Purification of carbothermally produced aluminum nitride

Details Purification of carbothermally produced aluminum nitride Purification of carbothermally produced aluminum nitride

1990-09-13

1992-03-31

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

501 98, 423412, C04B 3558

Patent

active

051008467

ABSTRACT:
A method is disclosed for purifying aluminum nitride produced by carbothermal reaction of aluminum oxide, carbon and nitrogen. Precursor pellets including aluminum oxide and carbon are exposed to nitrogen under conditions sufficient to carbothermally produce aluminum oxide, thereby producing aluminum nitride pellets having surface portions relatively rich in thermal conductivity-lowering and color-causing impurities compared to core portions of the aluminum nitride pellets. Significant amounts of the surface portions are thereafter removed to thereby significantly increase the purity of the aluminum nitride pellets.

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