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Wang Q.,Huazhong University of Science and Technology | Liu J.,Huazhong University of Science and Technology | Yang X.,Huazhong University of Science and Technology | Zhao L.,Huazhong University of Science and Technology | And 4 more authors.
Proceedings of the 5th International Conference on Reliability of Electrical Products and Electrical Contacts, ICREPEC 2014 | Year: 2014

To study the anti-welding ability of Nano-AgSnO2 contacts, electrical endurance tests are conducted with nanocrystal AgSnO2 (Nano-AgSnO2) contacts in air and in vacuum under the condition of 28V/10A. The experimental results show the anti-welding ability of Nano-AgSnO2 contacts in air is better than that in vacuum. In order to clarify the causes leading to this phenomenon, analyses of changes of the surface composition as well as surface appearance have been performed with Field Emission Scanning Electron Microscopy (FESEM). The results indicate that element O decreases largely over the welding area of the contact in vacuum, compared with that of the contact surface in air. As a result, AgSn comes into being on the surface of the contacts, whose anti-welding ability is worse than AgSnO2. This may be the main reason leading to that the anti-welding ability of Nano-AgSnO2 contacts in vacuum is worse than that in air. Source


Zeng S.H.,Guilin University of Technology | Wei C.,Guilin University of Technology | Zeng M.,Guilin University of Technology | Zeng M.,Guilin Electrical Equipment Scientific Research Institute Co | And 5 more authors.
Applied Mechanics and Materials | Year: 2014

The friction-resistant sisal fiber/nano-SiO2 phenol formaldehyde resin composites were prepared through compression molding. In order to enhance the bonding between the sisal fiber (SF) and polymer matrix, sisal fibers were treated with different surface modifiers (alkali, coupling agent and borax). The friction and wear properties of the composite materials were investigated with a constant speed (D-SM) tester. The worn surfaces of composites were observed by scanning electron microscope (SEM). The results showed that the adoption of nano-SiO2 phenol formaldehyde resin as matrix resin can solve the heat fade of the friction material. The friction and wear parameters of the treated sisal fiber composites can meet the requirement of standards GB5763-1998. The fiber treatment methods had great influence on the friction and wear properties of the fiber composites. Specifically, the borax treated fiber composites showed low wear rates at different temperatures. The highest friction and wear resistances of sisal fiber composites were reached when the fiber content was 15%. Our data demonstrated that the sisal fiber is an ideal substitute of asbestos for brake pads. © (2014) Trans Tech Publications, Switzerland. Source


Wei C.,Guilin University of Technology | Zeng M.,Guilin University of Technology | Zeng M.,Guilin Electrical Equipment Scientific Research Institute Co | Xiong X.,Guilin University of Technology | And 4 more authors.
Polymer Composites | Year: 2015

The friction-resistant sisal fiber/nano-silica phenol formaldehyde resin composites were prepared through compression molding. To enhance the bonding between the sisal fiber (SF) and polymer matrix, SF were treated with different surface modifiers. The worn surfaces of composites were observed by scanning electron microscope (SEM). The result shows that the matrix of nano-silica phenol formaldehyde resin can relieve the heat fade of the friction materials. Meanwhile sisal fibers treated with borax have effectively improved the friction and wear properties of the composites when the fiber content was 15%. © 2014 Society of Plastics Engineers. Source


Wang Z.,Guilin Electrical Equipment Scientific Research Institute Co | Huang X.,Guilin Electrical Equipment Scientific Research Institute Co | Zhang T.,Guilin Electrical Equipment Scientific Research Institute Co | Meng J.,Guilin Electrical Equipment Scientific Research Institute Co | And 2 more authors.
Proceedings of the 5th International Conference on Reliability of Electrical Products and Electrical Contacts, ICREPEC 2014 | Year: 2014

A comparative study of electrical, mechanical, and microstructure properties of silver-nickel contact materials (85 volume percent Ag) mixed by two different additives, namely tungsten (W) and tungsten oxide (WO3), were analyzed. Even with the same additive content, additive article size and distribution, the two different additives of silvernickel contact materials have resulted in no difference in microstructure, electrical conductivities, tensile strength and elongation, minor differences in hardness and electrical contact resistance, and significant differences in material transfer and arc erosion properties. The addition of tungsten to silver-nickel 85/15 reduced the appearance possibility of maximum weld strength. Material loss due to arc erosion was less for 1.5% tungsten addition than for the 1.5% tungsten oxide addition. This seemed to be a result of the greater arc intensity with tungsten oxide addition. The formation of large nickel particles were microstructure changes observed near the tungsten oxide additive of contact surfaces as a result of the arcing. The additives may influence the extent to which these transformations had occurred. Source


Zhang Q.,Guilin University of Electronic Technology | Ye F.,Guilin Electrical Equipment Scientific Research Institute Co | Huang X.,Guilin Electrical Equipment Scientific Research Institute Co | Liu X.,Guilin University of Electronic Technology | And 3 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2015

AgSnO2 powders prepared by atomization were treated by high energy ball milling. The effects of high energy ball milling on the morphology and sintering property of AgSnO2 powder were investigated. The results show that high energy ball milling can increase sintering properties of AgSnO2 powder, and improve the microstructure of the sintering billet and distribution of second phase particles SnO2 in Ag matrix. As a result, AgSnO2 electric contact materials are obtained with fine grains, high density, high bending strength and excellent processing performance. ©, 2015, Rare Metals Materials and Engineering Press. All right reserved. Source

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