共查询到11条相似文献,搜索用时 93 毫秒
1.
微弧氧化是一种新兴的表面处理技术,利用微弧氧化技术在铝及铝合金材料表面生成陶瓷层,该膜层耐磨,耐腐蚀,耐高温冲击等性能明显优于传统阳极氧化膜.本文对试件厚度与LY12-CZ铝合金微弧氧化膜层厚度关系进行了研究.研究表明,试件厚度影响微弧氧化后不同膜厚的试件疲劳特性,试件厚度为2 mm时,膜厚10~20 μm微弧氧化对试件疲劳寿命有提高;试件厚度3 mm时,膜厚10~25 μm,微弧氧化使试件疲劳寿命略有降低;预腐蚀疲劳实验表明,微弧氧化试件腐蚀疲劳寿命比普通阳极化试件的腐蚀疲劳寿命高. 相似文献
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近十几年来,高温称重传感器在冶金工业部门的应用越来越普遍。但是,由于高温称重传感器所用的高温应变片和高温胶粘剂等的特殊性,在制作过程中必须经繁杂的处理和测试工序,使产品生产效率降低、成本提高。人们试图改变这种状态,但是由于有关高温应变片在高温下性能的系统资料甚少,给工作带来不少困难。为了增加人们对传感器用高温应变片的了... 相似文献
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To predict the influence of operating temperatures on cyclone performance, an experimental investigation was conducted on
particle separation in a reverse flow, tangential volute-inlet cyclone separator with a diameter of 300 mm and with air heated
up to 973 K. The test powder silica has a mass median diameter of 10 um, while inlet velocity range was 12–36 m/s. Both the
separation efficiency and pressure drop of the cyclone were measured as a function of the inlet velocity and operating temperature.
At the same inlet velocity, both the separation efficiency and pressure drop decrease with increasing temperature. In addition,
optimum inlet velocity, at which the cyclone has its highest separation efficiency, tends to increase with a rise in temperature.
An analysis on our own data and published results has shown that the fractional efficiency of a cyclone is a definite function
of dimensionless numbers such as the Stokes number, the Reynolds number, the Froude number, dimensionless cyclone inlet area,
and dimensionless outlet diameter. A nondimensional experimental correlation of the cyclone performance, including the influence
of temperature, was obtained on the basis of our own previous work. The prediction of the influence of temperature on separation
efficiencies and pressure drops is in fairly good agreement with experimental results.
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Translated from Journal of China University of Petroleum, 2006, 30(3): 97–100, 105 [译自: 中国石油大学学报 (自然科学版)] 相似文献
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流化实验床高温反应器的加热和控制是整个控制系统设计中的重要环节,文中提出了可行的设计方案,并采取措施解决高温和大电流产生的问题。采用智能仪表实现温度自动调节,通过计算机监测调节过程,使控制系统工作靠且参数调整方便。 相似文献
5.
Three different self-lubricating ceramic matrix composites (CMCs) were fabricated by hot-pressed sintering. They are: Al2O3-50CaF2, Al2O3-20Ag20CaF2, and Al2O3-10Ag20CaF2. Tribological tests were performed at temperatures ranging from 20°C to 800°C in air using a pin-on-disk tester. The experimental
results show that the addition of the solid lubricants CaF2 and Ag can evidently reduce the friction coefficients of alumina between 200°C and 650°C but not at room temperature and
the wear rate of disks and pins at elevated temperature. The improvements in the friction and wear properties of CMC were
due to the formation of a well-covered solid lubricating film. However, breakdown of the lubricating films at 800°C resulted
in high friction and wear.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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高温环境下超声电机的机械性能测试 总被引:3,自引:0,他引:3
研制了一种在高温环境下测试超声电机机械性能的装置,该装置包含了温度环境试验箱、转速转矩测量仪以及连接轴,提出了在高温环境下测试超声电机机械性能的方法.通过该装置和试验方法,对超声电机进行了高温环境试验,其环境温度为50~150℃.试验结果表明:随着环境温度升高,超声电机的转速下降;当环境温度<70℃时,超声电机最大力矩随着温度的上升而增加;当环境温度>80℃时,最大转矩随着温度的上升而下降;当环境温度到150℃时,超声电机不工作,超声电机在高温环境下需要降低其性能使用.该试验装置和试验方法同样适用于低温环境. 相似文献
10.
起重机械液压系统高温故障产生的原因复杂多样。弄清其产生的原因,是消除故障的关键。从"人、机、环"三个方面对起重机械液压系统高温故障的原因进行了分析,以便于有针对性地采取故障消除措施。 相似文献