TC4表面真空钎焊c-BN耐磨层的研究.pdfVIP

《热加S-工艺》2016年10月第45卷第19期

TC4表面真空钎焊c—BN耐磨层的研究

高凯，巨建辉，马光，操齐高2，李进

(1．西安建筑科技大学冶金工程学院，陕西西安710055；2．西北有色金属研究院，陕西西安710016)

摘要：采用AgCuniTi钎料在TC4表面真空钎焊c．BN耐磨层。研究了c．BN与AgCulnTi不同体积比的混合料

与TC4钎焊后耐磨层的耐磨性，并对AgCulnTi钎料与c-BN的焊接性及界面微观结构进行了分析。结果表明：c-BN体

积分数在50％左右时，钎焊工艺性较好，耐磨强度较高。AgCuniTi钎料对c-BN有较好的润湿性，两者界面结合紧密，并

在界面处形成反应层。AgCulnTi钎料中的Ti元素向c．BN颗粒表面富集并与c-BN颗粒表面B和N元素发生反应，形

成TiB2和TiN，实现了AgCuInTi钎料与c．BN颗粒的化学冶金结合。

关键词：AgCulnTi；c-BN；TC4；真空钎焊；耐磨层

DOI：10．14158／i．cnki．1001-3814．2016．19．008

中图分类号：TG454文献标识码：A文章编号：1001．3814(2016)19．0031．03

Researchofc-BNWear-resistantLayeronTC4SurfacebyVacuumBrazing

GAOKai，JUJianhui，MAGuang2，CAOQigao，LIJin2

(1．SchoolofMetallurgicalEngineering，Xi、allUniversityofArchitectureandTechnology，Xi、all710055，China；2．Northwest

InstituteForNon-ferrousMetalResearch，Xi、all710016，China)

Abstract：AgCulnTifillerwasutilizedtobrazec-BNwear—resistantlayeronTC4surfacebyvacuumbrazing．Thewear

resistanceofthelayerswithdifferentpercentagesofc-BNandAgCuniTiwasstudied．Theweldabilitynadmicrostructureof

AgCuInTiactivefillertobrazec-BNwereanalyzed．Theexperimentalresultsindicatethathtebrazabilityandtheabrasion

resistancearebetterwhenthepercentageofthec-BNis50％．AgCulnTiactivefillerexhibitsagoodwettabilitytobrazing

c-BN，thejointbetweenfillerandc-BNiscompact，nadareactionlayerisformedbewteenhtem．Duringbrazing，Tielement

inAgCulnTialloytransferstothesurfaceofhtec-BN，andbondingbehavioronc—BNsurfacebyAgCulnTialloyfilleris

realizedthroughTiNnadTiB2whichareproducedbyinteractionbewteenTielementofAgCulnTialloyandNorBelements

ofc-BNsurface．Thus．htechemicalmetallurgicbondnighasbeenformedintheinterfacebewteenAgCuniTialloynadc—BN．

Keywords：AgCulnTi；c-BN；TC4；vacumubrazing；weal-resistancelayer

TC4合金具有比强度高、耐腐蚀性好等突出优