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金属陶瓷将高硬度陶瓷相与延展性金属粘合剂结合在一起，广泛用于严重磨损和腐蚀环境。拟议的研究计划涉及使用高延展性 Ni3Al 基粘结剂合金继续开发 TiC 和 Ti(C,N) 基金属陶瓷。这项工作提出了两种新颖的金属陶瓷结构：（i）分层结构材料，具有纳米到宏观长度尺度的组成相，用于高性能磨损/腐蚀应用；（ii）轻质、受控的孔隙形态材料，用于高能量冲击吸收。******分级金属陶瓷将通过将工业金刚石颗粒（总共 0 至 30 vol.%）纳入金属陶瓷微观结构中，并结合石墨烯添加物，显着扩展我们之前的研究。金属粘合剂（粘合剂体积的 0 至 3 vol.%）。金刚石的掺入预计会提高金属陶瓷的硬度，从而提高耐磨性，而石墨烯的添加可能会提高粘合剂的屈服应力并降低摩擦滑动系数。这些改进的特性将显着提高耐磨性。******将制备出具有球形和细长孔的轻质多孔金属陶瓷。这些材料构成了一种全新的工程“具有受控结构的金属陶瓷”。主要目标是制造超轻、高刚度的多孔材料，可以吸收大量压缩能量。为了产生低体积的球形孔隙率（0 至 40 vol.%），将使用短效淀粉填料（继我们之前对多孔氧化锆陶瓷的研究之后）。使用直接发泡技术将产生更高体积分数的球形孔，预计将产生高达 90 vol.% 的孔隙率。继我们最近在氧化铝陶瓷方面的合作之后，将通过使用冷冻铸造来形成各向异性孔。然后通过反应烧结或熔体渗透使多孔生坯致密化。金属陶瓷表征将包括对其微观结构、机械和热性能、滑动磨损行为和水腐蚀响应的评估。******作为研究的一个组成部分，一些 HQP（包括 3 名博士级别）将接受手工-对各种材料加工和分析技术进行培训，增加他们随后在各种先进工程领域的就业机会。完全预计这项研究将产生大量出版物、知识传播的机会（例如国家/国际会议）以及产生有价值的知识产权的潜力。最终，这些新型材料的成功工业应用有望降低要求苛刻的应用中的维护成本。