| Autor: |
Shen, Ting-ting, Xiao, Dai-hong, Ou, Xiao-qin, Song, Min, Li, Xiu-xiu, He, Yue-hui |
| Zdroj: |
Journal of Central South University; Aug2013, Vol. 20 Issue 8, p2090-2095, 6p |
| Abstrakt: |
A solid state synthesis of ultrafine/nanocrystalline WC-10Co composite powders was reported from WO, CoO and carbon powders after reduction and carburization at relatively low temperatures in a short time under pure H atmosphere. The effects of ball milling time and reaction temperature on the preparation of ultrafine/nanocrystalline WC-Co composite powders were studied using X-ray diffraction and scanning electron microscope (SEM). The results show that fine mixed oxide powders (WO, CoO and carbon powders) can be obtained by long time ball milling. Increasing the reaction temperature can decrease the formation of CoWC and graphite phases and increase the WC crystallite size. Long-time ball milling and high reaction temperature are favorable to obtain fine and pure composite powders consisting of nanocrystalline WC from WO, CoO and carbon powders. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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