Advanced Materials Research Vol. 1119

Abstract: In this paper, APPJ (Atmospheric pressure Pules arc Plasma Jet) is used to generate a DC pulse source depositing GZO thin film under atmospheric pressure. Thus, no vacuum chamber needed leads to the cost downward. With scanning operation, makes single unit area into large size area. Several key process parameters have been studied, including the power supply voltage, DC pulse, the length of the nozzle extended head, and depositing gap to understand their relationship with the film quality and atmospheric plasma state.In this study, with adjusting DC pulse, the pulse frequency is found to have a great impact on the plasma state and the film quality. When the pulse frequency is near 25 kHz, lower sheet resistance can be retained. Besides, adjusting T_off time, the plasma and thin film quality are influenced more than T_on time. By changing the power supply voltage, the secondary-side voltage decreases with increasing of the instantaneous current; moreover, the plasma will become more intense.

Abstract: The hard anodizing process is performed on aluminum 3003 work-part in order to increase surface hardness and corrosion resistant. Due to the fact that a massive of heat is generated during the process and attributing to burn defect. Burning can be described as an uneven growth and destruction of the oxide layer. The interface between the barrier layer and the aluminum is not smooth on a microscopic scale. Metallic aluminum extends as many small projections into the barrier layer. These intermetallic phases, metallic needles, and/or other impurities transport the electric current easier than the aluminum oxide and as a consequence give rise to a short circuit through the barrier layer in these pores. When the current density concentrates in these pores the temperature will rise at the bottom of the pores and cause burning defect to the work-part. Thus, an analysis of reducing burn defect is implemented using an experimental design technique. It is founded that with an increasing of ramp time, sulfuric acid concentration, and agitation in the hard anodizing process without relaxing current density, burn defects are substantially reduced.

Abstract: Grafting polymerization by reactive small molecules involves the formation of graft copolymers from a reaction between polymers and monomers. Monomer units can be propagated onto the polymer backbone to form a graft structure. In the polymer processing industry, the internal mixer is the most important piece of machinery. The study used the internal mixer as a reactor to make a reactive process with the interest in residence time,as the residence time is importance in the chemical reaction. By increase the residence time, the optimum degree of grafting may be occurred. The objectives of this study are to increase the knowledge and understanding of the internal mixer process, determine optimum residence time process variables for grafting LLDPE and study the effect of the residence time toward the LLDPE grafting process. Several residence times was choosing for the specified sample, to study the effect of the residence time which were 60 s, 120 s, 180 s, 240 s, 300 s and 600 s. Degree of grafting (DOG) was calculated to determine the grafting of LLDPE grafted copolymers and a series of samples in which degrees of grafting had been determined by chemical titration. Residence time at 300 s produces the optimum DOG of monomer onto polymer. Longer residence time will produce high degree of grafting but will cause other issues such as increasing in gel content and lower the mechanical properties of the grafted polymer.

Abstract: This research was to determine the effect of Cerium and cooling rate on the microstructure of eutectic Al-11Si-Cu-Mg cast alloy. The Cerium was added to produce Al-11Si-Cu-Mg-1.5Ce alloys. The microstructure was characterized by optical microscope. The Si structure was modified with the increase of the cooling rate, where smaller area was achieved. Ce formed rich intermetallic phase, such as Al-Si-Ce.

Abstract: This research was to determine the effect of rare earth metal (REM) on the fluidity of eutectic Al-11Si-Cu-Mg cast alloy. The rare earth metal used here is Lanthanum to produce Al-11Si-Cu-Mg-0.1La, Al-11Si-Cu-Mg-0.5La and Al-11Si-Cu-Mg-1.0La alloys. The fluidity was measured by permanent spiral mold, pre-heated at 450°C. The microstructure was characterized by optical microscope. The fluidity of complex Al-11Si-Cu-Mg eutectic alloy decreased with the increase of La addition. The 1.0 % of La addition led to refinement of silica particles, which reduced the fluidity length by 25%.

Abstract: This paper presents the experimental investigation conducted on ADC12 cast alloy. The main objective of the research is to investigate the effect of 1.5%La addition with different cooling rate on microstructure and hardness value of ADC12 cast alloy. The Ceramic Mold with different thickness dimensions was use to obtained different cooling rate. The Si structure became modified by increase the cooling rate of base alloy. With La addition the Si size observed smaller area than base alloy when the cooling rate increases. In addition, the higher cooling rate and La addition improves the hardness specially at lower thickness with La addition.

Abstract: Titanium oxide (Ti-O) films were prepared by low-voltage (i.e., 5-15 V) anodization of titanium plate in different hydrochloric acid (HCl) concentrations. Phase composition and surface microstructure of the anodized sample were investigated through XRD and SEM characterizations. Samples anodized at 15 V and in 0.6, 1.5 and 3.0 M HCl concentrations show higher amount of crystalline TiO₂ (i.e., anatase and rutile) phases as compared to other anodizing conditions. The three samples show open pores microstructure on the anodized surface. Samples anodized at lower voltages and in low to medium HCl concentrations also produce loosely bonded amorphous Ti-O granules on top of the crystalline TiO₂ phases. After annealing these samples at 400 or 600°C in air, further oxidation occurred on the anodized surface particularly at pores, contribution to slight increase in the crystalline phase. It suspected that the presence of amorphous Ti-O granules on top of crystalline TiO₂ phases at initial anodizing stage, hindered movement of OH^- and Cl^- anions onto the anodized surface, thus inhibited further growth of the crystalline TiO₂ phases.

Abstract: The objective of this research is to investigate the effect of Zr, Nb and Ti additions on microstructural, mechanical and electrochemical properties of injection molded 316L stainless steel. The amount of additive powder plays a role in determining the sintered microstructure and all properties. In this study, 316L stainless steel powders used with the elemental Zr, Nb and Ti powders. The binders were completely removed from molded components by solvent and thermal debinding. The debinded samples were sintered at different temperature for 60 min. at different temperatures. Mechanical property, microstructural characterization and electrochemical property of the sintered samples were performed using tensile testing, hardness, optical, scanning electron microscopy and electrochemical experiments. Results of study showed that sintered 316L and 316L with additive powder samples exhibited high mechanical and corrosion properties in a physiological environment.

Abstract: The oil spill plate is a thin-walled type of mechanical model [1] ,the structure of stainless steel oil spill plate is analyzed precisely by using UG finite element method, it is concluded the structure displacement and stress changes at the bottom of the oil spill plate of the board structure and determine oil spill plate meets the production requirements or not. The conclusion provides theoretical support for the production practice.

Abstract: The five kinds of 1100, 1050, 1108, 8079 and 8079H alloy sheets have been prepared by melting, casting and rolling process and tensile strength and elongation of alloys have been tested at room temperature, 100°C, 200°C, 300 °C. For provide a reference of the mechanical properties for the applications of these alloys. It was indicated that the mechanical properties of alloys were significantly different at different operating temperatures, the overall trend is that the tensile strength (σ_b) of the alloys decreased significantly and the breaking elongation (ε_b) of the alloys remarkably increased with the increase of the testing temperatures. The tensile strength of the alloys are about 30MPa at 300°C, so the operating temperature of the alloys should be controlled below 300°C.