简介:AComputationalStudyofGasPhaseChemistryinCarbonNanotubeSynthessbyPECVD;AfieldpointbasedapproachforsensorconditioninginMO-CVDreactors;AMethodforReal-TimeControlofThinFilmCompositionUsingOESandXPS;Amechanism-basedmodelofchemicalvapordepositionofepitaxialSi{sub}(1-x)Ge{sub}xflirts
简介:[篇名]1.55-umsilicon-basedreflection-typewaveguide-integratedthermo-opticswitch,[篇名]120×90ElementThermoelectricInfraredFocalPlaneArraywithPreciselyPatternedAu-blackAbsorber,[篇名]4H-SiCEpitaxialGrowthfcrHigh-PowerDevices,[篇名]A90nmgenerationcopperdualdamascenetechnologywithALDTaNbarrier,[篇名]Acomparativemicrotribologicalinvestigationofdiamond-likecarbonfilmsforapplicationsinmicrosystems,[篇名]Acomparisonofmicrocrystailinesiliconpreparedbyplasma-enhancedchemicalvapordepositionandhot-wirechemicalvapordeposition:electronicanddeviceproperties.
简介:复合环形气瓶爆破压力58MPa,未满足60MPa设计指标。气瓶水压爆破试验前依次经强度试验、气密性检查和疲劳试验。气瓶外层缠绕芳纶纤维,内衬为TC4钛合金超塑成形后激光焊接。运用多种分析手段开展内衬裂纹及断口的宏微观形貌分析、特征微区化学成分测定、焊缝金相组织检查。结果发现:在内衬内焊缝收弧焊趾部位存在裂纹源,裂纹源由数个微氧化脆性准解理小平面组成,源区与瞬断过渡区有疲劳条带特征。分析表明,裂纹源形成于焊接过程,在疲劳试验中发生疲劳扩展,而后爆破试验因裂纹前端应力强度因子达到临界值而发生失稳爆裂,裂纹性质为氢脆裂纹,属焊接气体保护不充分引起的环境吸氢。