| SiB4 微粉在化学气相渗透SiC 过程中的变化 |
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| 引用本文： | 童长青,成来飞,曾庆丰,刘永胜,张立同.SiB4 微粉在化学气相渗透SiC 过程中的变化[J].宇航材料工艺,2010,40(3). |
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| 作者姓名： | 童长青 成来飞 曾庆丰 刘永胜 张立同 |
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| 作者单位： | 1. 西北工业大学超高温结构复合材料国家重点实验室,西安,710072;龙岩学院化学与材料学院,龙岩,364000
2. 西北工业大学超高温结构复合材料国家重点实验室,西安,710072 |
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| 基金项目： | 国家自然科学基金，国家杰出青年科学基金 |
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| 摘 要： | 采用SEM、EDS、XRD分析了SiB4微粉化学气相渗透(CVI)SiC后的组成和结构,并用热力学计算研究了SiB4微粉在CVI SiC过程中变化的原因。结果表明:在CVI SiC过程中SiB4微粉不发生分解,但在近表层处氧化生成SiO2和B2O3。用SiB4浆料浸渍结合CVI工艺对C/SiC基体进行自愈合改性时,难以形成均匀致密的基体。
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| 关 键 词： | SiB4微粉 化学气相渗透 氧化 |
Changes of SiB4 Powder During Process of Chemical Vapor Infiltration of SiC |
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| Tong Changqing,Cheng Laifei,Zeng Qingfeng,Liu Yongsheng,Zhang Litong.Changes of SiB4 Powder During Process of Chemical Vapor Infiltration of SiC[J].Aerospace Materials & Technology,2010,40(3). |
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| Authors: | Tong Changqing Cheng Laifei Zeng Qingfeng Liu Yongsheng Zhang Litong |
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| Institution: | National Key Laboratory of Thermostructure Composite Materials,Northwestern Polytechnical University |
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| Abstract: | The phase composition and microstructure of SiB4 powder during the process chemical vapor infiltration (CVI) of SiC were analyzed by EDS,SEM,XRD. Thermodynamic calculation was carried out in order to investigate the changes of SiB4 powder. The results show that the SiB4 particles do not decompose during CVI SiC process,but they are oxidized to form SiO2and B2O3 near the external surface of the specimen. Therefore, the matrix of C/ SiC composite modified by SiB4 particles,by using CVI combining with slurry infiltration processes,is not homogeneous and compact. The uneven oxidation makes it difficult to study the oxidation mechanism of C/ SiC-SiB4composite. |
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| Keywords: | SiC |
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