Patent US5819154A successfully refreshed from Google Patents.
US5819154A
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Manufacturing process of sintered iron alloy improved in machinability, mixed powder for manufacturing, modification of iron alloy and iron alloy product
Assignee: Resonac Corp
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Filing: 1996-12-06
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Granted: 1998-10-06
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Expires: 2016-12-06
Abstract
Abstract Disclosed is a sintered iron alloy, a method of manufacturing the same, a powdered mixture used for manufacturing the same and a method of modifying the surface of the iron alloy. The sintered iron alloy is produced by compacting a powdered mixture comprising: boron or boron compound which is selected from the group consisting of boron oxide, boron sulfide, boron halide, boron hydride, boric acid, borate and tetrafluoroborate; 0.1 to 2.0% by weight of graphite; and iron, and sintering it. Alternatively, the iron alloy is produced by impregnating a modifier containing boron or boron compound, into a green compact, a presintered compact or sintered body which contains iron and carbon, and heating it.
Inventors
- 👤 Bo Hu
- 👤 Tadayuki Tsutsui
- 👤 Kei Ishii
- 👤 Hideo Shikata
- 👤 Jun Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:32
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/12; B22F3/10; B22F3/1003; B22F3/1007; C; C22; C22C; C22C33/00; C22C33/02; C22C33/0207; C22C33/0228
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
75 words
A process for manufacturing a sintered iron alloy, comprising the steps of: preparing a powdered mixture comprising: boron compound which is selected from the group consisting of boron oxide, boron sulfide, boron, halide, boron hydride, boric acid, borate and tetraflouroborate; 0.1 to 2.0% by weight of graphite; and iron; compressing said powdered mixture to form a green compact; and sintering said green compact in a non-oxidizing atmosphere at a temperature of 1,000° to 1,250° C.
Claim 2
Dependent Claim
75 words
A process for manufacturing a sintered iron alloy, comprising the steps of: preparing a powdered mixture comprising: boron compound which is selected from the group consisting of boron oxide, boron sulfide, boron, halide, boron hydride, boric acid, borate and tetraflouroborate; 0.1 to 2.0% by weight of graphite; and iron; compressing said powdered mixture to form a green compact; and sintering said green compact in a non-oxidizing atmosphere at a temperature of 1,000° to 1,250° C.
Claim 3
Dependent Claim
59 words
The manufacturing process of claim 1, wherein the green compact at the compressing step is formed to have a green density of about 6.4 to 7.2 g/cm 3 , and the non-oxidizing atmosphere of the sintering step is selected from the group consisting of hydrogen gas, nitrogen gas, dissociated ammonia gas, argon gas, exothermic gas, endothermic gas and vacuum.
Claim 4
Dependent Claim
60 words
A process for manufacturing a sintered iron alloy comprising the steps of: preparing a powdered mixture comprising: 0.01 to 1.0% by weight of diboron trioxide, 0.1 to 2.0% by weight of graphite, and iron; compressing said powdered mixture to form a green compact; and sintering said green compact in a non-oxidizing atmosphere at a temperature of 1,000° to 1,250° C.
Claim 5
Dependent Claim
60 words
A process for manufacturing a sintered iron alloy comprising the steps of: preparing a powdered mixture comprising: 0.01 to 1.0% by weight of diboron trioxide, 0.1 to 2.0% by weight of graphite, and iron; compressing said powdered mixture to form a green compact; and sintering said green compact in a non-oxidizing atmosphere at a temperature of 1,000° to 1,250° C.
Claim 6
Dependent Claim
37 words
The manufacturing process of claim 3, wherein the boron compound is introduced into the powdered mixture by adding boron nitride powder which contains diboron trioxide at a content of 10 to 40% by weight as an impurity.
Claim 7
Dependent Claim
95 words
A process of manufacturing a sintered iron alloy, comprising the steps of: preparing a powdered mixture comprising iron and containing 0.1 to 2.0% by weight of graphite; compressing the powdered mixture to form a green compact; preparing a solution containing a boron component which is selected from the group consisting of boron, boron oxide, boron sulfide, boron halide, boron hydride, boric acid, borate and tetrafluoroborate; impregnating the solution into the green compact; and sintering the green compact in a non-oxidizing atmosphere at a temperature of 1,000° to 1,250° C. to obtain a sintered iron alloy.
Claim 8
Dependent Claim
95 words
A process of manufacturing a sintered iron alloy, comprising the steps of: preparing a powdered mixture comprising iron and containing 0.1 to 2.0% by weight of graphite; compressing the powdered mixture to form a green compact; preparing a solution containing a boron component which is selected from the group consisting of boron, boron oxide, boron sulfide, boron halide, boron hydride, boric acid, borate and tetrafluoroborate; impregnating the solution into the green compact; and sintering the green compact in a non-oxidizing atmosphere at a temperature of 1,000° to 1,250° C. to obtain a sintered iron alloy.
Claim 9
Dependent Claim
33 words
The manufacturing process of claim 5, further comprising the step of: placing the green compact, before the impregnating step, in an atmosphere of a reduced pressure to remove air from the green compact.
