School of Mechanical and Materials Engineering, University College Dublin, Belfield, Dublin 4, Ireland.
J Mater Sci Mater Med. 2011 Sep;22(9):2035-44. doi: 10.1007/s10856-011-4392-6. Epub 2011 Jul 20.
Apatite-mullite glass-ceramics (AMGCs) are under investigation as a potential alternative to hydroxyapatite (HA) as a coating for cementless fixation of orthopaedic implants. These materials have tailorable mechanical and chemical properties that make them attractive for use as bioactive coatings. Here, AMGC coatings on Ti(6)Al(4)V were investigated to determine an improved heat treatment regime using a systematic examination of the different inputs: composition of glass, nucleation hold and crystallisation hold. An upper limit to the heat treatment temperature was determined by the α + β --> β of Ti(6)Al(4)V at 970°C. The glass composition was modified to produce different crystallisation temperatures and sintering characteristics. A glass was found that is fully crystalline below 970°C and has good sinterability. The effects of different heat treatment time and temperature combinations on the coating and substrate morphologies were examined and the most suitable combination determined. This sample was further investigated and was found to have qualitatively good adhesion and evidence of an interfacial reaction region between the coating and substrate indicating that a chemical reaction had occurred. Oxygen infiltration into the substrate was quantified and the new route was shown to result in a 63% reduction in penetration depth.
磷灰石-莫来石玻璃陶瓷（AMGCs）作为羟磷灰石（HA）的替代品，正被研究用于非骨水泥固定骨科植入物。这些材料具有可调节的机械和化学性能，使其成为生物活性涂层的理想选择。本文研究了 Ti(6)Al(4)V 上的 AMGC 涂层，以确定一种改进的热处理方案，方法是系统地检查不同的输入因素：玻璃的组成、成核保持和结晶保持。热处理温度的上限由 Ti(6)Al(4)V 的 α + β --> β 决定，温度为 970°C。玻璃成分经过修改，以产生不同的结晶温度和烧结特性。发现了一种在 970°C 以下完全结晶且具有良好烧结性的玻璃。研究了不同的热处理时间和温度组合对涂层和基体形貌的影响，并确定了最合适的组合。对该样品进行了进一步研究，发现其具有定性良好的附着力和涂层与基体之间界面反应区的证据，表明发生了化学反应。对氧向基体的渗透进行了定量分析，结果表明新方法可使渗透深度减少 63%。
