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1、2009年12月金刚石与磨料磨具工程Dec.2009第6期总第174期Diamond&AbrasivesEngineeringNo.6Seria.l174文章编号:1006-852X(2009)06-0015-04*不同无机铵盐对陶瓷结合剂CBN砂轮造孔的应用研究111211刘一波刘伟杨德涛徐晓伟黄胜林姚炯彬(1.钢铁研究总院,北京100081)(2.北京科技大学,北京100083)摘要分别研究了无机铵盐NH4F、NH4Cl、(NH4)2SO4和NH4HCO3的不同添加量对低温陶瓷结合剂CBN砂轮造孔的影响,采用气孔率、抗折强度以及试样SEM断口形貌对造孔
2、效果进行了评价。结果表明:NH4Cl使砂轮开裂,不能作为低温陶瓷结合剂CBN造孔剂。NH4F造孔效果不明显,不适合造孔。(NH4)2SO4造孔剂的质量分数应控制在5%以内,质量分数达到5%时,砂轮孔隙率为36.14%,抗折强度为29.03MPa,气孔皆为小孔,气孔可调性差。NH4HCO3造孔剂质量分数应控制在15%以内,质量分数为5%时,砂轮孔隙率为34.19%,抗折强度为40.32MPa;质量分数增加到15%时,孔隙率达到42.5%,抗折强度为29.16MPa,且大孔径气孔比例随质量分数的提高而提高,气孔可调性好。关键词无机铵盐造孔剂;气孔率;抗折强度;陶瓷结合剂CBN
3、砂轮中图分类号TG74文献标识码ADOI编码10.3969/.jissn.1006-852X.2009.06.004PoreformingeffectofdifferentinorganicammoniumsaltsappliedonvitrifiedbondCBNwheels111211LiuYiboLiuWeiYangDetaoXuXiaoweiHuangShenglinYaoJiongbin(1.CentralIronandSteelResearchInstitute,Beijing100081,China)(2.BeijingUnivers
4、ityofScienceandTechnology,Beijing100083,China)AbstractFourkindsofinorganicammoniumsaltssuchas:NH4F,NH4C,l(NH4)2SO4andNH4HCO3wereaddedonlowtemperaturesinteringvitrifiedbondCBNwheelsatdifferentmasspercentages.Theirporeformingeffectswereevaluatedbytestingtheirporosity,bendingstrengthandben
5、dingfracturesobservedusingSEM.TheexperimentalresultsshowthatNH4Clisnotanidealporeformingagentforitcausesthewheelcracking;theporeformingeffectofNH4Fisnotobvious,soitisnotasuitablealternative.Themasspercentageof(NH4)2SO4shouldbecontrolledto<5%,whenthemasspercentagereaches5%,theporosityofsa
6、mpleis3614%anditsbendingstrengthis2903MPa;theporesizeissmallandcanbepoorlyadjusted.ThemasspercentageofNH4HCO3shouldbelessthan15%;whenthemasspercentageis5%,itsporosityis3419%andthebendingstrengthis4032MPa;whilethemasspercentagereaches15%,itsporositycanreach42.5%anditsbendingstrengthis29
7、16MPa;andwithinthisamounttheproportionofbigporeincreasesastheadditionamountincreasesandtheporesizesarewelladjusted.Keywordsporeformingagentwithinorganicammoniumsalts;porosity;bendingstrength;vitrifiedbond*基金项目:北京市科委重大科技攻关计划资助(项目编号1101081422801(1-1))16金刚石与磨料
