自蔓延高温合成氧化铝陶瓷内衬J55钢油管的性能

采用离心自蔓延高温合成法在J55钢油管内表面制备了氧化铝陶瓷层,得到陶瓷内衬复合油管,研究了该复合油管的显微组织、耐腐蚀性能、抗结垢结蜡性能、力学性能和内衬层的结合性能,并与J55钢油管进行了对比分析。结果表明:该复合油管基体的显微组织与J55钢油管相似,但晶粒得到了细化;复合油管的抗拉强度和承压性能与J55钢油管的基本相近;复合油管内表面的耐腐蚀性能和抗结垢结蜡性能优异,腐蚀后内表面形貌未发生明显变化,腐蚀质量损失率约为0.09%,远小于J55钢油管的51.11%,结垢结蜡试验后管内沉积物较少,质量增加率仅为0.45%,远小于J55钢油管的31.5%;复合油管的最大冲击功为73.5J,最小弯曲半径为11.47m,其陶瓷层和基体结合强度为36.68MPa。     

应变时效对大口径X80管线钢拉伸性能的影响

将大口径X80管线钢试样拉伸至应变为0.5%~3.5%,卸载后分别进行室温及200,230,250℃时效处理,研究了拉伸预应变和时效温度对试验钢拉伸性能的影响;采用直缝埋弧焊在制管扩径率为0.5%~0.8%下对试验钢进行制管,研究了制管扩径率对试验钢拉伸性能的影响。结果表明:进行一定应变预拉伸+时效处理或制管扩径后,试验钢发生应变时效,其屈服强度增大,抗拉强度变化较小,屈强比增大;制管扩径率对屈服强度增量和屈强比增量的影响比拉伸预应变的更大;室温应变时效后,拉伸预应变是影响屈服强度和屈强比提高的主要因素;200~250℃应变时效对试验钢拉伸性能的影响比室温应变时效的大,200~250℃时效温度的变化对拉伸性能影响不大。     

油管涂层的摩擦学性能实验研究

为了治理有杆泵井的管杆偏磨问题,在油管上喷涂了一层耐磨防腐涂层,并对比研究了抽油杆和油田常用的油管摩擦副及喷涂耐磨涂层后的油管摩擦副的摩擦磨损性能。结果表明:与45#钢对磨时,N80的耐磨性要比J55好;当45#钢与J55涂层油管对磨时,J55涂层油管的耐磨性比J55油管提高了5倍,并且配对的45#钢的磨损量也降低了1/2;因此45#钢与J55油管涂层配合使用时防偏磨效果十分理想。     

SEW汽车传动轴焊管开发研究

SEW是一种"高频焊管+热张力减径+全管体热处理"的新型制管工艺。其具有全管体性能均一和尺寸精度高的优点。对SEW管和传统汽车传动轴焊管的常规性能进行试验比较,结果表明,SEW管的大多数性能都优于传统汽车传动轴焊管。SEW技术可以应用到汽车传动轴行业,并可将SEW技术推广到更多的制管行业中去。     

合金元素铬和铝对J55钢电化学腐蚀行为的影响

为了解铬、铝合金元素对J55钢电化学腐蚀行为的影响,采用电化学测试和浸泡试验研究了含铬和铝的J55钢在3.5%NaCl溶液中的电化学腐蚀行为。结果表明:加入1.49%Cr、1.47%Al和1.98%Cr、1.95%Al后,J55钢的开路电位(或自腐蚀电位)明显正移,腐蚀活性降低,极化电阻增大,自腐蚀电流密度减小,腐蚀速率大大降低;加入铝、铬元素后的J55钢在NaCl溶液中浸泡200d后,其表面生成了富集铝和铬的具有保护性的腐蚀产物膜,提高了钢的耐腐蚀性能。     

瓜儿豆胶接枝AMPS在CO_2环境中对J55钢的缓蚀作用

通过使用瓜儿豆胶和2-丙烯酰氨基-2-甲基丙磺酸为原料合成了瓜儿豆胶接枝AMPS(GGAMPS),并通过傅里叶红外光谱、失重法、电化学方法和扫描电子显微镜等方法考察其在3.5%NaCl的饱和CO_2溶液中对J55钢片的缓蚀作用及其表面形貌,并通过等温吸附模型研究了GG-AMPS在J55钢表面的吸附类型。结果表明,GG-AMPS对J55钢在含3.5%NaCl的饱和CO_2溶液中具有一定的缓蚀作用,能够有效抑制J55钢的腐蚀;其缓蚀效率随着缓蚀剂含量的增大而提高,且浓度一定时,温度升高,缓蚀效率逐渐下降;当加入800mg/L缓蚀剂时,缓蚀效率分别根据电化学阻抗谱和极化曲线计算所得达到了80.40%和89.23%;通过扫描电子显微镜(SEM)也表明,GG-AMPS的缓蚀效果良好;该缓蚀剂在J55钢表面的吸附是自发过程,主要为物理吸附。     

