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采用超高重力场燃烧合成技术,通过陶瓷和不锈钢之间的熔化连接与原子互扩散,制备出界面具有化学成分梯度特征的TiB 2基陶瓷/1Cr18Ni9Ti不锈钢复合材料。因超高重力场燃烧合成工艺具有“爆燃”的特性以及超高重力场所形成的高温真空环境,使得不锈钢表面发生部分熔化,进而实现了陶瓷/不锈钢的熔化连接。经XRD、FESEM及EDS分析发现,接头界面连接良好,并因原子的强烈互扩散在界面过渡区形成了三维网络陶瓷/金属梯度复合结构。经测试发现,维氏硬度值与陶瓷基体至不锈钢基底测试距离的关系曲线呈近似抛物特征。同时,复合材料的界面抗剪切强度达到(325±25)MPa,其界面断裂模式是由TiB 2片晶沿晶断裂和Fe-Ni-Cr合金相延性断裂的混合模式组成。
The TiB 2 -based ceramics / 1Cr18Ni9Ti stainless steel composites with chemical composition gradient interface were prepared by melt-bonding and atomic diffusion between ceramic and stainless steel by super high gravity field combustion synthesis technology. Due to the characteristics of “explosion” and the high-temperature vacuum environment formed by ultra-high gravity field, the super-high gravity field combustion synthesis process partially melts the stainless steel surface, thereby realizing the ceramic / stainless steel melt connection. The XRD, FESEM and EDS analysis showed that the interface of the joint was well connected and the three-dimensional network ceramic / metal gradient composite structure was formed in the interface transition region due to the strong interdiffusion of atoms. The test found that Vickers hardness value and the ceramic substrate to the stainless steel substrate test distance curve is a parabolic approximation. At the same time, the interfacial shear strength of the composites reaches (325 ± 25) MPa, and the interfacial fracture mode is composed of a mixed mode of intergranular fracture of TiB 2 platelets and ductile fracture of Fe-Ni-Cr alloy.