Shizuishan, China
Shizuishan, China

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Wang H.,Beifang University of Nationalities | Chen Y.,Beifang University of Nationalities | Bai Z.,CNMC Ningxia Orient Group Co. | Zhao B.,University of Queensland | And 2 more authors.
International Journal of Refractory Metals and Hard Materials | Year: 2017

Subsolidus relations and liquidus boundaries in the Ta2O3-WO3-SiO2 system at temperatures ranging from 1200 °C to 1500 °C were investigated. Phase diagrams were constructed. Compounds with stoichiometries of Ta22W4O67, Ta2WO8 and Ta16W18O94 formed in the Ta2O5-WO3 subsystem at 1200 °C. SiO2 was compatible with each of the compounds. A solid solution with a formula of (1 − x) Ta2O5·xWO3 formed on the Ta2O5-WO3 line in the compositional range of Ta2O5:WO3 > 11:4. SiO2 had a maximum solubility of 25% SiO2 in the solid solution. Liquid phase first appeared in the WO3-rich corner at 1300 °C. As the temperature was increased up to 1500 °C, the liquidus area boundary gradually expanded towards the SiO2- and the Ta2O5-rich corners. © 2017 Elsevier Ltd

Zhong J.-M.,Institute of North West Rare Metal Materials | Zhong J.-M.,CNMC Ningxia Orient Group Co. | Sun B.-S.,Institute of North West Rare Metal Materials | Sun B.-S.,CNMC Ningxia Orient Group Co. | Wang D.-X.,Institute of North West Rare Metal Materials
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2014

The effects of additives, pH value and solid content on the stability and rheology of indium tin oxide (ITO) slurry were studied, and the effect of slip casting pressure on the bulk density was investigated. The results show that the slurry with 70% ITO solid content (mass fraction) is very stable and easy to form the ITO green-body with a relative density of 68% under casting pressure of 1.5 MPa when the parameters of forming slurry are fixed at w(PAA)=0.5% (PAA is polyacrylic acid), w(PEG)=1.5% (PEG is polyethylene glycol) and pH=9. The ITO target materials with relative density higher than 99.5% are achieved using the green-body mentioned above by pressureless sintering. The structure of ITO target material is the cubic structure of indium oxide, and the grain size and the elements of In, Sn and O well distribute. The ITO target materials reach the quality for the application in G8 TFT-LCD production line. ©, 2014, Science Press. All right reserved.

He J.,CNMC Ningxia Orient Group Co. | Zhang X.,Ningxia Orient Tantalum Industry Co. | Yang G.,Ningxia Orient Tantalum Industry Co. | Zheng A.,Ningxia Orient Tantalum Industry Co.
Materials China | Year: 2014

This paper cites the characteristics of tantalum capacitors, applications and application characteristics of aluminum capacitors and multilayer ceramic capacitors. It analyzes the new trends that the chip-based and miniaturization tantalum capacitors led capacitor grade tantalum powder to higher capacity. It describes the challenges of the demand for high reliability in high-voltage tantalum powder of aviation, aerospace and military field voltage capacitor to a higher voltage and lower ESR direction. It reviews the application development process of the capacitor tantalum powder with high capacitance tantalum powder, high voltage tantalum powder and medium voltage (flake) tantalum powder. It analyzes the performance, product grades and key technologies of high capacitance tantalum powder, high voltage tantalum powder and medium voltage(flake) tantalum powder by methods of the classical methods of potassium tantalum fluoride (K2TaF7) sodium metal reduction, electron beam melting and ball milled production. For 30~80 kμFV/g tantalum powder, the influence factors of withstand voltage performance have been analyzed. Finally, it presents new technologies, devices, products morphology, performance, advantages and disadvantages of the high capacitance tantalum powder and high voltage technology. On the basis of capacitor grade tantalum powder, this paper points out sustainable development ideas of higher capacitance and higher voltage for tantalum capacitors. ©, 2014, Materials China. All right reserved.

