原位合成MoSi<sub>2</sub>-SiC复合材料700℃的氧化行为

doi:10.11901/1005.3093.2014.566

材料研究学报

2015, Vol. 29

Issue (8): 561-568 DOI: 10.11901/1005.3093.2014.566

本期目录 | 过刊浏览

原位合成MoSi₂-SiC复合材料700℃的氧化行为

张来启(

),段立辉,林均品

北京科技大学新金属材料国家重点实验室北京 100083

Oxidation Behavior of in-situ Synthesized MoSi₂-SiC Composites at 700℃

Laiqi ZHANG(

),Lihui DUAN,Junpin LIN

State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China

引用本文:

张来启,段立辉,林均品. 原位合成MoSi₂-SiC复合材料700℃的氧化行为[J]. 材料研究学报, 2015, 29(8): 561-568.
Laiqi ZHANG, Lihui DUAN, Junpin LIN. Oxidation Behavior of in-situ Synthesized MoSi₂-SiC Composites at 700℃[J]. Chinese Journal of Materials Research, 2015, 29(8): 561-568.

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摘要:

研究了不同SiC体积分数原位合成MoSi₂-SiC复合材料在700℃空气中1000 h的长期氧化行为。结果表明: 复合材料氧化1000 h后, 均未发生pest现象。复合材料的氧化抗力明显好于单一MoSi₂, 原位合成复合材料的氧化抗力好于传统的热压商用MoSi₂粉末和SiC粉末混合物制备的复合材料(外加复合材料)。复合材料氧化膜相组成仅为非晶SiO₂, 材料的氧化过程主要是O₂与MoSi₂的作用, SiC未发生氧化。材料在700℃下仍发生硅、钼的同时氧化, 因MoO₃的挥发较快没有晶须形成, 因而在材料表面快速形成一薄层连续、致密的非晶SiO₂保护膜, 使材料表现出优异的长期抗氧化性。

关键词 ：材料失效与保护, MoSi₂-SiC复合材料, 原位合成, 低温氧化行为, pest现象

Abstract：

The long-term air oxidation behavior of in situ synthesized composites MoSi₂-SiC with different volume fractions of SiC at 700 ℃ for 1000 h was investigated. The disintegration (pest) of the composites has not been observed after oxidation for 1000 h. The oxidation resistance of composites is significantly higher than that of monolithic MoSi₂. The in situ synthesized composite MoSi₂-30%SiC possesses higher oxidation resistance than the traditional composite with the same chemical composition fabricated by hot-pressing the mixture of commercial powders of MoSi₂ and SiC. The oxide scale formed on the prepared composite is only composed of amorphous silica, therefore, the oxidation reaction of the materials may mainly occur between MoSi₂ and O₂. Silicon and molybdenum may simultaneously be oxidized at 700℃ for the composite, however, due to the faster volatilization of MoO₃, thereby a thin continuous and dense amorphous SiO₂ protective scale is rapidly formed on the composite surface, so the composite exhibits excellent long-term oxidation resistance.

Key words： materials failure and protection MoSi₂-SiC composite synthesized in situ oxidation behavior at low temperature pest

收稿日期: 2014-10-08

基金资助:* 国家自然科学基金50871012和国家重点基础研究发展计划2011CB605502资助项目。

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https://www.cjmr.org/CN/10.11901/1005.3093.2014.566 或 https://www.cjmr.org/CN/Y2015/V29/I8/561

图1 6种材料样品在700℃氧化1000 h的动力学曲线及局部放大图

图2 WS、MS和MoSiC30 样品氧化1000 h后的XRD谱

图3 MS、MoSiC10、MoSiC30氧化膜表面Si2p、Mo3d、O1s的XPS窄谱图

表1 样品 MS、MoSiC10、MoSiC30的XPS分析结果

图4 6种材料样品在700℃氧化1000 h后表面的宏观形貌

图5 6种材料样品在700℃氧化1000 h后氧化膜表面的SEM像

图6 MoSi2-SiC复合材料700℃氧化机理示意图

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