The United States of America As Represented by the Administrator of the

Norton Company

Michael J White

Larry Kaufman

Gordon E Hickory

Jeffrey Bull

High temperature ablation resistant ceramic composites have been made. These ceramics are composites of zirconium diboride and zirconium carbide with silicon carbide, hafnium diboride and hafnium carbide with silicon carbide and ceramic composites which contain mixed diborides and/or carbides of zirconium and hafnium, along with silicon carbide.

Ablation resistant zirconium and hafnium ceramics

An improved abrasive product such as a grinding wheel is disclosed. The abrasive product contains an active filler mixture of tin, FeS.sub.2, and K.sub.2 SO.sub.4, which mixture improves the grinding quality and versatility of the abrasive product.

Growing community of inventors

Cumberland, RI, United States of America

Michael J White