J55膨胀套管特殊螺纹接头性能分析

膨胀套管螺纹接头联接的性能关系到膨胀套管应用过程中的可靠性。以J55钢级膨胀套管为研究对象,采用有限元法,分析了J55钢级膨胀套管采用一种负角特殊螺纹结构的接头,在几种加载情况下的力学性能和套管膨胀后机械性能发生的显著变化。     

青岛海工基地制管车间的优化设计与应用

针对青岛海工基地制管车间的产能要求,全面考察了制管车间平面布局与生产工艺流程,从总体规划到详细设计各个阶段所面临的关键技术问题及要素,最终确定了优化设计方案,为青岛海工基地制管车间的顺利开工运行提供了技术保障。     

立式径向挤压制管机研究现状与发展

介绍了国内外立式径向挤压制管工艺技术和设备状况,通过将径向挤压加工工艺与传统的制管工艺进行对比,分析了立式径向挤压工艺的优缺点,并展望了立式径向挤压制管机的发展趋势。     

混沌状态下非线性隔振装置的隔振性能评估

针对混沌状态下非线性隔振装置的特殊隔振性能，从非线性系统的隔振原理及混沌隔振原理出发，提出在激励频率为优势频率的简谐激励下，使隔振装置处于特定的混沌状态，通过振级落差公式评估隔振装置的整体隔振性能，通过优势频率处的能量衰减评估隔振装置对特定优势频率的局部隔离效果，从而对混沌状态下的非线性隔振装置的隔振性能进行综合评估。并通过实例对该方法进行了验证。     

酪蛋白磷酸肽的酶水解条件研究

本研究主要是以粗制的干酪素为原料,采用单因素分析和四因素三水平L9(34)正交试验.确定用碱性蛋白酶从水解的原料-劣质干酪素中提取酪蛋白的最佳条件是温度55℃、pH9.0、时间2.5 h、原料浓度为15%.     

纯电动汽车动力系统全生命周期节能减排绩效评价研究

采用全生命周期评价(LCA)方法,基于GaBi平台建立了某燃油车车型改进而来的纯电动汽车的动力系统的全生命周期环境影响评价模型,将动力系统分为动力电池、驱动电机、控制装置和减速器4个关键部件进行清单分析,分别从原材料获取、生产制造、运行使用和报废回收等生命周期4个阶段进行节能减排绩效评价计算。评价结果表明,在全生命周期的4个阶段内,原材料获取阶段的矿产和化石能源消耗最多、使用阶段的环境影响值最大,其中以全球变暖潜值(GWP)影响最为显著; 报废回收阶段则在矿产资源的消耗、化石能源的消耗以及环境排放方面均产生了一定正效益。基于分析结果,提出了当前应采用优化电网结构、加大动力系统零部件回收等措施来降低纯电动汽车对生态环境的影响。     

Effect of induction heating on fatigue life of drive plate for dual mass flywheel

A dual mass flywheel has positive effects on noise and vibration problems, but there are still difficulties securing sufficient component durability during the development process to increase the output. In this study, the fatigue life of a drive plate, a component in the power transmission path that is often fractured by cyclic loading, is evaluated in relation to heat treatment, and the effect of heat treatment on the fatigue life is studied. For this purpose, a fatigue test and rig test are conducted on both the raw material and heat-treated material of the drive plate. Based on the fatigue material properties obtained from the fatigue tests and the boundary conditions of the rig test, a fatigue analysis is conducted to predict the fatigue life. The heat-treated material has a fatigue life five times longer than the raw material in both the rig test and fatigue analysis. The fatigue life evaluation method is validated through a comparison of the life predicted by the fatigue analysis and the test results of the rig test.     

Effects of Zinc Borate and Fly Ash on the Mechanical and Tribological Characteristics of Brake Friction Materials

Friction materials based on several combinations of zinc borate (ZB) and fly ash (FA) were fabricated and characterized for their mechanical and tribological performance. The triboperformance of the friction materials was evaluated on a Chase friction testing machine according to the brake lining quality test procedure as per SAE J661. The composites were manufactured based on a nonasbestos organic-based friction material for an automotive brake system and contained typical ingredients for commercial brake friction materials. The composites had a fixed composition of 15 wt% resin, 15 wt% fibers, and 5 wt% friction additives. ZB and FA as fillers were added to the the raw materials mixture at a total fraction of 65 wt%. The results showed that ZB and FA contents have a significant influence on the mechanical and tribological properties of the friction composites. In particular, the composites containing 0–5 wt% ZB and 65–60 wt% FA showed better friction stability and improved fade resistance compared to those containing 10–35 wt% ZB and 55–30 wt% FA, whereas the composite with 5 wt% ZB and 60 wt% FA showed a maximum friction coefficient. On the other hand, the specific wear rate of the composites decreased with increasing ZB and decreasing FA contents. The morphologies of the worn surfaces as well as wear debris were analyzed by means of scanning electron microscopy.     

生料球粒度在线检测方法研究

水泥窑生料球粒度大小对水泥质量具有直接影响,目前尚无生料球粒度在线检测手段。本文基于计算机图象识别技术,提出一种在线测定生料球粒度的新方法,解决了料球图象识别的关键问题——料球的边缘检测。并以此组成生料球粒度在线检测系统,其输出可作为现有生料球预加水控制系统的反馈信号,以便实现闭环控制。对比实验表明,系统给出的粒度分布及平均粒度与实际粒度分布及平均粒度基本吻合。     

搪塑PVC表皮气味优化方案

通过对搪塑PVC仪表板的主观气味评价与客观分析溯源,得出影响搪塑PVC仪表板的主要影响物质为游离醇等小分子物质,并从原材料配方优化、原材料工艺优化、搪塑PVC表皮后处理优化方式来验证优化方案的有效性。结果表明:搪塑PVC粉热混温度提高5℃,可有效提高成品气味性;同步增加烘烤工艺,常用的烘烤工艺为80℃、4 h,总成气味可达6级及以上。     

有杆泵井管杆偏磨规律实验研究

利用自行设计制造的管杆磨蚀试验机,对N80油管和F45钒接箍材料进行了磨蚀实验,获得了油井产出液中油水比和含砂量对管杆偏磨的影响规律;并对J55和N80油管进行了腐蚀实验,获得了油田产出液pH值、矿化度对管杆磨蚀率的影响关系规律。实验结果表明:油井产出液油水比在5%~20%之间时,油水比越大,管杆的磨蚀率越小;含砂量在0.3‰~1.5‰之间时,管杆材料的磨蚀率随着油井产出液含砂量的增加而增大;管杆材料的腐蚀率都随着油井产出液矿化度的增大而增大。     

某企业零库存管理的应用与实现

为了降低企业的原材料库存占有率,提高资金利用率,提出了一种基于原材料供应商寄存方式的零库存管理方法。该管理方法的流程是利用ERP管理系统,在采购环节获取原材料需求信息的基础上,生成原材料到货单,而后将该信息流转给仓库管理系统,实现原材料的虚拟出入库过程,而实际原材料则根据出库信息直接由供应商进入生产线,减少了原材料库存。实际应用表明,该方法可以有效地降低企业原材料库存积压,提高企业的综合管理效率。     

Histochemical analysis of the root tuber of Polygonum multiflorum Thunb. (Fam. Polygonaceae)

Authentication is the first priority in quality evaluation of Chinese herbal medicines (CHMs). The most commonly used authentication methods are morphological identification and microscopic identification. Unfortunately, these two methods cannot provide the chemical information needed to assess the quality of CHMs. In this study, a combination of fluorescence microscopy and high performance liquid chromatography-mass spectrometry (HPLC-MS) was used to analyze the chemical profiles of the tissues of the raw root tubers of Polygonum multiflorum Thunb. The results showed that the cork cells, cortex, and vessels in transverse sections of the raw root tuber of P. multiflorum fluoresced differently. Further analysis by HPLC-MS revealed that anthraquinones are mainly distributed in the cortex, and 2,3,5,4'-tetrahydroxystilbene-2-O-β-D-glucopyranoside could be found in all tissues of the raw root tubers of P. multiflorum with its relative content as cork > cortex > xylem of allotype vascular bundles > xylem of central vascular bundles. Moreover, the fluorescence characteristics of the tissues from the steamed root tuber of P. multiflorum were compared and showed different fluorescence from those of raw material. From these results, it can be deduced that the root tuber of P. multiflorum with a broader cortex and fewer vascular bundles visible in a transverse section should be of better quality. The different fluorescence characteristics can be used to differentiate raw root tubers of P. multiflorum from those that have been steamed.