本文選題：304不銹鋼　切入點(diǎn)：復(fù)合濾網(wǎng)　出處：《西安科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：不銹鋼復(fù)合過濾網(wǎng)是一種由不銹鋼沖孔板與網(wǎng)徑不同的二維不銹鋼絲編織網(wǎng)經(jīng)熱壓擴(kuò)散燒結(jié)而成的燒結(jié)絲網(wǎng)多孔材料。不銹鋼復(fù)合過濾網(wǎng)不僅具有良好的導(dǎo)熱性、導(dǎo)電性、韌塑性、耐蝕性和易加工性,通過控制孔隙度、孔徑與孔徑的分布,還具有一系列功能特性,廣泛應(yīng)用于過濾與分離、消聲減震、熱交換、催化劑載體等領(lǐng)域。工業(yè)生產(chǎn)中,制備不銹鋼復(fù)合濾網(wǎng)通常采用固相燒結(jié)技術(shù),該方法需要在高溫?zé)Y(jié)較長時(shí)間,且對(duì)基材表面前處理要求嚴(yán)格,存在制備成本高、編織節(jié)點(diǎn)結(jié)合強(qiáng)度不足及不銹鋼板(絲)脆化等問題。瞬間液相擴(kuò)散焊和釬焊是降低連接溫度、縮短連接時(shí)間的有效連接技術(shù)。本文采用瞬間液相擴(kuò)散焊(簡稱TLP)和釬焊技術(shù)在低溫下快速制備304不銹鋼復(fù)合濾網(wǎng),研究了復(fù)合濾網(wǎng)的微觀結(jié)構(gòu)、力學(xué)性能、耐腐蝕性能及失效方式,并與傳統(tǒng)固相燒結(jié)方法制備的復(fù)合濾網(wǎng)進(jìn)行了對(duì)比。研究結(jié)果表明,以Cu-P合金粉末為中間層,采用TLP技術(shù)在30 min,1 MPa,910~950℃條件下制備的304不銹鋼復(fù)合濾網(wǎng),沖孔板與二維編織絲網(wǎng)形成的焊接接頭由釬縫區(qū)的Cu(Fe,Cr)固溶體和基材界面擴(kuò)散區(qū)的Cr-P、Fe-P金屬間化合物組成,隨著溫度的升高,釬縫區(qū)變窄,基材界面擴(kuò)散區(qū)變寬。在30 min,1 MPa,960℃條件下制備的304不銹鋼復(fù)合濾網(wǎng),焊接接頭組織均勻,但接頭釬角區(qū)存在少量殘留的中間層材料。90°往復(fù)彎曲試驗(yàn)結(jié)果表明,960℃TLP復(fù)合濾網(wǎng)的彎曲強(qiáng)度明顯高于固相燒結(jié)復(fù)合濾網(wǎng)。TLP復(fù)合濾網(wǎng)的失效方式主要表現(xiàn)為網(wǎng)絲的斷裂,而固相燒結(jié)復(fù)合濾網(wǎng)表現(xiàn)為網(wǎng)絲與沖孔板之間焊接接頭的脫粘。以Cu-P合金粉末為中間層的復(fù)合濾網(wǎng)在5%NaCl溶液和15%HCl溶液中的腐蝕失重率均隨著時(shí)間的增加而增加,960℃的TLP復(fù)合濾網(wǎng)的腐蝕失重率最小。90°往復(fù)彎曲試驗(yàn)結(jié)果表明,960℃的TLP復(fù)合濾網(wǎng)腐蝕后的焊點(diǎn)脫粘率最低,910℃的TLP復(fù)合濾網(wǎng)次之,固相燒結(jié)復(fù)合濾網(wǎng)最高。以BNi-2為釬料,采用釬焊技術(shù)在1 030℃,10 min,壓力分別為0.5 MPa、1.5 MPa、2.0 MPa條件下制備了304不銹鋼復(fù)合濾網(wǎng)。當(dāng)連接壓力從0.5 MPa升高到1.5 MPa時(shí),釬縫中心的云狀硼化鎳金屬間化合物消失。90°往復(fù)彎曲試驗(yàn)結(jié)果表明,0.5 MPa的釬焊復(fù)合濾網(wǎng)的失效方式表現(xiàn)為脫粘和少量絲網(wǎng)斷裂,1.5 MPa和2.0 MPa的釬焊復(fù)合濾網(wǎng)主要表現(xiàn)為網(wǎng)絲斷裂失效。腐蝕試驗(yàn)結(jié)果表明,1.5 MPa的釬焊復(fù)合濾網(wǎng)在5%NaCl溶液和15%HCl溶液中的腐蝕失重率最低,且其腐蝕后的焊點(diǎn)脫粘率均低于TLP復(fù)合濾網(wǎng)和固相燒結(jié)復(fù)合濾網(wǎng)。與固相燒結(jié)復(fù)合濾網(wǎng)相比,1.5 MPa的釬焊復(fù)合濾網(wǎng)具有較強(qiáng)的抗晶間腐蝕性,基材晶粒沒有發(fā)生異常長大現(xiàn)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，

本文編號(hào)：1569390