Development of thermoelectrically active and thermally sprayed ceramics

热电活性和热喷涂陶瓷的开发

• 批准号: 289844451
• 负责人: Dr. Manfred Fries
• 金额: --
• 依托单位: Fraunhofer-Institut für Keramische Technologien und Systeme (IKTS)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/289844451?language=en
• 关键词: Development; thermoelectrically; active; thermally; sprayed

The manufacture of economical thermoelectric generators (TEG) requires effective production technologies. Thermal spraying has the potential to be a cost-effective alternative for the production of TEGs, but major mechanical and technological challenges have to be addressed. TEG's can be realized by thermal spraying as a multi-layer system consisting of the thermoelectrically active p and n semiconductors, as well as electrically insulating and electrically conductive materials. The properties of the sprayed materials depend not only on the spray process but also on the quality of the feedstock material. While electrically insulating or conductive materials are well known in thermal spraying, thermoelectrically active materials have rarely been studied. The development of cost-effective TE materials is an urgent need for the production of TEGs. In particular for the processing by thermal spraying, in addition to the usual requirements concerning electrical and thermal conductivity and the Seebeck coefficient, the thermoelectric material should also be sprayable, have a low toxicity and be available in high amounts. Oxide materials have the highest potential to fulfill there requirements. However significant effort is required in order to understand the specific material behavior of these materials during the spray process and to improve their ZT values. Therefore, the focus of this project lies in the development of environmentally friendly and economically viable thermoelectric materials, which can be processed by thermal spraying. Doped zinc oxide is, due to its sprayability and promising thermoelectric properties, one of the most suitable oxide materials. The main goal of the project is the production of thermoelectrically active coatings which are mechanically stable, ca. 500 µm thick, and present a ZT of at least 0.3 at temperatures above 600 ° C. For this purpose, a tailored spray feedstock, in the form of powders and suspensions, has to be developed and manufactured, and the relationship between the process parameters of the different thermal spray methods and the coatings properties (Thermoelectric, structural, physical) has to be studied.

经济型热电发电机（TEG）的制造需要有效的生产技术。热喷涂有可能成为生产TEG的一种具有成本效益的替代方法，但必须解决主要的机械和技术挑战。TEG可以通过热喷涂实现为由热电活性p和n半导体以及电绝缘和导电材料组成的多层系统。喷涂材料的性能不仅取决于喷涂工艺，还取决于原料的质量。虽然电绝缘或导电材料在热喷涂中是众所周知的，但热电活性材料很少被研究。开发具有成本效益的TE材料是生产TEG的迫切需要。特别是对于通过热喷涂的加工，除了关于导电性和导热性以及塞贝克系数的通常要求之外，热电材料还应当是可喷涂的、具有低毒性并且可以大量获得。氧化物材料具有满足这些要求的最高潜力。然而，为了了解这些材料在喷涂过程中的特定材料行为并提高其ZT值，需要付出大量努力。因此，该项目的重点在于开发环境友好且经济可行的热电材料，这些材料可以通过热喷涂进行加工。掺杂氧化锌由于其可喷涂性和有前途的热电性能，是最合适的氧化物材料之一。该项目的主要目标是生产机械稳定的热电活性涂层，例如。500 µm厚，在600 ° C以上的温度下，ZT至少为0.3。为此，必须开发和制造粉末和悬浮液形式的定制喷涂原料，并且必须研究不同热喷涂方法的工艺参数与涂层性能（热电，结构，物理）之间的关系。