Effect of micron aluminium powder on mechanical properties and microstructural in zirconia toughened alumina ceramics

Micro & nano letters

article

Ruihao Zhang¹  Bao Qi²  Jie Wang¹  Xinwei She¹  Zhende Ran²  Xianquan Jiang¹ 

[1] School of Materials and Energy, Southwest University;Southwest Aluminum (Group) Co., Ltd

关键词: zirconium compounds;    sintering;    aluminium;    ball milling;    ceramics;    powders;    bending strength;    powder metallurgy;    porosity;    alumina;    grain size;    particle reinforced composites;    solid-state phase transformations;    intragranular ZrO2;    micron aluminium powder;    sintering temperature;    monoclinic ZrO2;    powder metallurgy;    alumina–zirconia–aluminium ceramics;    flexural strength;    intragranular phase;    grain size;    porosity;    zirconia toughened alumina ceramics;    bending strength;    t–m phase transformation;    ball milling;    temperature 1650.0 degC;    temperature 1600.0 degC;    Al2O3-ZrO2-Al;   

DOI  :  10.1049/mnl.2020.0053

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

Traditional powder metallurgy was employed to prepare alumina–zirconia (Al 2 O 3 –ZrO 2 ) and alumina–zirconia–aluminium (Al 2 O 3 –ZrO 2 –Al) ceramics. It was found that as the sintering temperature increases, the flexural strength of both ceramics increases first and then decreases. The maximum flexural strength of Al 2 O 3 –ZrO 2 appears to be 430.7 MPa when sintered at 1650°C, and Al 2 O 3 –ZrO 2 –Al appears to be 448.8 MPa when sintered at 1600°C. As the sintering temperature increases, the grain size of each phase grows up, the porosity increases, the content of intragranular phase and monoclinic ZrO 2 (m-ZrO 2 ) increases. The addition of Al powder improves the dispersion of ZrO 2 , reduces the porosity of zirconia toughened alumina ceramics, and improves the bending strength. Al powder increases the content of the intragranular ZrO 2 , restrains the t–m phase transformation, results in the decreases of the relative amount of m-ZrO 2 in ZrO 2 ( X m ). Adding Al powder during ball milling is a simple method to increase the content of intragranular ZrO 2 in Al 2 O 3 –ZrO 2 ceramics.

【 授权许可】

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