热电偶保护套管耐铝液腐蚀性分析

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1、太原理T大学硕士研究生学位论文STUDYONALUMINUMLIQUIDCORROSIONRESISTANCEOFTHERMOCOUPLEPROTECTIVETUBEABSTRACTAtpresent，non—ferrousmetalaluminiumprocessingindustriesconsumelamofyLiquidlu"hasthecharacteristicsofstronargeamountotenergLNmdaluminumhascharacteristicsOIstrong钐corrosion，permeabilityandeasyslagging．Thewor

2、kinglifeoftheliquidaluminumtemperaturemeasuringthermocoupleislowandthestainlesssteelthermocoupleprotectivetubecanonlylastforaboutaweek．Therefore，ithassignificancetostudyonthethermocoupleprotectivetubewithlongevity．Intheresearch，thecorrosiveexperimentofcastiron，stainlesssteelsandTi—A1alloyinliqui

3、daluminummacerationunderthetemperatureof750。Cwasconductedfirstly．Thenthetestsampleofcorrosionwasconductedonthemicrostructureobservationandthecorrosionstrength．Thenthemicrostructure，micro—hardnessandthecorrosionstrengthwerestudiedonthesamplesofnitrogentreatment．Theresultshowsthatthemicro—hardness

4、ofthesurfaceisevidentlyimprovedandthecorrosionresistancetoliquidaluminumisnotapparentforthestainlesssteelsamplesafternitrogentreatment．HoweverforthetreatedTi—AIalloysamples，theCorrosionresistanceinliquidAluminumisevidentlyimproved，thentheprocessofcorrosionisanalyzed．Ti．A1203ceramiccoatingswerepr

5、oducedbyusingplasmasprayingandlaserremeltingmethods，andplasmatissueshowstypicallayerstructureafterIlI太原理工大学硕士研究生学位论文spraying．Afterthetreatmentofthelaserremelting，thecoatingstructurebecomesrefined，dense，refinement，dense，well—distributedandthenon—moltenceramicparticledisappearsandtheremeltedlayerh

6、asnoporesappearing．Byusingmicro—hardnessmeasurements，foundthatthedegreeofcoatinghardnessincreasedsignificantlyafterlaserremeltingandthedegreeofhardnessincreasedabout140HV．AfterstudyingonthetransformationoflaserremeltedceramicTi—A1203ceramiclayeEThroughaluminumetchingunderthetemperatureof750。C，th

7、ecorrosionresistanceoftheplasmasprayedcoatinginthealuminumliquidandtheineffectivemechanismshavebeenstudied．TheresultsindicatethatthecorrosionresistanceofTi—A1203coatingishighunderhightemperatureandinthealuminumliquidenvironm