立方氮化硼基陶瓷复合材料的研究

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1、ABSTRACTOwingtohighhardness，highstrengthandtheotheruniqueproperties，CBNmatrixceramiccompositeisbecomingoneofthemostpotentialtoolsinmodemengineeringapplications．Inthisarticle，effectsofadditives，lawmaterialsandpreparationprocessonthepropertiesofvitrifiedbondwerestudied．SurfacetreatmentofCBNabrasiv

2、eandpreparationofmicrocrystailineCBNabrasivewerealsoresearched．TheresultsindicatedthatLi20wasthemostexcellentelementfordecreasingrefractoriness，andthefollowingwereCaF2andZnO．NoobviousdecreasingofrefractorinesswithadditionofMn02，whereastherefractorinesswasincreasedwithimportofFe203．Rawmaterialsha

3、dnotableeffectsontheperformanceofglassbinderforCBNmatrixceramiccomposite．Theresultsshowedthattheelementintheformofcarbonatewasmorebeneficialtothereflactodnessandfluidityofglassbinderthanthatintheformofoxide．Moreover,ifdecompositiontemperatureofcarbonatewaslower,themechanicalpropertyofspecimensha

4、dnoobviousdifferencewithadditionofcarbonateoroxide．However,ifcarbonatewasdecomposednearbythespecimens’raWmaterialsinformofcarbonatedidharmtosinteringtemperature，theimprovethemechanicalpropertyofglassbinder．Comparationbetweenhydrateandcarbonate，ifdecompositiontemperatureofhydratewaslower,rawmater

5、ialsinformofhydratewasmorefavorabletoimprovepropertiesofglassbinderthanthatinformofcarbonate．Preparationprocessinghadobviousinfluenceonthepropertiesofvitrifiedbond．Theresultsindicatedthatpremeltingtreatmentwasnecessaryfortheglassbinderwithadditionofcarbonate．Theporositywasreducedandthestrengthwa

6、sincreasedwithpremeltingprocessing．CBNabrasiveparticlesweretreatedwithacidoralkaliandcoatedwithlOWtemperatureglasscoatings．Theresultswereshownasfollows：Acidtreatmentwasbeneficialtothesingleparticlecompressivestrength，impacttoughnessandheatresistanceofCBNabrasivegrains．Onthecontrary,alkalitreatme

7、ntwasharmfultothepropertiesofCBNabrasivegrains．CBNabrasiveparticlescoatedwithlowtemperatureglasscoatingswerecomparedwithTicoatedCBNparticlesandcorundumcoatedCBNparticles．Theresultsdescribedthatthes01-gelglasscoatingwasexcell