Low-Cost Molybdenum Disilicide Matrix Composites

低成本二硅化钼基复合材料

• 批准号: 9261567
• 负责人: Andrew Sherman
• 金额: $ 5万
• 依托单位: ULTRAMET, INC.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-01-01 至 1993-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9261567&HistoricalAwards=false
• 关键词: Low; Cost; Molybdenum; Disilicide; Matrix

Carbon fiber-reinforced in SiC whisker-reinforced molybdenum disilicide (MoSi2) matrix composites have been identified as excellent candidates for high temperature structural applications in oxidizing environments. However, the room temperature fracture toughness and high temperature yield and creep strength of these materials can still be drastically improved, and processing issues must be resolved. In this Phase I proposal, Ultramet proposes to demonstrate the feasibility of several fabrication methods for MoSi2 matrix composites that are capable of eliminating the major sources of processing flaws and of greatly increasing process repeatability and cost-effectiveness, while enhancing mechanical properties. MoSi2-coated whiskers and MoSi2-infiltrated carbon fabric will be fabricated by chemical vapor deposition (CVD) with several alloy microstructures, followed by properties measurements. These results will be compared to available data for SiC/MoSi2, C/C, and C/SiC materials, and an analysis of cost, reliability, fabricability, and performance will be conducted. The most immediate application for MoSi2 composites for engine hot section components, and industrial furnace equipment is another potential market. Also, with upcoming EPA requirements for drastically reduced emissions, new materials such as MoSi2 will be required in much greater quantities to withstand the higher temperatures associated with clean-burning, low-Nox technology.

碳纤维增强SiC晶须增强钼 二硅化物（MoSi 2）基复合材料已经被确定为 高温结构应用的优秀候选者 在氧化环境中。 然而，室温断裂 韧性和高温屈服和蠕变强度 材料仍然可以大幅改善，处理问题 必须解决。 在第一阶段提案中，Ultramet建议 证明了几种制造方法的可行性， MoSi 2基复合材料，能够消除主要的 加工缺陷的来源和大大增加的过程 可重复性和成本效益，同时提高机械性能 特性. MoSi 2包覆晶须和MoSi 2渗透碳 织物将通过化学气相沉积（CVD）制造， 几种合金的显微组织，然后进行性能测量。 这些结果将与SiC/MoSi 2的可用数据进行比较， C/C和C/SiC材料，以及成本、可靠性、 可制造性和性能将进行。 MoSi 2复合材料在发动机热处理中的最直接应用 节组件，工业炉设备是另一种 潜在市场。 此外，随着即将到来的EPA要求， 大幅减少排放，MoSi 2等新材料将成为 需要更大的数量来承受更高的 与清洁燃烧、低氮氧化物技术相关的温度。