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Wear Process Analysis of the Polytetrafluoroethylene/Kevlar Twill Fabric Based on the Components’ Distribution Characteristics

Gu D., Fan B., Li F., Yang Y., Chen S.

Autex Research Journal

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2017

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Vol. 17, no. 4

295--302

EN

Polytetrafluoroethylene (PTFE)/Kevlar fabric or fabric composites with excellent tribological properties have been considered as important materials used in bearings and bushing, for years. The components’ (PTFE, Kevlar, and the gap between PTFE and Kevlar) distribution of the PTFE/Kevlar fabric is uneven due to the textile structure controlling the wear process and behavior. The components’ area ratio on the worn surface varying with the wear depth was analyzed not only by the wear experiment, but also by the theoretical calculations with our previous wear geometry model. The wear process and behavior of the PTFE/Kevlar twill fabric were investigated under dry sliding conditions against AISI 1045 steel by using a ring-on-plate tribometer. The morphologies of the worn surface were observed by the confocal laser scanning microscopy (CLSM). The wear process of the PTFE/Kevlar twill fabric was divided into five layers according to the distribution characteristics of Kevlar. It showed that the friction coefficients and wear rates changed with the wear depth, the order of the antiwear performance of the previous three layers was Layer III>Layer II>Layer I due to the area ratio variation of PTFE and Kevlar with the wear depth.

2

Direct synthesis of dimethyl carbonate and propylene glycol using potassium bicarbonate as catalyst in supercritical CO2

Wen Y., Zhang R., Cang Y., Zhang J., Liu L., Guo X., Fan B.

Polish Journal of Chemical Technology

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2015

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Vol. 17, nr 1

62--65

EN

The improved one-pot synthesis of dimethyl carbonate and propylene glycol from propylene oxide, supercritical carbon dioxide, and methanol with potassium bicarbonate as the catalyst has been reported in this paper. As far as we know, it is the first time to use potassium bicarbonate only as the catalyst in the production process which is simple and cheap. Satisfactory conversion rate of propylene oxide and yield of the products could be achieved at the optimized conditions with quite a small amount of by-products. Our new method offers an attractive choice for the production of dimethyl carbonate in large-scale industry efficiently and environmental friendly.

3

Modeling on Char Combustion Characteristics in Fly-ash and Its Countermeasure Improved for Circulating Fluidized Bed Boilers

Fan B., Liu X., Qiao X., Jin Y.

Przegląd Elektrotechniczny

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2013

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R. 89, nr 3b

1--3

EN

A mathematical model of single char particle combustion in circulating fluidized bed (CFB) boiler is developed in this paper. Its numerical solution in operating conditions of CFB boiler verifies the nature of a phenomenon that the distribution of carbon content of char particles in fly-ash has a peak value versus their diameters. When the temperature of the fine char particle is close to the bed temperature, there also exists a peak value for its burn-out time. The fly-ash recirculation and the hot cyclone are presented to improve combustion of char particles.

PL

W artykule przedstawiono model matematyczny zapłonu zwęglonych cząstek (sadzy) w kotle z cyrkulacją warstwową fluidalną (ang. Circulating Fluidized Bed – CFB). Wyjaśniono w ten sposób charakterystykę rozkładu zawartego w cząstce węgla oraz wpływu temperatury cząstki na szybkość wypalania. Dla poprawy sprawności procesu, zaproponowano zastosowanie recyrkulacji lotnych popiołów oraz wiru gorącego powietrza.

4

A Simulation Model for Detecting Vessel Conflicts Within a Seaport

Li Q., Fan B.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2012

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Vol. 6, no. 1

11--17

EN

Conflicts represent near misses between two moving vessels, and often occur in port waters due to limited sea space, high traffic movements, and complicated traffic regulations. Conflicts frequently result in congestion and safety concerns. If conflict risk can be predicted, one could take appropriate measures to re-solve conflicts so as to avoid incidents/accidents and reduce potential delays. To the best of this researcher’s knowledge, no systematic study has been carried out on the issue of detecting marine traffic conflicts. In this paper, we present an algorithm designed to determine a conflict using the criterion of vessel domain. The al-gorithm aims to evaluate the relative positions of vessel domains to detect potential conflicts. To implement the algorithm, a simulation model has been developed in Visual C++. The model at present provides a single function for conflict detection but can be expanded to a multi-functional system for resolving conflicts in fu-ture work.

5

Effects of substrate temperature on crystallite orientation of HfO2 thin films

Wang L., Fan B., Wang Z., Cheng X., Wu Y., Chen L.

Materials Science Poland

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2009

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Vol. 27, No. 2

547--550

EN

Hafnium dioxide thin films were deposited on fused silica substrates by reactive electron beam evaporation at three different substrate temperatures. After deposition, hafnium dioxide thin films were annealed in the ambient atmosphere for two hours at 500 °C and 1000 °C, respectively. X-ray diffractometry was used to study physical characterizations of as-deposited and annealed hafnium dioxide. The experimental results showed that hafnium dioxide fabricated at various substrate temperatures had different crystallite orientations after annealing at 500 °C or 1000 °C. These facts suggest that substrate temperature influences not only the crystallization state of as-deposited hafnium dioxide but also crystallite re-orientation after annealing.