摘要
本文对含无毒性非氧化物加入剂AlN,AlN+ZrN,ZrN的Si_3N_4陶瓷材料的高温性能作了比较细致的研究,并与含MgO.Al_2O_3,MgO,BeSiN_2的陶瓷材料作了对比。研究表明,采用复合加入剂AlN+ZrN,避免了BeSiN_2有毒及其材料常温力学性能不佳的问题,在很大程度上提高了Si_3N_4材料的高温性能。其在1400℃下的氧化速率常数较之以MgO.Al_2O_3为加入剂的Si_3N_4材料低两个数量级,1400℃的抗弯强度与室温强度的比值由41.5％提高到71％,同时抗热震性相当好(△Tc≥900℃),从而为在高温度、高应力条件下使用Si_3N_4瓷陶材料提供了一条有效的途径。
The high-temperature properties of Si_3N_4 ceramics with non-toxic, non-oxide additives AlN, AlN-ZrN, ZrN were investigated and compared with those of Si_3N_4 ceramics with additives MgO, MgO·Al_2O_3 and BeSiN_2. It is shown that the utilization of composite additive AlN-ZrN instead of BeSiN_2 avoids toxicity and enhances the room-temperature(RT)properties of the Si_3N_4 ceramics. AlN-ZrN as additive of Si_3N_4 instead of MgO·Al_2O_3 enhances the high-tempera-ture properties of the ceramics significantly: the oxidation rate constant at 1400℃ is two orders lower, while the ratio of bending strength at 1400℃ to bending strength at RT improves from 41.5％(for Si_3N_4+ MgO·Al_2O_3) to 71％(for Si_3N_4+ZrN-AlN)and the thermal shock resistance of the new ceramics is rather good(△Tc≥900℃). It is prospective to use these new Si_3N_4 ceramics for high-temperature, high—stressed conditions.
出处
《粉末冶金技术》
CAS
CSCD
北大核心
1989年第4期194-202,共9页
Powder Metallurgy Technology
