氧化铝基耐火材料的高温耐磨性

Abrasion resistance of alumina based refractory products at elevated temperatures

采用新研制的高温耐磨性实验装置,测定了五种氧化铝基耐火制品的高温耐磨性能.结果表明:当材料处于弹性变形阶段时,随温度的升高,磨损体积变化不明显;当温度继续升高,材料达到塑性变形阶段时,磨损体积大幅度减小.以高硬度矿物相为主晶相的耐火制品更耐磨,但材料的烧结程度对耐磨性的影响更显著,对于具有同样主矿物相的材料,烧结程度越好,耐磨性也越好.高温下材料中产生低熔点液相时,缓冲了磨损,其作用超过矿物相硬度对耐磨性的影响.材料的磨损体积与其高温抗折强度紧密相关,在脆性变形阶段,高温抗折强度越高,磨损体积越小;在塑性变形阶段,材料的磨损体积和高温抗折强度均显著降低.

Abrasion resistances of five kinds of alumina based refractory products at elevated temperatures were determined using a new developed high-temperature abrasion facility. The results show that the wear volume of the refractory products during elastic de- formation has a little change with temperature rising, but in the plastic deformation range it drops sharply. The refractory products with a high hardness mineral as the main crystal phase have a better abrasion resistance. Sintering degree has a more obvious effect on the abrasion resistance. For the refractory products with the same main mineral phase, the denser the sintering degree, the better the abra- sion resistance is. When a low melting point liquid phase forms in the refractory products at elevated temperatures, the wear volume de- creases, and the liquid phase has a more effect on the abrasion resistance than the hardness of the mineral phase. The wear volume has a close relation with hot modulus of rupture （ HMOR）. The higher the HMOR, the smaller the wear volume is during elastic deforma- tion. The HMOR and wear volume decrease rapidly with temperature rising during plastic deformation.