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1、中文摘要本實(shí)驗(yàn)利用溶膠．凝膠法制備了陶瓷剛玉磨料前驅(qū)體，并采用無(wú)壓燒結(jié)技術(shù)最終制備出了新型陶瓷剛玉磨料。利用掃描電鏡、金剛石單顆粒抗壓強(qiáng)度測(cè)定儀和顯微硬度測(cè)試儀等測(cè)試設(shè)備，系統(tǒng)的研究了不同種類(lèi)添加劑、添加劑配比及加入量、造粒方式、燒結(jié)工藝對(duì)磨料的顯微結(jié)構(gòu)、單顆粒抗壓強(qiáng)度和顯微硬度的影響。實(shí)驗(yàn)結(jié)果表明，不同添加劑種類(lèi)、添加劑配比及加入量、造粒方式、升溫速率、燒結(jié)溫度、保溫時(shí)間對(duì)磨料的性能均有很大的影響。選取合適的添加劑成分能有效地控制晶粒的大小和晶型；適當(dāng)?shù)奶砑觿┡浔炔坏梢杂行У卮龠M(jìn)氧化鋁燒結(jié)，抑止晶粒的長(zhǎng)大，同時(shí)可以提高磨料的單顆?？箟簭?qiáng)度；加入適量的添
2、加劑能夠細(xì)化晶粒，提高磨料的強(qiáng)度及顯微硬度；使用干凝膠直接造粒的方法得到的坯體密度較高，能顯著地提高燒結(jié)體的致密度及抗壓強(qiáng)度；燒結(jié)過(guò)程中低溫階段較高的升溫速率會(huì)導(dǎo)致磨料顆粒出現(xiàn)宏觀裂紋，高溫階段升溫過(guò)慢會(huì)促進(jìn)晶粒生長(zhǎng)，使磨料性能惡化；燒結(jié)溫度對(duì)磨料的性能影響較為明顯，燒結(jié)溫度過(guò)高會(huì)直接導(dǎo)致晶粒的長(zhǎng)大及強(qiáng)度的降低；在所研究的保溫時(shí)間范圍內(nèi)保溫時(shí)間對(duì)磨料的顯微結(jié)構(gòu)影響不明顯，但適當(dāng)?shù)谋貢r(shí)間卻有利于提高磨料的單顆?？箟簭?qiáng)度。關(guān)鍵詞：陶瓷剛玉，磨料，制備，性能ABSTRACTNewceramiccorundumabrasiveswerepreparedthrou
3、ghpressurelesssintermgoftheprecursormadebysol—gelmethod．Theeffectsofdifferentadditives，additivesconlbinationandamounts，granulationmethodsandsinteringprocessonthemicrostructure，singleparticlecompressivestrengthandmicrohardnessoftheabrasiveswereanalyzedsystematicallybyusingSEM，diamo
4、ndsingleparticlecompressivestrengthtesterandmicrohardnesstester．Theresultsshowedthatthepropertiesoftheabrasiveswereinfluencedintenselybyadditivescombinationandamounts，granulationmethods，heatingrates，sinteringtemperature，holdingtimeinthesinteringtemperature．Thegrainsizeandshapecoul
5、dbewellcontrolledbychoosingsuitableadditives．Properadditivescombinationwouldpromotesinteringofalumina，restrainthegrowthofgrains，improvethesingleparticlecompressivestrength．Withappropriateadditivesamounts，thegrainsizewasreduced．thestrengthandmicrohardnessoftheabrasiveswereimproved．
6、DirectgranulationmethodfromdrygelWasgoodtoincreasethedensityofgreenbodiesandthestrengthofsinteredbodies．Higherheatingrateinlowtemperatureperiodwouldleadtomacrocracks。whilemuchlowerheatingrateinhightemperatureperiodwouldresultintheovergrowthofabrasivegrains，whichwoulddeterioratethe
7、propertiesofabrasives．SinteringtemperaturehadobviouseffectOilthepropertiesoftheabrasive，highersinteringtemperaturewouldinducethegrowthofthegrainanddecreasethesIrengthofabrasives．HoldingtimeintheresearchedrangehadlittleinfluenceontheInicrostructureofabrasives，butproperholdingtimewo
8、uldimprovethesingleparticlestreng
