TY - JOUR
T1 - Synergetic migration behavior of la and Ce and related microstructure character of Cr-V-RE co-doped WC-Co alloy
AU - Zhang, Li
AU - Tang, Wei
AU - Chen, Shu
AU - Nan, Qing
AU - Xie, Mingwei
N1 - Funding Information:
Foundation item: Project supported by National Natural Science Foundation of China (51074189, 50823006), Science and Technology Planning Project Founda-tion of Hunan Province, China (2010FJ2006), Research Foundation for the Doctoral Program of Higher Education of China (20100162110001), and the National Science & Technology Special Foundation of China (2011BAE09B02, 2012ZX04003021) Corresponding author: ZHANG Li (E-mail: [email protected]; Tel.: +86-731-88876424)
PY - 2012/5
Y1 - 2012/5
N2 - The as-sintered sinter skin and the polished section of WC-11Co-0.4Cr 3C2-0.3VC-0.2RE (RE=mischmetal with La/Ce ratio of 0.65) alloy were analyzed. It was shown that the microstructures on the skin and in the inner part of the alloy were all characterized with a WC+β+M structure, where β was a cobalt-based binder phase and M represented a RE-containing phase. There existed an inward diffusion of S atoms, which caught and fixed the Ce atoms in the alloy and an outward diffusion of La atoms during the sintering process. Consequently, the M phase was characterized with the decreased La/Ce ratio (0.59) in the inner part and the increased La/Ce ratio (1.01) on the skin. The M phase on the skin was characterized with a γ-Ce2S 3 type structure. To suppress the long range migration of rare earth to the skin, S in the sintering atmosphere had to be eliminated.
AB - The as-sintered sinter skin and the polished section of WC-11Co-0.4Cr 3C2-0.3VC-0.2RE (RE=mischmetal with La/Ce ratio of 0.65) alloy were analyzed. It was shown that the microstructures on the skin and in the inner part of the alloy were all characterized with a WC+β+M structure, where β was a cobalt-based binder phase and M represented a RE-containing phase. There existed an inward diffusion of S atoms, which caught and fixed the Ce atoms in the alloy and an outward diffusion of La atoms during the sintering process. Consequently, the M phase was characterized with the decreased La/Ce ratio (0.59) in the inner part and the increased La/Ce ratio (1.01) on the skin. The M phase on the skin was characterized with a γ-Ce2S 3 type structure. To suppress the long range migration of rare earth to the skin, S in the sintering atmosphere had to be eliminated.
KW - La and Ce synergetic migration
KW - cemented carbide
KW - rare earth diffusion
KW - sintering
KW - sulfur
UR - https://www.scopus.com/pages/publications/84862511214
U2 - 10.1016/S1002-0721(12)60076-3
DO - 10.1016/S1002-0721(12)60076-3
M3 - Article
AN - SCOPUS:84862511214
SN - 1002-0721
VL - 30
SP - 480
EP - 485
JO - Journal of Rare Earths
JF - Journal of Rare Earths
IS - 5
ER -