Fused abrasive grains consisting essentially of corundum, zircon

Details Fused abrasive grains consisting essentially of corundum, zircon Fused abrasive grains consisting essentially of corundum, zircon

1975-11-03

1977-07-12

Arnold, Donald J.

Abrasive tool making process, material, or composition

With synthetic resin

51308, 51309A, B24D 302, C09C 168, C08J 514

Patent

active

040351629

ABSTRACT:
Fused abrasive grain consists essentially of: (1) crystalline phases of corundum and zirconia, with an average crystallite size smaller than 300 microns and at least in part being an eutectic matrix and (2) analytically by weight, about 44 to 91% (preferably 44 to 80%) Al.sub.2 O.sub.3, about 5 to 50% (preferably 17.6 to 50%) ZrO.sub.2 to 0.1 to 12% (preferably 0.2 to 5%) R.sub.2 O.sub.3 wherein R is at least one metal selected from vanadium, chromium, manganese and cobalt, the percentage of R.sub.2 O.sub.3 is based on all R metal content calculated as R.sub.2 O.sub.3, and the balance, if any, being incidental impurities not exceeding 2%. The R metal content is present as oxide in solid solution within the corundum, as random particles of aluminate phase and/or as small particles of the R metal scattered throughout the grain, depending upon the relative oxidizing-reducing ambient conditions during melting. Melted raw material is formed, directly or indirectly, into grain of appropriate particle sizes for use in abrasive articles such as grinding wheels, coated abrasive products and the like.

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J. N. Brecker et al., NSF Hard Material Research vol. 1, 1972 Penn St. U. Materials Research Lab pp. 5-10, 30-49, 60-61 and 96-97.
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