Processing of Ternary High Temperature Ceramic Composites With Enhanced Properties

性能增强的三元高温陶瓷复合材料的加工

• 批准号: 0758584
• 负责人: Lia Stanciu
• 金额: $ 15.2万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-08-15 至 2012-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0758584&HistoricalAwards=false
• 关键词: Processing; Ternary; Temperature; Ceramic; Composites

The research objective of this award is to gain fundamental understanding of processing-microstructure-property correlations in the fabrication of high-temperature ternary composite ceramics, processed by Spark Plasma Sintering (SPS). The specific aims of the project are to: 1) sinter by SPS zirconium diboride (ZrB2) and hafnium diboride (HfB2) model samples and evaluate their material properties; 2) synthesize zirconium(hafnium)diboride-silicon carbide-zirconium carbide (Zr(Hf)B2-SiC-ZrC) ultra-high temperature ceramics by SPS; 3) examine the effects of heating rate and the application of an electrical field on the sample density and microstructure; and 4) achieve compositional control of these material systems. The resulting composites are expected to display excellent high-temperature structural properties, good electrical and thermal conductivity, chemical inertness against molten metals, and very good thermal shock resistance. If successful, the results of this research will lead to the development of the processing science necessary to manufacture bulk ultra-high temperature ceramics (UHTC) with fine microstructure, improved mechanical properties, high density and higher heat and oxidation resistance than materials presently available. Other important expected advances include understanding the interplay of pulse current, temperature and pressure effects on UHTC sintering and coarsening at different length scales; development of a consistent process design/characterization methodology that is applicable to UHTCs for large and net shape parts; and systematic defect characterization for quality control in the fabrication of ultra-high temperature ceramics. It is also anticipated that the results of this investigation will improve overall confidence in using SPS as an advanced processing technique for manufacturing ultra-high temperature ceramics as thermal protection materials for various applications.

该奖项的研究目标是获得对火花等离子烧结（SPS）高温三元复合陶瓷制造过程中加工-微观结构-性能相关性的基本理解。该项目的具体目的是：1)用SPS烧结二硼化锆（ZrB2）和二硼化铪（HfB2）模型样品，并评估其材料性能；2) SPS合成二硼化锆（铪）-碳化硅-碳化锆（Zr(Hf)B2-SiC-ZrC）超高温陶瓷；3)研究加热速率和电场施加对样品密度和微观结构的影响；4)实现对这些材料体系的成分控制。所得到的复合材料有望表现出优异的高温结构性能，良好的导电性和导热性，对熔融金属的化学惰性，以及非常好的抗热震性。如果成功，这项研究的结果将导致加工科学的发展，以制造具有精细微观结构，改进机械性能，高密度和比现有材料更高的耐热性和抗氧化性的大块超高温陶瓷（UHTC）。其他重要的预期进展包括了解脉冲电流、温度和压力对不同长度尺度下UHTC烧结和粗化的相互作用；开发一致的工艺设计/表征方法，适用于大型和净形零件的UHTCs；并对超高温陶瓷制造过程中的缺陷进行了系统的表征和质量控制。预计本研究的结果将提高人们对SPS作为一种先进的加工技术来制造超高温陶瓷作为各种应用的热防护材料的信心。