太阳能热发电输热管道材料的分析

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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