氟云母加入量对可加工氟闪石玻璃陶瓷反应析晶的影响  

EFFECT OF FLUORMICA ADDITION ON REACTIVE CRYSTALLIZATION IN MACHINABLE FLUORAMPHIBOLE GLASS-CERAMICS

作　　者：章为夷[1] 高宏[1] 

机构地区：[1]大连交通大学材料科学与工程学院,辽宁大连116028

出　　处：《硅酸盐学报》2007年第10期1396-1400,共5页Journal of The Chinese Ceramic Society

摘　　要：用X射线衍射、扫描电镜研究了不同加入量氟云母晶体的钠钙玻璃粉末在烧结过程中的反应析晶。结果表明:氟云母加入量小于20%(质量分数,下同)时,反应析晶形成透辉石;加入40%时形成氟闪石;加入60%时氟闪石和氟云母共存;加入80%时大部分氟云母未反应,只有少量氟闪石形成。提出氟云母向透辉石和氟闪石转变的晶体学模型来解释上述结果。烧结过程中,玻璃中的Na2O和CaO通过扩散进入氟云母晶体,导致硅氧四面体平面网断裂,转变成链状结构。反应析晶的最终产物与进入氟云母晶体中的氧含量有关,决定于最终晶体中O和Si的摩尔比。The reactive crystallizing behaviors in soda-lime glass powder with different additions of fluormica crystals were studied using X-ray diffraction and scanning electron microscopy during the sintering process. The results show that when the addition of fluormica was less than 20% （in mass fraction, the same below）, diopside was formed via reactive crystallization; when 40% fluor- mica was added, fluoramphibole was formed. Fluormica and fluoramphibole coexisted in compact with 60% fluormica addition; a large amount of fluormica remained unchangeable and only a small amount of fluoramphibole was formed when 80% fluormica was added. A crystallography model explaining the transformation from fluormica into diopside and fluoramphibole was proposed. During the sintering process, the diffusion of Na2O and CaO from glass into fluormica resulted in the breakage of the [SiO4] tetrahedron sheet structure; this caused the sheet structure to change into a chain structure. The final reactive crystallizing phases depend on the oxygen content migrating from the glass into the fluormica crystal, and they are controlled by the mole ratio of O to Si in crystals.

关 键 词：氟云母 氟闪石 透辉石 反应析晶 钠钙玻璃 

分 类 号：TQ174.75[化学工程—陶瓷工业]