β-Si3N4,β-Si_3N_4
β-Si3N4 grainsβ-Si3N4晶粒
1.The results reveal that the diameter and aspect ratio of elongated β-Si3N4 grains in the composites decrease with increasing h-BN content.结果表明:随着h-BN含量增加,柱状β-Si3N4晶粒的直径和长径比均下降;未加h-BN时,β-Si3N4陶瓷以沿晶断裂为主,添加体积含量为6%和8%的h-BN后,复合材料出现明显的沿晶和穿晶断裂,而添加10%h-BN的陶瓷复合材料则以沿晶断裂为主。
3)β Si 3N 4 single crystal particlesβ-Si3N4单晶
4)β-Si3N4 rod crystalsβ-Si3N4棒晶
1.In this paper, the effects of seeding β-Si3N4 rod crystals prepared by self-propagating high-temperature synthesis on the mechanical properties of silicon nitride ceramic were investigated.与不加棒晶相比,加入8wt%的β-Si3N4棒晶可使陶瓷的韧性从4。
5)β-Si_3N_4 fibersβ-Si3N4纤维
6)β-Si3N4 ceramicβ-Si3N4陶瓷
1.Progresses of reasearch on the factors of the thermal conductivity,preparation methods,mechanical and electrical properties of high thermal conductivity β-Si3N4 ceramics are reviewed.从热导率的影响因素、制备方法及力学电学性能3方面归纳了高热导β-Si3N4陶瓷的研究进展,并对高热导β-Si3N4陶瓷存在的问题和今后的研究方向提出了几点看法。
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1-[β,β,β-三(对氯苯基)丙酰]-4-甲基哌嗪分子式:C26H25CL3N2O分子量:487.85CAS号:2390-22-9性质:该品溶点213-215℃。作兽用驱虫药时常用基盐,又称Dieroden。盐酸盐的熔点为267-269℃,易溶于热水和醇。制备方法:以三(对氯苯基)甲醇(Ⅰ)为原料,与氰乙酸加成得β,β,β-三(对氯苯基)丙腈(Ⅱ),经浓硫酸水解得β,β,β-三(对氯苯基)丙酸(Ⅲ),再用五氯化磷酰氯化,得到β,β,β-三(对氯苯基)丙酰氯(Ⅳ),最后与N-甲基哌嗪缩合制得海涛林。用途:该品为治疗牛、羊矛形腔吸虫病的高效药物,具有作用强、驱虫率高(96%以上)、毒性低、适口性好等优点,国外畜牧业应用十分广泛。