Patent ID: 7168267

Claim:
A method for making amorphous material comprising at least 35 percent by weight Al 2 O 3 , based on the total weight of the amorphous material, the method comprising: melting (a) particulate, metallic material comprising at least one of a metal, M, that has a negative enthalpy of oxide formation or an alloy thereof; and (b) at least one of: (i) a M oxide and a source of metal oxide other than the M oxide; or (ii) a complex metal oxide comprising M oxide to provide a melt, wherein at least a portion of the metal, M, in the melt is oxidized, and wherein at least one of the M oxide, the metal oxide other than the M oxide, or the complex metal oxide comprises Al 2 O 3 ; and cooling the melt to provide the amorphous material.