简介:ZrO2-SnO2compositenanoparticleswerepreparedbyheatingthehydrateprecursorssynthesizedbythechemicalco-precipitationreactionofZrOCl2andSnCl4.Theprecursorswereexaminedbydifferentialthermalanalysis(DTA)andthermogravimetricanalysis(TGA).ThecompositepowderwascharacterizedusingX-raydiffraction(XRD),transmissionelectronmicroscopy(TEM)anddesorptionisotherm(Barrett-Joyner-Halendamethod).Theaveragecrystalsizeofthenanoparticlerangesfrom15to30nmforthesamplecontaining5%-25%ZrO2(massfraction).MostoftheporesintheZrO2-SnO2nanoparficlesareabout10-20nmindiameter.Thecompositepowderispromisingforchemicalsensors.
简介:HINAPLAS2014国际橡塑展(第二十八届中国国际塑料橡胶工业展览会)已于4月26日在上海落下帷幕,本届展会无论从入场人数还是规模上,都刷新了多项纪录。
简介:Vibrationfatigueisthemainfailuremodeofcompressorblade.Evaluatingthevibrationstressofbladethatleadstocrackingisveryusefulforanalysisofvibrationfatigue.Inthispaper,fatiguestressestimationmethodsbyquantitativefractographywerestudiedthroughexperimentalbladeandin-servicefirst-stagecompressorbladeinordertoevaluatetheinitiationvibrationstressofin-serviceblade.Theanalysisprocessofinitiationvibrationstresswasestablished.Theevaluatingresultofvibrationstressofin-servicebladesubjectedtocentrifugalforceandbendingvibrationstressagreeswithaeroenginetestresult.Itisshownthattheevaluationmethodcannotonlyevaluatetheequivalentfatiguestressesofdifferentcrackdepthsbutalsoyieldtheinitiationequivalentfatiguestress.