TiB_(2)陶瓷/Crl5基复合材料界面结合研究

Study on Interfacial Bonding of TiB_(2) Ceramic/Crl5 Matrix Composites

利用前驱体法制备了三维连通TiB_(2)陶瓷预制体,结合铸渗工艺成功制备了三维连通Ti8_(2)陶瓷增强Crl5基复合材料。采用电子探针和热力学计算,结合XRD测试研究了界面反映问题。结果表明,Crl5基体与Ti8_(2)增强相结合良好,无明显的孔洞或缝隙。在过渡区,陶瓷增强体与基体之间发生了Ti、B、Fe、Cr、C等元素的扩散及界面反应。在浇注过程中,在高温和氧的共同作用下,发生了界面反应,在复合材料界面处发生化学反应形成了Ti_(3)B_(4)、Fe_(2)Ti和TiC等过渡层物相,界面表现为冶金结合。

The 3D connected TiB_(2)ceramic preforms were prepared by the precursor method,and the 3D connected TiB2 ceramic reinforced Crl5 matrix composites were successfully prepared by the casting and infiltration process.The interface reaction problem was studied by using electron probe and thermodynamic calculation combined with XRD test.The results show that the Crl5 matrix combines well with TiB_(2) reinforcement,and there are no obvious pores or cracks.In the transition zone,diffusion and interfacial reactions of Ti,B,Fe,Cr,C and other elements occur between the ceramic reinforcement and the matrix.In the process of casting,under the action of high temperature and oxygen,the interface reaction takes place,and the chemical reaction takes place at the interface of the composite material to form the transition layer phase such as Ti_(3)B_(4),Fe_(2)Ti and TiC,and the interface shows metallurgical bonding.