Structure Dependence and Optimization of High Temperature Stress in Zirconia/Alumina Gradient Materials
CHEN Long1, LIANG Xinxing2, LIANG Baoqing2, WANG Yunjie1, WU Yuanting1, LIU Changqing3,*
1 Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Material Science and Engineering, Shaanxi University of Science & Technology, Xi’an 710021, China 2 Zhengzhou Fangming High Temperature Ceramic New Material Company Limited, Zhengzhou 452370, China 3 State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Abstract: Zirconia (ZrO2) materials are widely used in various glass furnaces due to its excellent mechanical properties and corrosion resistance to melt glass. However, because of their poor thermal shock resistance, ZrO2 materials are easy to crack and peel off, which influents the quality of the glass and shortens the service life of the furnace. To provide a material with excellent erosion resistance and thermal shock resistance for glass furnace, composition and structural parameters of the ZrO2-Al2O3 gradient material were optimized based on the analysis of stress field under high temperature by using finite element simulation. The ZrO2-Al2O3 gradient material was prepared using a pressureless sintering process. And the prepared materials show good mechanical properties, thermal shock resistance and erosion resistance. The results show that a high density ZrO2-Al2O3 gradient material without warping deformation can be produced by adopting a symmetrical structural design with high zirconium content layers on both sides and gradient layers in the middle. When the layer number of the ZrO2-Al2O3 gradient material is 5 and the gradient index is 0.9, the maximum equivalent thermal stress and maximum axial stress of the material are relatively small, and the stress gradient is the smallest. The bending strength of the material reaches 668 MPa. And the material possesses good anti-thermal shock properties. In addition, no obvious erosion layer or element diffusion at the surface of the sample can be observed after erosion experiment under 1 500 ℃.
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2025, Vol. 39 
