US4331477A
Expired / Lapsed
US
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Porous titanium-aluminum alloy and method for producing the same
Assignee: NEC Corp
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Filing: 1979-10-04
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Granted: 1982-05-25
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Expires: 1999-10-04
Abstract
Abstract A porous, sintered Ti-Al alloy has specific surface area of 0.01-1 m 2 /g, density of 20-80% of theoretical density and good mechanical strength, suitable for use in capacitor anode bodies, catalyzers, filters, etc. A mixed, press-shaped body of 10-90 atom. % Ti powder and 90-10 atom. % Al powder is processed by a first heat-treatment at 500° to 665° C. for 5 to 60 minutes to make it porous and then by a second heat-treatment at 700° to 1300° C. for 5 to 60 minutes to increase mechanical strength.
Inventors
- 👤 Yoshimi Kubo
- 👤 Hitoshi Igarashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:48
CPC Classifications
H; H01; H01G; H01G9/00; H01G9/004; H01G9/04; H01G9/042; H01G9/045; B; B22; B22F; B22F3/00; B22F3/10; B22F3/11; B22F3/1103; H01G9/048; H01G9/052; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12153
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
57 words
A porous sintered body of Ti-Al alloy consisting of titanium and aluminum, said alloy body having a density equal to 20 to 80% of its theoretical density, a specific surface area of 0.01 m 2 /g or more, and pores in said porous body being essentially vacant voids from which aluminum has been diffused into titanium particles.
Claim 2
Dependent Claim
57 words
A porous sintered body of Ti-Al alloy consisting of titanium and aluminum, said alloy body having a density equal to 20 to 80% of its theoretical density, a specific surface area of 0.01 m 2 /g or more, and pores in said porous body being essentially vacant voids from which aluminum has been diffused into titanium particles.
Claim 3
Independent Claim
55 words
A method for producing a porous sintered body of Ti-Al alloy comprising the steps of mixing titanium powder and aluminum powder, press-shaping the mixture into a body, and heating the shaped body at a temperature lower than the melting point of aluminum but not lower than 500° C. in a vacuum or inert gas atmosphere.
Claim 4
Independent Claim
55 words
A method for producing a porous sintered body of Ti-Al alloy comprising the steps of mixing titanium powder and aluminum powder, press-shaping the mixture into a body, and heating the shaped body at a temperature lower than the melting point of aluminum but not lower than 500° C. in a vacuum or inert gas atmosphere.
Claim 5
Dependent Claim
29 words
A method for producing a porous sintered body of Ti-Al alloy as claimed in claim 2, in which the heating step is carried out for 5 to 60 minutes.
Claim 6
Independent Claim
83 words
A method for producing a porous sintered body of Ti-Al alloy comprising the steps of mixing titanium powder and aluminum powder, press-shaping the mixture into a body, heating the shaped body in a first heat-treatment step at a temperature lower than the melting point of aluminum but not lower than 500° C. within a vacuum or inert gas atmosphere, and thereafter heating said shaped body in a second heat-treatment step at a temperature equal to or higher than the melting point of aluminum.
Claim 7
Independent Claim
83 words
A method for producing a porous sintered body of Ti-Al alloy comprising the steps of mixing titanium powder and aluminum powder, press-shaping the mixture into a body, heating the shaped body in a first heat-treatment step at a temperature lower than the melting point of aluminum but not lower than 500° C. within a vacuum or inert gas atmosphere, and thereafter heating said shaped body in a second heat-treatment step at a temperature equal to or higher than the melting point of aluminum.
Claim 8
Dependent Claim
38 words
A method for producing a porous sintered body of Ti-Al alloy as claimed in claim 4, in which the second heat-treatment step is carried out in the temperature range between the melting point of aluminum and 1300° C.
Claim 9
Dependent Claim
30 words
A method for producing a porous sintered body of Ti-Al alloy as claimed in claim 4, in which the first heat-treatment step is carried out for 5 to 60 minutes.
