预览加载中，请您耐心等待几秒...

燃烧法合成Al掺杂β-SiC粉体的工艺参数对其介电性能的影响.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

燃烧法合成Al掺杂β-SiC粉体的工艺参数对其介电性能的影响 Introduction: Aluminum-dopedbeta-SiCpowderisanessentialmaterialinelectronicindustriesduetoitsexcellentelectrical,mechanical,andthermalproperties.Inthispaper,wewilldiscusstheimpactoftheprocessparametersonthedielectricpropertiesofAl-dopedbeta-SiCpowdersynthesizedbythecombustionmethod. SynthesisofAl-dopedβ-SiCpowder: CombustionsynthesisisastraightforwardandeconomicalapproachforthesynthesisofAl-dopedbeta-SiCpowder.Theprocessinvolvestherapidcombustionofamixtureoffuelandoxidizertogenerateahightemperature(above2000°C)andhigh-pressure(~100atm)environment,whichfacilitatesthereactionsbetweentheprecursorstoformthedesiredproduct.Thereactionbetweenmagnesium,silicon,andaluminumwasusedtopromotetheformationofAl-dopedbeta-SiCpowder. Effectofprocessparameters: ThefollowingparametershaveanimpactonthedielectricpropertiesoftheAl-dopedβ-SiCpowder: 1.Fuel-to-oxidizerratio:Thefuel-to-oxidizerratiodeterminesthecombustiontemperatureandpressure.Theexcessfuelresultsinalow-temperatureflame,whileexcessoxidizerleadstoahigh-temperatureflame.Ahighercombustiontemperaturecouldleadtohighercrystallinityandpurityofthefinalproduct.However,excessivetemperaturecouldproduceunwantedphasesandcarriersthatmayaffecttheoveralldielectricperformanceofthepowder. 2.Aluminumconcentration:Theconcentrationofaluminumdeterminestheelectricalconductivityofthepowder.Ahigheraluminumconcentrationresultsinlarger-sizedgrainsandhigherelectricalconductivity.Hence,thedielectricconstantandlosstangentofthematerialdecreasewithincreasingaluminumconcentration. 3.Sinteringtemperature:Thesinteringtemperatureisacriticalparameterthatdeterminesthedensityandporosityofthepowder.Highsinteringtemperatureresultsinhigherdensitiesandlowerporosities,whichimprovethemechanicalstrengthandthermalconductivityofthepowder.However,ifthesinteringtemperatureistoohigh,itmaycauseunwantedgraingrowth,whichmayaffectthedielectricproperties. 4.Heatingrate:Theheatingrateaffectstheparticlesizeandmorphologyofthepowder.Ahighheatingratecoul