简介：

简介：

简介：

简介：反的尖晶石类型金属氧化物，magnesium-manganese-titanium氧化物(Mg2Mn0.5Ti0.5O4)，用coprecipitation/thermal结晶化方法被准备。有这材料的抽取/插入反应被X光检查，交换的浸透能力，pH滴定，和分发系数(Kd)测量调查。Mg2Mn0.5Ti0.5O4的酸处理引起了Mg2+超过81%的抽取，而Mn4+和Ti4+的溶解是不到10%。试验性的结果证明酸处理的样品有交换56mg的一个能力

简介：Inthispaperanewmethodforpreventingweldinghotcracking—theinversestrainmethod(ISM)isdevelopedontheprincipleofweldingmechan-ics.EffectivenessandfeasiblityofmethodinpreventingweldinghotcrackingofhighstrengthaluminumalloyLY12CZbysynchronousrollingduringwelding(SRDW)alongbothsidesoftheweldatasuitabledistancebehindtheweldingarcareexamined.ExperimentalresulteindicatethatweldinghotcrackingofLY12CYcanbeeffectivelypreventedandthemechanicalpropertiesofweldedjointcanalsobeimprovedbythemethod.Itisanimportantnewsolutionforpreventinghotcrackinginweldingofsheetmetal.