以钾长石制备白榴石及对牙科玻璃陶瓷的增强作用  

Preparation of leucite using potash feldspar and enhancement of leucite to dental glass-ceramic

作　　者：张临安[1] 胡志强[1] 聂铭歧 秦艺颖 杨晓冬[1] 

机构地区：[1]大连工业大学纺织与材料工程学院,辽宁大连116034

出　　处：《大连工业大学学报》2015年第6期472-475,共4页Journal of Dalian Polytechnic University

摘　　要：以钾长石为主要原料,采用熔融晶化法制备了白榴石熔块。利用X射线衍射分析、扫描电镜、热膨胀系数、抗折强度对样品进行分析,探讨了不同的温度制度对白榴石析晶、热膨胀系数的影响,以及白榴石掺杂对牙科玻璃陶瓷材料的抗折强度的影响。结果表明,熔融温度为1 500℃、析晶温度为1 200℃、保温时间为4h时,样品的析晶能力最好,热膨胀系数为21.04×10-6/℃（20-500℃）。当白榴石的掺杂量不大于50%时,掺杂白榴石可以有效地提高牙科玻璃陶瓷材料的抗折强度。The leucite frit was fabricated by melting-crystallization method using potash feldspar.The sample was characterized using X ray diffraction,scanning electron microscope,thermal expansion coefficient and flexural strength.The influence of temperature regime on crystallization,thermal expansion coefficient and the enhancement of leucite to dental glass-ceramic materials were investigated.The results showed best crystallizing capability and the thermal expansion coefficient was 21.04×10-6/℃（20-500 ℃） when melting temperature was at 1 500 ℃,crystallization temperature was at 1 200 ℃ and holding time was 4h.Doping leucite could effectively improve the flexural strength of dental glass-ceramics when the amount of leucite was lower than 50%.

关 键 词：白榴石 钾长石 熔融晶化法 热膨胀系数 

分 类 号：TH145.1[一般工业技术—材料科学与工程] R783.1[机械工程—机械制造及自动化]