Aluminum silicate particles having a layer of a rare earth oxide

Details Aluminum silicate particles having a layer of a rare earth oxide Aluminum silicate particles having a layer of a rare earth oxide

1974-05-29

1976-01-27

Arnold, Donald J.

Abrasive tool making process, material, or composition

With inorganic material

Clay, silica, or silicate

51309, 427215, B24D 334

Patent

active

039349888

ABSTRACT:
Polishing powders, for use particularly in the optical industry, are based upon alumina silicate materials, the particles of which are coated with rare earth oxide. The polishing powders are preferably based upon the calcined china clay product known as "Molochite" and are preferably made by precipitating a solution of rare earth compounds, e.g. their sulphates, on to the alumina silicate base material and calcining this material to convert the rare earth compounds into oxides. The polishing powders give excellent results, comparable with the known product based upon a rare and expensive calcium silicate mineral.

REFERENCES:
patent: 2389352 (1945-11-01), Fisher
patent: 2744001 (1956-05-01), Harman et al.
patent: 3573886 (1971-04-01), Goetzinger et al.
patent: 3768989 (1973-10-01), Goetzinger et al.

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