简介:DensityofmoltenNiandNi-Walloyswasmeasuredinthetemperaturerangeof1773~1873Kwithasessiledropmethod.ThedensityofmoltenNiandNi-Walloystrendstodecreasewithincreasingtemperature.ThedensityandmolarvolumeofthealloystrendtoincreasewithincreasingWconcentrationinthealloys.ThecalculationresultshowsanidealmixingofNi-Walloys.
简介:W-25Cualloysweremicrowavesinteredina2.45GHzmultimodeapplicator.Thedensification,microstructureandtheirdependenceonsinteringmodeandFeadditionwereinvestigatedindetail.Owingtothevolumetricheatingintrinsicinmicrowaveprocessing,amicrostructurewithlargerWgrainsizeincenterregionswasobservedasagainstlargergrainsizeinedgeregionsforconventionalsintering.Microwavesinteringdemonstratesitsintrinsicadvantagessuchasrapidheatingrate,densificationenhancementandmicrostructuralhomogeneity;butitundesirablypromotesWgraingrowth.Undermicrowavesintering,theroleofFeadditiononcompactconsolidationisnotsosubstantialasunderconventionalsintering.MoreoverFedegradesthemicrostructuralquality,generatingworseuniformityandcoarserWgrains.
简介:Adirectelectrolesscopper(Cu)coatingontungstenpowdersmethodrequiringnosurfacetreatmentorstabilizingagentandusingglyoxylicacid(C2H2O3)asareducingagentwasreported.TheeffectsofcoppersulfateconcentrationandthepHoftheplatingsolutiononthepropertiesofthepreparedW@Cucompositepowderswereassessed.ThecontentofCuinthecompositepowderswascontrolledbyadjustingtheconcentrationofcoppersulfateintheelectrolessplatingsolution.Auniform,dense,andconsistentCucoatingwasobtainedundertheestablishedoptimumconditions(flowrateofC2H2O3=5.01mL/min,solutionpH=12.25andreactiontemperature45.35℃)byusingcentralcompositedesignmethod.Inaddition,thecrystallineCucoatingwasevenlydispersedwithintheW@CucompositepowdersandCuelementinthecoatingexistedasCu0.TheformationmechanismfortheW@Cucompositepowdersbyelectrolessplatingintheabsenceofsurfacetreatmentandstabilizingagentwasalsoproposed.
简介:采用喷雾干燥-氢气还原法制备出W-20wt%Cu超细复合粉末,并对由该复合粉末所制得的压坯进行了高温烧结,利用SEM、XRD等分析手段对复合粉末的特性和烧结体的组织进行了表征和观察。实验结果表明,由该方法制备的W-20wt%Cu超细复合粉末颗粒细小,平均粒径在200nm左右;喷雾干燥后的氧化物复合粉末在还原后产生了新的合金相(Cu0.4W0.6),还原后的复合粉末由Cu0.4W0.6相和Cu相组成,而且两相的晶粒度达到纳米级,其中Cu0.4W0.6相的晶粒约为33nm,Cu相的晶粒约为63nm;复合粉末具有很高的烧结特性,经高温烧结后合金致密度达到98%以上,而且金相组织分布均匀。
简介:有优秀的反的涂层和免职过程穿并且对工业申请合适被开发,并且最佳洗澡作文和进程被在免职率和plating解决方案稳定性上学习洗澡作文,温度和pH价值的影响获得。而且,润滑添加剂和无电的扔的Ni-W-P涂层以及他们的synergistic效果的nano-Cu的tribological性质用测试机器和精力的戒指块磨损被研究散分光计。研究结果证明那Ni-W-P合金涂层和nano-Cu润滑添加剂有优秀synergistic效果,eg,Ni-W-P合金涂层的wear抵抗(与有nano-Cu添加剂的热处理和油)增加了乘的百比是的45钢有基本的油的金属底层,并且零穿被完成,它突破以前的分开的研究的瓶颈上述二个方面。
简介:TheW-Cucompositesarewidelyusedasweld-ingelectrodes,electronicpackagingmaterials,electricdischargematerialsandheatsinksbecauseoftheexcellentproperties.Inthisresearch,theW-40wt.%Cucompositeswerepreparedthroughthevacuumhot-presssinteringmethod,andtheeffectofsinteringtemperatureonthemicrostructureand
简介:以中国专利局、美国专利商标局、欧洲专利局世界专利等数据库中检索到的已公开发布的相关专利为研究样本,对专利的特征进行了统计和分析.结果表明:目前检索到700℃先进超超临界(A-USC)电站锅炉主要候选材料的核心发明专利为13项,主要包括Inconel740/740H、Inconel617/617B、HR6W、Sanacro25、GH2984等牌号合金;其中Inconel617/617B和GH2984的专利已过期,且未检索到最新专利;有关Inconel740/740H、HR6W和Sanncro25等合金的专利分别在近年申请并获得授权,专利的保护范围主要针对合金的成分、组织、用途、制备方法等方面,且这些专利保护的范围很广,有效地保护了合金的知识产权.