CAJ | 학술논문

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。
위료개발괄합용우박대련주생산적측봉판재료，이 h-BN 위주요원료，채용열압소결공예우1800℃제비료 BN－SiC－ZrO2계、BN－Si3 N4계이급 BN－MgAl2 O4계삼충 BN 기복합재료，병측시화분석료소결시양적역학성능、열성능、물상조성、현미결구이급박대련주효과。결과표명：최가측봉판시양위1800℃열압소결적 BN－Si3 N4계시양，기항절강도위260．3 MPa，유씨경도위343．5 kg·mm －2，열팽창계수위2．8×10－6℃－1，1100℃수랭열진차수＞30차；XRD 분석현시기주요정상시 h-BN、β-Si3 N4이급 SiAlON 상，SEM관찰현시시양중정체균피 SiAlON 상포과。박대련주시험현시，개발적 BN－Si3 N4계측봉판시양적내마성능급항침식성능균우우용융석영질측봉판적。
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.