Key Laboratory of Material Corrosion and Protection of Sichuan Colleges and Universities

Zigong, China

Key Laboratory of Material Corrosion and Protection of Sichuan Colleges and Universities

Zigong, China

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Jin Y.,University of Sichuan | Jin Y.,Key Laboratory of Material Corrosion and Protection of Sichuan Colleges and Universities | Liu C.,University of Sichuan | Liu D.,University of Sichuan | Huang B.,University of Sichuan
Nanoscience and Nanotechnology Letters | Year: 2013

WC-Co-Cr3C2-VC nanocomposite powders were prepared by a new precursor method, in which the amorphous oxides-C mixtures were first produced from salt solution containing tungsten, cobalt, vanadium, chromium and carbon elements by air drying and subsequent calcining at 350 °C for 1 h, and secondly reduced and carbonized at 900-1100 °C for 2 h. The nanocomposite powders were characterized by means of XRD and SEM. The results show that the amorphous oxides-C mixtures contribute to reduction of synthesis temperature. During the whole process of powder synthesis, Co element reacts easily with W and C elements to form η phases (such as Co3W 3C, Co6W6C). At 1100 °C for 2 h, the pure-phased WC-Co-Cr3C2-VC nanocomposite powders with granular particle of ~100-200 nm were obtained. The WC/Co sintered alloy using WC-Co-Cr3C2- VC nanocomposite powders as starting materials exhibits ultrafine grain sizes, in comparison with the reference alloy using traditional milled powders. Copyright © 2013 American Scientific Publishers All rights reserved.


Luo C.-S.,University of Sichuan | Luo C.-S.,Key Laboratory of Material Corrosion and Protection of Sichuan Colleges and Universities | Luo H.,University of Sichuan | Luo H.,Key Laboratory of Material Corrosion and Protection of Sichuan Colleges and Universities | And 2 more authors.
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2010

The cracked molybdenum wire in drawing was welded by flash butt welding preheat capacitor discharge in protection gas. The microstructure was observed and the hardness, composition of crystal grain and crystal boundary and the tensile strength of weld zone (including the heat-affected zone) were tested in the different welding forging force. The results showed: the crystal grains of heat-affected zone of doped molybdenum wire was equiaxed, excess forging force could get good welding microstructure and mechanical properties, thus adapt to be draw in protection gas welding.


Jin Y.,University of Sichuan | Jin Y.,Key Laboratory of Material Corrosion and Protection of Sichuan Colleges and Universities | Chen J.,University of Sichuan | Chen J.,Key Laboratory of Material Corrosion and Protection of Sichuan Colleges and Universities | And 5 more authors.
Nanoscience and Nanotechnology Letters | Year: 2014

Styrene-butadiene rubber (SBR) was filled with high-structure carbon black (CB) DZ13 and other reference CBs (N330 and N660) and the compounds were tested for bound rubber content. The chemical functional groups of these CBs were determined by the neutralization titration method. The nanomorphologies of these CBs were observed by atomic force microscope (AFM). It was found that the primary particle of DZ13 is about 50 nm in diameter, almost the same as that of N330 and but less than that of N660. The SBR coating on the surface of DZ13 is smooth and complete. The carboxyl group content, DBP adsorption and N2 adsorption values of DZ13 are rather higher than those of N330 and N660. The measurements of bound rubber at high temperatures in an ammonia atmosphere suggest that bound rubber is caused corporately by physical and chemical adsorption. The high bound rubber content (46.32% at 20C) and extrapolated extraction temperature (about 360C) of DZ13 result mainly from its high structure and surface chemical activity. Copyright © 2014 American Scientific Publishers All rights reserved.


Jin Y.,University of Sichuan | Jin Y.,Key Laboratory of Material Corrosion and Protection of Sichuan Colleges and Universities | Huang B.,University of Sichuan | Liu C.,University of Sichuan | Fu Q.,University of Sichuan
International Journal of Refractory Metals and Hard Materials | Year: 2013

WC-Co-Cr3C2-VC nanocomposite powders were prepared by a new precursor method, in which the amorphous oxides-C mixtures were first produced from salt solution containing tungsten, cobalt, vanadium, chromium and carbon elements by air drying and subsequent calcining at 350 C for 1 h, and secondly reduced and carbonized at high temperature. Phase evolution of the reaction products was investigated systemically. The results show that the amorphous oxides-C mixtures contribute to reduction of synthesis temperature. The phase evolution of tungsten oxides follows mainly WO3 → WO2.9 → WO2.72 → WO2 → W → WC. During the whole process of powder synthesis, Co element reacts easily with W and C elements to form η phases (such as Co3W3C, Co6W6C and Co3W9C4). Synthesis time can promote the formation of WC phase powders, but the elimination of η phases strongly depends on synthesis temperature. At 1100 C for 2 h, the pure-phased WC-Co-Cr3C2-VC nanocomposite powders with granular particle of ∼ 100-200 nm were obtained. The significant grain growth occurs especially at 1300-1400 C. © 2013 Elsevier Ltd. All rights reserved.

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