重力分离SHS陶瓷内衬复合管界面现象

利用自蔓延高温合成-重力分离法制备了陶瓷内衬20碳钢、Cr25Ni20耐热钢和1Cr18Ni9Ti不锈钢高炉煤粉喷吹复合管。对其界面现象的研究表明,金属/陶瓷间的结合主要表现为机械结合。其中,在不锈钢复合管中除有更强的机械锚固效应外,还兼以由Ti元素扩散而形成的溶解和浸润结合迹象。各复合管经使用后,碳钢、耐热钢复合管界面仍表现为机械结合,而在不锈钢复合管中,钢基中Ti元素和煤粉中C元素在界面区富集,陶瓷/金属间过渡区加宽,且陶瓷一侧组织中出现TiC新相,使其结合方式逐渐向扩散结合过渡,并呈现部分反应结合迹象。 

INTERFACE PHENOMENON IN CERAMIC-LINED COMPOSITE PIPE PRODUCED BY G-T SHS TECHNIQUE

Based on gravitational separation thermit(G T) self propagating high temperature synthesis(SHS) technique, ceramic lined composite gun pipes respectively with the base of 20 carbon steel, Cr25Ni20 heat resisting steel and 1Cr18Ni9Ti stainless steel were produced. It was obtained that interface bonding between metal and ceramics in composite gun pipes was mainly achieved with mechanical combination. In 1Cr18Ni9Ti composite pipes, except for stronger interlocking, solution and infiltration bond type was formed to some extent due to accumulation at the interface and spreading to the ceramic layer of Ti element. After use in industry, the bonding mechanism in 1Cr18Ni9Ti composite pipe had been gradually transferred to diffusion bonding, and tendency of partial interface reaction bonding was presented as results of Ti and C element accumulating at the interface area, intermediate areas between ceramics and metal being widened and TiC new phase in ceramics appearing. While it remained mechanical combination at interface of 20 carbon steel and Cr25Ni20 steel composite pipes.