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70vol.%～78vol.%的Sialon-SiC悬浮体在10～160 s-1范围内显示剪切变稀的幂率特征,突出的“切稀”行为满足凝胶注模成型的要求。建立的悬浮体流变模型与试验值吻合,其流变特征符合Sisko模型。氮化烧结材料的XRD检测和SEM观察显示,材料主要由SiC相和Si4Al2O2N6相组成,显微组织中六方柱状Sialon晶体发育完整,形成了Sialon晶体紧密环绕SiC颗粒的均匀结构。材料的体积密度和抗折强度分别为2.69 g/cm3和56 MPa。
Sialon-SiC suspensions with 70vol.% -78vol.% Showed shear-thinning power characteristics in the range of 10 ~ 160 s-1, and outstanding “thinning” behavior satisfied the requirements of gelcasting. The established rheological model of the suspension agrees well with the experimental data, and its rheological characteristics accord with the Sisko model. The results of XRD and SEM observation show that the material mainly consists of SiC phase and Si4Al2O2N6 phase. The hexagonal columnar Sialon crystal in the microstructure is well developed and the uniform structure of Sialon crystal is formed. The bulk density and flexural strength of the material are 2.69 g / cm3 and 56 MPa, respectively.