The Studies On Reaction-bonded SiC Wear-Resistant

Wear-resistant material usually include polymers wear-resistant materials,steelwear-resistant materials,and diamond wear-resistant materials.However, due to the usingtemperature constraints and high temperature resistant,anti-acid,low price properties for SiCmaterials,it has been widely used in production. As a result of SiC own unique feature,usuallySiC anti-friction material difficulty with agglutination, therefore limits its widespreadapplication.Currently SiC ceramics sintering preparation methods included without pressuresintering,hot pressing sintering,hot isostatic pressing sintering,reactionsintering,etc.Compared with other sintering process,reaction sintering has the advantages ofprocessing to low temperature,firing a short time,the processing methods can be preparedmore complex shape of large size products,etc.From existing data,it found that researcherspay enough attention to the development of reaction-bonded SiC molding processcontrol,sintering mechanism and low attention to the sintering process on the influence ofreaction-bonded SiC.But sintering process of reaction-bonded SiC system has very big effecton the structure and properties of SiC.This paper studies the effect of the type of material melt permeability, curingprocess,carbonization process,weld permeability process,sintering process changes on thestructure and properties of reaction-bonded SiC,and meanwhile uses drainage method,clothlos dimension optical hardness tester,friction and wear test enginery,X-raydiffraction,scanning electron microscope and energy spectrometer to test thedensity,hardness,friction coefficient,Lord crystalling phase, microscopic structure,compositionanalysis and characterization of SiC.Results show that:In40℃for8～12h-50℃for6h-60℃for8～12h-70℃for6h-90℃for6h-110℃for8～12h-130℃for6h-150℃for6h-170℃for8～12h such curingcurve,Heat shrinkable type phenolic resin cured fully,and body shape without distortion.Aftercarbonization at800℃,the body can form unicom pores.Body with high water absorption,isconducive to silicon and silicon alloy infiltration.Silicon in1430℃for3h,can made themost of liquidity for267%,wetting Angle for0°and Silicon alloy in1470℃for3h,canmade the most of liquidity for198%,wetting Angle for6°.But in any temperature pointignition loss rate of silicon-aluminium alloy is more than15%,not appropriate for melting permeability materials.In1430℃melt permeability silicon for3h,again in1550℃for2h,reaction-bonded SiC in certain experimental conditions can gain maximum volume densityfor2.766g/cm3,the highest hardness of2917.67hv wear-resisting performance products;In1470℃melt permeability ferro-silicon alloy for3h,again in1550℃for2h,reaction-bondedSiC in certain experimental conditions can gain maximum volume density for2.94g/cm3,thehighest hardness of3054.33hv wear-resisting performance products.Through analysis of themicroscopic structure of the melt permeability,silicon metal or silicon alloy melt permeabilityto fully the meat slab structure of carbon surface and glass reacts created new silicon carbidephase, new silicon carbide and primary silicon carbide combined with dense SiC sinterformed.This article only discusses the effect of technology system and the type of infiltrationmaterial on the influence of reaction-bonded SiC.If we want to get more density SiC,we alsoneed to optimize the process recipe.