Jinduicheng Molybdenum Industry Ltd Company

Fengcheng, China

Jinduicheng Molybdenum Industry Ltd Company

Fengcheng, China

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Feng P.,Jinduicheng Molybdenum Industry Ltd Company | Feng P.,Xi'an Jiaotong University | Liu R.,Jinduicheng Molybdenum Industry Ltd Company | Zhao H.,Jinduicheng Molybdenum Industry Ltd Company | And 3 more authors.
Fenmo Yejin Jishu/Powder Metallurgy Technology | Year: 2011

By mechanical alloying, high-energy mechanochemistry, chemical synthesis + high-energy ball milling, MoSi2 powder was synthesized. Its chemical composition and phases were analyzed. The results show that by chemical synthesis + high energy ball milling, high-purity MoSi2 powder can be efficiently synthesized. The mixed powder of MoO3, SiC and carbon with x(Mo):x(Si):x(C)=1:3:7 (atomic ratio) is reduced at 1200°C for 12 h in the corundum tube furnace, using mixed gas of 50%Ar-50%H2 as reductant. The reaction product is MoSi2-SiO2 powder mixture, which is immersed in hydrofluoric acid solution to remove SiO2 powder. Then pure MoSi2 powder is milled for 4 h by high-energy ball to change its morphology and particle size distribution.


Feng P.,Jinduicheng Molybdenum Industry Co. | Feng P.,Xi'an Jiaotong University | Fu J.,Jinduicheng Molybdenum Industry Co. | Liu R.,Jinduicheng Molybdenum Industry Co. | And 3 more authors.
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2011

The sensitivity of the microstructure and mechanical properties of as-worked Mo-La alloy wires to the La content was studied. The results showed that with the increase of La content, the microstructure and mechanical properties of as-worked Mo-La alloy wires were scarcely improved, which was entirely different from the phenomenon that the toughening effect of annealed Mo-La alloy wires changed with the different La content. The fact was due to the occurrence status of La element in Mo alloy wires and the timing sequence characteristics during its transformation process. The grain refinement and dislocation pinning effects of Mo-La alloy wire depended greatly on the quantity of La2O3 particles and their dispersity in molybdenum substrate. XRD patterns showed that Mo-La alloy powders, which were obtained by the reduction of the solid-liquid doped MoO2, were composed of Mo atoms and La2Mo2O7. In the subsequent thermomechanical processing of as-worked Mo-La alloy wires, La2O3 particles were gradually generated by the combination between La3+ ions and free oxygen atoms or the decomposition of La2Mo2O7. The thermomechanical processing was unable to make all of La3+ ions became La2O3, resulting in that the generation of La2O3 particles lagged largely behind the termination of the whole process, so the microstructure and mechanical properties of the alloy wires were not obviously sensitive to the La addition level.


Feng P.,Jinduicheng Molybdenum Industry Ltd Company | Feng P.,Xi'an Jiaotong University | Liu R.,Jinduicheng Molybdenum Industry Ltd Company | Zhao H.,Jinduicheng Molybdenum Industry Ltd Company | And 3 more authors.
Fenmo Yejin Jishu/Powder Metallurgy Technology | Year: 2011

The effect and mechanism of the addition of La, Si on the microstructure and mechanical properties of molybdenum wire were explored through the systematic experiments, and the composition of Mo-Si-La alloy wire with excellent mechanical properties was optimized, i.e., Mo-0.15Si-(0.5~0.8)La. Mo3Si and Mo5Si3 particles, which are produced through the in-situ reaction of MoSi2 and Mo, play excellent effects of grain refinement and dispersion strengthening. La2O3 particles make the formation and spread of micro-cracks delayed. In the Mo-Si-La alloy, the presence of molybdenum silicide particles contributes to the more dispersion uniformity of La2O3 particles, so the latter's toughening effects are more significant.

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