Effects of particle size of raw materials on the characteristics of TiB2-SiC composites fabricated from B4C, TiC and Si powders
Effects of particle size of raw materials on the characteristics of TiB2-SiC composites fabricated from B4C, TiC and Si powders
复制标题
原料粒度对B4C、TiC和Si粉制备TiB2-SiC复合材料性能的影响
DOI：
10.1016/j.ceramint.2018.09.274
复制
发表时间：
2019
影响因子：
5.2
通讯作者：
Che Hongwei
中科院分区：
文献类型：
--
作者：
Zhang Xiaorong;Zhang Zhixiao;Liu Yuming;Wang Yanming;Fu Xiying;Bai Yongmei;Wang Guangshuo;Mu Jingbo;Zhang Xiaoliang;Che Hongwei
研究了原料（B4 C、TiC和Si粉）粒度对TiB 2-SiC复合粉末和陶瓷性能的影响。结果表明，B4 C和Si颗粒的尺寸对TiB 2和SiC颗粒的尺寸几乎没有影响，因为B4 C在TiB 2的形成过程中分解消耗，而Si在SiC的形成过程中熔化。SiC颗粒的尺寸在纳米和亚微米尺度内。而TiC颗粒的尺寸决定了复合陶瓷中TiB 2颗粒和TiB 2晶粒的尺寸，因为TiC颗粒是形成TiB 2颗粒的模板。从而影响了TiB 2-SiC复相陶瓷的显微结构和力学性能。采用纳米TiC粉末制备的TiB 2-SiC复合材料具有更小的晶粒尺寸、更好的韧性和更合理的裂纹扩展路径，从而获得最佳的力学性能（维氏硬度为30.2GPa，弯曲强度为732 MPa，断裂韧性为7.37MPa m1/2）。
We studied the effects of particle size of raw materials (B4C, TiC and Si powders) on the characteristics of both TiB2–SiC composite powders and ceramics. Results show that the size of B4C and Si particles hardly affects the size of TiB2and SiC particles because B4C is decomposed and consumed during the formation of TiB2, and Si is melted during the formation of SiC. The size of SiC particles is within the nano and submicron scale. However, the size of TiC particles determines the sizes of TiB2particles and TiB2grains in the composite ceramics because TiC particles serve as templates to form TiB2particles. Consequently, the microstructure and mechanical properties of the TiB2–SiC composite ceramics are affected. The TiB2–SiC composites fabricated using nano-sized TiC powder possess smaller grain size, better dispersibility and more reasonable crack propagation path, thereby obtaining the optimal mechanical properties (Vickers hardness of 30.2 GPa, flexural strength of 732 MPa and fracture toughness of 7.37 MPa m1/2).