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Ye X.,Wuhan University of Technology | Zeng L.,Wuhan University of Technology | Liu T.,Wuhan Tigers Technology Development Co.
Composite Interfaces | Year: 2012

The thermal stability of bismaleimide and epoxy modified novolac-type phenolic resin is investigated. Fourier transform infrared spectroscopy results confirm that the phenolic resin is interacted with bismaleimide and epoxy groups. The thermo gravimetric analysis results indicate that the modified resin exhibits better thermal stability than the virgin novolac resin. It is also found that the thermal degradation process can be divided into two stages. The nonisothermal degradation behavior of the modified novolac resin is then studied by multi-stage model-fitting kinetic method and Kissinger-Akahira-Sunose (KAS) model-free method. The two-stage model uses two separated peaks to simulate the DTG curve and the final model predicts the mass loss fraction accurately. It is able to describe the two-stage degradation reaction process and produce two equations corresponding to the two-stage degradation mechanism. The KAS model results in the dependence of activation energy of degradation on mass loss. The activation energy history of degradation also indicates the change of reaction mechanisms. © 2013 Taylor & Francis. Source


Xiaochuan Y.,Wuhan University of Technology | Liming Z.,Wuhan Tigers Technology Development Co. | Lei C.,Wuhan University of Technology | Chao Z.,Wuhan University of Technology
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2010

The diamond abrasives were firstly preprocessed by sodium hydroxide solution. After surface modification with silane coupling agent, they were used to make different resin bonded wheels, and the grinding performances of which wen: then investigated. Experimental results indicated thai, the Ireatment process could improve the bonding state of diamind and resin, enhance the retention ol resin to diamond grits. The grinding ratio of the wheels was thus increased, especially in case of polyimide resin bond wheels, (he grinding ratio of which was increased by 109.9 %. Source


Chen L.,Wuhan University of Technology | Zeng L.,Wuhan University of Technology | Ye X.,Wuhan Tigers Technology Development Co. | Zhang C.,Wuhan University of Technology | Song Y.,Wuhan Jianghan Manufacture of Ultra IT abrasives Co.
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2010

The diamond grains were preprocessed with sodium hydroxide solution, and then surface-modified wilh silane coupling agent. Such treated diamonds were used to make resin bond wheels. The grinding ralio and grinding efficiency of the above resin bond wheels were investigated. Experimental results indicated that the treated diamond abrasives enhanced the grinding ratio of wheels remarkably under dry cutting condition. The observation of the ground wheel surface with microscope demonstrated that the bonding strength between resin and diamond powders was enhanced and less abrasives were shed. Compared with the ease of diamonds treated only with coupling agent, the proposed solution could increase the grinding ratio of diamond wheels by 50%. Source


Cai Y.,Wuhan University of Technology | Zeng L.,Wuhan University of Technology | Ye X.,Wuhan University of Technology | Ye X.,Wuhan Tigers Technology Development Co. | And 2 more authors.
Jingangshi yu Moliao Moju Gongcheng/Diamond and Abrasives Engineering | Year: 2011

Nanodiamond own the properties of nanoparticles and super-hard materials. It is a kind of new materials with a significant application prospect. However, because of the aggregation and the bad dispersion stahilit) of nanodiamond it h not used widely. This paper will review on both the dispersion principle and the preparation methods of nanodiamond suspension, and introduce technique progresses of the preparation of nanodiamond suspension. © 1994-2011 China Academic Journal Electronic Publishing House. Source

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