关键词: Cr₂AlC粉体, 自结合SiC耐火材料, 常温物理性能, 抗硫酸钠侵蚀性能

Abstract: To optimize the properties of self-bonded SiC refractories,the specimens were fabricated using silicon carbide (3-1,≤1,and ≤0.074 mm),silicon powder (≤45 μm) and graphite (≤10 μm) as raw materials,and Cr₂AlC powder (≤74 μm) as an additive,pressing under 150 MPa into 25 mm×25 mm×40 mm shapes,drying at 110 ℃ and heat treating at 1 300 ℃.The effects of the Cr₂AlC addition (0,1%,3%,and 5%,by mass) on the cold physical properties,sodium sulfate corrosion resistance,and steam oxidation resistance of the materials were investigated.The results reveal that with the increasing Cr₂AlC addition,the cold physical properties of the specimens after drying at 110 ℃ differ slightly;however,the cold physical properties of the specimens fired at 1 300 ℃ show a gradually increasing trend;while the sodium sulfate corrosion resistance initially increases and then decreases.When the Cr₂AlC powder addition is 3%,the specimen exhibits a low mass change rate in the steam,demonstrating good overall performance.

Key words: Cr₂AlC powder, self-bonded SiC refractories, cold physical property, sodium sulfate corrosion resistance