陶瓷刚玉磨料的制备工艺及其性能研究

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1、中文摘要本实验利用扫描电子显微镜、金刚石单颗粒抗压强度测定仪等测试设备，系统地研究了在陶瓷刚玉磨料的制备过程中原料的初始浓度、氨水的加入方式、球磨时间、添加剂的成分、配比和加入量、烧结温度对磨料的显微结构、单颗粒抗压强度的影响。实验结果表明，原料的初始浓度、氨水的加入方式、球磨时间、添加剂的成分、配比、加入量、烧结温度对磨料的性能均有很大的影响。磨料的晶粒尺寸随原料初始浓度的升高而增大，而单颗粒抗压强度则随原料初始浓度的升高而降低；氨水加入速度过快导致磨料的晶粒尺寸变大，致密性变差，单颗粒抗压强度下降；球磨时间并非越长越好，采用合理的球磨时问，既能提

2、高磨料性能，又能提高生产效率；选取合适的添加剂成分能有效地控制晶粒的大小，提高磨料的致密性；适当的添加剂配比不但可以有效地促进氧化铝烧结，抑止晶粒的长大，同时可以提高磨料的单颗粒抗压强度；加入适量的添加剂能够细化晶粒，提高磨料的单颗粒抗压强度；烧结温度对磨料的性能影响较为明显，采用合适的烧结温度才能得到较佳性能的氧化铝磨料。关键词：陶瓷刚玉，磨料，制备工艺，性能ABSTRACTInthepreparationprocessofceramiccorundumabrasives，theeffectsoftheinitialconcentrationofr

3、awmaterials，theaddingmethodsoftheammonia，ballmillingtime，differentadditivesandtheircomposition,additionamountandsinteringtemperatureonthemicrostructure，singleparticlecompressivestrengthoftheabrasivesw．ereresearchedsystematicallyviascanningelectronicmicroscope(SEMlanddiamondsing

4、leparticlecompressivestrengthtester．Theresultsshowedthatthepropertiesoftheabrasiveswereinfluencedremarkablybytheinitialconcentrationofthematerials，theballmillingtime，theaddingmethodsofammonia，additivesandtheircomposition，additionamountandsinteringtemperature．Withtheincreaseofth

5、einitialconcentrationofrawmaterials，thegrainsizeofabrasivesincreased，buttheabrasive’Ssingleparticlecompressivestrengthreduced．Theexcessiveaddingspeedoftheammoniawouldinducetherapidgrowthofabrasivegrains，thepoorcompactnessoftheabrasivesandthedeclineofsingleparticlecompressivestr

6、ength．Longerballmillingtimedidn’tconsequentiallyresultinbeRerpropertiesofabrasives，properballmillingtimewouldnotonlyimprovethepropertiesofabrasives，butincreasetheproductionefficiency．Thegrainsizecouldbecontrolledeffectivelyandthecompactnessoftheabrasiveswouldbeimprovedgreatlyby

7、choosingsuitableadditives．Properadditivescompositionwouldpromotethesinteringofalumina，restrainthegrowthofgrainsandimprovethesingleparticlecompressivestrengthofabrasives．Thegrainscouldbefreedandthesingleparticlecompressivestrengthofabrasivescouldbeincreasedbyaddingappropriateamo

8、untofadditives．Sinteringtemperaturehadobviouseffectont