Alumina abrasive grains and method for manufacturing the same

Details Alumina abrasive grains and method for manufacturing the same Alumina abrasive grains and method for manufacturing the same

1979-05-09

1981-02-24

Arnold, Donald J.

Abrasive tool making process, material, or composition

With inorganic material

Metal or metal oxide

264 67, 106 65, C09C 168

Patent

active

042525446

ABSTRACT:
Alumina abrasive grains having a density of more than 3.75 g/cm.sup.3 and a hardness (Knoop) higher than 1,900 Kg/mm.sup.2 are disclosed as useful in manufacturing a grinding wheel with which sharp grinding is carried out under heavy loads. The grains are characterized in that the grain structure thereof is constructed of electrofused or high temperature calcined alumina coarse crystal particles and alumina fine crystal particles which are located between said alumina coarse crystal particles, the latter having particle sizes smaller than that of the former and being processed at a calcination temperature lower than that of the former, wherein said fine crystal particles are sintered integrally with said coarse crystal particles. The method of making the grains is also disclosed.

REFERENCES:
patent: 2635950 (1953-04-01), Robinson
patent: 3491492 (1970-01-01), Ueltz
patent: 3637360 (1972-01-01), Ueltz et al.

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