Advanced Materials Research Vols. 189-193

Abstract: This study is of aluminum alloy electroplating process pH alloy electroplating Ni-SiC properties. Research shows that the results show that, when the bath pH for 4.0, plating coating uniform structure, compact, the best performance, coating and maximum SiC content.

Abstract: The influence of different particle size and filling amount of particles of cornstalks on the density and compressive strength of polyurethane foam plastic board has been studied in this paper. The results indicate that the comprehensive properties of polyurethane foam plastic board is better when the particle size varies from 0.45 to 1.5mm and the filling amount is 30% which could meet the needs of avoiding the frost heaving failure in the canal lining blocks. And compared with the foam plastic board without filling particles, the property can be equal with particles of cornstalks filled in, but the cost can be reduced about 25%. Meanwhile, the cornstalks are fully reused, which also help protect the environment.

Abstract: In this study, the hybrid fiber prefabricated parts composed of short Al₂O₃ and carbon fiber are made successful by vacuum subatmospheric shaping method. The ZLl09 alloy reinforced by the prefabricated Al₂O₃ and carbon fiber are prepared by squeeze casting method with fiber contents. The effects of carbon fiber on fraction and wear properties of the hybrid composites with fixed Al₂O₃ fiber volume fraction 10% were investigated.

Abstract: Fluid magnetic abrasivetool is a kind of suspension, which is composed of soft magnetic particles, surfactants, base liquid and so on so forth, so it can have strong magnetorheological characteristics and grinding characteristics. The stability of magnetorheological fluid is one of the most important indicator to evaluate the quality of magnetorheological fluid. Sodium hexametaphosphate and PAA have perfect function to maintain dispersionstability and retrogradation, adding nano-silica can improve the retrogradation of magnetic abrasivetool, which can modify redispersibility of magnetic abrasivetool.

Abstract: The ternary Ni-W-P alloy coatings were deposited on the surface of Q235 steel using Chemical deposition. The microstructure, phase analysis, plating velocity and hardness were investigated with scanning electron microscope, X-ray diffraction technique and Vickers hardness tester. The results showed that the plating rate had been increased firstly, and then decreased with the increment of sodium citrate concentration in the range of 20-80g/L, the maximum plating velocity was 9.14μm/h. The hardness of Ni-W-P plating increased first and then decreased with the increment of sodium citrate concentration, the maximum hardness was 643HV when the concentration of sodium citrate was 40g/L. When the concentration of sodium citrate was 40g/L, the substrate was completely covered by Ni-W-P plating, the surface was composed of uniform crystalline grains, and had no obvious defects and presented amorphous. The coating and substrate were relatively strong, the coating had no the phenomena of fall off and crackle in the bending and files tests when the concentration of sodium citrate was 40g/L and 50g/L respectively.

Abstract: As the intelligent machine and manufacturing system plays an important role in the near future, the monitoring system in turning process is required to improve the productivity during the cutting process. Hence, the aim of this research is to propose and develop the in-process monitoring system of the tool wear and the cutting states of chip and chatter for the carbon steel in CNC turning process by utilizing the sensor fusion which are the force sensor, the sound sensor, the accelerometer sensor and the acoustic emission sensor. Their signals have been integrated via the neural network with the back propagation and the pattern recognition technique to monitor the tool wear and detect the cutting states which are the continuous chip, the broken chip and the chatter occurred. The experimentally obtained results showed that the in-process monitoring system proposed and developed in this research can be effectively used to estimate the tool wear level and identify the chip breaking and the chatter with the higher accuracy and reliability.

Abstract: Ni/WC surface infiltrated composite layer was fabricated on gray iron substrate through vacuum infiltration casting technique using Ni-based powder and WC particles with different content as raw materials. The compact infiltrated composite layer was obtained on the condition of appropriate choice of processing condition such as pouring temperature, preheating temperature, thickness of preform and the grain size of powder. The infiltrated layer includes surface composite layer and transition layer, and the thickness of transition layer decreases with the increasing content of WC. Three-point bending tests were performed to investigate the mechanical and metallurgical properties of the surface infiltrated composite layer. It was found that load-holding circumstance appeared for specimen with infiltrated layer during the process of three-point bending, and there was no this circumstance for substrate during bending process. The load and displacement decreased with the increasing content of WC when the load-holding circumstance happened. The fracture extended to the substrate for all specimens with surface infiltrated composite layer, and the fracture form was similar for all specimens with different WC content. The WC particles were the source of micro-crack for surface infiltrated layer, and the graphite was the source of micro-crack for gray iron substrate.

Abstract: As part of a strategy for reducing the risk of rollover crashes and the significant injuries resulting from those crashes the National Highway Traffic Safety Administration (NHTSA) is proposing changes to its former roof crush standard (FMVSS 216). This paper provides an overview of the substantial benefits of utilizing structural reinforce parts as a cost-effective means of significantly improving roof crush performance. In the past several years structural reinforced parts have gone through the transformation from interesting concept to viable alternative for the improvement of vehicle structures. Finally, this paper will introduce study investigated the utilization of these types of products as both a stand-alone solution and as part of a “hybrid” solution coupled with traditional metal solutions.

Abstract: In this work, the effects of concentration and mixture ratio of Ca(CH₃COO)₂•H₂O and Na₅P₃O₁₀ in electrolyte on surface morphology, surface content and atomic ratio of calcium and phosphorus elements, and phase structure of ceramic coating prepared by micro-arc oxidation（MAO）on TC4 titanium alloy were studied, a suitable formula of electrolyte for bio-modification of titanium by MAO was obtained, Ca(CH₃COO)₂•H₂O 20 g/L and Na₅P₃O₁₀ 9.3 g/L. Using this electrolyte with appropriate process conditions, the ceramic coating was prepared with porosity structure and combines well with the substrate. The pores distributed equably on the surface of ceramic coating and the size of the pores was in micron order. The surface of the ceramic coating contains calcium, phosphorus elements and their atom ratio is about 1.69 which nears to that of hydroxyapatite. The ceramic coating was composed of titanium dioxide in different crystal types which have been characterized by the X-ray diffraction (XRD). The anatase titanium dioxide was a major component.

Abstract: A new kind of Ni-Cu-coated calcium-magnesium silicate whiskers was prepared by electroless plating and characterized by EDS, SEM and XRD. And the preparation and shielding performance of a new kind of Ni-Cu-coated calcium-magnesium silicate whisker/nickel powder/epoxy resin electromagnetic shielding coatings were explained. The study results show the Ni-Cu-coated whisker with micro-sized spinal structure contains 12.4 wt% Ni and 1.35 wt% Cu. When the coating layer thickness is 300 μm, the shielding effectiveness of the coatings containing 4 wt% Ni-Cu-coated calcium-magnesium silicate whisker is up to 39.24-48.52 dB and increased an average of 10.38 dB compared with the nickel powder/epoxy resin electromagnetic shielding coatings in the frequency range of 0.3-1000 MHz. This offers a new idea to raise the levels of the comprehensive utilization of mineral resources and the prevention of electromagnetic environmental pollution.