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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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低温烧结AlN陶瓷的微结构和热导率
, PP. 23-26
Keywords: 氮化铝,微结构,热导率
Abstract:
采用CaF2,Y2O3和Li2CO3做添加剂,在低温下制备了高热导率的AlN陶瓷,通过SEM,TEM和XRD研究了AlN陶瓷在烧结过程中微结构及晶格常数的变化及其对热导率的影响。研究发现,当使用CaF2和CaF2-Y2O3做添加剂时,液相对晶粒浸润性较差,不利于AlN晶格的纯化。而添加Li2O-CaF2-Y2O3的AlN陶瓷在烧结温度之前已经完成了液相的重新分布,液相与AlN晶粒之间有较好的浸润性,这促进了AlN陶瓷的致密化和AlN晶格的纯化,有利于获得较高的热导率。
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