Patent US4539299A successfully refreshed from Google Patents.
US4539299A
Expired / Lapsed
US
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Microcomposite of metal boride and ceramic particles
Assignee: ALSIMAG CERAMICS COMPANY A DE CORP
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Filing: 1984-07-26
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Granted: 1985-09-03
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Expires: 2004-07-26
Abstract
Abstract A particulate mixture of ceramic powder, boron and a hydride of a metal selected from the group consisting of hafnium, niobium, tantalum, titanium, vanadium, zirconium and mixtures thereof is hot pressed decomposing the hydride and reacting the resulting metal with boron producing a polycrystalline microcomposite comprised of a continuous phase of the boride of the metal which encapsulates at least about 20% by volume of the ceramic particles and which either encapsulates or is intermixed with the balance of said ceramic particles.
Inventors
- 👤 Milivoj K. Brun
- 👤 Minyoung Lee
- 👤 Lawrence E. Szala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:23
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/01; C04B35/10; C04B35/111; C04B35/117; C04B35/56; C04B35/563; C04B35/5805; C04B35/58064; C04B35/58071; C04B35/58078; C04B35/622; C04B35/64; C04B35/645; C04B35/65
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
156 words
An electrically conducting polycrystalline microcomposite comprised of a continuous interconnecting phase of a boride of a metal selected from the group consisting of hafnium, niobium, tantalum, titanium, vanadium, zirconium and mixtures thereof and a phase comprised of ceramic particles, said continuous metal boride phase encapsulating at least about 20% by volume of said phase of ceramic particles and encapsulating or being intermixed with the balance of said ceramic particles, said metal boride phase having an average grain size of less than about 15 microns, said ceramic particles having an average particle size of less than about 15 microns and being comprised of ceramic grains and clusters of grains, said encapsulating metal boride phase encapsulating individual ceramic grains and/or individual clusters of grains, said microcomposite having a density greater than 95% of the theoretical density for said microcomposite, said continuous metal boride phase ranging from about 20% by volume to about 80% by volume of said microcomposite.
Claim 2
Dependent Claim
156 words
An electrically conducting polycrystalline microcomposite comprised of a continuous interconnecting phase of a boride of a metal selected from the group consisting of hafnium, niobium, tantalum, titanium, vanadium, zirconium and mixtures thereof and a phase comprised of ceramic particles, said continuous metal boride phase encapsulating at least about 20% by volume of said phase of ceramic particles and encapsulating or being intermixed with the balance of said ceramic particles, said metal boride phase having an average grain size of less than about 15 microns, said ceramic particles having an average particle size of less than about 15 microns and being comprised of ceramic grains and clusters of grains, said encapsulating metal boride phase encapsulating individual ceramic grains and/or individual clusters of grains, said microcomposite having a density greater than 95% of the theoretical density for said microcomposite, said continuous metal boride phase ranging from about 20% by volume to about 80% by volume of said microcomposite.
Claim 3
Dependent Claim
16 words
The polycrystalline microcomposite according to claim 1 wherein said continuous metal boride phase is hafnium diboride.
Claim 4
Dependent Claim
16 words
The polycrystalline microcomposite according to claim 1 wherein said continuous metal boride phase is niobium boride.
Claim 5
Dependent Claim
16 words
The polycrystalline microcomposite according to claim 1 wherein said continuous metal boride phase is tantalum boride.
Claim 6
Dependent Claim
16 words
The polycrystalline microcomposite according to claim 1 wherein said continuous metal boride phase is titanium diboride.
Claim 7
Dependent Claim
16 words
The polycrystalline microcomposite according to claim 1 wherein said continuous metal boride phase is vanadium boride.
Claim 8
Dependent Claim
16 words
The polycrystalline microcomposite according to claim 1 wherein said continuous metal boride phase is zirconium diboride.
Claim 9
Dependent Claim
38 words
The polycrystalline microcomposite according to claim 1 wherein said metal boride phase ranges from about 20% by volume to about 30% by volume of said microcomposite and encapsulates more than about 90% by volume of said ceramic particles.
Claim 10
Dependent Claim
137 words
An electrically conducting polycrystalline microcomposite comprised of a continuous phase of titanium diboride and a phase comprised of ceramic particles, said continuous titanium diboride phase encapsulating at least about 20% by volume of said phase of ceramic particles and encapsulating or being intermixed with the balance of said ceramic particles, said titanium diboride phase having an average particle size of less than about 5 microns, said ceramic particles having an average particle size of less than about 5 microns and being comprised of ceramic grains and clusters of grains, said encapsulating titanium diboride phase encapsulating individual ceramic grains and/or individual clusters of grains, said microcomposite having a density greater than 98% of the theoretical density for said microcomposite, said continuous titanium diboride phase ranging from about 20% by volume to about 30% by volume of said microcomposite.
Claim 11
Dependent Claim
137 words
An electrically conducting polycrystalline microcomposite comprised of a continuous phase of titanium diboride and a phase comprised of ceramic particles, said continuous titanium diboride phase encapsulating at least about 20% by volume of said phase of ceramic particles and encapsulating or being intermixed with the balance of said ceramic particles, said titanium diboride phase having an average particle size of less than about 5 microns, said ceramic particles having an average particle size of less than about 5 microns and being comprised of ceramic grains and clusters of grains, said encapsulating titanium diboride phase encapsulating individual ceramic grains and/or individual clusters of grains, said microcomposite having a density greater than 98% of the theoretical density for said microcomposite, said continuous titanium diboride phase ranging from about 20% by volume to about 30% by volume of said microcomposite.
Claim 12
Dependent Claim
13 words
The microcomposite according to claim 9 wherein said ceramic particles are boron carbide.
Claim 13
Dependent Claim
156 words
An electrically conducting polycrystalline microcomposite comprised of a continuous interconnecting phase of a boride of a metal selected from the group consisting of hafnium, niobium, tantalum, titanium, vanadium, zirconium and mixtures thereof and a phase comprised of ceramic particles, said continuous metal boride phase encapsulating more than about 90% by volume of said phase of ceramic particles and encapsulating or being intermixed with the balance of said ceramic particles, said metal boride phase having an average grain size of less than about 5 microns, said ceramic particles having an average particle size of less than about 5 microns and being comprised of ceramic grains and clusters of grains, said encapsulating metal boride phase encapsulating individual ceramic grains and/or individual clusters of grains, said microcomposite having a density greater than 98% of the theoretical density for said microcomposite, said phase of ceramic particles ranging from about 45% by volume to about 80% by volume of said microcomposite.
Claim 14
Dependent Claim
156 words
An electrically conducting polycrystalline microcomposite comprised of a continuous interconnecting phase of a boride of a metal selected from the group consisting of hafnium, niobium, tantalum, titanium, vanadium, zirconium and mixtures thereof and a phase comprised of ceramic particles, said continuous metal boride phase encapsulating more than about 90% by volume of said phase of ceramic particles and encapsulating or being intermixed with the balance of said ceramic particles, said metal boride phase having an average grain size of less than about 5 microns, said ceramic particles having an average particle size of less than about 5 microns and being comprised of ceramic grains and clusters of grains, said encapsulating metal boride phase encapsulating individual ceramic grains and/or individual clusters of grains, said microcomposite having a density greater than 98% of the theoretical density for said microcomposite, said phase of ceramic particles ranging from about 45% by volume to about 80% by volume of said microcomposite.
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) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |