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Oxidation behavior and mechanism of oxidation of Si3N4/ TiC micro-nanocomposite ceramic materials
Zhijie Lü 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.6
Oxidation behavior of hot-pressed Si3N4/TiC micro-nanocomposite ceramic materials with Al2O3 and Y2O3 as sinteringadditives was investigated at a dry air temperature of 800-1250 oC. The experimental study included analyses of oxidationbehavior and mechanism. The results show that the relationship between oxidation mass gain and oxidation time is parabolic,where gains in the oxidation mass increase with the growth of TiC content. The surface layer composition of materials afteroxidation was investigated with X-ray diffraction. The oxide layer is composed mainly of SiO2 and TiO2, and a small amountof Si3N4 or TiC phase can be found on the oxidation surface layer, thereby implying that the surface layer is significantlycovered with oxides after oxidation at 1250 oC for 100 hrs. Scanning electron microscopy (SEM) reveals that the oxidationbehavior results in a large number of microcracks and holes in the oxide layer.