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The 1050 aluminum alloy strip was prepared by means of electromagnetic and ultrasonic cast rolling on the modified asymmetric twin roll caster, and then the aluminum substrate for presensitized plate was prepared through cold rolling and annealing.The effects of electromagnetic and ultrasonic cast rolling on microstructure, mechanical properties, surface roughness and electrolytic corrosion properties of 1050 aluminum substrate were studied. The results show that electromagnetic and ultrasonic cast rolling can decrease the average crystallite size of aluminum substrate by 5 μm, increase the crystal boundaries with uniform distribution, and make the second-phase particles with smaller size distributed dispersively in the substrate, meanwhile, it can increase the tensile strength, elongation and micro-hardness by 4.58%, 9.85% and HV 2, respectively, reduce the surface roughness, make the surface appearance more even, electrolytic corrosion polarization curve of aluminum substrate more smooth and the surface corrosion pits with regular shape more dispersive. 相似文献
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在d400 mm×500 mm水平式双辊铸轧机上,研究了采用多能场非对称铸轧方法制备1050铝合金板带的最合理工艺参数,并对比分析了多能场非对称铸轧对组织和性能的影响。结果表明:在铸轧区长度70 mm、前箱温度670°C、铸轧速度1.3 m/min、励磁电流10 A、中心频率(13±1)Hz、超声功率200 W、超声波频率(20±0.2)kHz的条件下,制备出具有最佳组织和性能的1050多能场非对称铸轧板带,铸轧板带的中心分凝面消失,晶粒尺寸减小约40%,且分布均匀,微观偏析明显减少,析出相均匀分布于晶界处,铸轧板带的抗拉强度、屈服强度、伸长率和显微硬度分别提高了22.6%、23.66%、38.75%和9.90%。 相似文献
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石琛 《上海电机学院学报》2003,6(1):32-34
本文分析了市场营销观念的演变(从传统的生产观念到现代的社会营销观念),比较各种观念的适用情况、优缺点;并阐述了相应市场营销理论内涵的改进(由4P到10P和4C)的理念,有助于对市场营销有一个总体的认识。 相似文献
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采用矿物油、聚α-烯烃、多元醇酯和高压加氢BS光亮油调配半合成发动机油基础油,并测定不同配比下基础油的油膜强度、摩擦系数和粘度指数,通过双隐层BP神经网络对基础油调配进行仿真研究,建立了半合成发动机油基础油调配配方优化模型,经过优化训练后,最终得出综合性能优良的配方组合。按49.9957∶4.3693∶42.4578∶3.1772的配比调配基础油,可以使基础油的油膜强度、摩擦系数和粘度指数分别达到56 kg,0.065和112,经实验后仿真结果与实验结果(56 kg;0.065598;112)极其吻合。 相似文献
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为考察自制纳米WS2颗粒润滑材料在柴油发动机中的节能环保效果,在FC2000柴油发动机台架上进行系列应用分析实验.性能分析结果表明,添加纳米WS2颗粒的润滑材料在发动机不同转速和不同负载下均能在一定程度上降低发动机燃油消耗率,减少发动机尾气中的NOx含量和颗粒物含量,并且当发动机转速为1700 r/ain、负载为70 ... 相似文献
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Through using mineral oil and synthetic oil to deploy the semisynthesis base oil, modifying the surfaces of ultrafine tungsten disulfide grains by surface chemical embellishment and adsorption embellishment to make them suspended steadily in the base oil as solid lubricating additive, and adding some function additives, the tungsten disulfide motor oil was prepared. The tribological characteristics of this kind motor oil and the well-known motor oils in our country and overseas were studied. The results show that the oil film strength of this kind of motor oil is respectively 1.06 and 1.38 times of that of shell helix ultra motor oil and great wall motor oil, and its sintering load is 1.75 and 2.33 times of that of them, and when tested under 392 N, 1 450 r/min and 30 min, the friction coefficients of friction pairs lubricated by the tungsten disulfide motor oil decrease with the increase of time, meanwhile, the diameter of worn spot is small, and the surface of worn spot is smooth, and no obvious furrows appear. The experiments indicate that the tungsten disulfide motor oil has the better antiwear, antifriction and extreme pressure properties than the well-known motor oils. 相似文献
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