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ID:33013149
大小:3.31 MB
页数:68页
时间:2019-02-19
《太阳能热发电输热管道材料的分析》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、武汉理工大学硕卜学位论文Witha-A1203powder,Suzhoukaolin,talc,quartzasthemainrawmaterials,Mg—A1一SiA1203.basedcompositeceramicsmaterialswerepreparedbyno—pressuresinteringprocess.Theresultsshowed.thatthebestformulaiS0L—A1203powderof80wt%.Suzhoukaolinof6wt%,talcof9%,qu
2、artzof5%.ThesinteringtemperatureofthisformulaWasthelowest,andwiththebestthermalshockresistance.Thesamplesinteredat1480℃for2hhavethewaterabsorptionofO.19%,theporosityofO.57%,thebulkdensityof3.069/cm’,thebendingstrengthof99.59MPa,thesinteringshrinkageof1
3、2.72%andandthepermanentlinearshrinkageof0.23%.After20timesthermalshockresistancetests(quenchingfroml100*Cto25"Cinairmedium),thebendingstrengthis92.72MPa,onlylossrate6.9%.ThestudyofthemechanismofthermalshockshowedthatwhentheamountoftheSuzhoukaolinWasmor
4、ethanlOwt%,themainphasewerecorundum,mulliteandmagnesia-aluminaspinel.Thesecondarymulliteinthesampleledtothevolumeexpansionandahighersinteringtemperature,andabnormalgrowthofsomegrain,impedingtheimprovementofthermalresistanceofthesample.WhentheamountofSu
5、zhoukaolinwasnotmorethan5wt%,themainphrasewerecorundumandasmallamountofmullite,magnesia-aluminaspine.ThesmallamountofsitumulliteandspinelinthesampleCaneffectivelysuppressthegraingrowthandimprovedthethermalshockresistanceofthesamples.Tofurtherreducethes
6、interingtemperatureofthesample,addedcalciteintheMg—A1-Sirecipe.Witha—A1203powder,Suzhoukaolin,calcite,talc,quartzasthemainrawmaterials,Ca-Mg-AI—SiA1203-basedcompositeceramicsmaterialswerepreparedbyno-pressuresinteringprocess.Theorthogonalexperimentalre
7、sultsshowedthattheadditionofcalciteandtalcintheformulaintroducedthesamplewithagoodhigh-temperaturefluxingagentCaOandMgO,whichCanreducesinteringtemperatureeffectively.Takingthesinteringtemperatureasthemainindexandthroughtheorthogonalanalysis,gotthebestf
8、ormula,m(Suzhoukaolin):m(calcinedtalc):m(calcite):m(quartz):m(a—A1203)=8:18:10:5:100.Thesamplesinteredat1340℃for2hhavethewaterabsorptionof0.45%,theporosityof1.87%,thebulkdensityof2.329/cm’,thebendingstrengthof10.28MPa,thesinteringshrink
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