Effects of Sintering Temperature on Microstructure and Mechanical Properties of Pressureless Sintering Alumina Ceramics with Al2O3–SiO2–CaO Sintering Aids

IF 0.4 4区材料科学 Q4 MATERIALS SCIENCE, CERAMICS

Refractories and Industrial Ceramics Pub Date : 2023-12-11 DOI:10.1007/s11148-023-00816-y

Donghai Ding, Yue Guan, Guoqing Xiao, Zhaoyuan Mao, Xiaoqi Shi, Kaiqiang Gao, Xiaochuan Chong, Jiyuan Luo, Changkun Lei

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Abstract

The alumina ceramics with high compressive strength were prepared by pressureless sintering, and the kaolinite and calcium carbonate were added as Al₂O₃–SiO₂–CaO sintering aids. The effects of sintering temperature on the volume shrinkage, bulk density, water absorption and compressive strength of the alumina ceramics were studied. The phase composition, crystal cell parameters, average grain size and microstructure of the ceramic were analyzed by XRD, SEM and EDS. The results show that the lattice tends to packed with the increase of sintering temperature. The bonding between grains is the most compact after sintering at 1700°C. The volume shrinkage increases with the increase of sintering temperature. The water absorption of alumina ceramics after sintering at 1700°C reaches the minimum value of 0.06%. The bulk density and compressive strength increase first and then decrease with the increase of sintering temperature. At 1700°C, optimized mechanical properties of alumina ceramics is obtained, with a bulk density of 3.80 g/cm³ and a compressive strength of 1323 MPa.

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烧结温度对 Al2O3-SiO2-CaO 无压烧结氧化铝陶瓷微观结构和机械性能的影响

采用无压烧结法制备了高抗压强度氧化铝陶瓷，并添加了高岭石和碳酸钙作为 Al2O3-SiO2-CaO 烧结助剂。研究了烧结温度对氧化铝陶瓷体积收缩率、体积密度、吸水率和抗压强度的影响。通过 XRD、SEM 和 EDS 分析了陶瓷的相组成、晶胞参数、平均晶粒尺寸和微观结构。结果表明，随着烧结温度的升高，晶格趋于密实。在 1700°C 烧结后，晶粒间的结合最为紧密。体积收缩率随烧结温度的升高而增大。氧化铝陶瓷在 1700°C 烧结后的吸水率达到最小值 0.06%。随着烧结温度的升高，体积密度和抗压强度先增大后减小。在 1700°C 时，氧化铝陶瓷的机械性能达到最佳，体积密度为 3.80 g/cm3，抗压强度为 1323 MPa。

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来源期刊

$Refractories and Industrial Ceramics$

Refractories and Industrial Ceramics 工程技术-材料科学：硅酸盐

CiteScore

0.90

自引率

20.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Refractories and Industrial Ceramics publishes peer-reviewed articles on the latest developments and discoveries in the field of refractory materials and ceramics, focusing on the practical aspects of their production and use. Topics covered include: Scientific Research; Raw Materials; Production; Equipment; Heat Engineering; Applications.