以SiC粉和硅粉为原料，原位合成的Cr₂O₃为催化剂，采用催化氮化法制备了Si₃N₄/SiC耐火材料，研究了催化剂用量及氮化温度对耐火材料物相组成、微观形貌、物理性能和力学性能的影响。结果表明：当氮化温度为1 673 K，Cr₂O₃含量（与硅粉质量之比，下同）为3%时，硅粉完全氮化，耐火材料主要由颗粒状SiC和晶须状α-Si₃N₄、β-Si₃N₄等组成；随着Cr₂O₃含量的增加，Si₃N₄晶须的数量增多，长度增大，耐火材料变得致密；随氮化温度的升高，耐火材料的抗折强度和耐压强度均增大，当氮化温度为1 673 K、Cr₂O₃含量为3%时，抗折强度和耐压强度均最大，分别为34 MPa和132 MPa。

With SiC powder and silicon powder as raw materials, in-situ synthesized Cr₂O₃ as catalyst, Si₃N₄/SiC refractory was prepared by catalytic nitridation. The effects of catalyst addition amount and nitridation temperature on the phase composition, micromorphology, physical properties and mechanical properties of the refractory were investigated. The results show that when the nitridation temperature was 1 673 K and the Cr₂O₃ content (mass ratio of Cr₂O₃ to silicon powder) reached 3wt%, the silicon powder was completely nitrided; the refractory was composed of grain-like SiC, whisker-like α-Si₃N₄ and β-Si₃N₄. With increasing content of Cr₂O₃, the amount and length of Si₃N₄ whisky increased; the refractory became densification. With the rise of nitridation temperature, the flexural strength and compressive strength of the refractory increased. When the nitridation temperature was 1 673 K and the Cr₂O₃ content was 3wt%, the flexural strength and compressive strength reached the largest values of 34 MPa and 132 MPa, respectively.