Advanced Materials Research Vols. 314-316

Abstract: In order to improve the corrosion and wear resistance of AZ31B magnesium alloy, Ni alloy cladding layer which had no crack and hole on AZ31B magnesium substrate was created by a 5kW continuous wave CO₂ laser. The microstructure was analysed by means of OM(Optical Microscope) and XRD(X-ray Diffraction), the electrochemical corrosion and the abrasion performance were also tested by electrochemical corrosion equipment and the abrasion testing machine. The results show that: the Ni alloy cladding layer can combine with the substrate metallargically, the microstructure of cladding layer is dendritic crystal, and becomes fine significantly from the interface to surface, and the phase of the cladding layer are MgNi₂、Mg₂Ni、Mg₂Ni₃Si、Mg₂Si and FeNi. Micro-hardness of the cladding layer is 470~601HV which is improved 840%~1102% to the substrate(40~50HV). Average friction coefficient of the cladding layer is 0.321 lower than AZ31B substrate, and the wear mass loss is 91.43% less than the substrate, the wear resistance of the cladded layer has been improved observably. The corrosion voltage of cladding layer moves 136~417mV to plus direction compared to AZ31B magnesium substrate, and the corrosion current of the cladding is 2~3 stages lower.

Abstract: This paper proposes capabilities of transparent glass window design with energy-saving and heat insulation for carbon reduction issues. An optical thin film coating technology is used for coating multilayered dielectric materials on the transparent glass to achieve an infrared ray shielding effect; especially to prevent rising temperature easily of indoor room. That is infrared ray incidence from outdoor and the thermal flux effect of the transparent window influent the indoor room temperature. In winter, the outdoor temperature is increased more easily by infrared ray incidence. However, the heat insulation window allows 98% of visible light penetration through the window and also allows 90% of infrared light reflection and roughly 10% of infrared light penetration into indoor.

Abstract: Exploring and using surface engineering technology into the Anti-aging antibacterial mold of mulberry silk brocade fabrics through multiple dipping and padding to carry out limited permeation and effective bonding strength on material surface. It has obvious effect on antibiotic action and less effect on the silk materials’ original performance.

Abstract: The aim of the work was to clad Ti-Ta-Nb coating on a substrate of pure titanium. Cladding was carried out by non-vacuum electron-beam treatment. As a result a good quality coating thickness of about 2 mm was obtained. Microstructural and microhardness tests were conducted. Dendritic structure and the borders of the former grains of β-phase were revealed. At the microlevel, the coating has a martensitic structure. The average hardness of coating is about 4000 MPa.

Abstract: Material mechanics and dynamic properties affect the service life of parts, and also the normal operation of machines. In order to reduce the processing time and improve the quality of machining, a cylindrical roller was used in the research. Cylindrical ultrasonic rolling machining (CURM) is an efficient way to enhance the service properties and surface characteristics of components. CURM was designed and later tested on the 45# steel surface. The result showed that the plastic deformation of surface layer was symmetrical and the surface grain was reduced in size by approximately 4.2%. The result of the experiment showed that CURM was effective in enhancing the productivity as well as enlarging the yield strength and hardness of components.

Abstract: A kind of self-shielded carbonitride alloying flux-cored wire was developed. Wear resistant coatings was prepared on the surface of the Q235 low-carbon steel by HAVS using the wire. Detection and analysis on the microstructure and properties of the coatings were done by the equipments such as scanning electron microscope, microhardness tester and wear tester. The forming, the wear resistance and its mechanism of the coating were studied. The results show that the coating has good forming property, uniformity of microstructure and compact structure, but the coating also has large oxidate and porosity, this may due to gasforming and slagforming constituents in the wire; the coatings has high hardness, the average microhardness value reachs 510 HV0.1, and the highest value up to about 560 HV0.1; the coatings has good abrasive wear performance and bonding strength.

Abstract: Different laser parameters and the interactional production can affect the barcode grade profoundly. In order to mark barcodes on aluminum alloy with a laser effectively, it is important to search out the optimum parameters and establish a relationship between critical laser parameters and the quality of the symbol. In this research, a Nd:YAG laser was utilized to produce 3136 Data Matrix symbols onto aluminum substrates. The experiment focuses on all interval values of the vector step, inter-step time, laser Q frequency and laser Q release time. From the experiment results, the optimized parameters are the vector step of 0.005~0.009 mm, the inter-step time of 29~43 μs, laser Q frequency of 7~10 KHz, and laser Q release time of 13~19 μs. And then, by analyzing the higher and the lower power density processing module SEM images and EDS data, it was found that the microstructure and micro-components of formations that created by the interaction between the laser and the aluminum alloy can affect the barcodes grade level significantly.

Abstract: Plasma thermal spraying technique was adopted to deposit five groups of different thickness 3% TiO2-Al2O3 coatings on 329-Stainless steel. A curvature method was applied to study the residual stresses. Results showed that the deformations corresponding to 3% TiO2-Al2O3/329-SS systems were serious. The residual stress changed with the ξ (ratio of coatings’ thickness to substrate’s thickness) value and weren’t constants for the coatings’ thickness 52-306 μm. No regardless of using the Stoney’ or Tomanov’ formula to calculate the residual stresses, which decreased with the ratio ξ value increased, and the thinner coatings were, the greater the residual stresses were. The coatings’ residual stresses changed with the ξ value at an exponent relation. The coatings’ thickness affects greatly on their residual stresses, especially for the intrinsic stresses. When the coatings thickness changes from 52 to 306 μm, the residual stresses were always compressive stresses. The maximums residual stresses were caused when the ξ value is 0.115 (the minimum value), and the details were -584.96 MPa and -482.78 MPa by two difference formulas, respectively.

Abstract: TiN films were deposited on the AZ 31 magnesium alloy substrates by d.c. magnetron sputtering technique. The surface properties of the films were investigated. The scanning electronic microscope observations reveal the dense structure characteristics of as-deposited TiN films. Under 200°C heat treatment for 30 minutes or 4 times’ heat cycles at 85°C for one hour, no structural defects such as cracks are observed on the surface of the films. Adhesion experiment further demonstrates the stability of the film and the strong combination between the film and the substrate. Nano-indentation experiment shows that the average micro-hardness of TiN film reaches 23.85 Gpa. Finally, the corrosion experiments in simulated body fluid initially reveal the degradation property of TiN film.