Abstract
α-Si3N4 particles coated with 10 and 25 vol% nano-sized TiN were prepared by coating the surface of the Si3N4 particles with TiO2, followed by nitridation. Coating by TiO2 was accomplished by dispersing α-Si3N4 powders (0.16 and 1.6 g l−1) in a solution of TiCl4, urea and aqueous HCl, and heating at 105°C for 130 and 190 min. The success of the coating procedure was confirmed by TEM observation with electron diffraction and EDX analysis. Zeta potential measurements suggest that the TiO2 coating on the surface of Si3N4 particles occurs at a pH between 3.7 and 4.3 by the attractive force of opposite charges. When the TiO2 on the surface of the Si3N4 is nitrided with NH3 gas at 1000°C, it is completely changed to TiN of uniform particle size (20 nm).
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