Inhibiting crystallization mechanism of h-BN on α-cordierite in BN-MAS composites

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• 作者：Delong Cai ; Zhihua Yang ; ^{zhyang@hit.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Xiaoming Duan ; Peigang He ; Shengjin Wang ; Jingkun Yuan ; Jiancun Rao ; Dechang Jia ; ^{dcjia@hit.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yu Zhou
• 关键词：Hot pressing ; Liquid infiltration ; Ionic diffusion ; Interface structure ; Crystallization
• 刊名：Journal of the European Ceramic Society
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：36
• 期：3
• 页码：905-909
• 全文大小：1520 K

文摘

MAS-BN composites were prepared by hot pressed sintering. The phase transformation of magnesium aluminum silicate ceramic (MAS) was investigated with special attention to the inhibiting crystallization mechanism of h-BN. The resulting data suggest particular pathways for the inhibiting effect of h-BN on the crystallization of MAS. The nucleophilic attack of N on M (M = Mg²⁺, Al³⁺ and Si⁴⁺) and electrophilic attack of B on O are the crucial factors for the formation of amorphous MAS phase. In addition, a chemical bonding formed between h-BN and MAS and the atoms of the matrix diffuse into the h-BN layer, leading to a strong bonding interface.