Preparation of Aluminum Nitride-Titanium Nitride Solid-Solutions using Preceramic Materials

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Pyrolytic preparations of Ti-Al-N ceramics from three blended precursors were investigated. The precusors were perpared by stirring (HAINィイD1iィエD1Pr)ィイD2mィエD2 and an aminolysis product of Ti (NMeィイD22ィエD2)ィイD24ィエD2 with MeHNCHィイD22ィエD2CHィイD22ィエD2NHMe in CィイD26ィエD2HィイD26ィエD2. IR and ィイD11ィエD1H NMR analyses suggested that essentially no Ti-N-Al bonds were present in the precursors. Pyrolysis of the precursors under NHィイD23ィエD2-NィイD22ィエD2 led to the formation of brown solids with ceramic yields of about 30%, and the Ti : Al ratios in the pyrolyzed products were close to those of the precursors. XRD analysis of the pyrolyzed product from the precursor with Ti : Al=5 : 1 indicated the formation of a NaCl-type compound as the only crystalline phase. Pyrolysis of the precursor with Ti : Al=2 : 1 led to the formation of AIN besides the major NaCl-type compound. A ceramic composite containing AIN and the NaCl-type compound was formed by pyrolysis of the precursor with Ti : Al=1 : 2. The lattice parameters of the NaCl-type compounds indicate that it is Ti (N, C, O) rather than (Ti, Al) N. The SEM observation revealed that the products consisted of particles with diameters of 20-40 nm.