Title: Vitreous bonded cubic boron nitride abrasive articles

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Claims: What is claimed is:

1. 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.

2. 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.

3. 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.

4. 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.

5. The abrasive article of claim 2 in the form of an abrasive grinding wheel.

6. The abrasive article of claim 3 in the form of an abrasive grinding wheel.
Other info:

Inventors: Balson, Peter Charles (Goshen, OH, US)

Application Number: 565518
Filing Date: 1975-04-07
Publication_date: 1976-10-19
Assignee: Cincinnati Millacron, Inc. (Cincinnati, OH)
Primary Class(es): 51/308 51/295, 51/307
Other Classes:
US Patent Ref:

3528789	Sep, 1970	Mathewson et al.	51/307.
3554717	Jan, 1971	Shaffer et al.	51/309.
3576610	Apr, 1971	Mathewson	51/308.
3743489	Jul, 1973	Wentor, Jr. et al.	51/308.
3852049	Dec, 1974	Hibbs et al.	51/308.

Other Refs: 1,296,589

Nov, 1972	UK

Primary Examiner: Arnold, Donald J.
Assistant Examiner:
Attorney: Dunn; Donald