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鈮合金表面MoSi2-B4C復(fù)合涂層的快速燒結(jié)制備及高溫氧化行為
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中國礦業(yè)大學(xué) 材料與物理學(xué)院 江蘇 徐州 221116

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國家重點(diǎn)研發(fā)計(jì)劃(2018YFB2001204),國家自然科學(xué)基金資助(51601219)


Rapid sintering and high temperature oxidation behavior of MoSi2-B4C composite coatings on Nb alloy
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China University of Mining and Technology,School of Material Science and Physics,Xuzhou

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    摘要:

    以Mo-Si-B4C混合粉末為涂層原料,采用放電等離子燒結(jié)在鈮合金表面原位反應(yīng)燒結(jié)制備MoSi2-B4C復(fù)合涂層,研究涂層組織形成過程及界面反應(yīng)特征,考察涂層在1450℃下的抗氧化性能。結(jié)果表明,在燒結(jié)的升溫階段,MoSi2相就已完全形成,而在保溫的初期階段,部分B4C顆粒又與鄰近的MoSi2反應(yīng)生成了SiC和Mo2B5。燒結(jié)過程中,涂層中的Si和B向基體合金擴(kuò)散,形成了由NbSi2 + NbB外層和Nb5Si3內(nèi)層組成的互擴(kuò)散區(qū)。涂層在1450℃至少100h內(nèi)可有效保護(hù)基體,表面生成了致密的SiO2-B2O3氧化膜,而互擴(kuò)散區(qū)內(nèi)NbB的存在有效阻礙了氧化過程涂層中Si的內(nèi)擴(kuò)散。

    Abstract:

    MoSi2-B4C composite coatings were prepared on Nb alloy by spark plasma sintering process. Pure Mo, Si and B4C powders were used as the coating starting materials. The microstructure formation process and interface reaction characteristics of the coatings during SPS were studied. The oxidation resistance of the coatings at 1450℃ was investigated. The results showed that the MoSi2 phase formed completely in the coatings during the heating stage of sintering, and the B4C particles reacted with the neighboring MoSi2 to form SiC and Mo2B5 at the initial stage of holding time. During the sintering process, elements Si and B diffused inwardly from the coatings to the Nb substrate, forming an interdiffusion zone composed of NbSi2+ NbB outer layer and Nb5Si3 inner layer. The coatings could protect Nb alloy effectively from oxidation at 1450℃ for at least 100h, and dense SiO2-B2O3 oxide scales were formed on the surfaces of the coatings. The presence of NbB in the interdiffusion zone effectively impeded the inward diffusion of Si in the coating during the oxidation process.

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張平,柯凱旋,陳成龍,陳正,任宣儒,馮培忠.鈮合金表面MoSi2-B4C復(fù)合涂層的快速燒結(jié)制備及高溫氧化行為[J].稀有金屬材料與工程,2022,51(3):997~1002.[Zhang Ping, Ke Kaixuan, Chen Chenglong, Chen Zheng, Ren Xuanru, Fei Peizhong. Rapid sintering and high temperature oxidation behavior of MoSi2-B4C composite coatings on Nb alloy[J]. Rare Metal Materials and Engineering,2022,51(3):997~1002.]
DOI：10.12442/j. issn.1002-185X.20210258

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  • 收稿日期:2021-03-24
  • 最后修改日期:2021-07-02
  • 錄用日期:2021-07-09
  • 在線發(fā)布日期: 2022-04-06
  • 出版日期: 2022-03-30