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Wenbin L.,Shaanxi University of Science and Technology | Jianfeng H.,Shaanxi University of Science and Technology | Jie F.,Shaanxi University of Science and Technology | Zhenhai L.,Xianyang Research Design Institute of Ceramics | And 2 more authors.
Tribology International | Year: 2016

Carbon fabric/phenolic composites with the filaments counts of 12,000 were prepared by dip-coating and hot-press techniques. The effects of operating conditions on the tribological properties were investigated. Results show that the dynamic friction coefficient (u) firstly increases and then decreases as the rotating speed and total inertia increase. However, the friction stability and shudder phenomenon become gradually poor. The influence of braking pressure on u is the largest, followed by the total inertia among the above three operating conditions. The adhesive wear and abrasive wear are the main wear mechanisms during 1000 continuous braking cycles. © 2015 Elsevier Ltd. All rights reserved.


Huang F.,Shaanxi University of Science and Technology | Wang S.,Shaanxi University of Science and Technology | Zhang S.,Shaanxi University of Science and Technology | Wang Z.,Shaanxi University of Science and Technology | Liu C.,Xianyang Research Design Institute of Ceramics
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2015

Tourmaline/TiO2 nanotube composites with the average diameter of 18.8 nm and the length of several hundred nanometers were prepared by a modified sol-gel method and a hydrothermal method. The tourmaline/TiO2 nanotube has an anatase crystal structure. Effects of hydrothermal reaction time, calcination temperature and amount of tourmaline on the phase structure, morphology and the as-prepared composites were investigated. The photocatalytic activity of the tourmaline/TiO2 nanotube composites was inspected using methyl orange. The results indicate that after hydrothermal reaction for 2 h, the nanotube composites calcined at 500 ℃ can have one-dimensional structure of TiO2 with anatase crystals and the Ti-O-Si. The addition of a small amount of tourmaline as permanent electrodes can improve the photocatalytic properties of nano-TiO2 effectively. When the amount of tourmaline is 0.5% (in mass fraction), the maximum photocatalytic activity of the tourmaline/TiO2 nanotube composites calcined at 500 ℃ is 98.5%, which is greater than that of the pure TiO2 prepared by modified sol-gel (i.e., 44.9%) and the pure TiO2 deal with hydrothermal (i.e., 33.7%), respectively. ©, 2015, Chinese Ceramic Society. All right reserved.


Huang F.-P.,Shanxi University | Wang S.,Shanxi University | Zhang S.,Shanxi University | Li C.-X.,Shanxi University | And 2 more authors.
Chinese Rare Earths | Year: 2015

Pr-doped TiO2 nannometer materials was successfully synthesized by the hydrothermal method using titanium and Pr(NO3)3 as precursors. The crystal structure and photo absorption properties of the samples were investigated by the techniques of X-ray diffraction (XRD), SEM, Raman spectroscopy and Ultraviolet-visible reflectance spectroscopy (UV-Vis DRS). The results showed that the synthesis conditions had great effects on the morphology and catalytic performance of the materials, and the best one was determined as hydrothermal temperature 150℃ for 12 h, content of Pr0.5% and calcination temperature 600℃. The visible light absorption properties of samples doped with Pr3+ are obviously enhanced, with absorption limits bathochromic shift 50 nm. ©, 5015, Editorial Office of Chinese Rare Earths. All right reserved.


Wenbin L.,Shaanxi University of Science and Technology | Jianfeng H.,Shaanxi University of Science and Technology | Jie F.,Shaanxi University of Science and Technology | Zhenhai L.,Xianyang Research Design Institute of Ceramics | And 2 more authors.
Journal of Materials Science | Year: 2016

In order to improve the interfacial adhesion of carbon fabric/phenolic composites, the glass powders modified by silane coupling agents were introduced by repeated filtration method. Subsequently, the effects of glass powder content (0–3 wt%) on their mechanical and wet tribological properties were investigated based on the characteristics of surface micrographs, three-dimensional surface profiles, skeletal densities, and porosities. Results show that the incorporation of glass powders not only promotes the interfacial adhesion between fiber and matrix but further increases shear and flexural properties. Meanwhile, the introduction of glass powders enhances friction coefficients and improves wear resistance, whereas worsens friction stability. Notably, the carbon fabric composites containing 2 wt% glass powders exhibit the greatest shear strength, flexural modulus and strength, friction coefficient but the smallest wear rate. Optical morphology analysis demonstrates that the abrasion of counterpart stainless slider becomes gradually severe with the increase of glass powder content. © 2016 Springer Science+Business Media New York

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