Zhong J.,CNMC Ningxia Orient Group Co. | Zhou X.,Ningxia Orient Tantalum Industry Co. | Zhao G.,Ningxia Orient Tantalum Industry Co. | Yang G.,Ningxia Orient Tantalum Industry Co.
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2016

The high-temperature oxidation resistance coatings were prepared by slurry firing on the surface of Nb-W alloy which was used in the field of aerospace engine.The fracture of the coating and the morphology of the sprayed layer were investigated by scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectroscopy. The forming reason of surface defects, color difference and the influence of color difference of coatings on their properties and surfaces in high-temperature aerobic environment were researched based on the above analyses. It was found that the color-different coating was the result of outer silicide enrichment. By the research on the coatings which had color difference, it was found that the color difference appeared due to excess slurry. The excess slurry generated silicide and the silicide enriched on the surface coating. The coating formed grains different from those of normal coating, resulting in the color difference, but the color difference had no effect on its performance, overall thickness and surface quality. It existed on the surface of the coating without changing the structure and composition of other levels. High temperature oxygen atmosphere test found that there was no difference of high temperature properties for coatings with or without color difference, which indicated that color difference did not change the high temperature properties of the coatings. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.

Li F.-C.,CNMC Ningxia Orient Group Co.
Gongneng Cailiao yu Qijian Xuebao/Journal of Functional Materials and Devices | Year: 2012

In this paper is Graphite material Tantalum electrolytic capacitors The manganese dioxide cathode layer Coating use as background Respectively discuss Different graphite solid content of the sample data capacity contrast Curing temperature, etc. Under the experimental conditions Graphite material Tantalum electrolytic capacitors Electrical parameters of the contrast between the impact The test results show that: Graphite solids content 5.0±X%, Curing temperature 165±y°C/45 min is Graphite as the cathode material used in the top coating process conditions Sample electrical parameters improved significantly And the use of the process as a cathode material The graphite solution PH value size is very important and Affect Tremendous PH value of about 11 to 13 use the ideal parameters.

Ma J.,CNMC Ningxia Orient Group CO. | Zhang Y.,CNMC Ningxia Orient Group CO.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2014

Due to the problems in the serious segregation tendency and poor strip microstructure, performance uniformity as well as the low service life of elastic components, it is a acceptable choice for C64780 alloy substituted for the phosphor bronze. Compared with the phosphor bronze, C64780 alloy as silicon bronze alloy, is the equivalent in density, melting temperature, fatigue life, strength and hardness, and is superior in resistance stress relaxation and more high conductive/thermal conductivity as well as softening temperature. C64780 alloy can decrease the cost of raw materials and control the processing costs, and greatly improve the problems from the use of the phosphor bronze.

Li C.,Xi'an University of Technology | Li C.,CNMC Ningxia Orient Group Co. | Wang F.,Xi'an University of Technology | Wang F.,CNMC Ningxia Orient Group Co. | And 2 more authors.
Materials China | Year: 2013

In recent years, some researchers have carried out many studies on Al doped ZnO thin films with additive elements and found that the properties of AZO thin films with additive elements are better than those of AZO thin films. The research achievements mentioned above are summarized and the basic structure and optoelectronic properties of AZO thin films are introduced. The basic structure and optoelectronic properties of AZO thin films with additive elements are described and compared with those of AZO thin films. The main preparation technology and advancement of additive elements doped AZO thin films are reported and the developments and the research trends of additive elements doped AZO thin films are prospected. The three main technologies of magnetron sputtering, sol AZO film additive elements mixed into the gel and pulsed laser deposition technique and its advantages and disadvantages are summarised, and the research progress of different methods of AZO thin film doped with the elements are expounded. Finally, the authours introduce the application of AZO thin film doped additive elements in the field of optoelectronics, the prospect of its future development and research trend.

