Patent US3986847A successfully refreshed from Google Patents.
US3986847A
Expired / Lapsed
US
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Vitreous bonded cubic boron nitride abrasive articles
Assignee: Cincinnati Milacron Chemicals Inc
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Filing: 1975-04-07
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Granted: 1976-10-19
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Expires: 1995-04-07
Abstract
Abstract A vitreous bonded cubic boron nitride grinding wheel is provided which optionally contains silicon carbide or other abrasive having a coefficient of thermal expansion substantially the same as the coefficient of thermal expansion of cubic boron nitride, and wherein the vitreous bond, having a coefficient of thermal expansion substantially the same as the coefficient of thermal expansion of cubic boron nitride, is substantially non-reactive with cubic boron nitride and the optional abrasive.
Inventors
- 👤 Peter Charles Balson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:50
CPC Classifications
B; B24; B24D; B24D18/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
174 words
An improved abrasive article having an abrasive section comprising: a. an abrasive phase 10 to 100% by volume of cubic boron nitride abrasive grain and from 0 to 90% of the total volume of the abrasive phase of a second abrasive grain having a coefficient of thermal expansion substantially the same as the coefficient of thermal expansion of cubic boron nitride, and b. a vitreous bond bonding said abrasive phase said bond having a coefficient of thermal expansion substantially the same as the coefficient of thermal expansion of cubic boron nitride and being substantially non-reactive with the cubic boron nitride abrasive grain and said second abrasive grain, characterized in that on the surface of the cubic boron nitride abrasive grain interfacing said vitreous bond there being chemically formed thereon a thin, adherent boric oxide layer in a thickness effective to promote a strong bond between said cubic boron nitride abrasive grains and said vitreous bond but less than that which would alter the structure or physical properties of said cubic boron nitride abrasive grains.
Claim 2
Dependent Claim
174 words
An improved abrasive article having an abrasive section comprising: a. an abrasive phase 10 to 100% by volume of cubic boron nitride abrasive grain and from 0 to 90% of the total volume of the abrasive phase of a second abrasive grain having a coefficient of thermal expansion substantially the same as the coefficient of thermal expansion of cubic boron nitride, and b. a vitreous bond bonding said abrasive phase said bond having a coefficient of thermal expansion substantially the same as the coefficient of thermal expansion of cubic boron nitride and being substantially non-reactive with the cubic boron nitride abrasive grain and said second abrasive grain, characterized in that on the surface of the cubic boron nitride abrasive grain interfacing said vitreous bond there being chemically formed thereon a thin, adherent boric oxide layer in a thickness effective to promote a strong bond between said cubic boron nitride abrasive grains and said vitreous bond but less than that which would alter the structure or physical properties of said cubic boron nitride abrasive grains.
Claim 3
Dependent Claim
125 words
An improved abrasive article having an abrasive section comprising: a. an abrasive phase of cubic boron nitride, and b. a vitreous bond bonding said abrasive phase said bond having a coefficient of thermal expansion substantially the same as the coefficient of thermal expansion of cubic boron nitride and being substantially non-reactive with the cubic boron nitride abrasive grain, characterized in that on the surface of the cubic boron nitride abrasive grain interfacing said vitreous bond there being chemically formed thereon a thin, adherent boric oxide layer in a thickness effective to promote a strong bond between said cubic boron nitride abrasive grain and said vitreous bond but less than that which would alter the structure or physical properties of said cubic boron nitride abrasive grains.
Claim 4
Dependent Claim
125 words
An improved abrasive article having an abrasive section comprising: a. an abrasive phase of cubic boron nitride, and b. a vitreous bond bonding said abrasive phase said bond having a coefficient of thermal expansion substantially the same as the coefficient of thermal expansion of cubic boron nitride and being substantially non-reactive with the cubic boron nitride abrasive grain, characterized in that on the surface of the cubic boron nitride abrasive grain interfacing said vitreous bond there being chemically formed thereon a thin, adherent boric oxide layer in a thickness effective to promote a strong bond between said cubic boron nitride abrasive grain and said vitreous bond but less than that which would alter the structure or physical properties of said cubic boron nitride abrasive grains.
Claim 5
Dependent Claim
156 words
An improved abrasive article having an abrasive section comprising: a. as the abrasive phase 10 to 100% by volume of cubic boron nitride and from 0 to 90% of the total volume of the abrasive phase of silicon carbide abrasive grain, and b. as a vitreous bond bonding said abrasive phase a vitreous bond having a coefficient of thermal expansion substantially the same as the coefficient of thermal expansion of cubic boron nitride and being substantially non-reactive with the cubic boron nitride abrasive grain and silicon carbide abrasive grain, characterized in that on the surface of the cubic boron nitride abrasive grain interfacing said vitreous bond there being chemically formed thereon a thin, adherent boric oxide layer in a thickness effective to promote a strong bond between said cubic boron nitride abrasive grains and said vitreous bond but less than that which would alter the structure or physical properties of said cubic boron nitride abrasive grains.
Claim 6
Dependent Claim
156 words
An improved abrasive article having an abrasive section comprising: a. as the abrasive phase 10 to 100% by volume of cubic boron nitride and from 0 to 90% of the total volume of the abrasive phase of silicon carbide abrasive grain, and b. as a vitreous bond bonding said abrasive phase a vitreous bond having a coefficient of thermal expansion substantially the same as the coefficient of thermal expansion of cubic boron nitride and being substantially non-reactive with the cubic boron nitride abrasive grain and silicon carbide abrasive grain, characterized in that on the surface of the cubic boron nitride abrasive grain interfacing said vitreous bond there being chemically formed thereon a thin, adherent boric oxide layer in a thickness effective to promote a strong bond between said cubic boron nitride abrasive grains and said vitreous bond but less than that which would alter the structure or physical properties of said cubic boron nitride abrasive grains.
Claim 7
Dependent Claim
44 words
The abrasive article of claim 3 wherein as the said abrasive phase there is employed 50% of the total volume of the abrasive phase of cubic boron nitride abrasive grain and 50% of the total volume of the abrasive phase silicon carbide abrasive grain.
Claim 8
Dependent Claim
14 words
The abrasive article of claim 2 in the form of an abrasive grinding wheel.
Claim 9
Dependent Claim
14 words
The abrasive article of claim 3 in the form of an abrasive grinding wheel.
References Cited (Backward Citations)
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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) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |