渣浆泵用钢基表面耐磨复合材料的研究

以ZG45为基体，以多种合金粉末作为合金化原料，通过铸渗工艺制备出较为理想的渣浆泵用铁基表面耐磨材料．铸件合金层厚度均匀，基体组织为树枝状的奥氏体，增强相为二次碳化物(Cr，Fe)7C3和渗碳体型碳化物Fe3W3C，在合金化过程中，主要是铁液向合金层渗透，铬向母材的渗透也有，但量很少，合金层与母材的结合良好，属于冶金结合，其冲击磨损性能和硬度都有很大提高，耐磨性比ZG45提高了6．5倍，硬度从合金层到基体逐渐降低，合金层硬度比ZG45提高了3倍左右。     

Performance of Semi-solid Slurry Produced by Twin-screw Stirring Mixer and Rheo-diecasting Process of AZ91D Alloy

The microstructure of semi-solid slurry of AZ91D alloy, which was produced by twin-screw stirring mixer under the different parameters, was investigated. Rheoforming by cold chamber die casting process was performed thereafter. The results indicate that with decreasing of the barrel temperature of the mixer and the pouring temperature of molten Mg alloy, the solid fraction of semi-solid slurry increases and the size of non-den-dritic grains becomes smaller. While the shear rate increases, the solid fraction of semi-solid slurry decreases. The tensile strength and elongation of metal rheoformed by die casting are higher by about 37% and 44% respectively than those produced by conventional liquid die casting.     

液下搅拌机器人功能初探与动力学分析

针对目前单纯机械搅拌装置体积大、笨重、能耗多的缺点,提出了液下搅拌机器人的一种方案,并对机器人各部分结构功能进行了初步描述,进而对机器人的运动学和动力学特性做了分析.机器人的研制成功将提高水煤浆代油技术生产的现代化水平.     

抗高温降滤失剂PAX的合成及性能

采用氧化还原体系以2-丙烯酰胺基-2-甲基丙磺酸(AMPS),丙烯酰胺(AM),等乙烯基单体为基本原料合成出了新型抗高温二元共聚物PAX系列处理剂.该降滤失剂在220℃的高温下及饱和盐水中具有良好的降滤失作用.     

矿渣固化钻井液技术的高温分散剂研究

由于高温深井泥浆本身具有粘度大、密度高以及成分复杂等特点,导致在MTC浆体中泥浆分散剂分散作用甚微,甚至根本无法配浆.从MTC浆体的增稠原理出发,合成出含非离子型基团的多种改性聚氧乙烯类物质的MTC高温分散剂SSOB.该分散剂加量小、分散能力强,不影响MTC浆体的稠化时间、抗压强度等其他性能,与其他外加剂(激活剂、缓凝剂等)相容性好等优点,使MTC浆体具有优良的综合性能,从而为高温深井油气的开发的MTC技术提供了保证,具有广阔的发展和应用前景     

谈建筑施工企业成本控制

通过列举实际工程中的相关管理经验,分别从标准化工作流程、建立完善的责任成本制度、严格的技术审核和方案优化、健全材料管理制度四个方面详细地阐述了建筑施工企业应如何有效控制成本,以提高施工企业的竞争力。     

Consolidation grouting technology for fire prevention in mined‐out areas of working face with large inclined angle and its application

The phenomenon of linear flow of slurry in mined‐out areas of working face with large inclined angle is a crucial issue that hinders grouting for fire prevention. The traditional way of grouting exerts a poor effect on inhibiting coal spontaneous combustion, so it is in urgent need of a suitable grouting technology for fire prevention in mined‐out areas with large inclined angle working face. This paper brings up the consolidation grouting method for fire prevention for the first time and conducts a systematic study on the flow characteristics of slurry and sedimentation characteristics of slurry in mined‐out areas with large inclined angle working face. Consolidation slurry materials and their ratio are optimized by experiments. Test platform has been established, and effectiveness of the consolidation grouting for fire prevention has been simulated. The results show that settling velocity of yellow mud increases at first and then decreases as the concentration of consolidation slurry materials ascends. The optimum mass concentration is 0.2%–0.8%. The flow speed of mud is greatly reduced by laying consolidation slurry materials (The decreasing range is approaching 50%). The retention of yellow mud in mined‐out areas has significantly increased. Finally, technology in working site has been developed; meanwhile, compressed air and spray between frames have been used during the period of working face, and the consolidated way of expansion bags in wood crib to lay consolidation slurry materials has been adopted during the period of stopping work. Field application shows that CO concentration at upper corner decreases significantly and eliminates signs of spontaneous combustion. Besides, the flowing water becomes clearer, and effectiveness of the consolidation grouting is remarkable after laying consolidation slurry material band. Research results can provide theoretical guidance to technology for fire hazard prevention in mined‐out areas with large inclined angle. Copyright © 2016 John Wiley & Sons, Ltd.     

提高泥水盾构进排浆管软连接使用寿命的研究

对大直径泥水盾构泥水系统在施工方面存在的问题进行了仔细分析,结合软连接爆管漏浆的主要原因,总结了泥水盾构进排浆管软连接使用和改造的技术措施,以提高盾构施工效率。     

Decomposition Characteristics of an Artificial Biogas in a Low‐Pressure DC Glow Discharge

The decomposition characteristics of an artificial biogas, which is a mixture of CH ₄, CO ₂, and H ₂ S, using a low‐pressure DC glow discharge have been investigated. It is found that H ₂, CO, C ₂ H ₂, H ₂ O, CS ₂, and COS are produced from the artificial biogas in the glow discharge. About 65% of the hydrogen atoms in CH ₄ are converted into H ₂ at an input energy of 800 J, at which CH ₄ is completely decomposed, and the decomposition characteristics of the artificial biogas are minimally dependent on the H ₂ S additive. Further, H ₂ S has a tendency to be decomposed earlier than the other components of the artificial biogas. When the glow discharge is generated in the artificial biogas with H ₂ S, some of the carbon atoms are found to deposit on the electrodes and the wall of the discharge chamber. © 2013 Wiley Periodicals, Inc. Electr Eng Jpn, 186(1): 26–33, 2014; Published online in Wiley Online Library ( wileyonlinelibrary.com ). DOI 10.1002/eej.22304