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首页> 外文期刊>Journal of the European Ceramic Society >Effects of nitrogen and fluorine on crystallisation of Ca-Si-Al-O-N-F glasses
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Effects of nitrogen and fluorine on crystallisation of Ca-Si-Al-O-N-F glasses

机译：氮和氟对Ca-Si-Al-O-N-F玻璃结晶的影响

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摘要

The effect of nitrogen and fluorine substitution on the crystallisation of a new generation of oxyiluoronitride glasses in the Ca-Si-Al-O-N-F system has been studied. Glasses were nucleated for 5 h at the nucleation temperature of Tg + 50 °C and crystallised for 10 h at the maximum crystallisation temperature (900-1050 °C depending on the glass composition) determined from differential thermal analysis. For the oxide glass, crystallisation results in formation of wollastonite (CaSiO_3), gehlenite (Ca_2Al_2SiO_7) and anorthite (CaAl_2Si_2O_8) along with a small amount of residual glass. For crystallisation of oxyfluoride glasses (0 equiv.% N), when fluorine content increases, cuspidine (Ca_4Si_2O_7F_2) is the major crystalline phase at the expense of gehlenite while in oxyluoronitride glasses containing 20 equiv.% N, gehlenite is always the dominant crystalline phase at different fluorine contents. At constant fluorine content (5 equiv.%), an increase in nitrogen content favours the formation of gehlenite rather than anorthite or wollastonite suggesting that this phase may be able to accommodate N into its crystal structure. While a small amount of nitrogen substitution for oxygen can be assumed in the gehlenite structure, the residual glass in the glass-ceramic is expected to be very N-rich. In terms of properties, hardness is shown to be more sensitive to changes in microstructure, phase morphology and crystal size compared with elastic modulus which is related to the amounts of constituent phases present.
机译：研究了氮和氟取代对Ca-Si-Al-O-N-F体系中新一代氧代氮硼氮化物玻璃结晶的影响。将玻璃在Tg + 50°C的成核温度下成核5小时，并在根据差热分析确定的最大结晶温度（900-1050°C，取决于玻璃组成）下结晶10 h。对于氧化物玻璃，结晶导致形成硅灰石（CaSiO_3），钠钙石（Ca_2Al_2SiO_7）和钙长石（CaAl_2Si_2O_8）以及少量残留玻璃。对于氟氧化物玻璃（N含量为0当量％）的结晶，当氟含量增加时，cuspidine（Ca_4Si_2O_7F_2）是主要的晶相，而损失的是钠铝辉石，而在含有20％的N的氟铝氧化物玻璃中，钠铅矿始终是主要的晶相在不同的氟含量。在恒定的氟含量（5当量％）下，氮含量的增加有利于钠钙石而不是钙长石或硅灰石的形成，表明该相可能能够将N容纳到其晶体结构中。虽然可以在钠钙石结构中假设少量的氮替代氧，但预计玻璃陶瓷中的残留玻璃富含N。就性能而言，与弹性模量相比，硬度对微观结构，相形态和晶体尺寸的变化更敏感，而弹性模量与所存在的组成相的数量有关。

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