Fuda Alloy Materials Co.

Wenzhou, China

Fuda Alloy Materials Co.

Wenzhou, China
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Pang Y.,Central South University | Xia C.,Fuda Alloy Materials Co. | Wang M.,Central South University | Wang M.,Key Laboratory of Nonferrous Metal Materials Science and Engineering | And 6 more authors.
Journal of Alloys and Compounds | Year: 2014

The properties and microstructure of Cu-Cr alloy with Zr and (Ni, Si) additions were investigated. Improvements of peak-hardness and softening resistance are achieved with Zr and (Ni, Si) additions in the Cu-Cr alloy, while only a slight decrease in conductivity is brought out. Good balance of hardness and electrical conductivity, which reach to 177 HV and 82.2% IACS respectively, can be obtained in the Cu-Cr-Zr-Ni-Si alloy after 80% cold rolling and 450 C aging for 360 min. The solutes-rich particles in cast microstructure and aged precipitates are refined and homogeneously distributed with the addition of alloying elements. Stacking fault energy of the Cu-Cr alloy decreases with the additions of Zr and (Ni, Si) elements, leading to easy and extensive occurrence of stacking faults and twins. Precipitate morphology of Cu-Cr alloy can be modified by the additions of alloying elements, which is associated with the interface energy of precipitates in the over-aged Cu-Cr-Zr and Cu-Cr-Zr-Ni-Si alloy. © 2013 Elsevier B.V. All rights reserved.


Xie J.,Fuda Alloy Materials Co. | Xie J.,Central South University | Cao S.,Central South University | Bai X.,Fuda Alloy Materials Co. | And 3 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2014

This work shows the feasibility of cold gas-spray technique for the manufacturing of industrial electrical contact materials. Microstructure and mechanical properties of the material were investigated using optical microscopy, scanning electron microscopy, hardness test and shearing test. Results show that the bonding strength of the material is determined by the hardness of substrates. High hardness results in low bonding strength. Bonding strength of AgSnO2 sprayed onto aluminum is the best, followed by copper and brass. The bonding strength of silver graphite is not as good as that of silver tin-oxide. The most appropriate particle size is 20 μm for a bulk particle according to the optimization. Copyright © 2014, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.


Wu C.P.,Central South University | Yi D.Q.,Central South University | Goto S.,Akita University | Xu C.H.,Central South University | And 3 more authors.
Materials and Corrosion | Year: 2014

The oxidation behavior of Ag-5.08Sn-3.15Sb and Ag-6.84Sn-1.25Sb alloy powders was investigated in air at 800 °C. The thermal gravimetric analysis (TGA) results confirmed that the starting oxidation temperature of Ag-5.08Sn-3.15Sb and Ag-6.84Sn-1.25Sb alloy powders was 670 and 720 °C, respectively. The oxidation kinetic results suggested that the oxidation behavior of Ag-Sn-Sb alloy followed a parabolic rate and the oxidation rate of Ag-5.08Sn-3.15Sb alloy powders was 3.2 times larger than that of Ag-6.84Sn-1.25Sb alloy powders. XRD results indicated that the formed Sb 2O3 would react with the Ag matrix forming AgSbO 3. SEM-EDS observations indicated that the formed oxideswere primarily distributed on the grain boundaries and the formed AgSbO3 particles nailed into the SnO2 particles. In addition, the oxidationmechanism of Ag-Sn-Sb alloy powders and the effect of Sb on oxidation behavior of Ag-Sn alloy powders were also discussed. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Wu C.,Central South University | Wu C.,FuDa Alloy Materials Co. | Yi D.,Central South University | Weng W.,FuDa Alloy Materials Co. | And 3 more authors.
Materials and Design | Year: 2015

Ag/Ni electrical contact materials tend to be weld together under high current and/or high temperature, which was a key problem to restrict the usage of Ag/Ni electric contact materials. Arc erosion characteristics of Ag/12Ni electrical contact material after 50,000 operations under direct current 19 V, 20. A and resistive load conditions were investigated. The result indicated that the probability distribution and change trend of arc energy and arc time during 50,000 operations were similar and the relationship between arc time and arc energy followed exponential function. On the one hand, "Crater" type erosion pit, island-like melted silver, pore, crack and coral-like structure spitting were observed on erosion surface of Ag/Ni contact materials. On the other hand, distribution of Ag and Ni element on molten pool of movable contact was different from that of stationary contact. For movable contact, element Ni mainly distributed on melted pool root, whereas element Ag mainly distributed inside of melted pool. For stationary contact, however, element Ni and Ag distributed layer by layer. Furthermore, arc erosion of stationary contact is more serious than that of movable contact. © 2015 Elsevier Ltd.


