight carbon
10 to 30% by weight chromium
2 to 15% by weight nickel
10 to 30% by weight molybdenum
20 to 40% by weight cobalt
1 to 5% by weight niobium
the balance iron,
______________________________________ (2) 0.8 to 2% by weight of finely divided carbon, and; (3) the balance consisting of finely divided ferrous base metal; admixed together, compression-molded under a pressure of 4 to 6 metric tons/cm 2 and, then, sintered in a reducing atmosphere at a temperature of 1050 to 1150° C.; the particles of said finely divided component alloy being dispersed in a matrix component formed from said finely divided carbon and ferrous base metal, and being firmly bonded to said matrix with bonding phases formed around said particles and consisting of portions of said matrix and portions of said finely divided component alloy diffused into said portions of said matrix.
Claim 9
Dependent Claim
182 words
A sintered powdered ferrous alloy article having high heat resistance and abrasion resistance, comprising: (1) 5 to 30% by weight of a finely divided component alloy which consists of the following composition, ______________________________________
1 to 4% by weight carbon
10 to 30% by weight chromium
2 to 15% by weight nickel
10 to 30% by weight molybdenum
20 to 40% by weight cobalt
1 to 5% by weight niobium
the balance iron,
______________________________________ (2) 0.8 to 2% by weight of finely divided carbon, and; (3) the balance consisting of finely divided ferrous base metal; admixed together, compression-molded under a pressure of 4 to 6 metric tons/cm 2 and, then, sintered in a reducing atmosphere at a temperature of 1050 to 1150° C.; the particles of said finely divided component alloy being dispersed in a matrix component formed from said finely divided carbon and ferrous base metal, and being firmly bonded to said matrix with bonding phases formed around said particles and consisting of portions of said matrix and portions of said finely divided component alloy diffused into said portions of said matrix.