US4710425A
Expired / Lapsed
US
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Abrasion resistant articles and composition utilizing a boron-doped refractory particle
Assignee: Verizon Laboratories Inc
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Filing: 1985-12-17
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Granted: 1987-12-01
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Expires: 2005-12-17
Abstract
Abstract This invention relates to abrasion resistant materials and to articles of manufacture made therefrom. More particularly, it is concerned with abrasion resistant materials comprising boron doped TiC or boron doped VC distributed in a matrix containing silicon nitride and with articles made therefrom.
Inventors
- 👤 II J. Gary Baldoni
- 👤 Sergej-Tomislav Buljan
- 👤 Vinod K. Sarin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:04
CPC Classifications
B; B23; B23B; B23B27/00; B23B27/14; B23B27/148; C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/593; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/256
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
35 words
An improved abrasion resistant composition consisting essentially of a densified ceramic matrix having dispersed therein, at least one refractory dispersoid doped with boron, said refractory dispersoid having an average particle size below about 20 μm.
Claim 2
Dependent Claim
35 words
An improved abrasion resistant composition consisting essentially of a densified ceramic matrix having dispersed therein, at least one refractory dispersoid doped with boron, said refractory dispersoid having an average particle size below about 20 μm.
Claim 3
Dependent Claim
14 words
The abrasion resistant composition of claim 1, wherein the dispersoid is boron doped TiC.
Claim 4
Dependent Claim
15 words
The abrasion resistant composition of claim 1, wherein the dispersoid is boron doped vandium carbide.
Claim 5
Dependent Claim
68 words
The improved abrasion resistant composition of claim 1, which consists essentially of a silicon nitride matrix having dispersed therein up to about 50 volume percent of a refractory metal carbide or nitride dispersoid doped with boron; and from about 1 to 25 weight percent of a densification aid selected from the group consisting of oxides or nitrides of magnesium, aluminum, silicon, yttrium, zirconium, hafnium, lanthanides and mixtures thereof.
Claim 6
Dependent Claim
19 words
The abrasion resistant composition of claim 4, wherein the dispersoid has an average particle size below about 10 μm.
Claim 7
Dependent Claim
19 words
The abrasion resistant composition of claim 4, wherein the dispersoid has an average particle size below about 1 μm.
Claim 8
Dependent Claim
19 words
The abrasion resistant composition of claim 4, wherein the dispersoid has an average particle size below about 0.5 μm.
Claim 9
Dependent Claim
16 words
The abrasion resistant cutting tool comprising a hot pressed admixture of the composition of claim 1.
Claim 10
Dependent Claim
13 words
The cutting tool of claim 8, further comprising at least one refractory coating.
Claim 11
Dependent Claim
16 words
An abrasion resistant cutting tool comprising a hot pressed admixture of the composition of claim 4.
Claim 12
Dependent Claim
13 words
The cutting tool of claim 10, further comprising at least one refractory coating.
Claim 13
Dependent Claim
16 words
An abrasion resistant cutting tool comprising a hot pressed admixture of the composition of claim 5.
Claim 14
Dependent Claim
13 words
The cutting tool of claim 12, further comprising at least one refractory coating.
Claim 15
Dependent Claim
16 words
An abrasion resistant cutting tool comprising a hot pressed admixture of the composition of claim 6.
Claim 16
Dependent Claim
13 words
The cutting tool of claim 14, further comprising at least one refractory coating.
Claim 17
Dependent Claim
16 words
An abrasion resistant cutting tool comprising a hot pressed admixture of the composition of claim 8.
Claim 18
Dependent Claim
13 words
The cutting tool of claim 16, further comprising at least one refractory coating.
Claim 19
Dependent Claim
59 words
A process for the manufacture of an abrasion resistant cutting tool comprising hot pressing of the composition of claim 1 at a pressure of from about 300 psi to 7000 psi, for from about 1 to 4 hours, at a temperature of from about 1650° C. to 1800° C., and shaping the hot pressed ceramic into a cutting tool.
Claim 20
Dependent Claim
59 words
A process for the manufacture of an abrasion resistant cutting tool comprising hot pressing of the composition of claim 4 at a pressure of from about 300 psi to 7000 psi, for from about 1 to 4 hours, at a temperature of from about 1650° C. to 1800° C., and shaping the hot pressed ceramic into a cutting tool.
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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) | 1990-11-30 | 1991-06-01 | 1991-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-30 | 1995-06-01 | 1995-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-30 | 1999-06-01 | 1999-12-01 | $7700.00 | Window Closed / Lapsed |