Effect of glow discharge sintering in the properties of a composite material fabricated by powder metallurgy

3rd International Meeting for Researchers in Materials and Plasma Technology; 1st Symposium on Nanoscience and Nanotechnology

物理学;材料科学

Cardenas, A.^1 ; Pineda, Y.^2 ; Santos, A. Sarmiento^2 ; Vera, E.^2

Universidade Federal Do Rio de Janeiro, Rio de Janeiro, Brazil^1

Universidad Pedagógica y Tecnológica de Colombia, Tunja, Colombia^2

关键词: 316 stainless steel;    Abnormal glow discharge;    Composite samples;    Different proportions;    Discharge sintering;    Inert atmospheres;    Matrix reinforcement;    Sintered density;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/687/1/012025/pdf
DOI  :  10.1088/1742-6596/687/1/012025

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Composite samples of 316 stainless steel and SiC were produced by powder metallurgy. Starting materials were mixed in different proportions and compacted to 700MPa. Sintering stage was performed by abnormal glow discharge plasma with direct current in an inert atmosphere of argon. The process was conducted at a temperature of 1200°C±5°C with a heating rate of 100°C/min. This work shows, the effectiveness of plasma sintering process to generate the first contacts between particles and to reduce vacancies. This fact is confirmed by comparing green and sintered density of the material. The results of porosity show a decrease after plasma sintering. Wear tests showed the wear mechanisms, noting that at higher SiC contents, the wear resistance decreases due to poor matrix-reinforcement interaction and by the porosity presence which causes matrix-reinforcement sliding.