简介：介绍了悬臂舌比大于3.0的H形型材挤压模的特殊设计--采用以上模型芯作为决定型材尺寸的分组合模形式.

简介：17CrNiM06H钢是德国ZF公司开发的Cr-Ni-Mo系齿轮钢，与美国SAE4320H、SAE9310H钢均属于大于1400MPa的高强度、大模数重载齿轮材料。目前，国内大冶钢厂、长城钢厂以及抚顺钢厂陆续完成了17CrNiM06H的国产化，冶金技术已趋成熟，产品性能较稳定，已用于制造重载汽车、装载机、挖掘机驱动桥齿轮。

简介：Anewenvironmentalfriendlycatalyst,H4SiW12O40/PAnwaspreparedandidentifiedbymeansofFT-IR,XRDandTG/DTA.Cyclohexanone1,2-propanediolketalwassynthesizedfromcyclohexanoneand1,2-propanediolinthepresenceofH4SiW12O40/PAn.Thefactorsinfluencingthesynthesiswerediscussedandthebestconditionswerefoundout.Theoptimumconditionsare:molarratioofcyclohexanoneto1,2-propanediolis1:1.4,thequantityofcatalystisequalto1.0%offeedstocks,andthereactiontimeis40min.H4SiW12O40/PAnisanexcellentcatalystforsynthesizingcyclohexanone1,2-propanediolketalanditsyieldcanreachover96.5%.

简介：ThesusceptibilityofweldedjointfortheX65pipelinesteeltoH2Sstresscorrosioncracking(SCC)isinvestigated.SCCtestsonthesteelarecarriedoutintheenvironmentbasedonNACETM-01-77solutionwithsaturatedgaseousH2S.Thethresholdstressintensityfactorandcrackpropagationvelocityarecalculatedaccordingtowedge-openingloading(WOL)specimens.Thethree-dimensionalelastic-plasticfiniteelementanalysisofWOLspecimensisperformedbyusingtheFEMprogrammingpackageANSYS.Stressfieldandconcentrationofhydrogendistributionpropertyaheadofthecracktipareobtained.ThispapersurveyedthemicrostructureofweldedjointandstudiedonthemechanicalpropertiesofX65pipelinesteel.Itprovidesexperimentalbasisforstudyingstresscorrosion.Theresultsofnumericalanalysisareconsistentwithconclusionsofstresscorrosiontest.

简介：1ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｒａｒｅｅａｒｔｈｃｏｂａｌｔａｌｌｏｙｓｈａｖｅｔｈｅｐｏｔｅｎｔｉａｌｆｏｒｍａｋｉｎｇｔｈｅｍａｇｎｅｔｉｃａｎｄｍａｇｎｅｔｏｏｐｔｉｃａｌｍａｔｅｒｉａｌｓ.Ｓｏｆａｒ,ｔｈｅｒａｒｅｅａｒｔｈｃｏｂａｌｔａｌｌｏｙｆｉｌｍｓａｒｅｓｕｂｓｔａｎｔｉａｌｌｙｐｒｏｄｕｃｅｄｂｙｓｐｕｔｔｅｒｉｎｇｏｒｖａｃｕｕｍｐｌａｔｉｎｇ.Ｉｆｓｕｃｈｆｉｌｍｓａｒｅｐｒｅｐａｒｅｄｂｙｅｌｅｃｔｒｏｄｅｐｏｓｉｔｉｏｎｉｎｓｔｅａｄ,ｐｒｏｄｕｃｔｉｏｎｅｆｆｉｃｉｅｎｃｙｗｏｕｌｄｂｅｉｍｐｒｏｖｅｄａｎｄｔｈｅｃｏｍｐｏｓｉｔｉｏｎｏｆｔｈｅａｌｌｏｙｃｏｕｌｄｂｅｃｏｎｔｒｏｌｌｅｄ.Ｂｅｃａｕｓｅｔｈｅｏｘｉｄａｔｉｏｎｒｅｄｕｃｔｉｏｎｐｏｔｅｎｔｉａｌｓｏｆｒａｒｅｅａｒｔｈｅｌｅｍｅｎｔｓａｒｅｖｅｒｙｎｅｇａｔｉｖｅ,ｏｒｇａｎｉｃｓｏｌｖｅｎｔｓｍａｙｂｅｕｓｅｄａｓｅｌｅｃｔｒｏｌｙｔｉｃｍｅｄｉａ.ＥｌｅｃｔｒｏｄｅｐｏｓｉｔｉｏｎｏｆＧｄＣｏａｎｄＳｍＣｏｉｎｏｒｇａｎｉｃｓｏｌｕｔｉｏｎｓｈａｓｂｅｅｎｒｅｐｏｒｔｅ...

简介：TiO2nanoparticleswithdifferentphasesarepreparedbyhydrolysisoftitaniumtetrabutoxideinthepresenceofHCl.ThecompositionandmicrostructureoftheresultingsamplesarestudiedbyXRDandTEM.TheseresultsshowthattherangeofparticlesizeofTiO2isfrom20to30nm.ThemechanismofTiO2photocatalysisreactionhasbeendiscussedextensively.PhotocatalyticactivitiesofnanometerTiO2arealsoevaluatedbydegradationofthecrystalvioletsolution.ExperimentalresultsindicatethatthesynergisticactionofH2O2andultrasonicwavegreatlyenhancesphoto-catalyticreactionofTiO2.

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