Aluminum nitride/aluminum oxynitride/group IVB metal nitride abrasive particles derived from a sol-gel process
AssigneeMinnesota Mining and Manufacturing Company
InventorsJames P. Mathers, William P. Wood
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Abstract
A multiphase, microcrystalline, nearly fully dense ceramic composite has grains comprising 0 to 95 volume percent aluminum nitride, 0 to 95 volume percent polytypes of aluminum nitride, 0 to 95 volume percent gamma-aluminum oxynitride, and 5 to 50 volume percent of at least one of titanium nitride, zirconium nitride and hafnium nitride. The composite is useful to prepare a ceramic abrasive grit or article.
Claims11
A microcrystalline, nearly fully dense ceramic composite consisting of grains consisting essentially of
- 0 to 90 volume percent aluminum nitride or polytypes of aluminum nitride,
- 5 to 95 volume percent gamma-aluminum oxynitride, and
- 5 to 50 volume percent of at least one of Periodic Group IVB metal nitrides,
- said composite being essentially free of alumina and containing less than 4 volume percent pores, and the size of said grains being less than 5 micrometers.
A ceramic abrasive particle consisting of a uniform composite of microcrystalline components, said composite consisting essentially of
- 0 to 90 volume percent aluminum nitride or polytypes of aluminum nitride,
- 5 to 95 volume percent gamma-aluminum oxynitride, and
- 5 to 50 volume percent of at least one of Periodic Group IVB metal nitrides,
- said composite being essentially free of alumina and containing less than 4 volume percent pores, and the size of said components being less than 5 micrometers.
A microcrystalline, nearly fully dense, ceramic composite consisting of grains consisting essentially of
- 0 to 80 volume percent aluminum nitride or polytypes of aluminum nitride,
- 0 to 85 volume percent gamma-aluminum oxynitride, and
- 15 to 35 volume percent of at least one of Periodic Group IVB metal nitrides,
- said composite containing less than 4 volume percent pores, and the size of said grains being less than 5 micrometers.
A ceramic abrasive particle consisting of a uniform composite of microcrystalline components, said composite consisting essentially of
- 0 to 80 volume percent aluminum nitride or polytypes of aluminum nitride,
- 0 to 85 volume percent gamma-aluminum oxynitride, and
- 15 to 35 volume percent of at least one of Periodic Group IVB metal nitrides, said composite having less than 4 volume percent pores, and the size of said components being less than 5 micrometers.
A microcrystalline, nearly fully dense, ceramic composite consisting of grains consisting essentially of
- 0 to 90 volume percent aluminum nitride or polytypes of aluminum nitride,
- 5 to 95 volume percent gamma-aluminum oxynitride,
- 5 to 50 volume percent of titanium nitride, and more than zero and up to 3 volume percent zirconium nitride,
- said composite being essentially free of alumina and containing less than 4 volume percent pores, and the size of said grains being less than 5 micrometers.
A ceramic abrasive particle consisting of a uniform composite of microcrystalline components, said composite consisting essentially of
- 5 to 90 volume percent aluminum nitride or polytypes of aluminum nitride,
- 5 to 95 volume percent gamma-aluminum oxynitride,
- 5 to 50 volume percent of titanium nitride, and more than zero and up to 3 volume percent zirconium nitride,
- said composite being essentially free of alumina and containing less than 4 volume percent pores, and the size of said components being less than 5 micrometers.
Dependencies are inferred from the claim text.