Abstract: A process for producing boron nitride which comprises providing a nitrogen-containing nitride promoter, preferably melamine or dicyandiamide, in contact with an admixture of boron oxide and a sufficient amount of boric acid to enhance the formation of boron nitride under a non-oxidizing atmosphere, and maintaining same at sufficiently elevated temperature to form boron nitride.

Abstract: High strength titanium diboride (TiB.sub.2) articles which are obtained by sintering articles preformed from TiB.sub.2 powder mixed with epoxy resin by means of isostatic molding using sintering temperatures found to be a critical variable for achieving maximum strength. Resistance to aluminum attack is achieved by removing contaminating oxides, nitrides, and carbides of titanium by selecting either annealing the sintered article in a boron nitride (BN) pack or by including a small amount of BN or elemental boron in the original TiB.sub.2 powder, such that the finished article is substantially free of such contaminants.