低压辅助熔渗3D-C/Cu复合材料的组织和界面特性

Microstructure and Interfacial Characteristics of 3D-C/Cu Composites Prepared by Molten Infiltration at Low Pressure

以碳纤维细编穿刺织物为预制体,Cu-6Ti为基体合金,采用低压辅助熔渗工艺成功制备了3D-C/Cu复合材料,并利用XRD、OM、SEM和EDS对复合材料的微观组织和界面特性进行了研究。结果表明,添加适量的Ti能明显改善碳纤维与铜基体的润湿性,有利于熔渗的进行。熔渗过程中,合金熔体在压差作用下渗入碳纤维织物中,微观组织分析表明熔渗效果良好;复合材料的界面通过Ti与C的反应扩散形成,扩散使反应层厚度不断增加,经过54min后反应扩散完毕。

3D-C/Cu composites were synthesized successfully by molten infiltration of Cu-6Ti alloy into fine weave pierced fabrics of carbon fiber,and microstructure and interfacial characteristics of the composites were analyzed by X-ray diffraction (XRD),optical microscope(OM),scanning electron microscope (SEM) and energy dispersive spectrometry (EDS). The results indicate that the wettability of copper matrix with carbon fiber can be obviously improved with proper Ti addition,which is beneficial for the molten infiltration effects.Molten alloy is infiltrated into carbon fiber fabric due to pressure difference during molten infiltration. Desirable infiltration effects can be observed by microstructural analysis. The interface of composites is formed by diffraction reaction of Ti with C,and its thickness is increased with advancing in diffraction. Finally,fifty-four minutes later,the reactive diffusion is completed.