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7417 |
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Friday, May 06, 2022, Hall G2 1:40 PM Characterization & Testing Methods II |
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Powder flow and feeding behavior characterization |
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Rafael Oliveira Da Silva / Treibacher Industrie AG, Austria Ursa Pirnat / Treibacher Industrie AG, Richard Trache/ Treibacher Industrie AG, Christian Hebenstreit*/ Treibacher Industrie AG, Austria |
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The microstructure and thermomechanical properties of thermal spray coatings depend on the spray process parameters and equally importantly on the feedstock powder. The principal characteristics of the feedstock originate from chemical composition, particle morphology and particle size distribution of the powders and are inherited in the manufacturing process. A key mechanical capability of the feedstock is its flow-ability or, more precisely, its capability to create a steady and uninterrupted stream through the powder feeder and the injection system. But how to solve flow-ability problems when the powder clogs the traditional Hall-Flowmeter? How to account for low and high feed rate applications when measuring flow-ability? To address these issues in a quantitative manner, we conducted this study. The aim is, to test the flow properties of thermal spray powders of different morphologies and determine relevant flow characteristics. Correlations between standard analyses, novel dynamic analyses and performances tests on an actual powder feeder will be presented using a variety of ceramic thermal spray powders. Identifying a versatile and reliable method for flow-ability measurements helps to make design and optimization of spray powders more efficient and improves the quality control of the production process. |