原位热压反应制备Ti3AlC2／TiB2复合材料

Ti3AlC2综合了陶瓷和金属的诸多优点，有着潜在的广泛应用前景。然而，单相Ti3AlC2的硬度和强度偏低，限制了它的广泛应用。引入第二相形成复合材料是解决上述问题的一个有效方法。以Ti粉、Al粉、石墨和B4C粉为原料采用原位热压方法成功地合成了Ti3AlC2/TiB2复合材料。利用DSC和XRD对其反应路径作了详细研究，并利用SEM和TEM对复合材料的微观结构进行了表征，最后测试了复合材料的硬度和强度。结果表明用B4C-Ti-Al-C体系，可以在较低温度下合成致密的无杂质Ti3AlC2／TiB2复合材料；引入的TiB2明显提高了Ti3AlC2的硬度和强度。

The Preparation of Ti3AlC2/TiB2 Composites by In Situ Hot-Press Synthesis Process

Ti3AlC2 combines the merits of metals and ceramics, and has great potential for industrial applications. However, lower strength and poorer hardness restrict its extensive applications. Incorporation of second phase into matrix to get composite is an effective way to solve the above mentioned problems. Using Ti powder, Al powder, graphite and B4C powder as starting materials, Ti3AlCE/TiB2 composites were prepared by in situ reaction synthesis. The reaction route for B4C-Ti-Al-C system was investigated by DSC and XRD, and the microstructure of the composite was characterized by SEM and TEM. The strength was tested by SEM and TEM. The results show that dense and impurity-free Ti3AlC2/TiB2 composites can be produced at a relative low temperature in B4C-Ti-Al-C system. The hardness and strength of Ti3AlC2 are improved significantly by the incorporation of TiB2.