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《面层制壳工艺研究（study on shell making technology of surface layer）》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、面层制壳工艺研究（Studyonshellmakingtechnologyofsurfacelayer）StudyonshellmakingprocessofinvestmentcastingsurfacelayerJingZongliangCheShunqiang(ZhengzhouDayuchemicalproductsCo.Ltd.)Inrecentyears,theinvestmentcastingprocessofsilicasolpresentsanewimprovedsurfacelayershellmakingprocess
2、,suchasappliedtothesurfaceoffusedsilicapowder,mullitepowder,sandcasting,specialpowder,sand,therefractorysurfacelayerfromasinglevarietyofmoregoods,givefullplaytocomplementarycastingperformancethedifferentmaterial,showtheoptimalcombinationofrefractorymaterialproperties,formi
3、ngasurfacelayerofcrustprocesslevel,thesurfacequalityofthecastingcontinuedtomaintainexcellentdimensionalaccuracy,stability,andthus,shellproductioncostisgreatlyreduced.Inaddition,theintroductionofnewmaterialsintothewaterglassprocesslayerhasbecomeanewbrightpointofwaterglasssh
4、ellmakingprocess.Keywordssurfacecoating;mixedslurry;optimumcombinationofrefractory;Thesurfacelayerofcrustrefractorysilicasolcrustprocesshasbeenusingexpensivezirconpowderandzirconsand,accordingtostatistics,shellmaterialcostsaccountedforabout30%ofthecostofinvestmentcasting,r
5、efractoryceramicshellmaterialaccountedforabout80%ofthecost,andthesurfacelayerofthematerialcostsaccountedfortheentireshellmaterialcosts3/5.So,mustbreakthroughthetraditionalprocessofbeampump,improvetheapplicationofsurfacelayermaterials,surfacecrustinnovationprocess,reducethe
6、productioncostofthesurfacelayerofshellmaking.1kaoliniterefractoryentersthesurfacelayerKaolinitebelongstothealuminumsiliconrefractorymaterial,componentisaluminumsilicatewithaluminaandsilicaasthemaincomponent,arecomposedofglassphase,mullite,quartz,characteristicsofaluminum-s
7、iliconmaterialishighrefractoriness,coefficientoflinearexpansionratioofsilicasand,corundum,hightemperatureandgoodchemicalstability,highthermalstabilityso,backcoatingslurryclayrefractorypowderintheearly70swasappliedtothewaterglass,thecrystallizationofaluminumchloridehardenin
8、g,whichwasso-calledhighstrengthshellmould;thebacklayerandbacklayersandslurryprocessofsili
