Effect of TiO<sub>2</sub> Sintering Assistant Addition and Sintering System on Sintering Densification Behavior of Chromium Oxide

YU Liqin; HAO Liucheng; YU Yang; WANG Yaxiang; WANG Zhongyu; WANG Bo; ZHAO Ye; CHEN Rui

doi:10.11973/jxgccl240171

Materials and Mechanical Engineering > 2024 > 48(10): 92-98. > DOI: 10.11973/jxgccl240171

YU Liqin, HAO Liucheng, YU Yang, WANG Yaxiang, WANG Zhongyu, WANG Bo, ZHAO Ye, CHEN Rui. Effect of TiO₂ Sintering Assistant Addition and Sintering System on Sintering Densification Behavior of Chromium Oxide[J]. Materials and Mechanical Engineering, 2024, 48(10): 92-98. DOI: 10.11973/jxgccl240171

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Effect of TiO₂ Sintering Assistant Addition and Sintering System on Sintering Densification Behavior of Chromium Oxide

1.
Pinggao Group Co., Ltd., Pingdingshan 467001, China
2.
State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China

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Received Date: April 01, 2024
Revised Date: September 16, 2024

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Abstract

Abstract

Cr₂O₃ material was prepared under different temperatures (1 000–1 500 °C) and different protective atmospheres (argon, nitrogen) by using Cr₂O₃ powder as raw material and TiO₂ powder as sintering assistant. The effect of TiO₂ addition (0, 1%, 3%, 5%, 5%, mass fraction), sintering temperature and sintering atmosphere on sintering densification behavior of Cr₂O₃ was analyzed. The results show that with the increase of TiO₂ addition, the linear shrinkage rate and relative density of the sample increased, and the densification degree increased. When the TiO₂ addition was 5%, the linear shrinkage rate and relative density reached the maximum, which were 16.25% and 92.51%, respectively. After adding TiO₂, (Cr_0.88Ti_0.12)₂O₃ replacement solid solution was formed to improve the diffusion mass transfer rate and promote sintering densification. With the increase of sintering temperature, the sintering densification degree of Cr₂O₃ first increased and then decreased, and reached the maximum at 1 300 °C. After sintering in nitrogen atmosphere, the Cr₂N film was formed on the surface of Cr₂O₃ particles after sintering in nitrogen, which could play a similar role to the liquid phase and improve the sintering speed, the Cr₂O₃ prepared was denser than that prepared in argon atmosphere.
- Cr₂O₃material,
- sintering assistant,
- sintering temperature

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References (23)

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