Claim 10
Dependent Claim
32 words
A porous sintered body of Ti-Al alloy as defined in claim 1, further characterized in that the specific surface area of said alloy body is not more than 1 m 2 /g.
Claim 11
Dependent Claim
47 words
A porous sintered body of Ti-Al alloy as defined in claim 1, further characterized in that the relative proportions of titanium and aluminum in said alloy body are in the ranges of 10 to 90 atom. % for titanium and 90 to 10 atom. % for aluminum.
Claim 12
Dependent Claim
30 words
A method for producing a porous sintered body of Ti-Al alloy as defined in claim 6, in which the second heat-treatment step is carried out for 5 to 60 minutes.
Claim 13
Dependent Claim
52 words
A method for producing a porous sintered body of Ti-Al alloy as defined in claim 2 or 4, in which said mixing step further comprises the mixing of titanium and aluminum powders in the relative proportions of 10 to 90 atom. % for titanium and 90 to 10 atom. % for aluminum.
Claim 14
Dependent Claim
49 words
A method for producing a porous sintered body of Ti-Al alloy as defined in claim 4, in which the second heat-treatment is carried out immediately after the first heat-treatment by raising the temperature from lower than the melting point of aluminum to higher than the melting point of aluminum.
Claim 15
Dependent Claim
33 words
A method for producing a porous sintered body of Ti-Al alloy as defined in claim 3, in which the heating step is carried out at a temperature of 500° C. for 60 minutes.
Claim 16
Dependent Claim
33 words
A method for producing a porous sintered body of Ti-Al alloy as defined in claim 3, in which the heating step is carried out at a temperature of 650° C. for 60 minutes.
Claim 17
Dependent Claim
33 words
A method for producing a porous sintered body of Ti-Al alloy as defined in claim 3, in which the heating step is carried out at a temperature of 500° C. for 5 minutes.
Claim 18
Dependent Claim
53 words
A method for producing a porous sintered body of Ti-Al alloy as defined in claim 9, in which the first heat-treatment step is carried out at a temperature of 500° C. for 5 minutes and in which the second heat-treatment step is carried out at a temperature of 1000° C. for 60 minutes.
Claim 19
Dependent Claim
53 words
A method for producing a porous sintered body of Ti-Al alloy as defined in claim 9, in which the first heat-treatment step is carried out at a temperature of 600° C. for 30 minutes and in which the second heat-treatment step is carried out at a temperature of 1000° C. for 60 minutes.
Claim 20
Dependent Claim
53 words
A method for producing a porous sintered body of Ti-Al alloy as defined in claim 9, in which the first heat-treatment step is carried out at a temperature of 600° C. for 30 minutes and in which the second heat-treatment step is carried out at a temperature of 1150° C. for 60 minutes.
Claim 21
Independent Claim
92 words
A method for producing a porous sintered body of Ti-Al alloy comprising the steps of mixing titanium powder and aluminum powder, press-shaping the mixture into a body, and heating the shaped body without melting at a temperature which causes an alloying reaction to take place in which aluminum diffusion is predominant and in which vacant holes are left where the aluminum grains were, thereby resulting in a porous body having a specific surface area of 0.01 to 1 m 2 /g and a density of 20 to 80% of its theoretical density.
Claim 22
Independent Claim
92 words
A method for producing a porous sintered body of Ti-Al alloy comprising the steps of mixing titanium powder and aluminum powder, press-shaping the mixture into a body, and heating the shaped body without melting at a temperature which causes an alloying reaction to take place in which aluminum diffusion is predominant and in which vacant holes are left where the aluminum grains were, thereby resulting in a porous body having a specific surface area of 0.01 to 1 m 2 /g and a density of 20 to 80% of its theoretical density.
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) | 1985-05-24 | 1985-11-23 | 1986-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-24 | 1989-11-23 | 1990-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-24 | 1993-11-23 | 1994-05-25 | $7700.00 | Window Closed / Lapsed |