Advanced Materials Research Vol. 815

Abstract: TiB₂ and Gd₂O₃ were used as codeposited particles for the first time in preparing Ni-TiB₂-Gd₂O₃ composite coatings to improve its performance. Ni-TiB₂-Gd₂O₃ composite coatings were prepared by electrodeposition method from a nickel cetyltrimethylammonium bromide and hexadecylpyridinium bromide solution containing TiB₂ and Gd₂O₃ particles. The content of codeposited TiB₂ and Gd₂O₃ in the composite coatings was controlled by the addition of different TiB₂ and Gd₂O₃ particles concentrations in the solution, respectively. The effects of TiB₂ and Gd₂O₃ content on microhardness, wear weight loss, and friction coefficient of composite coatings were investigated, respectively. Ni-TiB₂-Gd₂O₃ composite coatings shows higher microhardness and lower wear weight loss, friction coefficient than those of the pure Ni coating and Ni-TiB₂ composite coatings. The wear weight loss of Ni-TiB₂-Gd₂O₃ composite coatings is lower 9.13 and 1.59 times than that of the pure Ni coating and Ni-TiB₂ composite coatings, respectively. The friction coefficients of pure Ni coating, Ni-TiB₂ and Ni-TiB₂-Gd₂O₃ composite coatings are 0.723, 0.815 and 0.43, respectively. Ni-TiB₂-Gd₂O₃ composite coatings shows the least friction coefficient among the three coatings. Gd₂O₃ particles in composite coatings serves as solid lubricant between contact surfaces, decreases the friction coefficient, abates the wear and increases the corrosion resistance of the composite coatings. The loading-bearing capacity and the wear-reducing effect of the Gd₂O₃ particles in the composite coatings are closely related to the content of Gd₂O₃ particles in the composite coatings.

Abstract: The effect of PP-g-AN prepared by solid phase grafting on the blends of PP/PP-g-AN was investigated in this paper. The influence of aging testing time, PP-g-AN additives concentration, shear rate on the rheological properties and anti-aging properties of PP/PP-g-AN were mainly discussed. The results show that PP/PP-g-AN blends are pseudoplastic fluid and the presence of PP-g-AN can restrain the degradation of polypropylene when the content of PP-g-AN is in a certain range.

Abstract: t is of great importance to find ways to lubricate ZrO₂ceramic. In this paper, a kind of ZrO₂ matrix high temperature self-lubricating compositewith addition of CaF₂ and graphite as lubricants was prepared by hot-pressing. It was found that the tribological properties of ZrO₂(Y₂O₃)-CaF₂-graphiteshow a good tribological behavior both at low temperature and high temperatures. The low friction coefficients of ZrO₂ (Y₂O₃)-Mo-CaF₂-graphite at high temperatures were due to the perfect lubricity of CaMoO₄ which was formed on the worn surface at high temperatures.

Abstract: Through the preparation of conductive silicone rubber samples, and the study of its electrical characteristics, this paper expounds the conductive silicone rubber composites relationship between the resistance and applied pressure. It discusses the main influencing factors of the piezoresistive effect. It studies conductive silicone rubber in four different conductive particles as well as the piezoresistive behavior of blending with a variety of fillers. It analyzes conductive silicone rubber samples after adding nanometer material of the piezoresistive properties. The study shows that blending with a variety of appropriate fillers material can improve the linearity of the piezoresistive relationship of the conductive silicon rubber and effectively expand the resistance variable range.

Abstract: In order to improve the hydrophilic performances, the surface of poly films was modified through grafting polymerization of styrene (ST) initiated by ultraviolet (UV) in ethanol/water mixture solution. The effects of irradiation time, concentration of inhibitor (ferrous ammonium sulfate) on the grafting degree of ST will be investigated. The original and grafted poly films were characterized by scanning electron microscopy (SEM) and Static contact angle (CA), to characterize the chemical changes of the poly film surface. The results showed that the hydrophilic of poly films was improved significantly than that of the original film. The contact angle of PO-g-ST increased from 70° to 120.4° over a critical grafting degree of 26.35%, the hydrophilic of PP membranes improved dramatically.

Abstract: Honeycomb shaped monolithic Fe-β zeolite catalyst for N₂O decomposition prepared by direct extrusion method was investigated. In this paper, we optimized the parameters of the molding process and studied the decomposition properties of the honeycomb catalysts. Monolithic materials could be extruded successfully only with the plasticity ranging from 0.177 to 0.473. The content of SB powder, nitrate and water was shown to have a significant influence on the mechanical strength of the extruded materials. The monolithic samples were characterized by using XRD. Catalytic performances of various monolithic zeolites with diverse density (49 cells/in.2, 81cells/in.2, 169 cells/in.2) were thereafter studied. As shown from the result, catalyst activity increased significantly with the increase of monolithic catalyst density.

Abstract: This paper deals with the wood-plastics composite (WPC) application in furniture. Firstly, it reviews WPC properties and its synthetic process; Secondly, it expounds the application of WPC in furniture in terms of design, manufacturing and joining mode; Finally, it summarizes limitations of WPC application in furniture in current condition and gives several suggestions on its further development.

Abstract: In order to realize the realistic applications of hydrophobic surfaces in large scales, its essential to develop new methods for the fabrication of these surfaces at low cost. In this paper, we demonstrate a novel and inexpensive method to prepare hydrophobic thin films on glass substrates. At first, we applied polydimethylsiloxane to modify the glass substrates, followed by adding nanocandle soot particles onto the surface of polydimethylsiloxane. After solidification in blast oven, we obtained the hydrophobic surfaces on the glass substrates. The resultant surfaces with contact angle of 143^o exhibit remarkable hydrophobic properties. This new method is very simple and holds great potential in the widespread practical production of hydrophobic surfaces.

Abstract: Fluid loss additive is the main component of the cementing fluid. This article use monomer the monomers of 2-acrylamido-2-methyl-propanesulphonic acid (AMPS) and N, N-dimethyl acrylamide (DMAA) by the method of aqueous solution polymerization to synthesis the novel fluid loss additive ANMG1305. Discuss the amount of initiator, the molar ratio of monomer, reaction temperature, which the influence on the properties of the polymer. Through the infrared spectrum, thermo-gravimetric analyzer, viscometer, such as instrument on its microstructure and properties were characterized. We know that all the monomers are involved in the reaction and the polymer has an excellent thermal stability though the microstructural characterization and application performance of the novel fluid loss additive.

Abstract: In this paper, a screen-printed LaB₆ discontinuous film is coated on the MgO protective layer to meet the market for low power requirement of AC PDP. The surface appearance, optical transmittance and conductivity properties of the screen-printed LaB₆/MgO double protective film are studied by changing the slurry contents and annealing temperature. It is found that when the mass ratio of LaB₆ powder in the printed slurry is 1%, the transmittance of the film is above 90% with excellent insulation properties. The SEM shows that LaB₆ particles are randomly distributed on the smooth MgO layer surface and distances among LaB₆ islands are at least several micron dimensions. Besides, XRD patterns indicate that when the annealing temperature is 500°C, the LaB₆ film exhibits a strong preferred orientation to the (100) plane, which is beneficial to improve the performance of AC PDP.