304不锈钢复合滤网快速制备工艺及性能研究

发布时间：2018-03-05 08:01

  本文选题：304不锈钢　切入点：复合滤网　出处：《西安科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：不锈钢复合过滤网是一种由不锈钢冲孔板与网径不同的二维不锈钢丝编织网经热压扩散烧结而成的烧结丝网多孔材料。不锈钢复合过滤网不仅具有良好的导热性、导电性、韧塑性、耐蚀性和易加工性,通过控制孔隙度、孔径与孔径的分布,还具有一系列功能特性,广泛应用于过滤与分离、消声减震、热交换、催化剂载体等领域。工业生产中,制备不锈钢复合滤网通常采用固相烧结技术,该方法需要在高温烧结较长时间,且对基材表面前处理要求严格,存在制备成本高、编织节点结合强度不足及不锈钢板(丝)脆化等问题。瞬间液相扩散焊和钎焊是降低连接温度、缩短连接时间的有效连接技术。本文采用瞬间液相扩散焊(简称TLP)和钎焊技术在低温下快速制备304不锈钢复合滤网,研究了复合滤网的微观结构、力学性能、耐腐蚀性能及失效方式,并与传统固相烧结方法制备的复合滤网进行了对比。研究结果表明,以Cu-P合金粉末为中间层,采用TLP技术在30 min,1 MPa,910~950℃条件下制备的304不锈钢复合滤网,冲孔板与二维编织丝网形成的焊接接头由钎缝区的Cu(Fe,Cr)固溶体和基材界面扩散区的Cr-P、Fe-P金属间化合物组成,随着温度的升高,钎缝区变窄,基材界面扩散区变宽。在30 min,1 MPa,960℃条件下制备的304不锈钢复合滤网,焊接接头组织均匀,但接头钎角区存在少量残留的中间层材料。90°往复弯曲试验结果表明,960℃TLP复合滤网的弯曲强度明显高于固相烧结复合滤网。TLP复合滤网的失效方式主要表现为网丝的断裂,而固相烧结复合滤网表现为网丝与冲孔板之间焊接接头的脱粘。以Cu-P合金粉末为中间层的复合滤网在5%NaCl溶液和15%HCl溶液中的腐蚀失重率均随着时间的增加而增加,960℃的TLP复合滤网的腐蚀失重率最小。90°往复弯曲试验结果表明,960℃的TLP复合滤网腐蚀后的焊点脱粘率最低,910℃的TLP复合滤网次之,固相烧结复合滤网最高。以BNi-2为钎料,采用钎焊技术在1 030℃,10 min,压力分别为0.5 MPa、1.5 MPa、2.0 MPa条件下制备了304不锈钢复合滤网。当连接压力从0.5 MPa升高到1.5 MPa时,钎缝中心的云状硼化镍金属间化合物消失。90°往复弯曲试验结果表明,0.5 MPa的钎焊复合滤网的失效方式表现为脱粘和少量丝网断裂,1.5 MPa和2.0 MPa的钎焊复合滤网主要表现为网丝断裂失效。腐蚀试验结果表明,1.5 MPa的钎焊复合滤网在5%NaCl溶液和15%HCl溶液中的腐蚀失重率最低,且其腐蚀后的焊点脱粘率均低于TLP复合滤网和固相烧结复合滤网。与固相烧结复合滤网相比,1.5 MPa的钎焊复合滤网具有较强的抗晶间腐蚀性,基材晶粒没有发生异常长大现象。
[Abstract]:The stainless steel composite filter is a kind of sintered porous material made of two-dimensional stainless steel wire woven mesh with different diameter of stainless steel punching plate and mesh. The composite stainless steel filter not only has good thermal conductivity, but also has good electrical conductivity. Ductile and plastic, corrosion resistance and processability, by controlling porosity, pore size and pore size distribution, also has a series of functional characteristics, widely used in filtration and separation, noise absorption, heat exchange, catalyst carrier and other fields. The solid phase sintering technology is usually used to prepare stainless steel composite filter, which needs a long time of high temperature sintering, and requires strict pretreatment of the substrate surface, and has high cost of preparation. Problems such as insufficient bonding strength of braided joints and embrittlement of stainless steel plates (wires). In this paper, we use transient liquid phase diffusion welding (TLPfor short) and brazing technology to rapidly fabricate 304 stainless steel composite filter at low temperature. The microstructure and mechanical properties of composite filter are studied. The corrosion resistance and failure mode were compared with the composite filter made by traditional solid sintering method. The results showed that the 304 stainless steel composite filter was prepared at 30 min ~ 1 MPA ~ 910 ~ 950 鈩，

本文编号：1569390