TiB_2含量和烧结温度对B_4C/Al_2O_3基复合陶瓷的影响  

Effect of TiB_2 content and sintering temperature on microstructure and properties of B_4C/Al_2O_3 matrix ceramic composites

作　　者：刘长霞[1] 孙军龙[1] 

机构地区：[1]鲁东大学先进制造与自动化技术重点实验室,山东烟台264025

出　　处：《材料热处理学报》2013年第8期6-10,共5页Transactions of Materials and Heat Treatment

基　　金：山东省自然科学基金高校联合专项资助项目(ZR2011EL026);山东省优秀中青年科学家科研奖励基金(No.BS2012ZZ002)

摘　　要：利用原位反应热压工艺制备了B4C/Al2O3基复合陶瓷,研究了TiB2含量和烧结温度对B4C/Al2O3基复合陶瓷力学性能和微观结构的影响。结果表明,当TiB2含量低于8.7%时,随原位反应生成的TiB2含量的增加,有效的促进了B4C/Al2O3/TiB2复合陶瓷的烧结,提高相对密度,改善了力学性能。当烧结温度低于1900℃时,其力学性能随烧结温度增加而提高;当超过1900℃时,其力学性能随烧结温度的提高而降低。在1900℃,60 min时,B4C/Al2O3/TiB2复合陶瓷获得最佳综合力学性能,其硬度、断裂韧性和抗弯强度分别为24.8 GPa、4.82 MPa.m1/2和445.2 MPa。Abstract：B4C/Al2O3 matrix ceramic composites were fabricated by in-situ hot-pressing technology. The effect of TiB2 content, which formed by in-situ reaction, and sintering temperature on mechanical properties and microstructure of the B4C/Al2O3 ceramic composites was researched. Results show the sintering densifieation and mechanical properties of the composites are improved with the increase of TiB2 content. The mechanical properties increased with increasing the sintering temperature as the sintering temperature is lower than 1900 ℃. The optimum properties of B4C/AI203 matrix ceramics with 8.7% TiB2 are obtained when the composite is sintered at temperature of 1900 ℃ and soaking time of 60 min. The hardness, fracture toughness and bending strength of the composite are 24.8 GPa, 4. 82 MPa- i/2 and 445.2 MPa, respectively.

关 键 词：B4C TIB2 AL2O3 烧结温度 

分 类 号：TQ174.75[化学工程—陶瓷工业]