U.S.-Egypt Cooperative Research : Synthesis and Sintering of TiC Based Ceramic Matrix Composites for Structural Applications

描述：该项目支持华盛顿州西雅图华盛顿大学材料科学与工程系的Rajendra Bordia博士和埃及Helwan的中央冶金研究与开发研究所(CMRDI)的Zaki I.Mohamed博士的合作研究。他们计划研究用于结构应用的TiC基陶瓷基复合材料的合成和烧结。为了满足更高的切割速度、更高的公差和更长的刀具寿命的挑战，需要生产具有更高硬度、耐磨性和断裂韧性的量身定制的显微组织。这就需要进一步发展加工技术，包括非常规加工方法，需要对合成和烧结过程进行精确的了解和控制，以避免由于烧结率差异、性能变化和温度不均匀而导致的样品变形、开裂和高应力水平。智能优点：含和不含韧性粘结剂的陶瓷基复合材料(CMC)具有特别的工业价值。这类材料的性能取决于其性能，而这些性能又取决于其组成和微观结构。PIS将研究在有或没有韧性粘结剂(Fe，Ni，Co，)的情况下，合成高密度TiC及其与其他材料(Al_2O_3，ZrO_2)的复合材料的可能性，以努力改善其力学性能。自蔓延高温合成(SHS)与外加负载相结合将被用于制备这些材料。使用该技术的优点是能够同时进行合成和烧结，且一步完成。将研究控制最终对象的物理和机械性能的不同工艺参数。这两个小组拥有互补的专门知识和资源，这将使解决这一问题成为可能。埃及团队将专注于合成含和不含韧性粘结剂的TiC基CMCS材料。研究了控制合成过程的不同参数对合成过程的影响。美国团队将专注于埃及开发的材料的微观结构和机械特性。系统地研究了成分和显微组织对相关力学性能的影响。更广泛的影响：该项目可以改进TiC复合材料的切割和钻削工具，这些工具需要更有效、更高的切割速度、更高的公差和更长的刀具寿命。该项目将启动一项新的国际合作，并将为初级和高级研究人员提供在独特的国际合作环境中工作的机会。该项目得到了美国-埃及联合基金计划的支持，该计划为两国的科学家和工程师提供资助，以开展这些合作活动。

0612063BordiaDescription: This project supports collaborative research by Dr. Rajendra Bordia, Department of Materials Science and Engineering, University of Washington, Seattle, Washington and Dr. Zaki I. Mohamed, Central Metallurgical Research and Development Institute (CMRDI), Helwan, Egypt. They plan to study the synthesis and sintering of TiC-based ceramic matrix composites for structural applications. Meeting the challenges of higher cutting speeds, higher tolerances and longer tool life requires the production of tailored microstructure with improved hardness, wear resistance and fracture toughness. This requires further developments in the processing techniques including unconventional processing methods requires a precise knowledge and control of the synthesis and sintering processes to avoid specimen distortion, cracking and high stress level due to sintering rates difference, properties variations and temperature non- uniformity.Intellectual Merit: Ceramic matrix composites (CMC) with and without ductile binder are of special interest to industry. The performance of such materials depends on their properties, which in turn depends on the composition and microstructure. The PIs will study the possibility of synthesis of highly dense TiC and its composites with other materials (Al2O3, ZrO2) with and without ductile binder (Fe, Ni, Co,) in an effort to improve their mechanical properties. Self-propagating high temperature synthesis (SHS) combined with application of external load will be used in the fabrication of these materials. The advantage of using this technique is the ability of performing synthesis and sintering at the same time and in one step. The different processing parameters controlling the physical and mechanical properties of the final object will be investigated. The two teams have complementary expertise and resources that will make it possible to address this problem. The Egyptian team will focus on the synthesis of the TiC-based CMCs materials with and without ductile binder. The effect of different parameters controlling the synthesis process will be studied. The US team will focus on the microstructural and mechanical characterization of the materials developed in Egypt. A systematic investigation of the effect of the composition and microstructure on relevant mechanical properties will be conducted. Broader Impact: The project can lead to improvements in cutting and drilling tools from TiC composites which are needed to be more effective, allow higher cutting speeds, higher tolerances and longer tool life. This project will initiate a new international collaboration and will provide both junior and senior researchers an opportunity to work in a unique international collaborative environment. This project is being supported under the US-Egypt Joint Fund Program, which provides grants to scientists and engineers in both countries to carry out these cooperative activities.