Ion sputtering erosion mechanisms of h-BN composite ceramics with textured microstructures

被引：0
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作者：
Duan, Xiaoming [1 ]
Ding, Yongjie [2 ]
Jia, Dechang [1 ]
Jing, Nan [1 ]
Yang, Zhihua [1 ]
He, Peigang [1 ]
Tian, Zhuo [1 ]
Wang, Shengjin [1 ]
Wang, Yujin [1 ]
Zhou, Yu [1 ]
Yu, Daren [2 ]
机构：
[1] Duan, Xiaoming
[2] Ding, Yongjie
[3] Jia, Dechang
[4] Jing, Nan
[5] Yang, Zhihua
[6] He, Peigang
[7] Tian, Zhuo
[8] Wang, Shengjin
[9] Wang, Yujin
[10] Zhou, Yu
[11] Yu, Daren
来源：
Duan, X. (dxm_hit@126.com) | 1600年 / Elsevier Ltd卷 / 613期
基金：
中国国家自然科学基金;
关键词：
Since the hexagonal boron nitride (h-BN) grain shows typical lamellar structures; textured materials can be obtained by arranging h-BN grains along one direction. In this work; textured h-BN composite ceramics with the c-axis orientation arranged along the pressure direction are manufactured by hot-press sintering using mullite as the sintering additive. The results show that sintering pressures not only play a major role in the density and the textured degrees of composite ceramics; but also influence Xe ion erosion resistance performances. After Xe ion sputtering; compositions of both h-BN and mullite stay stable; while the elemental compositions have changed due to the so-called preferential sputtering. Sputtered surfaces along different orientations show diverse morphologies attributed to the textured microstructures. The erosion mechanisms of h-BN grains during Xe ion sputtering are breaking of B-N bonds and delamination of BN layers. While the mass loss of composite ceramics is due to the erosion of h-BN grains and mullite coupled with partial detachment of h-BN grains from the surface. © 2014 Elsevier Inc. All rights reserved;
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Journal article (JA)
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