Advanced Materials Research Vols. 189-193

Abstract: Iridium (Ir) could be taken as high temperature protective coating for the refractory metals. Ir coating was deposited on the surface of molybdenum (Mo) substrate by double glow plasma. Thermal stability of the coating was investigated at 1400°C for 90 min, while Ar gas was inputted to hold the vacuum pressure. The microstructure of the surface and interface of the Ir coating were observed by SEM and TEM. The phase transition of the coating was determined by X-ray diffraction. Many micropores and microbubbles appeared in the surface of the as-heat treated coating. The interfacial reaction between the Mo substrate and Ir coating occurred during heat treatment, and Ir21.5Mo8.5 phase was formed at 1400°C. The experimental results indicated that the integrity of the Ir coating was not degraded after heat treatment.

Abstract: Surface texturing is a widely accepted approach for friction reduction in mechanical components. Through-mask electrochemical micromachining (EMM) is a simple and reliable process for mass manufacturing of microstructure array on metal surface. However, to obtain engineered surface texture with a prescribed shape, size, orientation, and distribution to investigate how forms and shapes of surface texturing affect the tribological properties on interacting surfaces, the machining conditions still need to be optimized. In this work, the electroetching conditions involving the formulation of the electrolyte, voltage, current density, machining gap and agitation method are optimized. With the optimized conditions, the ordered microstructures with a feature size down to 5m and smooth etched surface in large-scale are obtained and the preliminary friction drag reduction effect of the textured surface is demonstrated.

Abstract: The rolling contact wear is a severe problem and meets with much widespread interest in the world. This paper describes an numerical method and simulation experiment investigation on the rail wear affected by the curve radius and axle load etc. The creep force ,stick/slip areas of contact particles, and friction work of wheel/rail in static condition are analyzed by kalker’s program CONTACT. The effect of curve radius and axle load on rolling wear behaviour of rail is investigated by simulation experiment. The results of numerical and experiment indicates that with the decreasing of curve radius and the increasing of axle load, the wear value of rail increase nonlinearly, especially in the condition of the curve radius is less than 1200m,the wear value of rail increase rapidly. And with the decrease of curve radius, the maximum slippage decrease gradually, and the stick areas decrease while the slip areas increase. The growth speed of friction work of wheel/rail in the condition of smaller curve radius and heavier axle load is faster than in the condition of larger curve radius (straigth line) and lighter axle load.

Abstract: The Underwater Glider is a novel Autonomous Underwater Vehicle for ocean monitoring. ANSYS based optimization technology is utilized for lightweight design and research of underwater gliders. The numerical 3D model of the shell is constructed and the structural strength is analyzed. A modified design is introduced and then is optimized by ANSYS optimal process. The optimal lightweight structure is fully evaluated and proved to be successful. This design will improve the glider’s performance and the pressure hull strength, at the same time, it will reduce the weight and cost of the glider. In addition, this approach may provide a new guidance for further hull design of the underwater glider.

Abstract: In this paper the nanostructured and conventional WC-12Co feedstock powders were thermally sprayed via high velocity oxy-fuel (HVOF) on the mild steel substrate. The influence of the feedstock powder type on the microstructure of coatings and abrasive wear resistance properties was studied. The correlation between the coating microstructure and the wear performance was investigated by analyzing the microstructure and worn surface morphology of the coatings. The results indicated that the nanostructured coating shows higher porosity, but slightly higher microhardness and better abrasive wear resistance than the conventional counterpart. Also, the two coatings have excellent abrasive wear resistance with respect to the substrate.

Abstract: Dyed Wood is rapidly degraded by short-wavelength UV radiation, and its degree of discoloration correlate well with the wave length. In the paper we test this hypothesis and analyze chemical change of dyed wood surface affected by UV radiation. So that it will be beneficial for further study on synthesis of photo stabilizer. In this research, dyed veneers are irradiated by artificial light using an ultraviolet accelerated weathering device including 5 different wavelengths (UV to visible). CIE (1976) L*a*b* color measuring system is applied to describe the photo-induced discoloration process of dyed veneer. The reflection curves of spectrum and K-M difference spectra show the diverse change of light absorption and reflection. The results reveal that, samples color is great influenced by 313nm and 340nm UV light, the color stability of dye stuffs is rapidly decreased while stimulated by 254nm UV light. The fastness of dyed veneer has a positive relationship with dye stuffs, Acid Red GR dyed veneer just suffer slight yellowing due to the stability of dye, while Acid Blue V dyed veneer fade obviously and get a tendency of reddish.

Abstract: The paper introduces a estimation method of turning cost applied to various kinds of lathe. The method can estimate the lathe machining cost of product in initial design and feedback the cost information for the designers improvement design and improve the market competitiveness of product.

Abstract: The low production rate of electrospinning process may limit the industrial use of single needle system. To meet high yield requirement and uniform fibers, a bottom-up multiple jets electrospinning nozzle was designed. The influence of electric field interference on jet path, membrane shape and fiber morphology was investigated. Experiment finds that electrical field strength in the closer part of two nozzles is weakened due to electric field interference when the distance between two nozzles is close. Electric field, jet path, fiber web shape and fiber morphology of three nozzles electrospinning with linear arrangement, equilateral triangle arrangement and isosceles right triangle arrangement were also compared. Results show that electric field and spun fibers of three nozzles electrospinning with equilateral triangle arrangement is the most uniform.

Abstract: A few problems, which appear in current Chinese developing design field, will be focus on in this article. The relationship between the traditional culture, inheriting of the culture and industrial design will be analyzed by the example of different country traditional culture embedded with different design. And, some characteristic of Chinese traditional culture has also been discussed. The relation will be clear on thinking to "person". The cultural inheriting will be embodying in design, realizing tradition and culture on the connotation.

Abstract: In order to build the software evaluation and testing platform for surface topography measuring device and related enterprise, it is urgent to exploit the surface topography measurement and evaluation standard software application system. This paper proposes a novel method of surface topography design software base on exiting international standards. The method is introduced to obtain the reference line of surface profile. According to the reference line of surface roughness defined by the related standards, the functional evaluation parameters of surface characteristics were calculated. The procedure in designing the graphical user interface (GUI) is given based on the MATLAB software platform. This method realizes the software system that can evaluate the parameters of surface topography. The experimental analysis results show that the surface topography functional evaluation software using MATLAB has simple structure and reliable performance.