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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Bioactive glass engineered coatings for Ti6Al4V alloys: Influence of strontium substitution for calcium on sintering behaviour
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Bioactive glass engineered coatings for Ti6Al4V alloys: Influence of strontium substitution for calcium on sintering behaviour

机译：Ti6Al4V合金的生物活性玻璃工程涂层：锶替代钙对烧结行为的影响

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摘要

Bioactive glass coatings with thermal expansion coefficients matched to Ti6Al4V alloys have been designed, and glasses based on the multi-component system 49.96 SiO_2-7.25 MgO-3.30 Na_2O-3.30 K _2O-3.00 ZnO-1.07 P_2O_5-32.62 CaO (mol%) with 0, 10, 25, 50, 75 and 100% of calcium oxide replaced by strontium oxide have been produced by a melt-quench route. Sintering behaviour has been characterised by differential scanning calorimetry, X-ray diffraction and scanning electron microscopy. Glass transition and crystallisation temperatures and their respective activation energies were determined; extrapolated onset values for these parameters have been determined in order to optimise the sintering temperature for producing amorphous coatings. Amorphous coatings have been produced by enamelling and showed good adhesion to the alloy with the exception of the 100% Sr substituted coating. Substituting strontium for calcium reduced the glass transition temperature and lowered the activation energy for crystallisation whilst increasing the onset temperature of crystallisation. The mixed calcium/strontium glasses exhibit a larger processing window, which favours sintering without crystallisation occurring and obtaining amorphous well sintered coatings. However, complete substitution favours crystallisation and reduces the processing window.
机译：设计了具有与Ti6Al4V合金匹配的热膨胀系数的生物活性玻璃涂层，并基于多组分系统49.96 SiO_2-7.25 MgO-3.30 Na_2O-3.30 K _2O-3.00 ZnO-1.07 P_2O_5-32.62 CaO（mol％）通过熔融-淬火途径已经产生了0、10、25、50、75和100％的被氧化锶代替的氧化钙。通过差示扫描量热法，X射线衍射和扫描电子显微镜表征了烧结行为。测定了玻璃化转变和结晶温度以及它们各自的活化能。已经确定了这些参数的外推起始值，以优化用于生产非晶涂层的烧结温度。非晶涂层通过搪瓷生产，除100％Sr替代涂层外，对合金显示出良好的附着力。用锶代替钙降低了玻璃化转变温度并降低了结晶的活化能，同时增加了结晶的起始温度。钙/锶混合玻璃具有较大的加工窗口，有利于烧结而不会发生结晶并获得非晶态烧结良好的涂层。但是，完全取代有利于结晶并减小了加工窗口。

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