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ID:32706304
大小:7.29 MB
页数:65页
时间:2019-02-14
《铸造碳化钨镍基钎料合金复合钎涂材料制备与性能研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要近些年来,抗磨料磨损颗粒强化复合材料的研发是复合材料领域的一个重要方向。随着现代工业不断的进步和发展,人们对抗磨料磨损材料的需求量越来越大,同时对耐磨材料的性能也提出了新的要求。因此,开发新型金属基耐磨材料显得尤为重要。本论文借助于钎涂原理,以铸造碳化钨颗粒为颗粒增强相材料,以镍基钎料Ni82CrSiB合金为基体材料,用真空熔铸法和真空热压法制备新型耐磨钎涂复合材料。试验结果表明:熔铸试样铸造碳化钨颗粒分布均匀、冶金结合良好,致密度高达93%。以不同磨粒的SiC为磨料,在不同载荷条件下利用销一盘磨损试验机测试
2、了铸造碳化钨/Ni82CrSiB复合钎涂材料的二体磨料磨损性能。磨损试验结果表明:铸造碳化钨颗粒增强Ni82CrSiB合金复合材料具有优良的抗磨料磨损能力,耐磨性可达到高铬铸铁的6~10倍。此外,利用XRD、SEM、HRS一150数码洛氏硬度计、71型显微硬度仪等手段系统地研究了铸造碳化钨/Ni82CrSiB复合材料的形貌、组织、硬度等性能。对于热压试样的不致密化现象,给予了分析和解释。为深入研究铸造碳化钨/镍基钎料合金复合材料,打下坚实的理论基础。关键词:钎涂,耐磨复合材料,颗粒强化,铸造碳化钨,致密化Abst
3、ractOneofthemainresearchinganddevelopingaspectsofcompositematerialsinrecentyearsistheusingofcompositematerialsinabrasivewearconditions.Withthedevelopmentofindustry,thedemandofwear-resistingmetalsbecamemuchmorebigger.Atthesametimeitalsosetthenewrequesttothewea
4、r-resistingmetalsperformance.Therefore,itisofgreatimportancetoexploitnewmetalmatrixcompositestofrictionandwear.Inthisdissertation,thecastingtungstencarbidearechosenasthereinforcementphaseofthecompositewhiletheni-basefilleralloyNi82CrSiBasthematrixofthecomposi
5、te.Onthebasisofbrazecoating,wepreparenewcompositestofrictionandwearbycastingpenetrationandhot.presssinteringtechnologyonvacuum.TheresultsshowthatcastingpenetrationtechnologyCanmakeamuchcompact(93%)compositewithawellreinforcementparticledistributionandgoodinte
6、grationbymetallurgy.PinondisktwobodyabrasiontestsisperformedwithdifferentsizeofSiCabrasiveunderdifferentloads.Thetestshowthatthecast.WC/Ni82CrSiBcompositeshavebetterwearresistanceas“10timesasbodymaterialhighchromiumcastiron.Moreover,themorphology,microstructu
7、re,hardnessofcast-WC/Ni82CrSiBcompositesarecompletelyobservedanddeterminedbyusingX—raydiffraction(XRD),scanningelectronicmicroscope(SEM),HRS-150rockwellhardnesstester,opticalmicroscope,and71-microhardnesstester.Atthesametime,weanalysethereasonwhythehot—presss
8、interingcompositeshavemuchgapanddrawback.Thisbuildabettertheoreticalgroundforstudyingthenewcast.WC/Ni-basedfilleralloycompositeforbrazecoating.Keywords:brazecoating,abrasive-wearcomposite
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