两步烧结对牙科氧化锆陶瓷微观组织的影响.pdf

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1、华西口腔医学杂志第31卷第5期2013年1O月·496~WestChinaJournalofStomatologyVol-31No．5Oct．2013http：llwww．hxkqyxzz．net【文章编号l1000—1182(2013)05-0496—04两步烧结对牙科氧化锆陶瓷微观组织的影响蹇超李宁吴之凯腾劲颜家振四川大学制造科学与工程学院功能材料实验室，成都610065【摘要l目的研究两步烧结工艺对牙科氧化锆陶瓷微观组织的影响。方法纳米氧化锆经过干压、冷等静压成型后预烧，切削加工成试样，采用传统烧结、单步烧结和两步烧结工艺，通过对试样密度和晶粒大小的测定，得出了两步烧结

2、中较高温度T1与较低温度T2的大致范围，对比了两步烧结与传统烧结的微观组织，研究两步烧结中T1、T2对微观组织的影响。结果两步烧结中T1、T2的大致范围分别为1450—1550cC和1250—1350cc；两步烧结相对于传统烧结，密度更高，晶粒更细，组织更均匀；T1主要影响晶粒尺寸，对致密度影响不大；T2主要影响致密度，而对晶粒大小影响不明显。结论两步烧结能够在高致密化情况下细化晶粒，有利于优化牙科氧化锆陶瓷材料的微观组织。I关键词l氧化锆；两步烧结；晶粒；微观组织I中图分类号JR783．2I文献标志码lAIdoil10．7518／hxkq．2013．05．013Influe

3、nceonmicrostructureofdentalzirconiaceramicspreparedbytwo-stepsinteringJianChao，LiMg，WuZhikai，，YanJiazhen．(FunctionalMaterialsLaboratory，SchoolofManufacturingScienceandEngineering，SichuanUniversity，Chengdu610065，China)【Abstract1ObjectiveToinvestigatethemicrostructureofdentalzirconiaceramicsp

4、reparedbytwo-stepsintering．MethodsNanostructuredzirconiapowderwasdrycompacted，coldisostaticpressed，andpre—sintered．Thepre—sintereddiscswerecutprocessedintosamples．Conventionalsintering，single—stepsintering，andtwo—stepsinteringwerecarriedout，anddensityandgrainsizeofthesamplesweremeasured．Aft

5、erward，T1and／orT2oftwo—stepsinteringrangesweremeasured．Effectsonmicrostructureofdifferentroutes，whichconsistedoftwo-stepsinteringandconventionalsinteringwerediscussed．TheinfluenceofT1and／orT2ondensityandgrainsizewereanalyzedaswel1．ResultsTherangeofT1wasbetween1450℃and1550℃．andtherangeofT2wa

6、sbetween1250℃and1350℃．Comparedwithconventionalsintering，finermicrostructureofhigherdensityandsmallergraincouldbeobtainedbytwO—stepsintering．GraingrowthwasdependentonT1，whereasdensitywasnotmuchrelatedwithT1．However，densitywasdependentonT2，andgrainsizewasminimallyinfluenced．ConclusionTwo—step

7、sinteringcouldensureasinteringbodywithhighdensityandsmallgrain，whichisgoodforoptimizingthemicrostructureofdentalzirconiaceramics．【Keywords1zirconia；two-stepsintering；grain；microstructure3mo1％氧化钇稳定的四方多晶氧化锆(3moi％结才能得到具有高密度和强度的修复体。yttria—stabilizedtetragona