粉煤灰混凝土的抗碳化性能

通过对抗压强度、孔隙率和碳化值的测定,研究了混凝土的抗碳化性能随粉煤灰掺量的变化情况.结果表明,粉煤灰的掺加可以提高混凝土密实度、改善孔结构,混凝土抗压强度和抗碳化性能随着粉煤灰掺量的上升而下降,且抗压强度与碳化值之间存在一定的相关性.     

有机膨润土加入量对粉煤灰铸铁涂料性能的影响

试验研究了有机膨润土加入量从0.5%～5%时,对粉煤灰铸铁涂料的悬浮性、粘结性、高温抗裂性等主要性能的影响规律.从理论和实践进行探讨,结果发现:随着粉煤灰铸造涂料中有机膨润土加入量的增加,涂料的悬浮性提高,粘度增加,但是涂料的高温抗裂性变差.     

聚乙烯醇(PVA)对醇基粉煤灰铸造涂料性能的影响

通过加入一定量的PVA,制备了醇基粉煤灰铸造涂料,研究了PVA加入量对铸造涂料的密度、悬浮性、条件粘度及暴热抗裂纹性等性能的影响。结果表明,PVA加入量从1.0%变化到3.0%时,涂料悬浮性先显著增加,而后增加趋势减缓;涂料的密度逐渐减小,涂料粘度增加,而涂层暴热抗裂纹性逐渐变差。     

Properties of Light MMCs Modified with Cordierite Synthesized from Fly Ash

This paper presents novel opportunities for management of fly ash by synthesizing the material into cordierite ceramics and using it as a reinforcing phase for light metal alloys. Metal matrix composites (based on magnesium alloy and aluminum alloy) were produced by squeeze casting. The magnesium matrix composites with a suitably selected reinforcing phase content (2 wt.%) exhibited much better strength properties than the unmodified alloy (AM60). It was also demonstrated that the wettability (or the lack thereof) in the metal-ceramic system is critical to successful production of the composites based on the AK7 alloy with cordierite. Light alloy matrix composites reinforced with cordierite ceramics particles are innovative materials that combine high strength with low weight, which may be a key factor of merit for numerous applications of the composite in various branches of industries.     

PVB加入量对醇基粉煤灰铸铁涂料性能的影响

实验研究了PVB加入量从0.2%～2.0%时,对醇基粉煤灰铸铁涂料的悬浮性、粘结性、高温抗裂性等主要性能的影响。结果发现:随着粉煤灰铸铁涂料中PVB加入量的增加,涂料的悬浮性提高,条件粘度增加,而涂料的高温抗裂性变差。     

铸造旧砂热法再生粉尘-粉煤灰基地质聚合物材料性能研究

以粉煤灰为主要原料,铸造旧砂热法再生粉尘为添加料,水玻璃型碱性激发液为激发剂,制备地质聚合物.采用XRD和SEM对试样微观表征,研究了质量配合比和液固比对铸造旧砂热法再生粉尘-粉煤灰基地质聚合物材料抗压强度的影响.结果表明:材料的物相主要由晶态和非晶态组成;粉煤灰质量配合比的增加和液固比的适量减小,有利于抗压强度的增大.当粉煤灰∶铸造旧砂热法再生粉尘∶水玻璃型碱性激发液=75∶25∶40时,试样28 d的抗压强度最大,达到28MPa.     

漂珠/AZ91D复合材料微观组织与性能的研究

采用搅拌铸造法,向镁合金熔体中添加漂珠,制备了漂珠/AZ91D复合材料,研究了该复合材料微观组织的均匀性、相组成、力学性能和阻尼性能。结果表明,漂珠在基体中分布均匀,无偏聚现象。在复合材料制备过程中,漂珠与镁合金熔体发生反应并被填充,使得复合材料中有Mg₂Si和MgO相生成。与基体合金相比,复合材料的力学性能和阻尼性能均得到明显提高。复合材料的断裂是以解理断裂为主的脆性断裂,在断裂过程中漂珠壁被撕裂。复合材料的阻尼机制主要是位错阻尼和界面阻尼。     

Effect of Fly Ash Particles on the Compressive Properties of Closed-Cell Aluminum Foams

The closed-cell aluminum foam reinforced by 1.5 and 3.0 wt.% fly ash particles were manufactured by molten body transitional foaming process. The backscattered electron image shows that fly ash particles distribute uniformly in the cell wall. The quasi-static compression tests were conducted. Results show that Al/Fly ash foams have stable compressive property and the sudden stress drop was not observed. The plateau stress increases nearly linearly with relative density. Moreover, the addition of fly ash particles improves the plateau stress. Also, the energy absorption property of Al/Fly ash foams increase with relative density and fly ash content. These can be attributed to the contribution of the compression of cell gas and the membrane stress in the cell wall.     

粉煤灰制备高温合相变蓄热材料的可行性研究

对利用粉煤灰制备高温复合相变材料的可行性进行研究.结果表明,用粉煤灰作为基体材料,能制备出复合相变蓄热材料.通过金相分析、差示扫描量热仪和X射线衍射分析,这种材料不仅具有良好的烧结成型性,还具有良好的蓄热性能,且能降低复合相变蓄热材料的成本.在此基础上对粉煤灰和相变材料的最优配比及性能进行研究,并对粉煤灰的综合利用和复合相变蓄热材料的发展提出多种途径.     

粉煤灰的资源价值和开发利用

传统观念中,利用粉煤灰制砖或生产水泥等方面的综台利用,对其开发利用的初衷,意在消耗因燃煤获取热能后产生的灰渣--粉煤灰,借以减少粉煤灰对自然环境所产生的污染,由此而派生出来了当前广为流行的粉煤灰开发利用方面的初级处理观念和开发利用方面的普及型方式.这种对粉煤灰的开发利用的实质在于;用粉煤灰代替制砖或生产硅酸盐水泥中的粘土,其主要目的是消极性地消耗掉粉煤灰.