以硼酸-尿素混合水溶液作为h-BN先驱体,对无压烧结制备的高纯h-BN陶瓷进行了浸渍-裂解-二次无压烧结处理,以提高其致密度和性能.研究了先驱体溶液浓度和循环次数对浸渍-裂解-烧结后h-BN陶瓷的显微结构及性能的影响.结果表明,随着先驱体溶液浓度的增大,h-BN陶瓷的密度、弯曲强度、断裂韧性和热导率均先升高后降低,浓度为68wt％时均达到最大.浓度过高会导致先驱体溶液在浸渍过程中发生析出,反而不利于浸渍.随着循环次数的增加,h-BN陶瓷的致密度、弯曲强度、断裂韧性及热导率均逐渐增大,但趋势逐渐变缓.循环6次得到的h-BN陶瓷的密度、弯曲强度、断裂韧性和热导率分别为1.465 g./cm3、84.1 MPa、1.52 MPa·m1/2、44.36 W·m-1·k-1,相对于未处理的h-BN陶瓷分别提高4.7％、31.6％、63.7％、31.2％.
参考文献
| [1] | Na-Na Long;Jian-Qiang Bi;Wei-Li Wang.Mechanical properties and microstructure of porous BN-SiO_2-Si_3N_4 composite ceramics[J].CERAMICS INTERNATIONAL,20123(3):2381-2387. |
| [2] | Jia-Xiang Xue;Ji-Xuan Liu;Bin-Huan Xie.Pressure-induced preferential grain growth, texture development and anisotropic properties of hot pressed hexagonal boron nitride ceramics[J].Scripta materialia,201111(11):966-969. |
| [3] | J. Ghosh;S. Mazumdar;M. Das;S. Ghatak;A.K. Basu.Microstmctural characterization of amorphous and nanocrystalline boron nitride prepared by high-energy ball milling[J].Materials Research Bulletin: An International Journal Reporting Research on Crystal Growth and Materials Preparation and Characterization,20084(4):1023-1031. |
| [4] | 张国军;邹冀;倪德伟;刘海涛;阚艳梅.硼化物陶瓷：烧结致密化、微结构调控与性能提升[J].无机材料学报,2012(3):225-233. |
| [5] | 陈广乐;彭珍珍;范仕刚;刘允超.热压烧结高纯hBN陶瓷材料及其致密性研究[J].硅酸盐通报,2010(2):436-439. |
| [6] | Ji-Xuan Liu;Yan-Mei Kan;Guo-Jun Zhang.Pressureless Sintering of Tantalum Carbide Ceramics without Additives[J].Journal of the American Ceramic Society,20102(2):370-373. |
| [7] | 雷玉成;包旭东;刘军;朱飞;张跃冰.液相烧结六方氮化硼陶瓷[J].江苏大学学报（自然科学版）,2005(4):357-360. |
| [8] | N. Ay;I. Tore.Pressureless Sintering of Hexagonal Boron Nitride Powders[J].Materials Science Forum,20070(0):207-212. |
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