US4407968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic Al2 O3 substoichiometric TiC body
Assignee: Carboloy Inc
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Filing: 1982-08-27
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Granted: 1983-10-04
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Expires: 2002-08-27
Abstract
Abstract A particulate dispersion of Al 2 O 3 , elemental non-diamond carbon and a titanium member selected from the group consisting of elemental titanium, TiH 2 and mixtures thereof is formed into a compact and sintered producing a ceramic composite having a minimum Rockwell A hardness of about 92 and being comprised of an Al 2 O 3 phase and a substoichiometric titanium carbide phase.
Inventors
- 👤 Minyoung Lee
- 👤 Lawrence E. Szala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:32
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/117
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
97 words
A polycrystalline body consisting essentially of a significantly uniform intermixture of an Al 2 O 3 phase and a substoichiometric Ti 1 C x phase where x ranges from about 0.65 to about 0.95, said Ti 1 C x phase ranging from about 20% by weight to about 40% by weight of said body, and said Al 2 O 3 phase ranging from about 80% by weight to about 60% by weight of said body, said body having a minimum Rockwell A hardness of about 92, said Al 2 O 3 phase being a continuous interconnecting network.
Claim 2
Dependent Claim
97 words
A polycrystalline body consisting essentially of a significantly uniform intermixture of an Al 2 O 3 phase and a substoichiometric Ti 1 C x phase where x ranges from about 0.65 to about 0.95, said Ti 1 C x phase ranging from about 20% by weight to about 40% by weight of said body, and said Al 2 O 3 phase ranging from about 80% by weight to about 60% by weight of said body, said body having a minimum Rockwell A hardness of about 92, said Al 2 O 3 phase being a continuous interconnecting network.
Claim 3
Dependent Claim
87 words
A polycrystalline body consisting essentially of a significantly uniform intermixture of an Al 2 O 3 phase and a substoichiometric Ti 1 C x phase where x ranges from about 0.65 to about 0.95, said Ti 1 C x phase ranging from about 20% by weight to less than about 30% by weight of said body, said body having a minimum Rockwell A hardness of about 92, said Al 2 O 3 phase being a continuous interconnecting network and said Ti 1 C x phase being discontinuous.
Claim 4
Dependent Claim
87 words
A polycrystalline body consisting essentially of a significantly uniform intermixture of an Al 2 O 3 phase and a substoichiometric Ti 1 C x phase where x ranges from about 0.65 to about 0.95, said Ti 1 C x phase ranging from about 20% by weight to less than about 30% by weight of said body, said body having a minimum Rockwell A hardness of about 92, said Al 2 O 3 phase being a continuous interconnecting network and said Ti 1 C x phase being discontinuous.
Claim 5
Dependent Claim
94 words
A polycrystalline body consisting essentially of a significantly uniform intermixture of an Al 2 O 3 phase and a substoichiometric Ti 1 C x phase where x ranges from about 0.65 to about 0.95, said Ti 1 C x phase ranging from higher than about 30% by weight to about 40% by weight of said body and being present at least in an amount of sufficient to make said body electrically conducting, said body having a minimum Rockwell A hardness of about 92, said Al 2 O 3 phase being a continuous interconnecting network.
Claim 6
Dependent Claim
94 words
A polycrystalline body consisting essentially of a significantly uniform intermixture of an Al 2 O 3 phase and a substoichiometric Ti 1 C x phase where x ranges from about 0.65 to about 0.95, said Ti 1 C x phase ranging from higher than about 30% by weight to about 40% by weight of said body and being present at least in an amount of sufficient to make said body electrically conducting, said body having a minimum Rockwell A hardness of about 92, said Al 2 O 3 phase being a continuous interconnecting network.
Claim 7
Dependent Claim
48 words
The polycrystalline body of claim 1 wherein said Al 2 O 3 phase has an average grain size ranging from about 1 micron to about 15 microns and said Ti 1 C x phase has a average grain size ranging from about 0.1 micron to about 10 microns.
Claim 8
Dependent Claim
99 words
A cutting medium consisting essentially of a polycrystalline body consisting essentially of significantly uniform intermixed phases of Al 2 O 3 and substoichiometric Ti 1 C x where x ranges from about 0.65 to about 0.95, said Ti 1 C x phase ranging from about 20% by weight to about 40% by weight of said body, and said Al 2 O 3 phase ranging from about 80% by weight to about 60% by weight of said body, said body having a minimum Rockwell A hardness of about 92, said Al 2 O 3 phase being a continuous interconnecting network.
Claim 9
Dependent Claim
99 words
A cutting medium consisting essentially of a polycrystalline body consisting essentially of significantly uniform intermixed phases of Al 2 O 3 and substoichiometric Ti 1 C x where x ranges from about 0.65 to about 0.95, said Ti 1 C x phase ranging from about 20% by weight to about 40% by weight of said body, and said Al 2 O 3 phase ranging from about 80% by weight to about 60% by weight of said body, said body having a minimum Rockwell A hardness of about 92, said Al 2 O 3 phase being a continuous interconnecting network.
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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) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |