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首页> 外文期刊>European Journal of Glass Science and Technology, PartB. Physics and Chemistry of Glasses >Effect of crystallisation of a glass tested in vitro for its bioactivity
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Effect of crystallisation of a glass tested in vitro for its bioactivity

机译：体外测试玻璃的结晶活性的影响

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摘要

The in vitro bioactivity was studied of glassy and crystallised RKKP of molar composition: SiO_2=46.091; CaO=35.967; MgO=4.372; CaF_2=3.997; Na_2O=4.637; K_2O=0.127; P_2O_5=4.570; La_2O_3=0.097; Ta_2O_5=0.142. Crystallisation was performed with two different temperature schedules leading to very different microstructures: (i) non-isothermal (10 deg C/min to 1050 deg C) heat treatment (sample RKKP-NIT) leading to glass-in-glass phase separation and very fine microstructure consisting of fluoroapatite, wollastonite and a residual glassy phase; and (ii) isothermal crystallisation in the temperature range between the solidus and liquidus temperatures, 2 h at T=1250 deg C, (sample RKKP-IT) leading to a rough microstructure consisting of fluoroapatite crystals embedded in a non-demixed glassy phase. Bioactivity was studied in vitro by monitoring the surface structural and compositional changes after soaking in simulated body fluid (SBF). The formation of a phosphate layer crystallised to hydroxyapatite was observed in the case of glassy RKKP and RKKP-IT, with faster kinetics in this last one. In the case of RKKP-NIT, development of a rough surface was observed due to slow dissolution of the separated silicate glassy phase. The different behaviour was linked to compositional changes of the phases formed during the crystallisation process.
机译：研究了摩尔组成为：SiO_2 = 46.091;玻璃态和结晶态的RKKP的体外生物活性。 CaO = 35.967; MgO = 4.372; CaF_2 = 3.997; Na_2O = 4.637; K_2O = 0.127; P_2O_5 = 4.570; La_2O_3 = 0.097; Ta_2O_5 = 0.142。结晶采用两种不同的温度程序进行，从而导致非常不同的微观结构：（i）非等温（10℃/ min至1050℃）热处理（样品RKKP-NIT）导致玻璃内玻璃相分离，并且由氟磷灰石，硅灰石和残余玻璃相组成的精细微观结构; （ii）在固相线温度和液相线温度之间的温度范围内（在T = 1250摄氏度下2 h）进行等温结晶（样品RKKP-IT），从而导致粗糙的微观结构，该微观结构由嵌入非脱溶玻璃态的氟磷灰石晶体组成。通过监测浸泡在模拟体液（SBF）中的表面结构和组成变化，在体外研究了生物活性。在玻璃状RKKP和RKKP-IT的情况下，观察到形成结晶为羟基磷灰石的磷酸盐层的形成，在最后一个过程中动力学更快。在RKKP-NIT的情况下，由于分离出的硅酸盐玻璃相缓慢溶解，观察到了粗糙的表面。不同的行为与结晶过程中形成的相的组成变化有关。

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