Abstract
Processing issues of cryomilled WC-VC-Co nanopowders were investigated. A powder mixture of WC-9.8Co-0.8VC-xC was milled at -50°C in liquid nitrogen, using WC-Co balls. The particle sizes of the powders, in the form of agglomerates, were reduced to 18 nm and 13 nm for WC and Co, respectively by this process. The roles of some of the processing parameters such as compacting pressure, reduction of powders, and temperatures for the heating schedule were evaluated at a sintering temperature of 1450°C. The use of CIP resulted in a more uniform microstructure and enhanced mechanical properties: hardness (13-14 GPa) and KIC (12-15 MPam1/2). The findings herein suggest that carbon control and the use of a proper compaction technique were key factors in the successful production of nano-sized WC-Co alloys with no detectable η phase.
| Original language | English |
|---|---|
| Pages (from-to) | 1935-1941 |
| Number of pages | 7 |
| Journal | Materials Transactions |
| Volume | 44 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 2003 Oct |
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
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Processing Issues for Cryomilled WC-Co Nanopowders. / Lee, Gwan Hyoung; Park, Sangho; Kang, Shinhoo; Chung, Kyung Hyun; Lavernia, Erique J.
In: Materials Transactions, Vol. 44, No. 10, 10.2003, p. 1935-1941.Research output: Contribution to journal › Article
TY - JOUR
T1 - Processing Issues for Cryomilled WC-Co Nanopowders
AU - Lee, Gwan Hyoung
AU - Park, Sangho
AU - Kang, Shinhoo
AU - Chung, Kyung Hyun
AU - Lavernia, Erique J.
PY - 2003/10
Y1 - 2003/10
N2 - Processing issues of cryomilled WC-VC-Co nanopowders were investigated. A powder mixture of WC-9.8Co-0.8VC-xC was milled at -50°C in liquid nitrogen, using WC-Co balls. The particle sizes of the powders, in the form of agglomerates, were reduced to 18 nm and 13 nm for WC and Co, respectively by this process. The roles of some of the processing parameters such as compacting pressure, reduction of powders, and temperatures for the heating schedule were evaluated at a sintering temperature of 1450°C. The use of CIP resulted in a more uniform microstructure and enhanced mechanical properties: hardness (13-14 GPa) and KIC (12-15 MPam1/2). The findings herein suggest that carbon control and the use of a proper compaction technique were key factors in the successful production of nano-sized WC-Co alloys with no detectable η phase.
AB - Processing issues of cryomilled WC-VC-Co nanopowders were investigated. A powder mixture of WC-9.8Co-0.8VC-xC was milled at -50°C in liquid nitrogen, using WC-Co balls. The particle sizes of the powders, in the form of agglomerates, were reduced to 18 nm and 13 nm for WC and Co, respectively by this process. The roles of some of the processing parameters such as compacting pressure, reduction of powders, and temperatures for the heating schedule were evaluated at a sintering temperature of 1450°C. The use of CIP resulted in a more uniform microstructure and enhanced mechanical properties: hardness (13-14 GPa) and KIC (12-15 MPam1/2). The findings herein suggest that carbon control and the use of a proper compaction technique were key factors in the successful production of nano-sized WC-Co alloys with no detectable η phase.
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U2 - 10.2320/matertrans.44.1935
DO - 10.2320/matertrans.44.1935
M3 - Article
AN - SCOPUS:0344253985
VL - 44
SP - 1935
EP - 1941
JO - Materials Transactions
JF - Materials Transactions
SN - 0916-1821
IS - 10
ER -