为优化自结合SiC耐火材料的性能,以碳化硅(3～1、≤1和≤0.074 mm)、硅粉(≤45 μm)和石墨(≤10 μm)为原料,Cr2AlC粉体(≤74 μm)为添加剂,在150 MPa下压制为25 mm × 25 mm × 40 mm的坯体,经110℃干燥、1 300 ℃热处理后制备自结合SiC耐火材料.研究了 Cr2AlC加入量(加入质量分数分别为0、1％、3％和5％)对其常温物理性能、抗硫酸钠侵蚀性能以及抗水蒸气氧化性能的影响.结果表明:随着Cr2AlC加入量增加,经110 ℃干燥后试样的常温物理性能差异不大,经1 300 ℃热处理后试样的常温物理性能呈现出逐渐升高的趋势,抗硫酸钠侵蚀性能先升高后降低.当Cr2AlC粉体加入量为3％(w)时,试样在水蒸气中的质量变化率也较低,综合性能较优.
Effect of Cr2AlC on service performance of self-bonded SiC refractories
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 oxi-dation resistance of the materials were investigated.The results reveal that with the increasing Cr2AIC addi-tion,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 Cr2AIC powder addition is 3％,the specimen exhibits a low mass change rate in the steam,demonstrating good overall performance.
Cr2AlC powderself-bonded SiC refractoriescold physical propertysodium sulfate corrosion resistance
万方数据
