| Autor: |
Yongqiang Ye, Yaojun Lin, Haoyun Xia, Fei Chen, Qiang Shen |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Journal of Alloys and Compounds. 889:161560 |
| ISSN: |
0925-8388 |
| DOI: |
10.1016/j.jallcom.2021.161560 |
| Popis: |
To minimize WC grain growth and avoid WC-WC non-metallurgical contacts in WC-Co hardmetals, we modified conventional solid-state hot pressing into short-time semi-solid hot pressing (STSSHP) for consolidation of WC-Co powders in the present study. STSSHP can produce fully dense WC-Co hardmetals free of WC-WC non-metallurgical contacts at semi-solid temperatures lower than the ideal liquid-phase sintering temperatures within several to several ten seconds, thus minimizing WC grain growth. Herein WC-8 wt%Co processed by STSSHP at 1340 ℃ (the WC-Co eutectic temperature) for only ~15 s achieved a relative density of 99.92% without WC-WC non-metallurgical contacts. Only slight WC grain growth occurred during STSSHP relative to grain sizes in powders. The STSSHP-ed WC-8 wt%Co exhibited much smaller WC grains and thus higher hardness, fracture toughness and bend strength than those in its liquid-phase sintered counterparts. STSSHP provides a novel avenue to retain fine WC grains and hence to improve both hardness and ductility of WC-Co hardmetals. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect