采用自行设计的气流喷砂式热态固体粒子冲蚀磨损试验机,在空气气氛和90°攻角条件下,研究了冲蚀粒子大小(36#和90#SiC)以及不同温度(室温、1000、1200、1400 ℃)对高铝砖冲蚀磨损行为的影响.结果表明:冲蚀粒子大小对高铝砖的冲蚀磨损作用影响显著.高铝砖冲蚀率随温度升高逐渐减小,1200 ℃时达到最小,为10 mg/g.1000 ℃和室温下样品表现出脆性材料冲蚀特征.1200 ℃高温下样品的塑性和韧性提高,大大削弱了冲蚀粒子的动能,且骨料与基质的结合强度提高,使得抗冲蚀能力得到增强.
Effects of ambient temperatures and impact particle sizes on solid particle erosion behavior of high alumina bricks were studied. The erosion tests were performed by the self-designed sand-blast type particle erosion-wear equipment, with the impact angle of 90° in the air atmosphere, respectively at 25, 1000, 1200, and 1400 ℃. 36# and 90# SiC abrasives were employed as impact particles. The results indicated that the solid particle erosion behavior of high alumina bricks was influenced remarkably by SiC impact particle size. The mass erosion rate decreased with the temperature increasing, and reached the minimum value of 10 mg/g at 1200 ℃. At 1000 ℃ and room temperature, the erosion behavior and material loss mechanism were in accordance with erosion theory of classic brittle materials. The erosion resistance of high alumina refractory bricks was enhanced due to the increase of plasticity and toughness, as well as the bonded strength between aggregates and the matrix.
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