Wrona Adriana, Lis Marcin, Pęcak Krzysztof, Kalemba-Rec Izabela, Dymek Stanisław, Wróbel Mirosław, Bilewska Katarzyna, Kustra Katarzyna, Węglowski Marek Stanisław, Śliwiński Piotr
Łukasiewicz Research Network-Institute of Non-Ferrous Metals, Sowińskiego Str. 5, 44-100 Gliwice, Poland.
Faculty of Metals Engineering and Industrial Computer Science, AGH University of Science and Technology, Czarnowiejska Str. 66, 30-054 Kraków, Poland.
Materials (Basel). 2022 May 27;15(11):3844. doi: 10.3390/ma15113844.
The aim of this work was to develop a new coating material based on Ni20Cr alloy modified with up to 50%wt. rhenium. The modification was carried out by the mechanical mixing of the base powder and ammonium perrhenate with the subsequent thermoreduction in an H atmosphere. The obtained powder consists of a nickel-chromium core surrounded by a rhenium shell. The characterization of the powders-including their microstructure, phase and chemical composition, density, flowability, particle size distribution, and specific surface area-was performed. The influence of plasma current intensity and hydrogen gas flow on in-flight particle temperature and velocity were investigated. The results indicate that there is interdiffusion between the base Ni20Cr and the rhenium shell, resulting in intermediary solid solution(s). The modified powders have a higher specific surface area and a lower flowability, but this does not prevent them from being used as feedstock in plasma spraying. In-flight measurements reveal that increasing the content of rhenium allows for the higher temperature of particles, though it also reduces their speed.
这项工作的目的是开发一种基于镍铬合金（Ni20Cr）的新型涂层材料，其中铼的含量最高可达50%（重量）。改性是通过将基础粉末与高铼酸铵进行机械混合，随后在氢气气氛中进行热还原实现的。所获得的粉末由镍铬合金芯和铼壳组成。对这些粉末进行了表征，包括其微观结构、相组成、化学成分、密度、流动性、粒度分布和比表面积。研究了等离子体电流强度和氢气流量对飞行中颗粒温度和速度的影响。结果表明，基础镍铬合金（Ni20Cr）与铼壳之间存在相互扩散，从而形成中间固溶体。改性后的粉末具有较高的比表面积和较低的流动性，但这并不妨碍它们用作等离子喷涂的原料。飞行中测量结果表明，增加铼的含量可使颗粒温度升高，不过同时也会降低颗粒速度。
