钛铜合金无压浸渗石墨基复合材料的制备及其组织与性能  

Preparation of Graphite Composite by Ti-Cu Alloy Pressureless Infiltration Method and Its Microstructure and Properties

作　　者：张雅丁[1] 张涛[1] 

机构地区：[1]北京航空航天大学材料科学与工程学院空天材料与服役教育部重点实验室,北京100191

出　　处：《材料工程》2011年第6期39-42,47,共5页Journal of Materials Engineering

摘　　要：采用无压浸渗方法成功制备了钛铜合金浸渗石墨基金属复合材料。浸渗温度控制在合金成分的熔点附近（1273-1373K）,浸渗时间在5~20s,然后保温10min以充分浸渗。采用X射线衍射、扫描电镜和元素能谱分析等手段对该复合材料进行的研究表明,复合材料中由C,TiC,Cu和TiCu组成,浸渗组织呈均匀网状分布于石墨基体,浸渗相和石墨基体的界面处主要为TiC。对浸渗前后材料的密度、孔隙率和摩擦因数进行的比较研究表明采用该工艺进行的钛铜合金浸渗可填充石墨预制体82%的原有孔隙,浸渗效果良好;复合材料中界面处浸渗相显微硬度达到660（HV）,具有较高硬度,使获得的石墨/合金复合材料摩擦因数降低1/3,改善了材料的耐磨性。A titanium copper alloy infiltrated graphite composite was successfully synthesized by pressureless infiltration of Ti65Cu35 alloy into graphite preform.The infiltration was carried out at 1273-1373K in Ar atmosphere,and the infiltration time is 5-20s,then keep the temperature for 10 minutes to ensure the infiltration be finished completely.The investigation on the infiltrated composite by X-ray diffraction,scanning electron microscope and energy dispersive spectrometer indicates that the composite consists of C,TiC,Cu and TiCu,while TiC is the main product at the interface.Moreover,a reticular uniform distribution of TiC/Cu/TiCu in graphite matrix for the composite is identified.The article studied the density,porosity and friction coefficient of the materials before and after the infiltration.The result shows that the titanium copper alloy graphite has infiltrated 82% of the graphite preform＇s pores and improves its density from 1.602g·cm-3 to 2.653g·cm-3.The titanium carbide generated in the interface region between infiltrated alloy and the graphite matrix has high melting point and high hardness.It can not only improve the wetability of alloy and graphite to increase the bonding strength,but also greatly improve wear resistance of the composite material.

关 键 词：钛铜合金 浸渗 石墨 复合材料 

分 类 号：TB333[一般工业技术—材料科学与工程]