Suspension plasma spraying for coatings and powders nanoarchitecture. - La projection par plasma de suspensions pour la nanoarchitecture des revêtements et des poudres.

用于涂料和粉末纳米结构的悬浮等离子喷涂。

• 批准号: RGPIN-2017-06098
• 负责人: Gitzhofer, François
• 金额: $ 1.75万
• 依托单位: Université de Sherbrooke
• 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=680005
• 关键词: Suspension; plasma; spraying; coatings; powders

Thermal spraying is a multi billion dollars activity in North-America. Most of the issues with thermal spraying are to provide to existing materials a localized benefit in terms of higher hardness, superior heat, corrosion resistance, wear or sliding performance.*******All the coatings have to be engineered to survive to a very hostile or demanding environment and need always to be improved to save weight, costs and to decrease the maintenance costs. As the substrate materials quality are progressing with the research invested by the aerospace and automotive industry, so must also the coatings being further developed. Nanostructured coatings brought a whole new application potential in those fields and are showing promising results in the field of energy and sensors.****The principal investigator has developed the suspension plasma technology 20 years ago and this technology is finding its way in the industry. The benefits of this technology are numerous: it allows the safe handling and injection of nanomaterials in a DC or a RF Plasma, it allows a unique flexibility in composition which is recognised by its wide use among the scientific community in governmental research laboratories or universities around the world. Moreover there are two Canadian companies which are manufacturing and selling the suspension plasma technology applied to DC and Induction plasma. However in the industry there are resistances related to the adoption of this technology. Mostly, the process efficiency in terms of kg of materials / kWh is questioned as for a large scale application, the power consumption becomes one of the biggest cost. The quality and reproductibility of the process is also questioned as the standard probes are subjected to a strong erosion due to the material loaded with hard ceramics which are playing the role of a saw for the probes. As a result, in order to improve the overall process it is proposed to resolve some of those issues and propose interesting innovations for the thermal plasma community. The general objective of the proposed research is to enhance the efficiency of the thermal plasma suspension plasma processing of materials****The specific research objectives are to:****-A- Improve the injection of the suspension****-B- Improve the SPS plasma material energy transfer and available energy density****-C- Improve the residence time of the materials in the plasma****-D- Develop the combinatorial synthesis of nanopowders.*******The proposed methodology will include changes in the geometry, spatial distribution and use of multiple injectors (A), heat and mass transfer concepts in plasma conditions will also be needed for (B) and plasma chemistry will be used for (B) and (C) and plasma engineering will be used for (C) and (D).***

热喷涂在北美是一项价值数十亿美元的活动。热喷涂的大多数问题是为现有材料提供更高的硬度，优越的耐热性，耐腐蚀性，磨损或滑动性能方面的局部优势。*******所有涂层都必须设计成能够在非常恶劣或苛刻的环境中生存，并且需要不断改进以节省重量，成本并降低维护成本。随着航空航天和汽车工业的研究投入，基材质量不断提高，涂层也在进一步发展。纳米结构涂层在这些领域带来了全新的应用潜力，并在能源和传感器领域显示出可喜的成果。****首席研究员在20年前开发了悬浮等离子体技术，这项技术正在行业中寻找出路。这项技术的好处很多：它允许在直流或射频等离子体中安全处理和注射纳米材料，它允许在成分上具有独特的灵活性，这在世界各地的政府研究实验室或大学的科学界中得到广泛使用。此外，还有两家加拿大公司正在生产和销售适用于直流和感应等离子体的悬浮等离子体技术。然而，在行业中存在与采用该技术相关的阻力。大多数情况下，以kg材料/ kWh为单位的工艺效率受到质疑，对于大规模应用，功耗成为最大的成本之一。该工艺的质量和再现性也受到质疑，因为标准探头受到强烈的侵蚀，这是由于装载了硬陶瓷的材料对探头起着锯的作用。因此，为了改进整个过程，建议解决其中的一些问题，并为热等离子体社区提出有趣的创新。提出的研究总体目标是提高热等离子体悬浮液等离子体处理材料的效率****具体研究目标是：****- a -改善悬浮液的注入****- b -改善SPS等离子体材料的能量传递和可用能量密度****- c -改善材料在等离子体中的停留时间****- d -开发纳米粉体的组合合成。*******建议的方法将包括改变几何形状、空间分布和使用多个注射器(A), (B)也需要等离子体条件下的传热和传质概念，(B)和(C)将使用等离子体化学，(C)和(D)将使用等离子体工程。***