Diagnostics of plasma-liquid interactions in suspension and solution precursor plasma spraying

悬浮液和溶液前体等离子体喷涂中等离子体-液体相互作用的诊断

• 批准号: RGPIN-2014-05928
• 负责人: Veilleux, Jocelyn
• 金额: $ 1.68万
• 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=679220
• 关键词: Diagnostics; plasma; liquid; interactions; suspension

This research program focuses on the diagnostics and fundamentals of plasma-liquid interactions in suspension plasma spraying (SPS) and in solution precursor plasma spraying (SPPS). The acquired knowledge will be applied to the synthesis of nanostructured cathodes for lithium-ion batteries and to the deposition of piezoelectric sensors for structural health monitoring.**Nanostructured materials and advanced coatings are key assets for the energy, sensors, aerospace, biomedical and microelectronics industries, all prominently contributing to Canada's economy. These materials and coatings can be obtained from several processing routes, including thermal plasma i) synthesis and ii) deposition, both having proven scalability and industrial processing rates. In these two technologies, feedstock materials are injected into high enthalpy, high temperature plasma jets to be i) melted, vaporized and rapidly quenched to form powders or ii) heated, melted and accelerated towards a substrate to form coatings. To obtain nanostructured powders and coatings, nanoparticle suspensions or solutions of precursors are generally selected as feedstock; the corresponding processes are named SPS and SPPS, respectively. SPS and SPPS processes share a common characteristic: a liquid carries the nanoparticles or the precursors into the plasma jet, as opposed to an inert gas carrying micro-sized particles in conventional plasma spray.**The availability of data acquired in-situ is paramount to the understanding and optimization of SPS and SPPS, just as the introduction of optical sensors helped in understanding and transferring micro-sized particle plasma spray processes to the production floor. Still, commercially available plasma spray sensors are inefficient in diagnosing nano-sized particles and plasma-liquid interactions are far more complex than plasma-gas interactions. As such, further efforts are required to develop sophisticated measurement devices to characterize the plasma-liquid interactions in SPS and SPPS, and to diagnose the velocity, size, heating and composition of nanoparticles in-flight.**This research program will address this need by pursuing five research objectives:*1. To adapt sophisticated data analysis methods and diagnostics tools to characterize SPS and SPPS;*2. To understand how atomized liquid droplets interact with the plasma jet, mapping the dispersion and size distribution of the droplets within the plasma jet;*3. To investigate the plasma-liquid interactions, explaining the influence of the liquid droplets on the plasma properties in controlled-atmospheres;*4. To study the relations between the plasma-liquid interactions and the microstructural properties of the synthesized nanomaterials;*5. To apply the acquired knowledge in SPS and SPPS to the synthesis of nanostructured cathodes for lithium-ion batteries and of piezoelectric sensors for structural health monitoring.**This research will contribute to maintain Canada's leadership in thermal plasma and thermal spray processes. Efficient diagnostics in SPS and SPPS will help transferring such synthesis processes to the worldwide thermal spray industry, which accounts for $10 billion nowadays, the market share of Canada and USA being 37.5%. The training of graduate students in SPS, SPPS and plasma diagnostics is thus a good investment for Canada. Employers will be seeking highly qualified personnel (HQP) with skills that will not only enable them to synthesize nanoparticles and nanostructured coatings, but that will also enable them to engineer and optimize materials for specific applications.

该研究计划的重点是悬浮等离子体喷涂（SP）和溶液前体等离子体喷涂（SPPS）中血浆液相互作用的诊断和基础。获得的知识将应用于用于锂离子电池的纳米结构阴极的合成，以及对结构性健康监测的压电传感器的沉积。这些材料和涂料可以从多个处理途径中获得，包括热等离子体i）合成和II）沉积，既具有可靠的可伸缩性和工业处理速率。在这两种技术中，将原料材料注入高焓，高温等离子体喷气机，以i）融化，蒸发并迅速淬火以形成粉末或II）加热，融化并加速向底物形成涂料。为了获得纳米结构的粉末和涂料，通常选择纳米颗粒悬浮液或前体的溶液作为原料。相应的过程分别命名为SP和SPP。 SPS和SPP的过程具有共同的特征：A液体将纳米颗粒或前体带入血浆喷气机，而与传统等离子体喷雾剂中携带微型颗粒的惰性气体相反。生产地板。尽管如此，市售的等离子体喷雾传感器在诊断纳米大小的颗粒方面效率低下，并且血浆液相互作用比等离子体 - 气体相互作用要复杂得多。因此，需要进一步的努力来开发复杂的测量设备来表征SPS和SPPS中的等离子体 - 液相互作用，并诊断纳米颗粒的速度，大小，加热和组成的速度。适应复杂的数据分析方法和诊断工具来表征SP和SPP；*2。要了解雾化液滴如何与等离子射流相互作用，请绘制等离子射流中液滴的分散和尺寸分布；*3。为了研究血浆液相互作用，解释了液滴对受控大气层中血浆性质的影响；*4。研究血浆液相互作用与合成纳米材料的微结构特性之间的关系；*5。为了将SPS和SPP中的获得的知识应用于锂离子电池的纳米结构阴极以及用于结构健康监测的压电传感器的合成。 SPS和SPPS中有效的诊断将有助于将这种合成过程转移到全球热喷雾业，如今占100亿加元，加拿大和美国的市场份额为37.5％。因此，对SPS，SPPS和等离子体诊断的研究生培训对加拿大来说是一项不错的投资。雇主将寻求具有高素质的人员（HQP），其技能不仅可以使他们合成纳米颗粒和纳米结构涂料，而且还将使他们能够为特定应用程序进行工程和优化材料。