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1、摘要高温合金本身具备耐高温、耐腐蚀等优良性能,但是由于其使用环境复杂、严苛,在使用过程中也会发生疲劳、高温蠕变、变形等,为了进一步提升高温合金表面硬度及耐蚀性等要求,尝试使用化学复合镀的手段强化合金表面。在高温合金表面制备了一种Ni-P-Al2O3复合镀层。使用单因素手段研究了纳米Al2O3颗粒的分散方式、添加量、搅拌速率以及时间对镀层显微硬度的影响。结果表明:使用酒精分散可以使颗粒在镀层中呈现弥散分布;当颗粒浓度在0.5g/L~9g/L范围内逐渐增加时,镀层硬度先增加后减小,在1g/L时达到最大值;当搅拌速率逐渐增大时,镀层硬度逐渐降低
2、,100r/min的硬度最大;镀层硬度随时间增大先升高后减小,当时间为1h时,得到的镀层硬度值最大。当颗粒添加量为1g/L,搅拌速率为100r/min,复合镀时间为1h时制备的镀层硬度最大,达到609.18Hv。研究了镀层的热性能,镀层在400℃热处理1h后呈现出最好的性能,硬度达930.92Hv。关键词:高温合金;化学复合镀;硬度;工艺;热处理AbstractSuperalloyhashightemperatureresistance,corrosionresistance,excellentperformance,butbecause
3、ofitsapplicationofenvironmentiscomplex,demanding,itwilloccur,hightemperaturecreepdeformation,etc.,inordertofurtherimprovethehigh-temperaturealloysurfacehardnessandcorrosionresistanceetc,whenused.wetryusingcompositeplatingmeansofstrengtheningthealloysurface.Inthehigh-tempe
4、raturealloyplatedaNi-P-Al2O3compositecoating.Theeffectoftheconcentrationsofnano-Al2O3,dispersionmethods,stirringspeedandcompositeplatingtimeonthemicrohardnessofelectrolesscompositecoatingswasinvestigatedbysinglefactorexperiment.Theresultsindicatethatparticlesdispersedinth
5、ecoatingpresented,whenusingalcoholdispersion,Coatinghardnessdecreasesafterthefirstincreaseandreachingamaximumat1g/L,Whentheparticleconcentrationisgraduallyincreasedduring0.5g/L-9g/L;coatinghardnessdecreased,thehardnessmaximumis100r/min,whenthestirringspeedisgraduallyincre
6、ased;thecoatinghardnessdecreaseswithtimeafterthefirstrise,whenthetimeis1h,coatinghardnessismaximum.Thecompositeplatinghasgoodproperties,compositeplatingmicrohardnessis609.18HVwhenthenano-Al2O3particlesisalcoholicwetting,theconcentrationofAl2O3is1g/L,thestirringspeedis100r
7、/min,thetimeofcompositeplatingis1h.Thethermalpropertiesofthecoatingin400℃×1hheattreatment,theelectrolesscompositeplatingmicrohardnessisupto930.92Hv.Keyword:superalloy;chemicalplating;chemicalcompositeplating;microhardness;corrosionresistance目录摘要IAbstractII第一章绪论31.1高温合金31.
8、1.1高温合金简介31.1.2高温合金按照基体元素分类31.1.3高温合金的应用31.2化学镀发展及研究现状31.2.1化学镀的概述31.2.2Ni-P化学镀的工艺条件31.2.3化学镀Ni-