Advanced Materials Research Vols. 239-242

Abstract: The rolling force model and energy calculation equation for 20CrMnTi steel are constructed based on practically measured data and theoretical math model. In the practical production, the heating temperature of 20CrMnTi steel is lowered from 1150°C to 1050°C, and in consequence, the total energy consumption is reduced by 5.81%. Moreover, the mill and motor abilities are still met and the rolled goods’ properties and surface quality are still guaranteed. Thus, energy saving is successfully realized.

Abstract: The paper attempts to investigate the interaction between sandstones and some drilling fluids components, including inorganic salts and surfacant ZJBS, as well as the influence on ROP imposed by them. The mechanism of the experiment is initially achieved. The results show that Al³⁺ and ZJBS both can improve the ROP. The ROP will be enhanced by 33.7% when AlCl₃ concentration is up to 0.01mol/L, and Al³⁺ enables zeta potential of the solution containing cuttings shifted from negative value to zero , and finally to positive value by means of analyzing zeta potential, which contributes to the significant improvement of ROP when zeta potential is greater than -10mV. Higher surface free energy created by the close-to-zero zeta potential is conducive to crushing rocks, which in turn increases the ROP and meanwhile reduces drilling costs. The ZJBS also can change the zeta potential of the cuttings and it has good compatiblity with sandstone. When its concentration is up to 0.01mol/L, the permeability rate of ZJBS is 15 times than that of distilled water. The ZJBS can effectively improve the efficiency of interaction between drilling fluids and this will be helpful to enhance the ROP.

Abstract: Electroconductive TiN/O′-Sialon multiphase ceramics were prepared by pressureless sintering from TiN/O′-Sialon powders as the chief raw material which were synthesized by the carbothermal reduction nitridation method using high titania slag, silicon fume and bauxite chalmette. Phase compositions and were analyzed. The effect of microstructure and TiO₂ content in initial raw materials on electrical conductivity were studied by SEM and TEM. The electro-discharge machining (EDM) of the materials was carried out. The results show that the sintered samples consist of O′-Sialon and TiN. O′-Sialon grains exhibit equiaxied morphology and the particle sizes are about 1-3μm. TiN grains exhibit fine granular morphology and most of grains have lower size than 0.5μm. The minimum amount of TiO₂ in initial raw materials is 25wt% for the formation of electroconductive network in the multiphase ceramics, of which the electrical resistivity is 1.8×10^-2 Ω·cm and meets the requirement of electrical discharge machining.

Abstract: Membrane emulsification-suspension polymerization method was introduced to prepare the monodisperse hypercrosslinked adsorbents ZQ-1 and ZQ-2 which can be used in solid phase extraction (SPE). Compared with the commercially available adsorbent Lichrolut EN, ZQ-1 exhibits obvious superiority for five conventional polar analytes owing to its large specific surface area, hydrophilic groups and small particle size.

Abstract: Pulverized Coal Injection (PCI) is a key technology in modern ironmaking by blast furnace and the life of injection lance has a great influence on PCI operation and on normal running of blast furnace. It is found that the main reasons for the failure of the lances are their outer surface oxidation and the inner surface erosion through monitoring some lances used in BF. The outer surface oxidation of the lances made of lCr18Ni9Ti is inevitable under high hot blast temperature condition through thermodynamics analysis. Increasing the inner surface hardness by surface treatment would prolong the service life of coal lance. The anti-oxidation temperature of lance materials needs to be over 1000°C for BF intensified smelting.

Abstract: Cyanoethyl cellulose (CEC) with high degree of substitution and uniform distribution was synthesized by solvent method. The choice of solvent, control of base volume, feeding methods and other factors were optimized , toluene/isopropanol (85/15) is the best solvent . Using FT-IR, elemental analysis, TG, DMA, X-ray and other means, we compared the structure, degree of substitution, the crystallinity, thermal stability, dynamic mechanical properties, dielectric properties and acid and alkali resistance between the CECs by solvent method and traditional method. The CEC products by solvent method showed lower crystallinity due to its more uniform distribution, better thermal stable, similar high dielectric with a lower DS , and higher Tg and better resistance to the acid and/or alkaline than CEC by traditional method.Those findings demonstrated solvent method was a new facile and industrial method to synthesize high substituted and uniform distributed cyanoethyl celluloses with good performances.

Abstract: The effect of applied potential on the stress corrosion cracking (SCC) initiation of X-70 pipeline steel in near-neutral pH solution has been investigated by using a slow strain rate testing (SSRT) apparatus and electric potential drop (EPD) method. It was found from the SSRT results that the initiation stress decreased with the decrease in the potential from -790mV_SCE to -950mV_SCE. But the initiation stress increased when the applied potential was at -1100mV_SCE and then decreased at -1200mV_SCE. The initiation stress also decreased when the anodic potentials were applied to the samples. SEM observations favored the above SSRT results.

Abstract: In this work, the capacity of an electronic nose (E-nose, PEN2) to classify tea quality grades is investigated. Three tea groups with different quality grades were harvested at different times. Principal component analysis (PCA) and artificial neural network (ANN) were applied to identify the different tea samples. PCA provided perfect classification of tea quality grades. In the analysis of age, six groups of XinyangMaojian green tea were distinguished completely by PCA. The results of ANN analysis gave a high percentage of correct discrimination of green tea samples. The correct identification rates of the training and testing data were 98.6% and 83%, respectively, for three grades of green tea samples harvested in 2009. The correct identification rates of the training and testing data were 100% and 87.8%, respectively, for three grades of green tea samples harvested in 2010. In the analysis of age, the correct discrimination percentages for six groups of XinyangMaojian green tea were 99.4% and 88.9% for training and testing data, respectively. These results indicate that the electronic nose could be successfully used for the detection of teas of different quality grades and ages.

Abstract: Nanoporous carbons were prepared from rice husk (RH) according to a three-step procedure that includes pre-carbonization, silica removal and chemical activation. The surface area and pore structure of the nanoporous carbons are characterized intensively using N₂ adsorption technique. The as-prepared carbons have specific surface area of up to 3283 m²/g, and total pore volume of up to 1.8 cm³/g. The effect of activating agent dosage on the pore structure of carbons was investigated and elucidated clearly. As evidenced by electrochemical measurements, the as-prepared carbons have good capacitive performances and their specific capacitances are much higher than ordered mesoporous carbon, thus highlighting the success of preparing high performance electrode material for EDLC from a biomass waste, rice husk.

Abstract: Based on the analysis of carbon fibers production technology,a new carbon fibers production line has been developed.It is made up of pre-oxidization furnaces, carbonization furnaces,and a new computer control system.Practical operation showed that the line has correct design,high temperature control accuracy,stable property and reliable operating characteristics.The line can be used to produce carbon fibers satisfactorily.