GOALI: Shrinkage Porosity and Optimization of Metal-Matrix Composite Processing

GOALI：金属基复合材料加工的收缩孔隙率和优化

• 批准号: 9619198
• 负责人: Olusegun Ilegbusi
• 金额: $ 16.43万
• 依托单位: Northeastern University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-10-01 至 2001-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9619198&HistoricalAwards=false
• 关键词: GOALI; Shrinkage; Porosity; Optimization; Metal

This research project involves experimental, theoretical and process optimization for the metal-matrix composites (MMCS). The experimental program involves solidifying pre-infiltrated samples of the composite and characterizing the product under a range of ambient pressure and cooling rates. This experiment will provide information on the critical pressure required for defect formation as a function of the cooling rate. A parallel theoretical program will be undertaken to numerically predict solidification pattern and porosity distribution under these process conditions. The experimental data will be used to validate the theoretical model. Finally, these findings will be utilized in a computational framework to optimize the casting operation for minimal shrinkage porosity. It is anticipated that this award will provide leveraging to obtain additional funds to study continuous-fiber-reinforced composites, the influence of reinforcement/matrix interfacial characteristics, preform temperature, matrix superheat and hydrogen content on porosity formation, and extension of experimental technique to the fabrication of large castings from pre-infiltrated small components.

该研究项目涉及金属基复合材料（MMCS）的实验、理论和工艺优化。 实验计划包括固化复合材料的预渗透样品，并在一定范围的环境压力和冷却速率下表征产品。该实验将提供有关缺陷形成所需的临界压力与冷却速率的关系的信息。 将采用并行理论程序来数值预测这些工艺条件下的凝固模式和孔隙率分布。 实验数据将用于验证理论模型。 最后，这些发现将用于计算框架中，以优化铸造操作，以实现最小收缩孔隙率。 预计该奖项将提供杠杆作用，以获得额外的资金来研究连续纤维增强复合材料、增强材料/基体界面特性、预成型件温度、基体过热度和氢含量对孔隙形成的影响，以及将实验技术扩展到用预渗透的小部件制造大型铸件。