PIP工艺制备C/Zr_(0.5)Hf_(0.5)C-SiC复合材料及其微观结构和弯曲性能
Preparation of C/Zr_(0.5)Hf_(0.5)C-SiC composite by PIP process and its microstructure and flexural properties
查看参考文献17篇
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文摘
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基于自制Zr_(0.5)Hf_(0.5)C先驱体和商业化液态聚碳硅烷,通过先驱体浸渍裂解(PIP)工艺成功制备C/Zr_(0.5)Hf_(0.5)C-SiC复合材料,研究纤维表面热解C涂层厚度对复合材料微观结构及弯曲性能的影响。结果表明:自制Zr_(0.5)Hf_(0.5)C先驱体在1400℃下即可转化生成单一Zr_(0.5)Hf_(0.5)C固溶体。因具有良好的渗透性,转化生成的Zr_(0.5)Hf_(0.5)C基体同时存在于C/Zr_(0.5)Hf_(0.5)C-SiC复合材料的纤维束内和束间,呈包裹SiC基体的层状形貌。C/Zr_(0.5)Hf_(0.5)C-SiC复合材料主要由C,SiC和Zr_(0.5)Hf_(0.5)C相组成;具有不同热解C涂层厚度(0.67,0.84,1.36μm)的3组复合材料密度分别为2.07,1.99,1.98 g/cm~3;随热解C涂层厚度的增加复合材料中SiC含量减少。弯曲加载中3组不同热解C涂层厚度复合材料均呈现假塑性断裂模式,弯曲强度,弯曲模量和断裂韧度分别在410 MPa, 60 GPa和15.6 MPa·m~(1/2)以上。良好的界面结合和预先引入的SiC基体是C/Zr_(0.5)Hf_(0.5)C-SiC复合材料获得优良弯曲性能的关键。 |
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其他语种文摘
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Based on the self-made Zr_(0.5)Hf_(0.5)C precursor and commercial liquid polycarbosilane, C/Zr_(0.5)Hf_(0.5)C-SiC composite was successfully prepared by the precursor impregnation and pyrolysis (PIP) process. The influence of the thickness of pyrolytic C coating on the structure and bending properties of composite materials was studied. The results show that the self-made Zr_(0.5)Hf_(0.5)C precursor can be converted into Zr_(0.5)Hf_(0.5) C solid solution at a relatively low temperature of 1400℃. Because of its good permeability, the transformed Zr_(0.5)Hf_(0.5)C matrix exists in both the inter-bundle and intra-bundle regions of the C/Zr_(0.5)Hf_(0.5)C-SiC composite,which presents as a layered structure on SiC matrix. The phase composition of C/Zr_(0.5)Hf_(0.5) C-SiC composite mainly includes C,SiC and Zr_(0.5)Hf_(0.5) C. The densities of three groups of composites with different thicknesses of pyrolytic C coating (0.67,0.84, 1.36 µm) are 2.07,1.99,1.98 g/cm~3,respectively. SiC content in the composite decreases with the increase of the thickness of pyrolytic C coating. The three groups of composites with different thicknesses show pseudoplastic fracture mode during bending loading tests,bending strength, bending modulus and fracture toughness are above 410 MPa,60 GPa and 15.6 MPa·m~(1/2),respectively. Good interface bonding and pre-introduced SiC matrix are the keys to obtaining excellent bending properties of C/Zr_(0.5)Hf_(0.5)C-SiC composites. |
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来源
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材料工程
,2023,51(8):155-161 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2023.000151
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关键词
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Zr_(0.5)Hf_(0.5)C
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超高温陶瓷
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先驱体浸渍裂解
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微观结构
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弯曲性能
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地址
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1.
国防科技大学空天科学学院, 长沙, 410073
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中国人民解放军96901部队31分队, 北京, 100094
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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一般工业技术 |
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文献收藏号
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CSCD:7629460
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