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Poster

Enhanced hardness in pure copper processed by mechanical milling and spark plasma sintering

Sunday (01.01.2040)
00:00 - 09:41
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Session Postersession
Belongs to:


Pure copper powder was mechanically milled (MMed) using a vibration type ball mill, and the obtained powder was consolidated into bulk materials by the spark plasma sintering (SPS). Changes in hardness and solid-state reactions of the MMed powder and bulk materials have been examined by Vickers hardness measurements and X-ray diffraction (XRD), respectively.

The value of Vickers microhardness for the pure copper powders increased from 40 to 111 HV after the MM time from 0 to 8 h, respectively, and exhibited a broad hardness plateau at maximum hardness after MM time up to 32 h. The solid-state reaction between the MMed powder and stearic acid added as a process control agent (PCA) during the MM process was observed to form Cu2O.

The Vickers hardness of the bulk materials fabricated from 0 h and 32 h MMed pure copper powders exhibited 40 HV and 230 HV, respectively. The solid-state reaction between the MMed pure copper powder and stearic acid added as a process control agent (PCA) during SPS process after MM process was observed to form Cu2O. The MMed powders produced by 16 h and 32 h of MM process contained a little amount of Fe as a contamination, and the bulk materials fabricated from the powders containing Fe were generated to form Fe3O4. MM-SPS process can be appreciable to produce the bulk copper materials exhibiting high hardness.

Speaker:
Prof. Masahiro Kubota
Nihon University