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硅化鉭/硅化鉬基熱防護涂層短時高溫結(jié)構(gòu)演化
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航天材料及工藝研究所

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國家973計劃 (2015CB655200),國家自然科學(xué)基金(項目批準(zhǔn)號：51502069)


Microstructure evolution of TaSi2-MoSi2 based thermal protecting coatings with high emissivity
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Aerospace Research Institute of Materials and Processing Technology

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    摘要:

    本文以硅化鉭、硅化鉬、硼硅玻璃粉為原料,1200℃短時燒結(jié)制備了耐高溫?zé)岱雷o涂層。然后采用乙炔焰在1650℃燒蝕涂層2min,自然冷卻至室溫。利用X射線衍射、掃描電子顯微鏡和X射線電子能譜研究了該耐高溫?zé)岱雷o涂層在1650℃高溫加熱前后的涂層結(jié)構(gòu)和組分變化。結(jié)果顯示制備出的熱防護涂層表面為Ta2O5和少量TaSi2。經(jīng)過1650℃短時高溫?zé)g后,涂層表面燒蝕中心區(qū)形成大量片狀Ta2O5,該Ta2O5連成片。涂層截面形貌顯示高溫?zé)g后涂層接近表面部分發(fā)生致密化,厚度約23μm. 涂層截面的元素面掃描分析顯示截面上鉭、鉬元素分布均勻,即涂層具有良好的結(jié)構(gòu)均勻性。

    Abstract:

    A thermal protecting coating was prepared at 1200 ℃ using TaSi2, MoSi2, borosilicate glass powders as the starting materials. Subsequently the thermal protecting coating was heated at 1650℃ for 2 min and cooled naturally to room temperature. The microstructures and composition of the thermal protecting coating before and after heated at 1650℃ were measured by XRD, SEM and EDS. It is found that the surface of the as-prepared thermal protecting coating contained Ta2O5 and small amount of TaSi2. Lots of Ta2O5 sheets were formed in the heating center region of the coating surface after the heating of 1650℃. The section of the coating close to the surface became dense after heating at 1650℃, and the thickness of the dense section was about 23 μm. There is an even distribution for Ta and Mo elements in the element mapping of coating section, that is, the composition of the thermal protecting coating is uniformed.

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李俊峰,羅正平.硅化鉭/硅化鉬基熱防護涂層短時高溫結(jié)構(gòu)演化[J].稀有金屬材料與工程,2020,49(2):712~717.[Li Junfeng, Luo Zhengping. Microstructure evolution of TaSi2-MoSi2 based thermal protecting coatings with high emissivity[J]. Rare Metal Materials and Engineering,2020,49(2):712~717.]
DOI：10.12442/j. issn.1002-185X. QH20190016

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  • 收稿日期:2019-03-10
  • 最后修改日期:2019-04-28
  • 錄用日期:2019-10-23
  • 在線發(fā)布日期: 2020-03-12
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