ZrO2/Al2O3多孔陶瓷的制备与力学性能

doi:10.11868/j.issn.1001-4381.2019.001040

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摘要

采用凝胶-发泡法制备了ZrO₂/Al₂O₃多孔陶瓷，研究了陶瓷浆料的流变性，固相含量对多孔陶瓷坯体显微结构与力学性能的影响，以及烧结助剂MgO含量与多孔陶瓷抗压强度及气孔率之间的关系。结果表明，在分散剂含量为0.4%(质量分数)，球磨4 h，pH值为4的条件下，陶瓷浆料的黏度较低，有利于凝胶注模。固相含量增加，坯体气孔率下降。过高的固相含量使浆料流动困难，注模时引入空气导致坯体内形成较大的气孔甚至裂纹，使坯体抗压强度下降。由ZrO₂引起的相变增韧及微裂纹增韧可有效改善多孔陶瓷的力学性能。随烧结助剂含量增加，多孔陶瓷气孔支撑体致密化程度增大，气孔率降低，抗压强度明显升高。多孔陶瓷的抗压强度最高达30 MPa。引入适量的ZrO₂及烧结助剂，可制备气孔率适中、抗压强度高的多孔陶瓷。

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关键词 ： ZrO₂/Al₂O₃多孔陶瓷, 凝胶-发泡法, 烧结助剂, 气孔率, 力学性能

Abstract：

ZrO₂/Al₂O₃porous ceramics were prepared by gel-foaming technique. The rheological property of slurry, the effect of solid content on the microstructure and mechanical property of the porous green bodies and the relationship between the MgO sintering additive content with the compressive strength and porosity of porous ceramics were investigated. The results show when the dispersant content is 0.4%(mass fraction), ball milling time is 4 h and the pH value is 4, the low viscosity is conductive to gelcasting. The porosity of green body reduces with the increase of solid content. The excessive solid content makes the slurry hard to flow, and the big pores and cracks form during gelcasting process, then the compressive strength of green body decreases. The mechanical properties of porous ceramics are improved with the phase transformation and micro-crack toughening induced by the ZrO₂. The densification of pore supports increases, the porosity reduces and compressive strength increases with the increase of sintering additive content. The highest compressive strength is 30 MPa. The porous ceramics with appropriate porosity and high compressive strength can be prepared by introducing suitable contents of ZrO₂ and sintering additive.

Key words： ZrO₂/Al₂O₃porous ceramic gel-foaming sintering additive porosity mechanical property

收稿日期: 2019-11-13 出版日期: 2021-05-21

中图分类号:

TQ174.1

基金资助:黑龙江省大学生创新训练计划项目(201910214124)

通讯作者: 何秀兰 E-mail: hexiulan@hrbust.edu.cn

作者简介: 何秀兰(1973-), 女, 副教授, 博士, 研究方向: 陶瓷材料, 联系地址: 黑龙江省哈尔滨市香坊区林园路4号哈尔滨理工大学(南区)材料学院317(150040), hexiulan@hrbust.edu.cn

引用本文:

蒋浩然, 林硕, 张康飞, 王海燕, 王佳齐, 何秀兰. ZrO₂/Al₂O₃多孔陶瓷的制备与力学性能[J]. 材料工程, 2021, 49(5): 157-162.
Hao-ran JIANG, Shuo LIN, Kang-fei ZHANG, Hai-yan WANG, Jia-qi WANG, Xiu-lan HE. Preparation and mechanical properties of ZrO₂/Al₂O₃ porous ceramics. Journal of Materials Engineering, 2021, 49(5): 157-162.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2019.001040 或 http://jme.biam.ac.cn/CN/Y2021/V49/I5/157

Fig.1 不同固相含量的ZrO₂/Al₂O₃浆料黏度与pH值之间的关系

Table 1 不同分散剂含量的ZrO₂/Al₂O₃陶瓷浆料黏度

Table 2 不同球磨时间的ZrO₂/Al₂O₃陶瓷浆料黏度

Fig.2 ZrO₂/Al₂O₃多孔陶瓷的XRD图谱

Fig.3 不同固相含量的ZrO₂/Al₂O₃多孔陶瓷坯体的SEM形貌图
(a)15%；(b)25%；(c)30%

Fig.4 不同固相含量的ZrO₂/Al₂O₃多孔陶瓷气孔支撑体的SEM形貌图
(a)15%；(b)25%；(c)30%

Fig.5 不同烧结助剂含量的ZrO₂/Al₂O₃多孔陶瓷SEM形貌图
(a)1%；(b)3%；(c)5%

Fig.6 不同固相含量的ZrO₂/Al₂O₃多孔陶瓷坯体的气孔率和抗压强度

Fig.7 不同烧结助剂含量的ZrO₂/Al₂O₃多孔陶瓷的气孔率和抗压强度

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