Al_2O_3粉末对ZrO_2-TiB_2-Al_2O_3纳米复合陶瓷材料力学性能的影响

Effects of Al_2O_3 Powders of Mechanical Property of ZrO_2-TiB_2-Al_2O_3 Nanocomposite Ceramic Die Material

为了改善ZrO2陶瓷材料的综合力学性能,探讨了添加不同粒径和含量的Al2O3粉末对ZrO2-TiB2-Al2O3纳米复合陶瓷材料微观结构和力学性能的影响.采用真空热压烧结工艺制备了ZrO2纳米复合陶瓷材料,烧结温度为1 450℃,热压压力为30MPa,保温1h.结果表明:微米Al2O3粉末的体积分数为10%时,ZrO2-TiB2-Al2O3纳米复合陶瓷材料的抗弯强度最高,可达743MPa;添加纳米Al2O3粉末对材料的韧性提高明显,最高可达11.37MPa.m1/2,但不同粒径的Al2O3粉末对材料的硬度影响则不明显,材料的硬度随Al2O3含量的增加而增加.

To improve the comprehensive mechanical properties of ZrO2 ceramic die material,the effects of different particle size and content of Al2O3 powders on the microstructure and mechanical properties of ZrO2-TiB2-Al2O3 nanocomposite ceramic die materials were investigated.ZrO2 nanocomposite ceramic die material was prepared with vacuum hot pressing technique at 1 450 ℃ for 1 h.under 30 MPa.The results show that the highest flexural strength of ZrO2-TiB2-Al2O3 nanocomposite ceramic die material reaches 743.49 MPa with 10%（volume fraction） Al2O3 micrometer sized powders.The fracture toughness increased obviously along with the increase of Al2O3 nanometer sized powders,and reached 11.37 MPa·m1/2.Vickers hardness did not change obviously with different Al2O3 powders,while it greatly increased with the increases of Al2O3 content.