Tang Y.,University of Science and Technology Beijing | Kang Y.,University of Science and Technology Beijing | Yue L.,CNMC Ningxia Orient Group Co. | Jiao X.,CNMC Ningxia Orient Group Co.
Materials and Design | Year: 2015

The paper investigated the effect of two aging processes (i.e. normal aging and interrupted aging) on the microstructure and mechanical properties of a Cu-Be-Co-Ni alloy. The results of tensile and Kahn tear tests showed that the interrupted aging (IA) process could significantly improve the uniform elongation and plane stress fracture toughness with tiny decrease in ultimate tensile strength, when compared with the results from normal aging (NA) process. Under the scanning electron microscope, the fracture surface of samples treated by NA followed the intergranular fracture, while that of the samples treated by IA followed the transgranular fracture. The transmission electron microscope study revealed the differences between the microstructure of the alloy treated by NA and IA processes. After the NA process, the slender strip of γ' precipitates aggregated at grain boundaries with a length of approximately 10 to 45. nm; the disk-shaped γ″ precipitates in the alloy treated by IA distributed homogenously throughout whole grains with a length of about 3 to 10. nm. The discussion of strengthening mechanisms demonstrated that the mechanism of precipitate shearing by dislocations made a contribution to the strengthening of the alloy treated by IA, while the Orowan mechanism was the dominant strengthening mechanism in the alloy treated by NA. © 2015 Elsevier Ltd.

Tang Y.-C.,University of Science and Technology Beijing | Kang Y.-L.,University of Science and Technology Beijing | Yue L.-J.,CNMC Ningxia Orient Group Co. | Jiao X.-L.,CNMC Ningxia Orient Group Co.
Acta Metallurgica Sinica (English Letters) | Year: 2015

In this paper, the evolutions of microstructure and mechanical properties of Cu-1.9Be-0.3Ni-0.15Co alloy were studied. The alloys in the condition of the solution treated (soft state) and 37% cold rolled (hard state) were aged at 320 °C for different time, respectively. The mechanical properties, electrical conductivity and microstructure of the alloy aged for different time were analyzed. Additionally, the precipitation kinetics of Cu-1.9Be-0.3Ni-0.15Co alloys was investigated. X-ray diffraction and transmission electron microscopy results reveal that both continuous precipitation and discontinuous precipitation existed in the hard-state Cu-1.9Be-0.3Ni-0.15Co alloy during the whole aging process; the sequence of continuous precipitation is G.P. zone → γ" → γ' → γ. Furthermore, the precipitation transformation mechanism of softstate alloy is homogeneous nucleation, while hard-state alloy shows the heterogeneous nucleation (interface nucleation) with the nucleation rate of both states decaying rapidly to zero during aging at 320 °C. © The Chinese Society for Metals and Springer-Verlag Berlin Heidelberg 2015.

Tang Y.,University of Science and Technology Beijing | Zhu G.,University of Science and Technology Beijing | Kang Y.,University of Science and Technology Beijing | Yue L.,CNMC Ningxia Orient Group Co. | Jiao X.,CNMC Ningxia Orient Group Co.
Journal of Alloys and Compounds | Year: 2016

The fatigue crack growth (FCG) behaviors of Cu-Be-Co-Ni alloy subjected to interrupted aging (IA), normal aging (NA) and overaging (OA) treatment were discussed. The distinctions in microstructure of the alloys after various aging treatments led to different FCG behaviors. In order to understand the different FCG behaviors, a model based on the reversible plastic zone (RPZ) size and microstructural factors was applied in this study. At the relatively low stress intensity factor range (ΔK < 17 MPa m1/2), the RPZ size of each sample was smaller than the corresponding grain size, so the fatigue crack propagated inside the grain and adjacent to the grain boundaries (GBs). For the IA alloy, fine and coherent γ″ precipitates which could be sheared by dislocations promoted the fatigue crack resistance, leading to the decrease of FCG rate. When the value of stress intensity factor range becomes higher (ΔK > 21 MPa m1/2), the RPZ size of each sample was 1-2 times of the corresponding grain size. Consequently, the crack trended to grow along GBs. For the OA alloy, the crack propagated along the interfaces between the discontinuous precipitation (DP) cells and parent phase. The tortuous interfaces hindered the propagation of the fatigue cracks, resulting in the reduction of FCG rate. © 2015 Elsevier B.V.

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