Cu-Ti合金中Ti含量对C/C复合材料润湿性能的影响  

Effect of the Ti content of Cu-Ti alloy on the wettability of C/C composites

作　　者：于奇[1] 张福勤[1] 张小英[1] 夏莉红[1] 周显光[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2013年第2期224-229,共6页Materials Science and Engineering of Powder Metallurgy

基　　金：国家重点基础研究发展规划项目(2011CB605803);国家高技术研究发展计划资助项目(2012AA03A207);粉末冶金国家重点实验室自主课题

摘　　要：利用超高温接触角测量仪、光学显微镜、扫描电镜、X射线衍射仪研究Tj含量对Cu-Ti合金与C／C复合材料润湿性的影响。结果表明，随下i含量增加，Cu—Ti合金对C／C的接触角逐渐降低。当Ti的质量分数为4．8％时，接触角降低到90°以下，Cu-Ti合金与C／C复合材料部分润湿；当Ti的质量分数为8％时接触角降为0°，Cu—Ti合金与C／C复合材料完全润湿。润湿界面形貌与Ti含量相关，当Ti含量为8％时，界面出现宽大的层状剪切裂纹；当Ti含量为12％时，界面致密无裂纹，Cu—Ti合金能较好地渗入C／C复合材料中的孔隙；当Ti含量为16％时，界面出现数量较多的细小裂纹，Cu—Ti合金熔体中的钛元素向界面扩散形成富钛层，并与C／C复合材料中的碳元素反应生成厚度为3～5gm的连续TiC层，该TiC层可改善合金对C／C复合材料的润湿性能。The effect of the Ti content of Cu-Ti alloy on the wettability between the Cu-Ti alloy and carbon/carbon composites was investigated by the ultrahigh temperature contact angle measuring instrument, optical microscope, scanning electron microscope and X-ray diffraction. The results show that the contact angle between Cu-Ti and C/C gradually decreases with increasing Ti content. When the mass fraction of Ti reaches to 4.8%, the contact angle decreases to below 90°, which illustrates that the alloy can wet C/C composites partially; and when the contact angle turns to zero at 8% Ti content, the Cu-Ti alloy can totally wet the C/C composites. Moreover, it shows that the interface morphology is related to the Ti content of the Cu-Ti alloy, the stratiform shearing cracks are found near interface at 8% Ti, whereas no crack occurs at 12% Ti, which is benefit to the Cu-Ti alloy infiltrating into the C/C composite. When the Ti content of alloy increases to 16%, many microcracks can be found on the interface. The Ti in the alloy to diffuse into the interface to form the Ti-rich layer easily and then reacts with the C element of the C/C composites and form a 3-5 μm thick continuous TiC layer, which can improve the wettability of alloy on C/C composites.

关 键 词：C C复合材料 铜基合金 润湿性能 界面反应 

分 类 号：TG425[金属学及工艺—焊接]