BGRIMM Advanced Materials Science and Technology Co.

Beijing, China

BGRIMM Advanced Materials Science and Technology Co.

Beijing, China
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Wang D.-F.,University of Science and Technology Beijing | Zhang B.-P.,University of Science and Technology Beijing | Jia C-C.,University of Science and Technology Beijing | Gao F.,Beijing General Research Institute of Mining And Metallurgy | And 6 more authors.
Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy | Year: 2016

In the present work, three experimental WC-17 Co plasma sprayed coatings were developed from submicrostructured, conventional and bimodal (composing of 30 wt.% submicrostuctured and 70 wt.% conventional WC grain) agglomerated powder. The effect of carbide size distribution on the microstructure, phase structure and properties such as microhardness, fracture toughness and sliding wear performance of three coatings were measured. The experimental results indicated that bimodal coating had little porosity of microstructure with lower degree of decarburization of the WC phase to W2C and Co6W6C phases, consequently, showed both high microhardness and fracture toughness, e.g. the microhardness is similar to that of the submicrostuctured one and the fracture toughness is comparable to that of the conventional one. The coefficient of friction for the coatings decreased slightly with increasing test load, and that friction coefficient of bimodal coating was lower than the other ones. The wear loss of both submicrostuctured and conventional coatings were higher than the bimodal coating and increased with increasing test load. The microscopic analyses of the wear surface showed the cobalt extrusion followed by carbide fracture, or pulled out were the predominant failure mechanism. Besides that, fatigue cracking of the submicrostuctured coating at a high test load played an importance on the wear mechanism.


Wang A.-D.,Beijing General Research Institute of Mining And Metallurgy | Wang A.-D.,BGRIMM Advanced Materials Science and Technology Co. | Liu Z.-Y.,CAS Institute of Physics | Zhang P.-J.,CAS Institute of Physics | And 3 more authors.
Wuli Xuebao/Acta Physica Sinica | Year: 2013

The resistance relaxation in Au/SrTiO3/Au sandwiches with bipolar resistance switching has been investigated by the low frequency analysis. The power spectral density of the conducting current fluctuation in the high resistance state and the low resistance state shows 1/f behaviors. By contrast experiment, the low frequency noise for the high resistance state is ascribed to the Schottky barrier under reverse bias and the oxygen vacancy diffusion, while the noise in the low resistance state is due to the carriers fluctuation arising from the oxygen vacancy migration. The resistance relaxation can be further understood as the diffusion of oxygen vacancies under an electric field. © Chinese Physical Society.


Gao F.,Beijing General Research Institute of Mining And Metallurgy | Gao F.,BGRIMM Advanced Materials Science and Technology Co. | Gao F.,Strengthen | Xu H.,Beijing General Research Institute of Mining And Metallurgy | And 5 more authors.
Fenmo Yejin Jishu/Powder Metallurgy Technology | Year: 2014

Cr7C3-NiCr and Cr23C6-Ni coatings were deposited by high velocity oxy-fuel processes, and were comparis with Cr3C2-NiCr coating. The microstructure of the coating was analyzed by scanning electron microscopy(SEM). The microhardness and thermal shock property were measured. The results indicate that the grain size of Cr7C3-NiCr coatings is 0.5~2 μm and the hardness Hv0.3 of the coating is 8.53 GPa. The times of water quenching at 950℃ for Cr7C3-NiCr coatings are more than 113, they are better than Cr3C2-NiCr and Cr23C6-Ni coatings. ©, 2014, Beijing Research Institute of Powder Metallurgy. All right reserved.

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