采用尿素与硼酸的反应, 在850℃氮气氛下, 合成了纳米BN?包裹的AlN粉料, 通过TEM观察, BN粒径为20～30nm. 通过热压烧结制备出纳米h-BN包裹的AlN/BN
复相陶瓷, SEM/TEM观察, h-BN呈细针状, 针长100～400nm, 针宽为30～50nm. 当h-BN含量≥20wt%时, 其硬度显著降低, 提高了材料的可加工性能.
The AlN/h-BN nanocomposite powders were prepared through the reaction of AlN powder, H3BO3, and CO(NH2)2 in nitrogen atmosphere at
850℃. TEM observation shows that the average particle diameter of BN is about 20～30nm. The AlN/BN ceramic composites were synthesized
by hot-pressing. SEM/TEM observation shows that the BN particles are thin pin-shaped with 100～400nm pin-length and 30～50nm pin-width. The
hardness of the composites decreases obviously and the machinable property increases when the BN content is more than 20wt%.
参考文献
| [1] | Ohji T, Jeong Y K, Niihara K, et al. J. Am. Ceram. Soc., 1998, 81 (6): 1453-1460. [2] Li Jingguo, Gao Lian, et al. J. Mater. Chem., 2003, 13 (3): 628-630. [3] Suganuma K, Sasaki G, Fujuta T, et al. J. Mater. Sci., 1993, 28 (5): 1175-1181. [4] 叶乃清, 曾照强, 胡晓清, 等(YE Nai-Qing, et al)．硅酸盐学报(Journal of the Chinese Ceramic Society), 1998, 26 (2): 265-269. [5] Kanai T, Tanemoto K, Kubo H. Jpn. J. Appl. Phys., 1993, 32 (8): 3544-3548. [6] Wang Xiangdong, Qiao Guanjun, Jin Zhihao Jin. J. Am. Ceram. Soc., 2004, 87 (4): 565-570. |
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