Process for the preparation of alumina abrasives

Details Process for the preparation of alumina abrasives Process for the preparation of alumina abrasives

1997-09-23

1999-01-12

Jones, Deborah

Abrasive tool making process, material, or composition

With inorganic material

Metal or metal oxide

51293, 501153, C09C 168

Patent

active

058580379

ABSTRACT:
The present disclosure is directed to a method of converting the preferred hydrated alumina oxide, boehmite, into a green particle which is then sintered to form an abrasive alumina particle. The process involves dispersing boehmite in water at a slightly elevated temperature with an acidic pH, then seeding it with alumina seed particles and drying it, then crushing to desired shapes and sizes, calcining the dried precipitate and sintering the calcined material. This forms high quality alumina abrasive grains. The apparatus used for sintering incorporates an elongate hollow tube, an insulative sleeve thereabout to define an elevated temperature zone, and a microwave generator coupled through a wave guide into a microwave cavity incorporated in the tube. The particles are moved through the tube at a controlled rate to assure adequate exposure to the microwave radiation.

REFERENCES:
patent: 4404003 (1983-09-01), Harris
patent: 4829031 (1989-05-01), Roy et al.
patent: 5302564 (1994-04-01), Winkler et al.
patent: 5542961 (1996-08-01), Swei et al.

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