钢表面热爆合成耐热金属间化合物基复合材料

Synthesis of Heat Resistant Intermetallic Matrix Composites on Steel Surface Through Thermal Explosion

利用钢熔体点燃Ti-C-3Ni-Al体系热爆反应,在钢件表面合成一层金属间化合物基复合材料,通过对Ti-C-3Ni-Al体系的反应热力学和热爆产物的形貌的分析,研究了金属间化合物基复合材料的物相、组织形态及界面。结果表明:在熔融钢液作用下,Ti-C-3Ni-Al体系反应完全,制备出TiC颗粒增强金属间化合物基表面复合材料。研究发现,TiC的含量对表面复合材料的表面组织和界面结合有明显影响,随着TiC含量的提高,颗粒尺寸略有长大,复合材料更致密,与钢基体界面变为良好的冶金结合。

A layer of intermetallic compound matrix surface composite was fabricated through thermal explosion reaction of Ti-C-3Ni-A1 system initiated by steel melt. The thermal dynamics and morphology of products in thermal explosion of Ti-C-3Ni-A1 were analyzed. The phases, and microstructure of the composite as well as interface bond with steel were studied. The results show that the reaction of Ti-C-3Ni-A1 is completed in liquid steel during poring to form TiC particulate reinforced intermetallic compound matrix surface compos- ite on steel. TiC content is found to influence apparently the microstructure and the interface bond of the composite. With increase of TiC, the composite turns to be compact and have slightly larger TiC particulates. The metallurgical bonding of interface between the composite and steel is established.