Plasma spheroidization of nickel powders in a plasma reactor

Bulletin of materials science

V Selvarajan¹  G Shanmugavelayutham¹ 

[1] Department of Physics, Bharathiar University, Coimbatore 641 046, India$$Department of Physics, Bharathiar University, Coimbatore 641 046, IndiaDepartment of Physics, Bharathiar University, Coimbatore 641 046, India$$

关键词: Thermal plasma;    spheroidization;    nickel.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Thermal spray coatings of surfaces with metal, alloy and ceramic materials for protection against corrosion, erosion and wear is an intense field of research. The technique involves injection of the powder into a plasma flame, melting, acceleration of the powder particles, impact and bonding with the substrate. Feedstock powders of metals, alloys and ceramics for thermal spray applications have to meet several requirements. Particle shape, size and its distribution, powder flow characteristics and density are the important factors to be considered in order to ensure high spray efficiency and better coating properties. For smooth and uniform feeding of powders into plasma jet, the powder particles have to be spherical in shape. High temperatures and steep temperatures present in thermal plasma is exploited to spheroidize particles in the present investigation. Nickel powder particles in the size range from 40�??100 𝜇m were spheroidized using plasma processing. SEM and optical micrographs showed spherical shape of processed particles.

【 授权许可】

Unknown