✍ Scribed by Kristoffer Krnel; Aljoša Maglica; Tomaž Kosmač
No coin nor oath required. For personal study only.
In this study the fabrication of -SiAlON/TiN nanocomposites by sintering Si 3 N 4 powder coated with nanosized titania or TiN particles was studied. The TiO 2 coating on the Si 3 N 4 powder was prepared by the sol-gel method from tetra-butyl titanate. Two approaches were used for the preparation of the -SiAlON/TiN composites: the first was the reaction sintering of TiO 2 -coated Si 3 N 4 powder, and the second was the calcination of the coated Si 3 N 4 powder and subsequent sintering. The results show that during the thermal treatment and/or sintering of the coated Si 3 N 4 powder the titania reacts with the Si 3 N 4 to form TiN. However, during sintering the segregation and densification of small, nanometric TiN particles occurs. Despite the fact that the samples were prepared from relatively cheap starting materials and were sintered at atmospheric pressure they have high densities and relatively good bending strengths.
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