摘要
以TiC和B4C为原料反应生成TiB2,原位合成了TiB2含量为20%的ZrO2/TiB2复合陶瓷材料。分析了烧结工艺中烧结温度、保温时间和烧结压力对力学性能的影响。结果表明:当烧结温度由1650℃提高到1750℃时,复合陶瓷材料的抗弯强度由820 MPa增加到980 MPa,断裂韧性从7.2 MPa.m1/2提高到9.4 MPa.m1/2;当烧结温度升至1850℃时,抗弯强度和断裂韧性下降;显微硬度随烧结温度的升高而提高。在烧结温度1750℃压力为30 MPa保温时间由30 min提高到45 min时,断裂韧性从8.6 MPa.m1/2提高到9.4 MPa.m1/2;保温时间增加至60 min时,断裂韧性下降;保温时间的变化对材料的抗弯强度、硬度影响不大。烧结压力对复合陶瓷材料的力学性能的影响较小。当烧结参数为1750℃、45 min、30 MPa,ZrO2/TiB2复合陶瓷材料的抗弯强度、显微硬度、断裂韧性分别达到980 MPa、13.6 GPa、9.4 MPa.m1/2。
TiB2 was fabricated using TiC and B4C as raw materials, ZrO2/TiB2 composite ceramic materials which content of TiB2 20wt% was fabricated by in-situ synthesis. Influence of sintering process on mechanical properties including temperature, holding time and pressure has been studied. The results show that the bending strength of the composite ceramic materials is improved from 820 MPa to 980 MPa, and its fracture toughness is improved from 7.2 MPa · m^1/2 to 9.4 MPa · m^1/2 when temperature raised from 1650 ℃ to 1750 ℃, the bending strength and its fracture toughness are decreased when temperature raised to 1850 ℃. Microhardness is improved when temperature raised. Its fracture toughness is improved from 8.6 MPa · m^1/2to 9.4 MPa · m^1/2 when holding time increased from 30 rain to 45 min at sintering temperature 1750 ℃ and pressure 30 MPa, but the fracture toughness is decreased when holding time increased to 60 min, and the holding time has little more influence on bending strength and microhardness. The experimental results show that bending strength, microhardness, fracture toughness of ZrO2/TiB2 composite is 980 MPa, 13.6 GPa, 9. 4 MPa· m^1/2 respectively trader the optinaun sintering condition including temperature of 1750 ℃, holding time of 45 min and pressure of 30 MPa.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2012年第4期1025-1029,共5页
Journal of Synthetic Crystals
基金
安徽省科技计划资助项目(10020203045)
安徽省高校自然科学研究资助项目(kj2010B132)
