等温化学气相渗透法制备C/C-SiC复合材料的摩擦磨损性能
Tribological Property of C/C - SiC Composites Fabricated by Isothermal Chemical Vapor Infiltration
查看参考文献16篇
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文摘
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以碳纤维体积分数为30%的2. 5维针刺碳毡为预制体,通过等温化学气相渗透法(Isothermal Chemical Vapor Infiltration,ICVI),制备4种C/C-SiC复合材料,基体中SiC含量由56%降至15%,其密度相近(1. 87~ 1. 91 g/cm~3)。利用扫描电子显微镜和X射线衍射仪对上述材料的显微结构和物相组成进行观察和分析,并在 MM-1000型摩擦磨损试验机上研究复合材料的摩擦磨损性能。结果表明:随着基体SiC含量的降低,C/C-SiC复合材料的平均宏观硬度由98. 2HRA降至65. 1HRA,硬度分布的均匀性也明显下降;制动过程的平均摩擦系数和质量磨损率均显著增加;通过对摩擦表面形貌和磨屑微观形貌的分析,表明制动过程中的磨损机制受材料表面宏观硬度的影响显著;随着复合材料表面硬度的降低,磨损机制由磨粒磨损为主向磨粒磨损和黏结磨损联合转变,从而使摩擦系数和磨损量显著提高。 |
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其他语种文摘
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Four kinds of C/C-SiC composites were fabricated by isothermal chemical vapor infiltration (ICVI),and the 2. 5D needlepunching carbon felt was taken as the preform. The volume fraction of carbon fiber in felt is 30%. The density of C/C-SiC composites is similar (1. 87-1. 91 g /cm~3),while the weight ratio of SiC is decreased from 56% to 15%. The microstructure and phase composition of C/C-SiC composites were observed by SEM and XRD respectively. Friction and wear behavior of the C/C-SiC composites were investigated with the MM-1000 friction machine. The results show that the average macro hardness of matrix is decreased from 98. 2HRA to 65. 1HRA with the decrease of SiC content from 56% to 15%,and uniformity of hardness distribution is significantly decreased. Finally,by the analysis of microtopography of friction surface and wear debris,it is found that the superficial hardness has an obvious influence on mechanism of wear during braking process. The wear mechanism of the C/C-SiC composites transforms from grain wear to the combination of grain wear and adherent wear with the decrease of surface hardness. At the same time,the average friction coefficient and mass wear rate is increased obviously during breaking process. |
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来源
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航空材料学报
,2017,37(4):52-60 【核心库】
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DOI
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10.11868/j.issn.1005-5053.2016.000199
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关键词
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等温化学气相渗透法
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C/C-SiC复合材料
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摩擦磨损性能
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地址
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湖南科技大学, 高温耐磨材料及制备技术湖南省国防科技重点实验室;;难加工材料高效精密加工技术湖南省重点实验室, 湖南, 湘潭, 411201
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长沙矿冶研究院资源所, 长沙, 410012
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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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1005-5053 |
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学科
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一般工业技术 |
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基金
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湖南省自然科学省市（湘潭）联合基金
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湖南省军民融合产业发展专项资金资助项目
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材料成形与模具技术国家重点实验室(华中科技大学)开放基金
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国家金属材料近净成形工程技术研究中心(华南理工大学)开放基金
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广东省金属强韧化技术与应用重点实验室(广东省材料与加工研究所)开放基金
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文献收藏号
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CSCD:6124930
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