Design of Ceramic-Metal Composites with Novel Architectures

新型结构陶瓷金属复合材料的设计

• 批准号: RGPIN-2017-05183
• 负责人: Plucknett, Kevin
• 金额: $ 2.4万
• 依托单位: Dalhousie University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=684629
• 关键词: Design; Ceramic; Metal; Composites; Novel

Ceramic-metal composites, or cermets, combine a high hardness ceramic phase with a ductile metallic binder', and are widely used in severe wear and corrosion environments. The proposed research programme involves continued development of TiC and Ti(C,N) based cermets, using high ductility Ni3Al-based binder alloys. Two novel cermet architectures' are proposed in this work: (i) hierarchically structured materials, with constituent phases on nano- to macro-length scales, for high performance wear/corrosion applications, and (ii) lightweight, controlled pore morphology materials, for high energy impact absorption.******The hierarchical cermets will significantly extend our prior studies, through incorporation of industrial diamond particles (0 to 30 vol.% in total) into the cermet microstructure, in combination with graphene additions within the metallic binder (0 to 3 vol.% of the binder volume). Diamond incorporation is expected to increase the cermet hardness and, consequently, the wear resistance, while graphene additions will likely raise the binder yield stress and lower the frictional sliding coefficient. These modified characteristics will significantly improve the wear resistance.******The lightweight, porous cermets will be prepared with both spherical and elongated pores. These materials constitute an entirely new class of engineered' cermet, with controlled architectures'. The primary aim is to fabricate ultra-lightweight, high stiffness cellular materials that can absorb significant energy in compression. To generate a low volume of spherical porosity (0 to 40 vol.%), fugitive starch fillers will be used (following our prior work on porous zirconia ceramics). Higher volume fractions of spherical pores will be generated using a direct foaming technique, which is anticipated to create up to 90 vol.% porosity. Anisotropic pores will be formed through the use of freeze-casting, following our recent collaborative work on alumina ceramics. The porous green bodies will then be densified by reaction sintering or melt-infiltration. Cermet characterisation will include assessment of their microstructures, mechanical and thermal properties, sliding wear behaviour, and aqueous corrosion response.******As an integral component of the research, several HQP (including 3 at PhD level) will receive hands-on training in a wide variety of materials processing and analysis techniques, enhancing their opportunities for subsequent employment in a variety of advanced engineering areas. It is fully expected that this research will result in a significant number of publications, opportunities for knowledge dissemination (e.g. national/international conferences), and the potential to generate valuable intellectual property. Ultimately, successful industrial implementation of these novel materials can be expected to lower maintenance costs in demanding applications.

陶瓷金属复合材料或Cermets将高硬度陶瓷相和延性金属粘合剂结合在一起，并广泛用于严重的磨损和腐蚀环境中。提出的研究计划涉及使用高延展性基于Ni3Al的粘合剂合金的TIC和TI（C，N）Cermets的持续开发。在这项工作中提出了两种新型的Cermet体系结构：（i）在纳米至宏观尺度上具有构成阶段的层次结构化材料，用于高性能磨损/腐蚀应用，以及（ii）轻巧的，受控的孔形形态材料，高能量吸收的高能量吸收。总共卷到Cermet微结构中，结合金属粘合剂内的石墨烯添加（粘合剂体积的0至3卷）。预计钻石掺入将增加CERMET硬度，因此，耐磨损性，而石墨烯添加可能会增加粘合剂的屈服应力并降低摩擦滑动系数。这些改良的特性将显着提高耐磨性。******将用球形和细长的毛孔制备轻质，多孔的Cermets。这些材料构成了一类全新的工程“ Cermet，具有控制架构”。主要目的是制造可在压缩中吸收明显能量的超轻质，高刚度细胞材料。为了产生低体积的球形孔隙率（0到40 vol。％），将使用逃犯的淀粉填充剂（遵循我们先前在多孔氧化锆陶瓷上的工作）。球形孔的较高体积分数将使用直接的泡沫技术产生，预计该技术将产生高达90 vol。孔隙率。在我们最近在氧化铝陶瓷方面的合作工作之后，将通过使用冷冻铸造来形成各向异性毛孔。然后，多孔绿体将通过反应烧结或熔化浸润致密。 CERMET表征将包括评估其微观结构，机械和热能性能，滑动磨损行为以及水性腐蚀响应。******作为研究的组成部分，几个HQP（包括3个在PhD水平上）将接受各种材料处理和分析技术的动手培训，增强了他们的各种材料处理和分析的机会，以增强其在各种高级工程领域中的机会。完全可以预期，这项研究将导致大量出版物，知识传播的机会（例如国家/国际会议）以及产生宝贵的知识产权的潜力。最终，可以预期成功的工业实施这些新型材料将降低苛刻应用中的维护成本。