Method for making vitreous bonded abrasive article and article made by the method
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United States of America Patent
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Jan 12, 1993
Grant Date -
N/A
app pub date -
Jan 23, 1992
filing date -
Jan 23, 1992
priority date (Note) -
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Abstract
A method for making vitreous bonded grinding wheels having a porosity of from 20 to 55% by volume is provided that reduces or prevent shrinkage. The method includes a step of mixing unclad, non-abrasive, non-metallic, particulate, inorganic solid shrinkage control agent with the abrasive grain, vitreous matrix precursor and other ingredients for producing the wheel. Non-abrasive hexagonal boron nitride is a preferred shrinkage control agent and may be used in amounts ranging for 1 to 10% by volume based on the volume of the grinding wheel. Reduced shrinkage of wheels made by the method over comparable wheels made without the shrinkage control agent is obtained.
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