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中文摘要：
针对氮化烧成Si3N4/SiC复相耐火材料的成本高、能耗大及传热损失大的突出问题,研究制备了免烧成低密度Si3N4/SiC复相耐火材料。研究以硅藻土作为硅源,蔗糖作为碳源,通过碳热还原氮化法制备了Si3N4/SiC复相粉体。再以该复相粉体为原料,以添加不同量Si粉（0%,5%,10%）的蔗糖作为结合剂,分别在60、90、120℃3个温度点热处理2 h,150℃热处理8 h后,制备成免烧成低密度Si3N4/SiC复相耐火材料。采用XRD和SEM对粉体的物相及微观形貌进行表征。结果表明:粉体的物相为α-Si3N4,β-Si3N4,β-Si C和Fe3Si,通过计算得到α-Si3N4,β-Si3N4和β-Si C的相对含量分别为4.28%,29.74%和59.40%;硅藻土中含有较高含量的Fe杂质元素导致少量Fe3Si生成;粉体中β-Si3N4呈短柱状,β-Si C以细小颗粒的形式存在。在N2（99.999%）保护条件下,1000°C模拟使用这种Si3N4/SiC复相耐火材料1h后发现,Si粉的添加量对其体积密度和显气孔率的影响不大,体积密度变化范围是1.481.51g·cm-3,显气孔率变化范围是33.36%34.62%;Si粉添加量为5%时,材料的抗折强度和抗压强度达到最大,分别为3.78和31.95 MPa。
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