The effect of barium content on the crystallization and microhardness of barium fluormica glass-ceramics
The effect of barium content on the crystallization and microhardness of barium fluormica glass-ceramics
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DOI：
10.1016/j.jeurceramsoc.2019.02.019
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发表时间：
2019-07-01
影响因子：
5.7
通讯作者：
Huil, Robert G.
中科院分区：
文献类型：
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作者：
Rashwan, Maher;Cattell, Michael J.;Huil, Robert G.
云母微晶玻璃因其“纸牌屋”微观结构而易于加工。开发了氟化钡玻璃陶瓷并表现出良好的机械性能。这项工作研究了不同的钡含量对云母微晶玻璃结晶和显微硬度的影响。生产了四种具有不同氧化钡含量的玻璃，然后通过两步热处理转化为云母玻璃陶瓷。使用差示扫描量热法 [DSC]、X 射线衍射 [XRD]、扫描电子显微镜 [SEM] 和维氏显微硬度对它们进行表征。 DSC 显示一些配方表明本体结晶是主要机制。 XRD 显示在所有组合物中氟化钡金云母均结晶，并具有少量次生相。 SEM 显示“纸牌屋”微观结构的形成，并且随着 BaO 含量的增加，在背散射模式下观察到对比度下降。较长的热处理/保温时间可以获得极低的硬度值 (< 2 GPa)，并且与形成的发达的纸牌屋微观结构有关。
Mica glass-ceramics are easily machined due to their "House-of-Cards" microstructure. Barium fluormica glass ceramics were developed and indicated good mechanical properties. This work studies the effect of varying barium content on the crystallization and microhardness of mica glass-ceramics. Four glasses were produced with different baria contents, then converted to mica glass-ceramics using a two-step heat treatment. They were characterized using Differential Scanning Calorimetry [DSC], X-ray Diffraction [XRD], Scanning electron microscopy [SEM] and Vickers microhardness. DSC showed some formulations indicated bulk crystallisation as the dominant mechanism. XRD showed the crystallization of Barium fluorphlogopite in all the compositions with minor secondary phases. SEM showed the formation of "House-of-Cards" microstructures and with an increase in BaO content, a decrease in contrast was observed in back scattered mode. Exceptionally low hardness values (< 2 GPa) were obtained for longer heat treatments/holding times and are related to the well-developed house-of-cards microstructures formed.