US4108652A
Expired / Lapsed
US
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Method for producing a sintered body of high density
Assignee: Nippon Tungsten Co Ltd
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Filing: 1976-08-17
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Granted: 1978-08-22
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Expires: 1996-08-17
Abstract
Abstract A new hot isostatic pressing method produces sintered material having a very fine structure as well as uniform properties by forming a unique capsule such as a titanium capsule of metal over a presintered material for sintering a ceramic cutting tool material is disclosed.
Inventors
- 👤 Kazuki Ogawa
- 👤 Mitsue Koizumi
- 👤 Mitsuhiko Furukawa
- 👤 Yoshimichi Hara
- 👤 Takashi Kitahira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:25
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; B; B22; B22F; B22F3/00; B22F3/12; B22F3/1208; B22F3/1258; B22F3/1266; C04B35/622; C04B35/64; C04B35/645; C04B35/6455; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12097; Y10T428/23; Y10T428/237
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
158 words
A method for producing a sintered body of high density comprising the following steps: first step: packing a mixed body of a metal powder, a chloride salt and crushed refractory material into a mold which previously contains the pre-sintered body such that said mixed body covers the entire surface of said pre-sintered body, heating said mold until pure metal having a thickness of more than 8 micron is extracted over the surface of said pre-sintered body so that said extracted metal forms a capsule coating of said metal on said body; second step: disposing said capsule-coated body obtained from the first step into a heating furnace and filling said heating furnace with a fluid pressure medium such as a nitrogen gas or an inert gas; and third step: keeping the atmosphere within said furnace at a desired temperature and a desired pressure so as to compress said pre-sintered body at a high temperature by way of said metal-capsule.
Claim 2
Independent Claim
158 words
A method for producing a sintered body of high density comprising the following steps: first step: packing a mixed body of a metal powder, a chloride salt and crushed refractory material into a mold which previously contains the pre-sintered body such that said mixed body covers the entire surface of said pre-sintered body, heating said mold until pure metal having a thickness of more than 8 micron is extracted over the surface of said pre-sintered body so that said extracted metal forms a capsule coating of said metal on said body; second step: disposing said capsule-coated body obtained from the first step into a heating furnace and filling said heating furnace with a fluid pressure medium such as a nitrogen gas or an inert gas; and third step: keeping the atmosphere within said furnace at a desired temperature and a desired pressure so as to compress said pre-sintered body at a high temperature by way of said metal-capsule.
Claim 3
Dependent Claim
25 words
A method for producing a sintered body according to claim 1 wherein said metal powder is titanium powder and said extracted metal is pure titanium.
Claim 4
Dependent Claim
25 words
A method for producing a sintered body according to claim 1 wherein said metal powder is chromium powder and said extracted metal is pure chromium.
Claim 5
Dependent Claim
25 words
A method for producing a sintered body according to claim 1 wherein said metal powder is zirconium powder and said extracted metal is pure zirconium.
Claim 6
Dependent Claim
25 words
A method for producing a sintered body according to claim 1 wherein said metal powder is hafnium powder and said extracted metal is pure hafnium.
Claim 7
Dependent Claim
25 words
A method for producing a sintered body according to claim 1 wherein said metal powder is niobium powder and said extracted metal is pure niobium.
Claim 8
Dependent Claim
25 words
A method for producing a sintered body according to claim 1 wherein said metal powder is tantalum powder and said extracted metal is pure tantalum.
Claim 9
Dependent Claim
25 words
A method for producing a sintered body according to claim 1 wherein said metal powder is tungsten powder and said extracted metal is pure tungsten.
Claim 10
Dependent Claim
25 words
A method for producing a sintered body according to claim 1 wherein said metal powder is iron powder and said extracted metal is pure iron.
Claim 11
Dependent Claim
25 words
A method for producing a sintered body according to claim 1 wherein said metal powder is cobalt powder and said extracted metal is pure cobalt.
Claim 12
Dependent Claim
25 words
A method for producing a sintered body according to claim 1 wherein said metal powder is nickel powder and said extracted metal is pure nickel.
Claim 13
Dependent Claim
25 words
A method for producing a sintered body according to claim 1 wherein said metal powder is molybdenum powder and said extracted metal is pure molybdenum.
Claim 14
Dependent Claim
36 words
A capsule composed of fine pure metal particles which are extracted from a chloride salt; said capsule formed uniformly around the entire surface of a pre-sintered body and having a thickness of more than 8 micron.
Claim 15
Dependent Claim
36 words
A capsule composed of fine pure metal particles which are extracted from a chloride salt; said capsule formed uniformly around the entire surface of a pre-sintered body and having a thickness of more than 8 micron.
Claim 16
Dependent Claim
13 words
A capsule according to claim 13, wherein said pure metal is pure titanium.
Claim 17
Dependent Claim
13 words
A capsule according to claim 13, wherein said pure metal is pure chromium.
Claim 18
Dependent Claim
13 words
A capsule according to claim 13, wherein said pure metal is pure zirconium.
Claim 19
Dependent Claim
13 words
A capsule according to claim 13, wherein said pure metal is pure hafnium.
Claim 20
Dependent Claim
12 words
A capsule according to claim 13, wherein said pure metal is niobium.
Claim 21
Dependent Claim
13 words
A capsule according to claim 13, wherein said pure metal is pure tantalum.
Claim 22
Dependent Claim
13 words
A capsule according to claim 13, wherein said pure metal is pure tungsten.
Claim 23
Dependent Claim
13 words
A capsule according to claim 13, wherein said pure metal is pure iron.
Claim 24
Dependent Claim
13 words
A capsule according to claim 13, wherein said pure metal is pure cobalt.
Claim 25
Dependent Claim
13 words
A capsule according to claim 13, wherein said pure metal is pure nickel.
Claim 26
Dependent Claim
13 words
A capsule according to claim 13, wherein said pure metal is pure molybdenum.
Claim 27
Dependent Claim
13 words
A method according to claim 1 wherein said chloride salt is ammonium chloride.
Claim 28
Dependent Claim
13 words
A method according to claim 1 wherein said chloride salt is potassium chloride.
Claim 29
Dependent Claim
19 words
A method according to claim 1 wherein said metal powder has a particle size of less than 100 mesh.
Claim 30
Dependent Claim
14 words
A method according to claim 1 wherein said pre-sintered body is a ceramic material.
Claim 31
Dependent Claim
24 words
A method according to claim 1 wherein said heating in said first step is effected at a temperature of from 1200° to 1450° C.
Claim 32
Dependent Claim
19 words
A method according to claim 29 wherein said heating in said first step is effected for about 2 hours.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-21 | 1982-02-20 | 1982-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-21 | 1986-02-20 | 1986-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-21 | 1990-02-20 | 1990-08-22 | $7700.00 | Window Closed / Lapsed |