A process for forming a ceramic alumina-based abrasive grain from a sol gel which contains aluminum oxide monohydrate, a dissolved metal containing sintering aid and sufficient sodium and/or calcium compound to provide in the ceramic from above about 0.05 to about 1.8 weight percent sodium plus calcium, provided that the weight percent calcium is from 0 to about 1.8 and the weight percent sodium is from 0 to about 0.4. The high sodium and calcium is permitted due to rapid heating of the sol gel after drying through a temperature range of from below about 800.degree. C. to above about 1200.degree. C., prior to sintering the dried gel at a temperature above 1200.degree. C. A grain made by the process and coated, bonded and non-woven abrasive articles comprising the grain.
REFERENCE TO RELATED APPLICATIONS
This application is a continuation of U.S. Ser. No. 668,360, filed Mar. 12, 1991, now abandoned, which is a continuation-in-part of U.S. Ser. No. 445,946, filed Dec. 8, 1989, abandoned, which is a continuation of U.S. Ser. No. 830,478, filed Feb. 13, 1986, abandoned, which is a continuation-in-part of U.S. Ser. No. 666,133, filed Oct. 30, 1984, abandoned, which is a continuation of U.S. Ser. No. 602,272, filed Apr. 23, 1984, abandoned, which is a continuation of U.S. Ser. No. 377,782, filed May 13, 1982, abandoned, which is a continuation-in-part of U.S. Ser. No. 330,123, filed Dec. 14, 1981, abandoned, which is a continuation-in-part of U.S. Ser. No. 267,495, filed May 27, 1981, abandoned.
Alpha alumina-based abrasive grain and method of making the same. The abrasive grain can be incorporated into abrasive products such as coated abrasives, bonded abrasives, non-woven abrasives, and abrasive brushes.
Alpha alumina-based abrasive grain. The abrasive grain can be incorporated into abrasive products such as coated abrasives, bonded abrasives, non-woven abrasives, and abrasive brushes.
