Effects of Y2O3 Doping on Sintering Properties and Microstructure of CaTiO3 Ceramics

AN Di; LUO Xudong; LIU Pengcheng; XIE Zhipeng; LI Ting

doi:10.11973/jxgccl201804012

Materials and Mechanical Engineering > 2018 > 42(4): 53-57. > DOI: 10.11973/jxgccl201804012

AN Di, LUO Xudong, LIU Pengcheng, XIE Zhipeng, LI Ting. Effects of Y₂O₃ Doping on Sintering Properties and Microstructure of CaTiO₃ Ceramics[J]. Materials and Mechanical Engineering, 2018, 42(4): 53-57. DOI: 10.11973/jxgccl201804012

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Effects of Y₂O₃ Doping on Sintering Properties and Microstructure of CaTiO₃ Ceramics

1. School of High Temperature Materials and Magnesium Resource Engineering, University of Science and Technology Liaoning, Anshan 114051, China;
2. Jiangsu Zhonglei Energy-Save and Technology Development Co., Ltd., Dongtai 224213, China;
3. State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

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Received Date: July 25, 2017
Revised Date: February 24, 2018

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Abstract

CaTiO₃ ceramics were prepared at 1 300,1 400℃ for 3 h with CaO and TiO₂ as raw materials and being doped with 0, 1wt%, 2wt%, 3wt%, and 4wt% Y₂O₃. The effects of Y₂O₃ doping amount and sintering temperature on the phase composition, crystal structure, sintering properties and microstructure of the ceramics were investigated. The results show that the cell volume of CaTiO₃ first increased and then decreased with increasing Y₂O₃ doping amount. The substitution of Y³⁺ for Ti⁴⁺ increased the cell volume of CaTiO₃ while the substitution of Y³⁺ for Ca²⁺ reduced the cell volume. With the increase of Y₂O₃ doping amount or the rise of sintering temperature, both the sintering linear shrinkage rate and the bulk density of the ceramics increased. With the increase of Y₂O₃ doping amount, the microstructure of the ceramics became denser, the size of CaTiO₃ grains first increased and then decreased, and the grain shape changed from step-like morphology to regular polygons.
- Y₂O₃,
- CaTiO₃ ceramics,
- solid phase reaction,
- sintering property,
- microstructure

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