School of Mechanical and Materials Engineering, University College Dublin, Belfield, Dublin 4, Ireland.
J Mater Sci Mater Med. 2011 Jul;22(7):1625-31. doi: 10.1007/s10856-011-4339-y. Epub 2011 May 15.
Bioactive glass-ceramics have been developed as successful bone graft materials. Although conventional sintering in an electrically-heated furnace is most commonly used, an alternative microwave plasma batch processing technique, known as rapid discharge sintering (RDS), is examined to crystallise the metastable base glass to form one or more ceramic phases. Apatite-mullite glass-ceramics (AMGC) were examined to elucidate the effects of RDS on the crystallization of a bioactive glass-ceramic. By increasing the fluorine content of the glass, the fluorapatite (FAp) and mullite crystallization onset temperatures can be reduced. Samples were sintered in a hydrogen and hydrogen/nitrogen discharge at temperatures of ≈800 and 1000 °C respectively with the higher sintering temperature required to form mullite. Results show that the material can be densified and crystallised using RDS in a considerably shorter time than conventional sintering due to heating and cooling rates of ≈400 °C/min.
生物活性玻璃陶瓷已被开发为成功的骨移植材料。虽然传统的电炉加热烧结最为常用，但另一种替代的微波等离子体批量处理技术，称为快速放电烧结（RDS），也被用于使亚稳基体玻璃结晶形成一种或多种陶瓷相。本文研究了磷灰石-莫来石玻璃陶瓷（AMGC），以阐明 RDS 对生物活性玻璃陶瓷结晶的影响。通过增加玻璃中的氟含量，可以降低氟磷灰石（FAp）和莫来石的结晶起始温度。样品分别在氢气和氢/氮放电中于 ≈800 和 1000°C 的温度下烧结，较高的烧结温度需要形成莫来石。结果表明，由于加热和冷却速率约为 400°C/min，该材料可以使用 RDS 在比传统烧结短得多的时间内致密化和结晶。
