Advanced Materials Research Vols. 472-475

Abstract: Alumina (Al₂O₃) cutting tools have been coated with carbon coating using physical vapor deposition (PVD) to improve its wear resistance. The cutting tools were subjected to surface pretreatments namely blasting and acid etching to improve the coating adhesion onto the substrates. The effects of pretreatments on the cutting tools topography prior to deposition were investigated using atomic force microscopy (AFM) while the surface morphology was investigated using scanning electron microscopy (SEM). The adhesion strength of the carbon coating was investigated using microscratch. This study shows that although the coating were deposited evenly on the surface, the cutting tool that was blasted prior to deposition has better adhesion strength when compared to acid etching and no-pretreatment.

Abstract: Due to the large amount of straw in the double cropping area of the northern part in China, this paper developed an anti-blocking device in rotary tillage with three different types: ribbon, grinding and breaking the stubbles. Through analyzing the mechanism of anti-blocking devices, the relationship parameters of the passing ability of equipment, quantity of soil disturbance, fuel consumption and crop growth are identified. Field experiments demonstrate that adopting different anti-blocking devices in the dynamic driving type can produce different seed beds, can influence the quantity of soil disturbance of no-tillage land as well as the roots growth of wheat . By comparing the properties of no-tillage seeding of three anti-blocking devices ,such as quantity of soil disturbance, fuel consumption per unit and the growth of wheat (emergence number, tiller number, secondary root number and dry weight per plant), the impact of grinding type of ribbon is the best, rotary tillage type of ribbon takes second place, type of breaking the stubbles of ribbon rebases.

Abstract: Experiment with intensity level for the LC30 ceramsite concrete as the research object, changing the content of cement, GRT fiber, rubber powder by the orthogonal test to configure GRT fiber—rubberized haydite concrete samples, maintenance samples 7d and 28d in standard conditions and respectively testing their standard compressive strength. Through the analysis of the test data, using multiple regression analysis established the GRT fiber—rubberized haydite concrete 7d and 28d standard compressive strength regression formulas.By means of BP neural network theory combine MATLAB programme established GRT fiber—rubberized haydite concrete 7d and 28d standard compressive strength neural network model.Finally using 3 groups new test data to compare the value of multiple regression equations and BP neural network’s predicted value.The results indicate that the multiple regression equations and BP neural network model are availabled.

Abstract: The poly(ethyleneteraphthalate)(PET) fabric was semi-encased sucrose ester at high pressure and high temperature to endue it enough –OH, and then the PET fabric was modified with peanut protein through crosslinkage. The FT-IR spectra showed the peanut protein was grafted on PET fabric, the X-ray diffraction spectra showed the structure of grafting peanut protein was random coin, and DSC thermograms showed the thermostability of PET fabric grafted peanut protein kept very well. The wearability of PET fabric grafted peanut protein was measured too. The results showed the hydrophilicity and antistatic property of fabric was improved greatly, the cockle elasticity and broken strength kept very well. Though the whiteness of fabric decreased after grafting peanut protein, it could be bleached with normal method. These showed the PET peanut protein composite fabric was high functional.

Abstract: Electroless nickel plating with potassium titanate whisker was co-deposited on medium carbon steel substrates. The microstructure of the composite coatings was investigated. The effect of aging temperature on the microstructure of the composite coatings was studied using X-ray diffraction. The results indicate that the composite coatings will turn into crystal state with increasing heat treatment temperature. Experimental results also show that a maximum hardness is achieved for the composite coating after heat treatment at 400°C for 1 hour. The corrosion resistance and tribological properties of the composite coatings are not inferior to those of electroless Ni-P coating.

Abstract: A curvilinear-tooth face-gear has been developed in order to obtain a high contact ratio, reduced bending stresses and lower sliding velocities compared to the spur and helical involute face-gear drives. The generation of the face gear is based on application of a tilted head-cutter whereas the conventional method of generation is based on application of a hob. The tooth surface model of the face-gear is established, and then bending stress analysis is performed by using Finite Element Method. The developed theory is illustrated with numerical examples.

Abstract: This paper investigates the Wire Electric Discharge Machining of Titanium alloy 6-2-4-2.Eight process parameters namely pulse-on time, pulse-off time, peak current, spark gap set voltage, wire feed, wire tension, water pressure, pulse peak voltage and servo feed are varied to study their effect on surface roughness and wire breakage. The experiments are conducted using one-factor-at-a-time approach. Moreover, a few random experiments are also carried to study the phenomenon of wire breakage precisely. The study revealed that surface roughness is directly affected by the pulse-on time, pulse-off time, peak- current, spark gap set voltage and wire tension. Wire feed, Water pressure and pulse peak voltage have negligible effect on the surface roughness. Moreover, wire breakage is predominantly dictated by all the parameters except peak current and pulse peak voltage. An optimum range of input parameters has been bracketed as the final outcome for cutting in terms of surface roughness and to minimize the wire breakage frequency.

Abstract: Textile substrates can be coated with suitable polymer solutions to enhance the surface functionality. This paper highlights the deposition of chitosan (CHT) on wool nonwoven substrates using traditional pad-dry-cure method; and its potential application in medical textiles specifically wound dressing products. Wool nonwoven substrates were prepared by pre-treating with BMIMCl (ionic liquid) and application with different concentrations of CHT. The liquid uptake and antimicrobial efficacy was evaluated. It was shown that 0.3% CHT treated samples demonstrated good liquid uptake and excellent antimicrobial properties.

Abstract: In this study , a type of compound hydrophilic chain extenders composed of a polyol containing short sulfonated side chain ,designated as DHPS and dimethylolpropanoic acid( DMPA), were used to prepare high-solid content waterborne polyurethane by self-emulsification .The effect of ratio of DHPS and DMPA on morpholog and the particle size of waterborne polyurethane were analyzed. The effect of ratio of DHPS and DMPA ,the addition of CaCl2 solution and HCl solution ,dilution on conductivity of waterborne polyurethane were investigated. The results show that the WPU dispersions exhibit the spherical particles and the characteristic of wide size distribution, the average diameter and distribution became smaller and narrower with the ratio of DHPS and DMPA increasing. With an increase of ratio of DHPS and DMPA conductivity increased. At the same time , conductivity changed with the addition of CaCl2 and HCl solutions content.

Abstract: For a large percentage of control systems, the primary objective is to obtain high steady-state accuracy. Another goal is to maintain the transient performance of these systems within reasonable limits. The steady-state accuracy of many feedback systems can be increased by increasing the amplifier gain in the forward channel. We will describe the design of the integration compensation networks in order to obtain a suitable system performance.