Lubricating properties of polyalkylene glycol and organic phosphate ester mixed aqueous solutions

Till now,water based lubricants,especially aqueous solutions,have not been employed in the elastohydrodynamic lubrication(EHL)due to their poor film forming capability or low wear resistance.In this paper,we proposed a method to develop water based lubricant:employing polyalkylene glycol solution as base stock to improve EHL film forming capability and using organic phosphate ester(DPZ)as anti-wear additive to improve wear resistance property.The lubricating properties of the mixed solutions,including load carrying capability,wear resistance property,friction reduction property,EHL film forming behavior,were investigated.The experimental results indicate that the mixed solution presents excellent lubricating properties,which make it a promising candidate in developing water based lubricants.     

变压器专用密封材料的研制

油浸式变压器密封材料性能优化是解决变压器漏油故障的重要途径。分析了变压器密封材料老化原因,提出了变压器密封材料应具有的性能要求,并以此为目标研发了变压器专用的密封材料软木橡胶。详细叙述了软木橡胶的特性,通过试验表明,软木橡胶是一种性价比高的优良新型变压器专用密封圈材料,用这种新型材料制成的变压器密封圈已获得了国家专利。该材料还可用于其他电气设备。     

电解铝液生产高品质6061铝合金圆铸锭工艺研究与实践

探讨了用电解铝液直接生产高品质6061铝合金圆铸锭工艺技术,主要在熔体处理、炉内精炼、晶粒细化、炉外在线净化、均匀化处理和生产设备等方面采取了相应的技术措施.结果表明,优化后的生产工艺制度能够满足高品质6061铝合金圆铸锭的质量要求,在均匀化过程中适宜的均匀化工艺为560℃×8h.     

基于C++的NXOpen和Journamation二次开发技术的研究和应用

以NX软件为平台,详细阐述了NXOpen开放式架构的特点和NXOpen客户化开发功能,归纳总结了基于C++的NXOpen和Journamation二次开发技术的流程和工作原理。以NX软件建模模块为例进行Journamation开发,实现了客户化功能的快速开发。     

利用西气东输机遇调整地方能源产业结构

天然气是一种优质、高效、清洁的能源和化工原料.二十世纪20年代西方发达国家开始开发利用天然气,至今,天然气已逐步进入鼎盛时期,取代石油的步伐加快.据国际能源组织预测,世界天然气有望以压倒石油和煤炭的优势,成为世界一次能源消费结构中的"首席能源".     

Numerical Study on Bubble Formation of a Gas‐Liquid Flow in a T‐Junction Microchannel

Bubble emergence in a gas‐liquid flow in a T‐junction microchannel of 100 μm diameter, operated under a squeezing regime, was simulated with the computational fluid dynamics method. In general, bubble formation in channels includes three stages: expansion, collapse and pinching off. After analyzing and comparing quantitatively the three forces of pressure, surface tension and shear stress acting on the gas thread in the whole process, their effects in the different stages were identified. The collapse stage was the most important for bubble formation and was investigated in detail. It was found that the collapse process was mostly influenced by the liquid superficial velocity, and the rate and time of collapse can be correlated with empirical equations including the liquid superficial velocity, the capillary number and the Reynolds number.     

向世界第一的技术和质量挑战，立志让21世纪橡胶市场更加丰饶

On December 2, the broad masses of R ＆ D personnels of Shuguang Rubber Industry Research and Design Institute united, cooperated, hard researched and successful developed the second-generation security tires which are passed the testment of various machines, which marked the another breakthrough in the safety tire field from Shuguang institute.     

Dynamic Fracture Toughness of Piezoelectric Ceramics

Both dynamic and static three‐point bending fracture testings of 32 piezoelectric ceramic samples were performed in four different poling directions. A modified split Hopkinson pressure bar method with a polyvinylidene fluoride (PVDF)‐based gauge was utilized for the dynamic experiments. The loading rate greatly influenced the fracture toughness in two ways: the dynamic fracture toughness values were much higher than those of the static fracture toughness, and unlike the static fracture toughness, the influence of poling direction on the dynamic fracture toughness was not obvious.     

Crack branching instability and directional stability in dynamic fracture of a tough bulk metallic glass

We report the ductile fracture behavior of a tough Zr-based bulk metallic glass (BMG) in the dynamic regime, where a rapid moving crack initiates by a Mode II shearing and then advances through plastic voids growth and linking. A clear fractographic evolution from river-like vein pattern to chevron-like zone where microscopic dimples and voids coexist, followed by crack microbranching pattern, was observed on the dynamic fracture surfaces. A terminal crack velocity of about 0.5 of the Rayleigh wave velocity was determined for the onset of such microbranching instability. Furthermore, the dynamic branched daughter cracks are favored to continue in their original mother crack plane, having “directional stability”. Our findings may increase the understanding of the dynamic fracture of BMGs with both glassy nature and metallic bonding character.     

A paddlewheel dinuclear Cu(II) compound coordinated with TTF-py redox ligand

A new paddlewheel dinuclear complex with a pyridyl-tetrathiafulvalene (TTF-py) ligand has been obtained and characterized crystallographically as [(DMT-TTF-py)₂Cu₂(OAc)₄]·2C₆H₆ (1). Meanwhile a mononuclear compound [(DMT-TTF-py)₂Cu(PhCOO)₂(CH₃OH)₂]·2CH₂Cl₂ (2) was also isolated. UV–vis spectra and cyclic voltammogram of the paddlewheel complex were studied, showing that compound 1 can undergo an oxidization to form a stable cation of [(DMT-TTF-py)₂Cu₂(OAc)₄]²⁺. By this strategy, compound 3, [(DMT-TTF-py)₂Cu₂(OAc)₄](I₃)₂ as a radical salt, has been prepared and its conductivity of powder sample was 1.02 × 10^?3 ohm^?1 cm^?1. Antiferromagnetic coupling of Cu(II)–Cu(II) was found from the results of ESR spectra, but the coupling between the radical–Cu(II) was very weak.