为了开发适合用于薄带连铸生产的侧封板材料，以 h-BN 为主要原料，采用热压烧结工艺于1800℃制备了 BN－SiC－ZrO2系、BN－Si3 N4系以及 BN－MgAl2 O4系三种 BN 基复合材料，并测试和分析了烧结试样的力学性能、热性能、物相组成、显微结构以及薄带连铸效果。结果表明：最佳侧封板试样为1800℃热压烧结的 BN－Si3 N4系试样，其抗折强度为260．3 MPa，维氏硬度为343．5 kg·mm －2，热膨胀系数为2．8×10－6℃－1，1100℃水冷热震次数＞30次；XRD 分析显示其主要晶相是 h-BN、β-Si3 N4以及 SiAlON 相，SEM观察显示试样中晶体均被 SiAlON 相包裹。薄带连铸试验显示，开发的 BN－Si3 N4系侧封板试样的耐磨性能及抗侵蚀性能均优于熔融石英质侧封板的。
Three boron nitride (BN)based composites (BN-SiC-ZrO2 ,BN-Si 3 N 4 ,and BN-MgAl 2 O4 )were prepared with h-BN as the main staring material by hot-pressing at 1 800 ℃.The mechanical properties, thermal properties,phase composition,microstructure and thin strip continuous casting property were test-ed and analyzed.The results indicate that the best side dam material is BN -Si 3 N 4 sintered at 1 800 ℃;it achieves the bending strength of 260.3 MPa,the Vickers hardness of 343.5 kg·mm -2,the thermal ex-pansion coefficient of 2.8 ×10 -6 ℃ -1 ,and shows no crack after thermal shock for 30 times from 1 100 ℃ to water quenching.XRD analysis indicates that the main crystal phases are h-BN,β-Si 3 N 4 and SiAlON.SEM studies show that the crystal grains are wrapped up by SiAlON.The thin strip continuous casting result indi-cates that the side dam specimen BN-Si 3 N 4 has better wear resistance and corrosion resistance than the fusion quartz side dam.
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