Self-Consolidation Mechanism of Ti5Si3 Compact Obtained by Electro-Discharge-Sintering Directly from Physically Blended Ti-37.5 at.% Si Powder Mixture

Archives of Metallurgy and Materials

Lee W.H.¹  Yoon Y.H.¹  Cheon Y.W.¹  Chang S.Y.²  Kim J.Y.³  Lee Y.K.³  Kim Y.H.⁴ 

[1] Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul05000, Korea;Korea Aerospace University, Department of Materials Engineering, Goyang-Si 10510, Korea;Uiduk University, Division of Green Energy Engineering, Kyeongju38004, Korea;Wonkwang Health Science University, Department of Dental Laboratory, Iksan54538, Korea;

关键词: Sintering;    Mechanical alloying;    Powder consolidation;    Intermetallic compounds;    Titanium silicide;   

DOI  :  10.1515/amm-2017-0196

来源: DOAJ

【 摘 要 】

Characteristics of electro-discharge-sintering of the Ti-37.5at.% Si powder mixture was investigated as a function of the input energy, capacitance, and discharge time without applying any external pressure. A solid bulk of Ti5Si3 was obtained only after in less than 129 μsec by the EDS process. During a discharge, the heat is generated to liquefy and alloy the particles, and which enhances the pinch pressure can condensate them without allowing a formation of pores. Three step processes for the self-consolidation mechanism during EDS are proposed; (a) a physical breakdown of oxide film on elemental as-received powder particles, (b) alloying and densifying the consolidation of powder particles by the pinch pressure, and (c) diffusion of impurities into the consolidated surface.

【 授权许可】

Unknown