Song Z.,Fuda Alloy Materials Co. | Zhang X.,Fuda Alloy Materials Co. | Bai X.,Fuda Alloy Materials Co. | Wei W.,Fuda Alloy Materials Co.
Electrical Contacts, Proceedings of the Annual Holm Conference on Electrical Contacts | Year: 2015

The transport of liquid metal throughout skeleton is the core process of infiltration of contact material. In the case of silver tungsten carbide (AgWC), we discussed the mechanism of liquid silver (Ag) transport based on the morphology of product structure after each manufacturing process recorded by scanning electron microscope. Analysis shows that the transport of liquid Ag is mainly influenced by the 'transport dynamic', which is determined by interfacial energy between Ag and tungsten carbide (WC), and the 'transport corridor', which represents the distribution of the pore network in skeleton. It is shown that either to enhance the 'transport dynamic' or to broaden the 'transport corridor' will significantly improve the infiltration process, therefore increase the anti-erosion ability of AgWC material. © 2015 IEEE.


Wu C.,Central South University | Yi D.,Central South University | Xu C.,Central South University | Zhou J.,Central South University | Weng W.,Fuda Alloy Materials Co.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2013

The microstructure of Ag-Sn-La alloy powder after oxidation was investigated by XRD, OM and SEM. The results show that Ag, SnO2 and La2Sn2O7 phases are formed in Ag-Sn-La alloy powder after oxidation. Ag-Sn-La alloy powder has different oxidation kinetic characters, oxidation microstructures and oxidation mechanisms due to the different contents of alloying agent. The starting oxidation temperature of Ag-5.2Sn-3.4La alloy powder is 350°C and the oxidation velocity is fast. Both element Sn and La are oxidized in situ and strip oxides are formed due to the fast oxidation of element La during the oxidation of Ag-5.2Sn-3.4La alloy powder. The oxidation velocity of Ag-6.87Sn-1.28La alloy powder is slow when the temperature is from room temperature to 300°C and that is fast when the temperature is above 300°C. Both element Sn and La are oxidized in situ and the formed oxides are uniformly distributed in the silver matrix. The starting oxidation temperature of Ag-9.26Sn-0.44La alloy powder is 567°C and the oxidation velocity is slow. Element La is oxidized in situ and element Sn diffuses from the inner to the surface due to the driving of concentration gradient. La oxides are uniformly distributed in the silver matrix and Sn oxides are mainly distributed on the grain boundary after Ag-9.26Sn-0.44La alloy powder oxidation.


Wu C.-P.,Central South University | Wu C.-P.,FuDa Alloy Materials Co. | Yi D.-Q.,Central South University | Weng W.,FuDa Alloy Materials Co. | And 2 more authors.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2016

Arc erosion morphologies of Ag/MeO(10) electrical contact materials after 50000 operations under direct current of 19 V and 20 A and resistive load conditions were investigated using scanning electron microscope (SEM) and a 3D optical profiler (3DOP). The results indicated that 3DOP could supply clearer and more detailed arc erosion morphology information. Arc erosion resistance of Ag/SnO2(10) electrical contact material was the best and that of Ag/CuO(10) was the worst. Arc erosion morphology of Ag/MeO(10) electrical contact materials mainly included three different types. Arc erosion morphologies of Ag/ZnO(10) and Ag/SnO2(10) electrical contact materials were mainly liquid splash and evaporation, and those of Ag/CuO(10) and Ag/CdO(10) were mainly material transfer from anode to cathode. Arc erosion morphology of Ag/SnO2(6)In2O3(4) electrical contact materials included both liquid splash, evaporation and material transfer. In addition, the formation process and mechanism on arc erosion morphology of Ag/MeO(10) electrical contact materials were discussed. © 2016 The Nonferrous Metals Society of China.


Liu L.,Fuda Alloy Materials Co. | Yan X.,Fuda Alloy Materials Co. | Weng W.,Fuda Alloy Materials Co. | Xie J.,Fuda Alloy Materials Co. | Zheng N.,Fuda Alloy Materials Co.
IET Conference Publications | Year: 2012

The High-pressure water atomization and AgSn alloy powder oxidization were studied. The forming reason of the AgSn alloy powder pre-oxidation's shortcoming was found, and the improvement measure were proposed. Based on the improvements, the dense oxide film on the powder surface after AgSn powder oxidized was resolved, and the AgSnO2 powder sintering strength was increased. Then AgSnO2 fabrication property and stability of electrical performance were increased by.


Bai X.,Fuda Alloy Materials Co. | Li G.,Fuda Alloy Materials Co. | Weng W.,Fuda Alloy Materials Co. | Zhang M.,Fuda Alloy Materials Co. | And 3 more authors.
IET Conference Publications | Year: 2012

Electrical contact is an important part in electrical switches, the contact resistance of electrical contacts will not only affect the electrical switches properties, but also play an important role in energy saving of electrical appliance. Therefore, electrical contact manufacturers and electrical appliance manufacturers pay more and more attention to the electrical contact resistance. Especially in the relays field, contact resistance is considered as one of the important indicators of relay quality. This paper discusses the commercial electrical contacts surface foreign materials, surface roughness, surface flatness, as well as the surface film formation process and their effects on contact resistance, and puts forward the main technical indicators which affect contact resistance and the improving methods.

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