免烧成硼酸铝-碳化硅耐火材料的性能

以碳化硅为主要原料，分别以酚醛树脂、氧化铝和氧化硼粉体作为常温和高温结合剂，研究了免烧成硼酸铝-碳化硅耐火材料的体积密度、抗折强度和抗热震性.结果表明:当酚醛树脂的质量分数为5%时，耐火材料的体积密度和抗折强度分别为266g·cm-3和13~21MPa；在960℃烧结之后，主要物相为SiC，Al2O3，Al4B2O9；当高温结合剂的质量分数为75%时材料的体积密度最大，为255g·cm-3；当高温结合剂的质量分数为125%时，材料的抗折强度最大，为19MPa；经过5次高温热震后，高温结合剂的质量分数为75%时材料抗热震性较好，强度损失率为25%.

Performances of Burning-Free Aluminium Borate-SiC Refractory

Using silicon carbides as the main raw materials, and the phenolic resin, Al2O3 and B2O3 powders as the room temperature and high temperature bonding agents, respectively, the influences of synthetic conditions on the bulk density, flexural strength and thermal shock resistance of the burning-free aluminum borate-silicon carbide refractory materials were studied. The results showed when the mass fraction of phenolic resin was 5%, the bulk density and flexural strengths of the refractory were 2.66 g·cm^-3 and 13~21 MPa, respectively. After sintering at 960 °C, the main phases were SiC, Al2O3, Al4B2O9. When the mass fraction of the high-temperature binders was 7.5%, the bulk density had the maximum value of 2.55 g·cm^-3. When the mass fraction of the high-temperature binding agent was 12.5%, the flexural strength had the maximum value of 19 MPa. After 5 times high temperature thermal shocks, when the mass fraction of the high-temperature bonding agent was 7.5%, the thermal shock resistance of the refractory was better and the flexural strength loss rate was 25%.