Preparation of TiB₂+Ni/Ni₃Al/stainless steel gradient material via FASHS

TiB₂+Ni/Ni₃Al/stainless steel gradient material was prepared by mechanical alloying and field-activated self-propagating high-temperature synthesis(FASHS).At first, in order to stimulate the combustion reaction, Ni powder and Al powder were mechanical alloying, then TiB₂+Ni/Ni₃Al/405 stainless steel gradient material was prepared by the reaction thermal of self-propagating combustion reaction.The interface, the microstructure and the phase composition of the gradient material were observed by scanning electron microscope and X-ray diffraction, and metallurgical bonding layer was formed in the interfaces of cermet, Ni₃Al, 405 stainless steel. The mechanical properties, the hardness and the resistance to wear of gradient material were studied by Rockwell hardometer, microhardness tester and grinding abrasion tester, and the results show that cermet surface Rockwell hardness is 90 HRA, and the chemical constitution and the microhardness of material were gradient and the resistance to wear exceed 20Cr case-hardened stell.