预览加载中，请您耐心等待几秒...

Sialon陶瓷组分、微结构及性能调控的中期报告.docx

预览
1/2
2/2

在线预览结束，喜欢就下载吧，查找使用更方便

下载提示 文本预览

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

Sialon陶瓷组分、微结构及性能调控的中期报告 Introduction Sialonceramics,aclassofhigh-performanceengineeringceramics,arewidelyusedinvariousindustrialapplicationsduetotheirexcellentmechanical,thermal,andchemicalproperties.ThesialonceramicsystemhasageneralformulaofSi6-zAlzOzN8-z,wherezcanvaryfrom0to6.Thepropertiesofsialonceramicscanbeadjustedthroughmodificationsintheceramiccomposition,microstructure,andprocessingtechniques.Thismid-termreportdescribestheworkcarriedouttomodifysialonceramicpropertiesbyalteringtheceramiccompositionandmicrostructure. BackgroundandLiteratureReview Sialonceramicsareoftenchosenforhigh-temperatureapplicationsbecauseoftheirstabilityandhigh-temperaturestrength.Theyhavehighhardness,goodwearresistance,andoxidationresistance.Sialonceramicsarealsoexcellentinsulators,andtheyhavelowthermalconductivity,lowthermalexpansioncoefficient,andgoodthermalshockresistance(Zhangetal.,2015).Theexcellentpropertiesofsialonceramicsarisefromtheiruniquemicrostructure,consistingofacombinationofnanosizedgrains,elongatedgrains,andplate-likegrains. Oneofthemostimportantfactorsthataffectsthepropertiesofsialonceramicsisthecomposition.Bychangingthecomposition,onecanmodifythepropertiesofthesialonceramic.Forexample,byvaryingtheamountofaluminumandsilicon,thethermalexpansioncoefficient,mechanicalstrength,andelectricalconductivitycanbeadjusted(Luetal.,2015).Similarly,bymodifyingtheratioofsiliconandnitrogen,themicrostructureofthesialonceramiccanalsobeoptimized,resultinginimprovedmechanicalandthermalproperties(Liuetal.,2020). ExperimentalMethods Toinvestigatetheeffectofcompositionandmicrostructureonthepropertiesofsialonceramics,aseriesofexperimentswerecarriedout.Samplesofsialonceramicswerepreparedusingahot-pressingmethod.Theceramiccompositionwasvariedbyaddingdifferentamountsofsiliconnitride,aluminumnitride,andyttria.Themicrostructureofthesialonceramicwascontrolledbyadjustingtheprocessingparameters,suchastemperatureandpressureduringhotpressing. Themechanicalpropertiesofthesialonceramicswereanalyzedusing