Claim 10
Dependent Claim
26 words
The manufacturing process of claim 5, further comprising the steps of: processing the sintered iron alloy; and carburizing the sintered iron alloy after the processing step.
Claim 11
Dependent Claim
110 words
A process of manufacturing a sintered iron alloy, comprising the steps of: preparing a powdered mixture comprising iron and containing 0.1 to 2.0% by weight of graphite; compressing the powdered mixture to form a green compact; presintering the green compact at a temperature of 300° to 950° C. to obtain a presintered compact; preparing a solution containing a boron component which is selected from the group consisting of boron, boron oxide, boron sulfide, boron halide, boron hydride, boric acid, borate and tetrafluoroborate; impregnating the solution into the presintered compact to obtain impregnated compact; and sintering the impregnated compact in a non-oxidizing atmosphere at a temperature of 1,000° to 1,250° C.
Claim 12
Dependent Claim
110 words
A process of manufacturing a sintered iron alloy, comprising the steps of: preparing a powdered mixture comprising iron and containing 0.1 to 2.0% by weight of graphite; compressing the powdered mixture to form a green compact; presintering the green compact at a temperature of 300° to 950° C. to obtain a presintered compact; preparing a solution containing a boron component which is selected from the group consisting of boron, boron oxide, boron sulfide, boron halide, boron hydride, boric acid, borate and tetrafluoroborate; impregnating the solution into the presintered compact to obtain impregnated compact; and sintering the impregnated compact in a non-oxidizing atmosphere at a temperature of 1,000° to 1,250° C.
Claim 13
Dependent Claim
33 words
The manufacturing process of claim 8, further comprising the step of placing the presintered compact, before the impregnating step, in an atmosphere of a reduced pressure to remove air from the presintered compact.
Claim 14
Dependent Claim
26 words
The manufacturing process of claim 8, further comprising the steps of: processing the sintered iron alloy; and carburizing the sintered iron alloy after the processing step.
Claim 15
Independent Claim
70 words
A method of modifying an iron alloy containing carbon, comprising the steps of: preparing a solution containing a boron component which is selected from the group consisting of boron, boron oxide, boron sulfide, boron halide, boron hydride, boric acid, borate and tetrafluoroborate; impregnating the solution into the iron alloy; and heating the iron alloy after the impregnating step in a non-oxidizing atmosphere at a temperature of 1,000° to 1,250° C.
Claim 16
Independent Claim
70 words
A method of modifying an iron alloy containing carbon, comprising the steps of: preparing a solution containing a boron component which is selected from the group consisting of boron, boron oxide, boron sulfide, boron halide, boron hydride, boric acid, borate and tetrafluoroborate; impregnating the solution into the iron alloy; and heating the iron alloy after the impregnating step in a non-oxidizing atmosphere at a temperature of 1,000° to 1,250° C.
Claim 17
Dependent Claim
44 words
The modification method of claim 11, wherein the solution is prepared by dissolving the boron component at a concentration of 0.01 to 0.3 g/ml into a solvent including water or alcohol which is selected from the group consisting of methanol, ethanol, 1-propanol and 2-propanol.
Claim 18
Dependent Claim
33 words
The modification method of claim 11, further comprising the step of: placing the iron alloy, before the impregnating step, in an atmosphere of a reduced pressure to remove air from the iron alloy.
Claim 19
Dependent Claim
29 words
The manufacturing process of claim 1, wherein the green compact at the compressing step is formed to have a green density of about 6.4 to 7.2 g/cm 3 .
Claim 20
Dependent Claim
36 words
The manufacturing process of claim 1, wherein the non-oxidizing atmosphere of the sintering step is selected from the group consisting of hydrogen gas, nitrogen gas, dissociated ammonia gas, argon gas, exothermic gas, endothermic gas and vacuum.
Claim 21
Dependent Claim
76 words
A process for manufacturing a sintered iron alloy, comprising the steps of: preparing a powdered mixture comprising: boron compound which is selected from the group consisting of boron, boron oxide, boron sulfide, boron, halide, boron hydride, boric acid, borate and tetraflouroborate; 0.1 to 2.0% by weight of graphite; and iron; compressing said powdered mixture to form a green compact; and sintering said green compact in a non-oxidizing atmosphere at a temperature of 1,000° to 1,250° C.
Claim 22
Dependent Claim
76 words
A process for manufacturing a sintered iron alloy, comprising the steps of: preparing a powdered mixture comprising: boron compound which is selected from the group consisting of boron, boron oxide, boron sulfide, boron, halide, boron hydride, boric acid, borate and tetraflouroborate; 0.1 to 2.0% by weight of graphite; and iron; compressing said powdered mixture to form a green compact; and sintering said green compact in a non-oxidizing atmosphere at a temperature of 1,000° to 1,250° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-10-05 | 2002-04-06 | 2002-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-10-05 | 2006-04-06 | 2006-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-10-05 | 2010-04-06 | 2010-10-06 | $7700.00 | Window Closed / Lapsed |