Abrasive products containing fused alumina zirconia and reduced

Details Abrasive products containing fused alumina zirconia and reduced Abrasive products containing fused alumina zirconia and reduced

1988-11-29

1992-09-01

Derrington, James

Abrasive tool making process, material, or composition

Impregnating or coating an abrasive tool

51298, 51309, 264 5, 264 8, 264 9, B24D 300

Patent

active

051435225

ABSTRACT:
An abrasive grain comprising about 20 to about 50% by weight of zirconia; reduced titania in an amount on analysis expressed as titanium dioxide of 1.5 to about 10% by weight; total carbon in an amount of 0.03 to about 0.5% by weight; impurities, if any, in a total amount on analysis expressed as the oxides of not greater than 3% by weight; and a balance of alumina. The microstructure of the abrasive grain comprises primary alumina or zirconia crystals embedded in a supporting alumina-zirconia eutectic matrix. The grain may be produced by combining and melting the alumina and zirconia; adding titania and carbon (excess carbon being required); melting and reducing the titania under reducing furnace conditions; and solidifying the melt in under three minutes by means of a suitable heat sink material. The abrasive grain has a high proportion of tetragonal zirconia and may be used to produce coated abrasive products or bonded abrasive products.

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