首页> 美国卫生研究院文献>Materials >Comparison of Reactive and Non-Reactive Spark Plasma Sintering Routes for the Fabrication of Monolithic and Composite Ultra High Temperature Ceramics (UHTC) Materials
【2h】

Comparison of Reactive and Non-Reactive Spark Plasma Sintering Routes for the Fabrication of Monolithic and Composite Ultra High Temperature Ceramics (UHTC) Materials

机译:整体和复合超高温陶瓷(UHTC)材料的反应性和非反应性放电等离子烧结路线的比较

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

A wider utilization of ultra high temperature ceramics (UHTC) materials strongly depends on the availability of efficient techniques for their fabrication as dense bodies. Based on recent results reported in the literature, it is possible to state that Spark Plasma Sintering (SPS) technology offers a useful contribution in this direction. Along these lines, the use of two different SPS-based processing routes for the preparation of massive UHTCs is examined in this work. One method, the so-called reactive SPS (R-SPS), consists of the synthesis and densification of the material in a single step. Alternatively, the ceramic powders are first synthesized by Self-propagating High-temperature Synthesis (SHS) and then sintered by SPS. The obtained results evidenced that R-SPS method is preferable for the preparation of dense monolithic products, while the sintering of SHS powders requires relatively milder conditions when considering binary composites. The different kinetic mechanisms involved during R-SPS of the monolithic and composite systems, i.e., combustion-like or gradual solid-diffusion, respectively, provides a possible explanation. An important role is also played by the SHS process, particularly for the preparation of composite powders, since stronger interfaces are established between the ceramic constituents formed in situ, thus favoring diffusion processes during the subsequent SPS step.
机译:超高温陶瓷(UHTC)材料的广泛使用在很大程度上取决于是否有将其制成致密体的有效技术。根据文献中报道的最新结果,可以指出,火花等离子体烧结(SPS)技术在此方向上提供了有用的贡献。沿着这些思路,在这项工作中研究了使用两种不同的基于SPS的加工路线来制备大规模UHTC。一种方法,即所谓的反应性SPS(R-SPS),由一步合成材料和致密化组成。或者,首先通过自蔓延高温合成法(SHS)合成陶瓷粉末,然后通过SPS烧结。获得的结果表明,R-SPS方法更适合于制备致密的整体式产品,而在考虑二元复合材料时,SHS粉末的烧结需要相对温和的条件。在整体系统和复合系统的R-SPS过程中涉及的不同动力学机理,即分别像燃烧或逐步固体扩散,提供了可能的解释。 SHS工艺也起着重要作用,特别是对于复合粉末的制备,因为在原位形成的陶瓷成分之间建立了更牢固的界面,因此有利于后续SPS步骤中的扩散过程。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号