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加气混凝土作为一种以粉煤灰为原料,综合利用工业废渣的新型建材,具有轻质、保温、隔音的特点,是代替实心粘土砖理想的墙体材料,正受到世界各国的重视。介绍了加气混凝土的国内外发展情况,在分析加气混凝土生产线组成及工艺流程基础上,重点探讨了加气混凝土生产的坯体静停硬化、坯体切割、坯体养护等工艺及加工设备、技术,提出了中国加气混凝土产业健康可持续发展的对策。 相似文献
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采用KH570硅烷偶联剂在无水条件下对AlN和BN进行改性处理,并作为导热填料填充至玻璃纤维增强丁苯树脂复合材料中,研究了不同导热填料对复合材料吸水率、导热性能、介电性能和力学性能的影响。结果表明:2种导热填料的填充均会提高复合材料的吸水率,但相比于未改性填料,改性填料的填充对复合材料吸水率的提升幅度很小;随着改性AlN填充量的增加,复合材料的介电常数和介电损耗明显增加,介电性能下降,弯曲强度先增加后降低;随着改性BN填充量的增加,复合材料的介电常数增加,介电损耗降低,弯曲强度增大;2种改性导热填料均能提高复合材料的导热性能,与单组分填充相比,改性AlN和改性BN混杂填充对复合材料导热系数的提升作用更强。 相似文献
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《机械工程与自动化》2017,(4)
以FX3U-48MR型PLC为核心控制器,结合FX2N-2DA模块和步科触摸屏,设计了蒸压加气混凝土砌块半成品吊具的控制系统。介绍了半成品吊具的硬件组成和软件设计,通过对人机界面的人性化设计,为吊具的操作、故障监控提供了可视化的平台,大大提高了半成品吊具的自动化、智能化水平。生产实践证明:该控制系统运行平稳、控制精度高,在蒸压加气混凝土砌块生产过程中得到了很好的应用。 相似文献
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掰板机是对于加气混凝土砌块制造工艺而设计的.该液压系统采用负载敏感回路和安全回路有效地保证了设备的使用寿命,同时延生了其应用范围. 相似文献
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Fly ash, generated during the combustion of coal for energy production, has been regarded as an environmental pollutant if not properly disposed of. Many aggressive efforts have been evaluated to recycle the fly ash. In this paper, a new approach was developed to prepare lubricant additive based on fly ash and the tribological properties were investigated in detail. The results show that fly ash modified with oleic acid not only performs favorable dispersive ability, but also significantly improves the friction-reducing and anti-wear abilities for steel/steel contact. Based on the characterization of the wear scars by scanning electron microscopy, Raman spectroscopy and energy-dispersive X-ray spectroscopy, the excellent tribological properties are attributed to the synergies of fly ash and oleic acid because fly ash can act as spacer and bearing and deposit on the worn surfaces to significantly improve the friction-reducing and anti-wear abilities, and the introduction of strong polar groups can make fly ash easily form a stable and successive tribofilm on the rubbing surfaces throughout the sliding process. 相似文献
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Development of fly ash-based automotive brake lining 总被引:8,自引:0,他引:8
Coal-fired power plants all over the world generate huge amounts of fly ash each year, 70 million tons of which are produced in the United States alone. Only 40% of all fly ashes generated in the USA find beneficial applications and rest have to be disposed off, which is burden for the generation industry. Fly ash particles possess certain characteristics that make them suitable for use in friction composites as a filler material. An attempt has been made through this research to incorporate more than 50 wt% of fly ash particles in automotive brake lining friction composites. This paper presents the research carried out on development of friction composites, using fly ash obtained from a specific power plant in Illinois. Ingredients such as phenolic resin, aramid pulp, glass fiber, potassium titanate, graphite, aluminum fiber and copper powder were used in the composite development phase, in addition to the fly ash. The developed brake lining composites have exhibited consistent coefficients of friction in the range of 0.35–0.4, and wear rates lower than 12 wt%. 相似文献
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为了进一步提高微波波导法对飞灰含碳量检测的准确性,提出了一种利用微波在波导内不同介质分界面的反射作用,通过时域变换找到微波到达不同介质分界面的时间,再结合微波在波导内不同介质中的传输速度,计算得到波导内飞灰的灰位及相对群折射率的方法。本文使用规格为7.9 mm×15.8 mm×100 mm的矩形波导,在12.4~18 GHz频段下利用上述方法对质量为0~12 g,含碳量为1%~10%的一系列灰样的灰位与相对群折射率进行测试。结果表明在测量过程中,存在一个临界点,即当波导内实际灰位大于47.3 mm时,测得的灰位与实际灰位误差基本在±2 mm以内,且波导内灰样的相对群折射率与飞灰含碳量呈正相关,而不随飞灰质量的变化而变化。 相似文献
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通过对海水预处理的试验和分析总结,我们认为采用混凝沉淀一体化设备去除水中的悬浮物和浊度是完全可行的。 相似文献
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Jae Keun Lee Ok Chun Hyun Jung Eun Lee Sang Deok Park 《Journal of Mechanical Science and Technology》2001,15(5):630-638
The electrical resistivity of sinter dusts generated from the steel industry and coal fly ash from the coal power plant has been investigated using the high voltage conductivity cell based on JIS B 9915 as a function of temperature and water content. Dust characterization such as the chemical composition, size distribution, atomic concentration, and surface structure has been conducted. Major constituents of sinter dusts were Fe2O3 (40–74.5%), CaO (6.4–8.2%), SiO2 (4.1–6.0%), and unburned carbon (7.0–14.7%), while the coal fly ash consisted of mainly SiO2 (51.4%), AI2O3 (24.1%), and Fe2O3 (10.5%). Size distributions of the sinter dusts were bi-modal in shape and the mass median diameters (MMD) were in the range of 24.7–137μm, whereas the coal fly ash also displayed bi-modal distribution and the MMD of the coal fly ash was 35.71 μm. Factors affecting resistivity of dusts were chemical composition, moisture content, particle size, gas temperature, and surface structure of dust. The resistivity of sinter dusts was so high as 1015 ohm cm at 150 °C that sinter dust would not precipitate well. The resistivity of the coal fly ash was measured 1012 ohm cm at about 150 °C. Increased water contents of the ambient air lowered the dust resistivity because current conduction was more activated for absorption of water vapor on the surface layer of the dust. 相似文献
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本文介绍了一种“皮带秤物料速度检测和分段整体去皮方法”的发明专利.该发明的测速原理不同于现有技术,测速的对象是物料位移或物料速度,同皮带秤工作原理的数学表达式直接相符,走出了把皮带行程当做物料位移或把皮带速率当做物料速度的误区;本发明的去皮算法也与现有技术显著不同,不是扣除皮带线密度与通过的长度乘积,而是对于越过称量段的每一分段空皮带的整体重量一次性扣除,因而消除了因皮带长度变化以致去皮不准的后果. 相似文献