This paper makes PF weaving friction material (p0.0) from tung oil, PF weaving friction material (BP) from boric acid, modified PF weaving friction material (SP) of nanopalygorskite by in-situ method, and modified PF weaving friction material (MP) of nanopalygorskite by blending method. The contrast tests of frictional properties are carried out on DMS-1 friction-abrasion tester. Hot recession test is performed on CHASE-M600 testing machine, and surface appearance analysis of friction sample is made on electronic probe. The result shows that after modification, the heat resistance and thermal stability of PF are all improved to different extent. SP friction material has best thermal stability and strongest braking ability under high temperature; while BP takes second place, and P0.0 is the worst. The heat resistance of BP, SP and MP is stronger than P0.0. The critical temperature of hot recession for weaving friction material on the base of nanopalygorskite/tung oil PF raises by 40~50°C. On the aspect of frictional properties, friction coefficients of SP, BP, and MP show quite stable. Among these samples, SP has the most stable friction coefficient, and P0.0 the worst. The wear rate of SP, BP and MP has the same trend with the temperature changes. However, the wear rate of P0.0 is getting intense with temperature rise. Its wear rate is much higher than SP, BP, and MP’s under same temperature.
This paper carries on research for the temperature field distribution of the intelligent van tobacco baking room,first analyzes the temperature field model in the baking room on the basis of the principle of heat transfer, then makes the simulation computation with the analog software to obtain the temperature field distribution,after that,makes use of field baking experiment with the existing laboratory equipments to measure the temperature change curve in key points in baking room during baking process, and further analyzes the distribution trend of temperature field. The experiment result shows that the analog computation of temperature field distribution is in line with real situation,which can provide theoretical basis for the improvement of structure and technology of baking room .
The admixture of graphene oxide (GO) sheets and chloroacetic acid were ultrasonic treated. As a result, epoxy and hydroxyl groups which existed onto GO sheets were transformed into carboxyl groups. Then, the carboxyl-GO sheets were assembled on silicon substrate by taking use of 3-aminopropyltriethoxysilane (APS) as an intermediate coupling agent (marked as APS-GO). Furthermore, La elements were deposited on the APS-GO by means of chemisorption to form multilayer film (APS-GO-La). Chemical compositions, surface morphologies, and microstructures were investigated by using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and water contact angle (WCA). Experimental results suggested that carboxyl-GO sheets distributed homogeneously on Si substrate. Results also indicated that lanthanum elements can react with the-COOH functional groups of GO film and be adsorbed on the APS-GO film surface. The prepared APS-GO-La multilayer film showed low surface free energy, which has potential applications in nano/micro electro-mechanical systems (N/MEMS).
Jaw crushers are commonly-used machines in aggregate production. The aim of the research is to present a model which is able to predict particle size distribution in jaw crushers and to provide a new method for effectively controlling the quality of crushed product. The object of study was a domestic PEF 400×600 jaw crusher. A performance model was developed based on the standard mass balance formulation and chamber dividing results. Some important parameters that influence the particle output of the crushers were taken into account in the model. The variations of the particle size distribution resulting from changes in the eccentric shaft rotational speed and the parallel strip length were investigated.
1:1 MMT/In composite nanopowders were prepared by nanoMMT and nanoIn modified with coupling agent KH550, and the nano-MMT/In lubricating oil dispersion system was prepared by 150N base opl containing 3 mass fraction of nano-MMT/In composite powders, and then took the dispersion effect by laser particle size analyzer ,TEM and IR. The anti-wear and friction-reducing behaviors of that lubricating oil dispersion system were observed on the MMU-10G abrasive-wear tester with 45#steel tribo-pair, the morphology and the element of the worn surfaces were analyzed by SEM and EDX. The results showed that the grain size of the modified nano-MMT/In was smaller than the one without modification, and the modified nano-MMT/In had the good dispersion in the system; compare with the one in base oil system, the average friction coefficient of sample of 45#steel tribo-pair in nano-MMT/In additive lubricating oil system had declined by 27.5%, and the total wear mass loss had declined by 63%; The surface of sample after friction had created the self-repairing film that contain the characteristic element of MMT and In, that phenomenon was caused by the interaction of nano-MMT and nano-In.
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