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INDUCTION PLASMA REACTIVE DEPOSITION OF TUNGSTEN CARBIDE FROM TUNGSTEN METAL powder

Acta Metallurgica Sinica(English Letters) 2001年第5期14卷 352-358页

作者： X.L. Jiang Institute of Surface and Coatings Technology, Central South University, Changsha 410083, China M.I. Boulos Department of Chemical Engineering, University of Sherbrooke, Sherbrooke, J1K 2R1, Canada Central South Univ. Changsha 410083 China

Experimental results on the primary carburization reaction between the tungsten powder and methane in the induction plasma, and the secondary carburization of the deposit on substrate at high temperature are reported. Optical microscopy and scanning electron microscopy were used to examine the microstructures of starting tungsten powder, carburized powder, and deposit. X-ray diffraction analysis, thermal gravimetric analysis and microhardness measurement were used to characterize the structures and properties of the powder and the deposit. It is found that the primary carburization reaction in the induction plasma starts from the surface of tungsten particles when the particles are melted. Tungsten particles are partially carburized inside the reactive plasma. Complete carburization is achieved through the secondary carburization reaction of the deposit on substrate at high temperature.

关键词： Carburizing Deposition Methane powder metals Tungsten Tungsten carbide

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SYNTHESIS AND SOLID STATE SINTERING OF W-Ni-Fe NANO-COMPOSITE powderS

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Acta Metallurgica Sinica(English Letters) 2000年第3期13卷 917-920页

作者： Qu, X.H. Fan, J.L. Li, Y.M. Huang, B.Y. Central South Univ of Technology Changsha China

The mixture of 90 wt%W, 7 wt%Ni and 3 wt%Fe elemental powders was milled in a planetary high-energy ball mill. The evolution of the structure during milling and the sintering behavior of the milled powders were tested. The results showed that by mechanical alloying W(Ni, Fe) supersaturated solid solution with nano-meter size formed, which can enhance the sintering process. Fully dense alloy from the milled powders was obtained through solid state sintering. The tensile strength of the obtained alloy is over 900 MPa which is comparable to that of the alloy sintered by traditional liquid-phase sintering from un-milled powders of the same composition.

关键词： Tungsten alloys Nickel alloys Iron alloys Mechanical alloying powder metals Sintering Morphology Tensile strength

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