Formation of Polytypoids (12H and 21R) in High Temperature Nitrogen Atmosphere and Their Effects on SiC-MgAl2O4 Composites

doi:10.19691/j.cnki.1004-4493.2023.02.009

China's Refractories ›› 2023, Vol. 32 ›› Issue (2): 45-50.DOI: 10.19691/j.cnki.1004-4493.2023.02.009

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Formation of Polytypoids (12H and 21R) in High Temperature Nitrogen Atmosphere and Their Effects on SiC-MgAl₂O₄ Composites

GU Chenwei, WANG Zhanmin^*, ZHAO Shixian, SI Yaochen, XIA Miao

State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Luoyang 471039, China

Online:2023-06-15 Published:2023-06-19
Contact: *e-mail: wangzm@lirrc.com
About author:Gu Chenwei, born in 1997, graduated from Sinosteel Luoyang Institute of Refractories Research Co., Ltd. in 2022. Since then, he has been working in the Engineering Technology Division of the same institute.

Abstract

Abstract: SiC-MgAl₂O₄ composites with SiAlON polytypoids (12H and 21R) as the bonding phases were prepared using SiC fine powder, MgAl₂O₄ fine powder and Al powder as raw materials. The effects of the firing temperature and the mass ratio of SiC to MgAl₂O₄ on the formation of SiAlON polytypoids as well as on the properties of samples were studied. The formation mechanism of SiAlON polytypoids was discussed. The results show that firing at 1 650 ℃ in the nitrogen atmosphere, SiC-MgAl₂O₄ composites with SiAlON polytypoids can be obtained. With the gradual increase of the mass ratio of SiC to MgAl₂O₄ in the raw materials, 12H forms first, and then coexists with 21H, finally, all 12H converts into 21R in samples. Both phases are plate crystals with flat and smooth edges. Compared with 21R, 12H is conducive to improving the density and the cold mechanical properties of materials. After firing at 1 650 ℃ in the nitrogen atmosphere, with the mass ratio of SiC to MgAl₂O₄ of 6:4, the sample has the cold modulus of rupture of 27 MPa, showing the optimal performance.

Key words: silicon carbide, MgAl₂O₄, silicon carbide-MgAl₂O₄ composites, SiAlON polytypoids, 12H, 21R

GU Chenwei, WANG Zhanmin, ZHAO Shixian, SI Yaochen, XIA Miao. Formation of Polytypoids (12H and 21R) in High Temperature Nitrogen Atmosphere and Their Effects on SiC-MgAl₂O₄ Composites[J]. China's Refractories, 2023, 32(2): 45-50.

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Formation of Polytypoids (12H and 21R) in High Temperature Nitrogen Atmosphere and Their Effects on SiC-MgAl₂O₄ Composites

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