等离子喷涂制备ZrB2-MoSi2复合涂层及其抗氧化性能

doi:10.15541/jim20140389

摘要/Abstract

摘要： 采用喷雾干燥与真空烧结技术制备出不同MoSi₂含量的ZrB₂-MoSi₂球形团聚粉末, 并以平均粒径为30 μm的ZrB₂-MoSi₂团聚粉末为原料, 利用大气等离子喷涂法在C/C复合材料表面制备包覆完整的ZrB₂-MoSi₂复合涂层, 借助XRD、SEM等对涂层的组织结构以及涂层的抗氧化性能进行了研究。结果表明: ZrB₂-MoSi₂涂层结构均匀致密, 结合强度达到7.2 MPa。适当含量的MoSi₂, 可以提高涂层的抗高温氧化性能; ZrB₂-40wt%MoSi₂涂层C/C复合材料试样在1500℃静态空气中氧化9 h, 失重率仅为1.7%, 涂层具有良好的自愈合能力, 表现出优异的抗高温氧化性能。

关键词: 喷雾干燥, C/C复合材料, ZrB2-MoSi2复合涂层, 等离子喷涂, 抗氧化性能

Abstract:

Agglomerated ZrB₂-MoSi₂ composite powders with different contents of MoSi₂ were successfully prepared by spray drying and vacuum sintering. Then ZrB₂-MoSi₂ composite coatings were deposited on C/C composites by atmospheric plasma spraying (APS) using ZrB₂-MoSi₂ composite powders with average size of 30 μm as raw material. The microstructure and anti-oxidation performance of coatings were characterized by XRD, SEM, etc. It could be found out that the microstructure of ZrB₂-MoSi₂ composite coatings was dense with bonding strength up to 7.2 MPa. And oxidation-resistance of composite coating at high temperature could be improved by appropriate addition of MoSi₂. The weight loss of C/C composites coated by ZrB₂-40wt%MoSi₂ coating was only 1.7% after 9 h in air at 1500℃. The coating exhibited good self-sealing performance and excellent anti-oxidation ability.

Key words: spraying drying, C/C composite, ZrB2-MoSi2 composite coatings, atmospheric plasma spraying, anti-oxidation performance

中图分类号:

TB332

毛金元, 刘敏, 毛杰, 邓春明, 曾德长, 徐林. 等离子喷涂制备ZrB₂-MoSi₂复合涂层及其抗氧化性能[J]. 无机材料学报, 2015, 30(3): 282-286.

MAO Jin-Yuan, LIU Min, MAO Jie, DENG Chun-Min, ZENG De-Chang, XU Lin. Oxidation-resistance of ZrB₂-MoSi₂ Composite Coatings Prepared by Atmospheric Plasma Spraying[J]. Journal of Inorganic Materials, 2015, 30(3): 282-286.

图/表 9

图1 ZrB2 (a)和MoSi2 (b)粉末原料微观形貌

Fig. 1 Morphologies of ZrB2 (a) and MoSi2 (b) starting materials

图2 ZrB2-MoSi2球形团聚粉末SEM照片

Fig. 2 Morphologies of agglomerated ZrB2-MoSi2 composite powders at low magnification (a); and high magnification of single powder (b)

表1 大气等离子喷涂ZrB2-MoSi2涂层工艺参数

Table 1 APS parameters for ZrB2-MoSi2 coatings

Current/A	Voltage/V	Flux of Ar/ (L·min^-1)	Flux of H₂/ (L·min^-1)	Powder feed rate/ (g·min^-1)	Distance/mm
700	75	40	11	7	110

图3 喷涂态ZrB2-MoSi2复合涂层的XRD图谱

Fig. 3 XRD patterns of as-sprayed ZrB2-MoSi2 composite coatings

图4 ZrB2-MoSi2复合涂层的抛光截面SEM照片

Fig. 4 Polished cross-section morphologies of as-sprayed ZrB2-MoSi2 composites coatings (a ) ZM30; (b) ZM40; (c) ZM50

图5 ZrB2-MoSi2涂层包覆C/C复合材料在1500℃下氧化动力曲线

Fig. 5 Isothermal oxidation curves of ZrB2-MoSi2 coated C/C composites at 1500℃ in air

图6 ZrB2-MoSi2复合涂层在1500℃氧化9 h后XRD图谱

Fig. 6 XRD patterns of ZrB2-MoSi2 composites coatings after oxidation at 1500℃ in air for 9 h

图7 ZrB2-MoSi2复合涂层在1500℃氧化9 h后的断口SEM照片

Fig. 7 SEM images of fracture surfaces of ZrB2-MoSi2 composites coatings after oxidation at 1500℃ for 9 h (a) ZM30; (b) ZM40; (c) ZM50

图8 ZrB2-MoSi2复合涂层在1500℃氧化9 h后的表面SEM照片与能谱图

Fig. 8 Surface morphologies and EDS analysis of ZrB2-MoSi2 composites coatings after oxidation at 1500℃ for 9 h (a) ZM30; (b) ZM40; (c) ZM50

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等离子喷涂制备ZrB₂-MoSi₂复合涂层及其抗氧化性能

Oxidation-resistance of ZrB₂-MoSi₂ Composite Coatings Prepared by Atmospheric Plasma Spraying

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