FASHS技术制备TiB_2+Ni/Ni_3Al/405不锈钢梯度材料  

Preparation of TiB_2+Ni/Ni_3Al/stainless steel gradient material via FASHS

作　　者：申艳丽[1] 孟庆森[1] Munir Z A 辛立军[1] 胡利方[1] 

机构地区：[1]太原理工大学材料科学与工程学院,太原030024 [2]Department of Chemical Engineering and Materials Science,University of California,Davis,USA

出　　处：《焊接学报》2007年第8期25-28,32,共5页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(50375105);(50671070)

摘　　要：采用电场激活自蔓延高温合成(FASHS)技术制备了TiB2+Ni/Ni3Al/405不锈钢梯度材料。试验中首先将镍粉和铝粉球磨处理以促进燃烧反应发生,然后采用FASHS技术利用自蔓延燃烧反应热连接制备了TiB2+Ni/Ni3Al/405不锈钢梯度材料。用SEM和XRD分析了梯度材料各层的界面微观组织及相组成,用洛氏硬度计、显微硬度计及磨料磨损试验机分析了材料的力学性能、硬度及表面抗磨性。结果表明,金属陶瓷复合层、Ni3Al层和405不锈钢金属片间形成了可靠的冶金结合,金属陶瓷复合材料表面硬度为90HRA,材料的化学成分和显微硬度呈梯度分布,耐磨性优于20Cr渗碳钢。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.

关 键 词：自蔓延 梯度材料 金属陶瓷 连接 

分 类 号：TQ174[化学工程—陶瓷工业]