摘要
氧化锆陶瓷因具备优异的力学性能和抗玻璃液侵蚀性,被广泛应用于各类玻璃窑炉,但是其抗热震性较差,容易开裂和剥落,影响了玻璃窑炉的寿命及玻璃品质。为了获得兼具优异抗侵蚀性与抗热震性的玻璃熔池用氧化锆材料,本工作通过对ZrO_(2)-Al_(2)O_(3)梯度材料工作温度下的应力场进行有限元分析,对梯度材料的组成与结构进行了优化设计,并结合无压烧结工艺制备得到了具有优异的力学性能、抗侵蚀性能和抗热震性能的ZrO_(2)-Al_(2)O_(3)梯度材料。结果表明:采用对称的结构设计,两侧为高锆层,中间为梯度层,可制得无翘曲变形的高致密ZrO_(2)-Al_(2)O_(3)梯度材料。当ZrO_(2)-Al_(2)O_(3)梯度材料层数为5、成分指数n为0.9时,梯度材料的最大等效热应力和最大轴向应力较小,应力梯度最小;梯度材料的抗弯强度达到668 MPa,且具有优异的抗热震性能;经1 500℃的玻璃液侵蚀实验,样品表面未出现明显的侵蚀层和元素扩散。
Zirconia (ZrO_(2)) 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, ZrO_(2) 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 ZrO_(2)-Al_(2)O_(3) gradient material were optimized based on the analysis of stress field under high temperature by using finite element simulation. The ZrO_(2)-Al_(2)O_(3) 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 ZrO_(2)-Al_(2)O_(3) 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 ZrO_(2)-Al_(2)O_(3) 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 ℃.
作者
陈龙
梁新星
梁保青
王云杰
伍媛婷
刘长青
CHEN Long;LIANG Xinxing;LIANG Baoqing;WANG Yunjie;WU Yuanting;LIU Changqing(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;Zhengzhou Fangming High Temperature Ceramic New Material Company Limited,Zhengzhou 452370,China;State Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《材料导报》
北大核心
2025年第12期67-73,共7页
Materials Reports
基金
国家自然科学基金(51702194,52173214)
陕西省自然科学基金(2023-JC-YB-384)
陕西高校青年创新团队(2022-70)。
关键词
氧化锆
梯度材料
有限元分析
抗侵蚀性
抗热震性
ZrO_(2)
graded materials
finite element simulation
erosion resistance
thermal shock resistance
