Advanced Materials Research Vols. 602-604

Abstract: In this paper, TiN coating as an interlayer was fabricated on Ti substrate by reactive plasma spray. Ti/TiN/Sb-SnO2 electrodes were prepared by SOL-GEL method and the influence of the TiN interlayer on the structure, oxygen evolution potential and service life of the electrodes was studied. It was shown that the surface of the Ti/TiN/Sb-SnO2 electrodes is more homogeneous and the oxygen evolution potential and accelerated life are both higher than those of the Ti/Sb-SnO2 electrodes.

Abstract: The intention of this paper is to review of some recent innovative novelties about paper and board pigment coating raw materials. First an overview is given of “traditional” coating raw materials and the coating process. Then new starch based pigments and binders as well as novel plastic pigments are reviewed regarding their effect on coated paper properties. Finally it is concluded that further innovations and research are needed.

Abstract: The glow discharge optical emission spectroscopy (GDOES) depth profiles of zinc-coated copper substrates polished by different mesh size sandpapers are well fitted with the mixing-roughness-information (MRI) model. Based on the MRI fits, the copper substrate roughness parameters and the coating layer thickness values are extracted. Using the so-called 84% to 16% method, the depth resolution values of the measured GDOES depth profiles are obtained, thereby the respective roughness parameters are determined. The obtained zinc-coated copper substrate roughness values are correlated with the experimental measurements.

Abstract: Glass-ceramics of Li2O-Al2O3-ZnO-SiO2 system coating on Q235 steel surface is prepared by sintering process, and improved hardness and fracture toughness of the coating through add appropriate ZrO2 in glass-ceramics. Post-mortem crystal process, sintering technology and microstructure of the coating were investigated by differential scanning calorimetry (DSC), X-Ray powder diffraction(XRD) and scanning electron microscope(SEM). Maximum bending force and fracture deflection were measured by three point bending method. Results showed that main crystal phase of the coating were Li2Al2Si3O10 and Li8Zn10Si7O28. Crystallization temperature was about 670°C, optimized sintering temperatures was about 810°C, vickers hardness increased from 550 to 898 with an increase of 60%, maximum bending force increased from 1468 N to 1736 N with an increase of 18%, fracture deflection increased from 0.54mm to 0.65mm with an increase of 20%, and have a good combining ability between coating and metal substrate.

Abstract: This paper mainly introduces three common adding ball methods,simply adding a kind of large balls has the advantages of simple principle,while will cause a slants much of large balls in mill seriously,so its technology aspect is not appropriate; according to the load characteristics and consumption adding balls,which is targeted,but this method is cumbersome and heavy workload,difficult in popularization and application;graphic method adding balls has its theoretical basis of the actual production and its operation is simple.The development direction of adding ball methods is mainly focus on strengthening the grinding targeted,reducing workload and the automatic control to avoid the artificial influence.

Abstract: By means of X-ray diffractometry (XRD) and transmission electron microscope (TEM), the micro-structure of 5 different Ni–B alloy coatings prepared by electroless plating with Potassium borohydride content ranging from 0.2 to approximately 1.4g/L was studied The influence of the KBH4 content in the coatings on their micro-structure was also investigated. It has been found that Ni–B alloy coatings showed amorphous sytuctue with XRD while with TEM it showed a combination of amorphous and nanocrystalline structure. It was further revealed that the amorphous structure increased with increasing KBH4 content, which means that Ni-B alloy coating prepared with increasing KBH4 content undergoes a transition process as follows: nanocrystalline → crystalline → amorphous structure. Results indicated that the micro-structure of Ni-B alloy coatings should be studied by both methods of XRD and TEM.

Abstract: Two different surface engineering technologies, plasma nitriding and titanium nitride (TiN) film deposition by closed-field unbalanced magnetron sputtering (CFUBMS), were used to improve the tribological properties of pure titanium. Surface characteristics were evaluated by microhardness tester, scanning electron microscopy(SEM), X-ray diffraction (XRD) and pin-on-disc tribotester. The influence of the two surface treatments on wear resistance of titanium was investigated. After plasma nitriding or TiN film deposition by CFUBMS, the microhardness of the surface increased approximately 3 to 5 times when compared with that of untreated pure titanium and the wear resistance was improved significantly. The wear resistance of TiN film deposited titanium specimens was higher than that of plasma nitrided ones.

Abstract: Widely used to improve the lifespan of tools, Physical Vapor Deposition (PVD) coating process yields hard coating film by creating high-energy beam of coating particles or plasma ions. The quality of the coat is largely depended on its evenness, which is achieved solely by the know-how and experience of coating companies. In dealing with a large, unfamiliar-shape workpiece, coating companies need a logical way to determine the optimal placement of the workpiece in the PVD oven. This work presents the improvement of placement angle optimization for a five-degrees-of-freedom jig fixture with self-rotation. The sensitivity of errors in the physical placement is found to be small.

Abstract: Hydrophilic/hydrophobic behavior on Ti foil surface prepared during anodization process was examined. The titanium foils were anodized in electrolyte contained 0.25wt% NH4F, 2.5vol% water and the ethylene glycol under direct voltage of 40V at room temperature for 3h. The anodized specimens were oscillated in ultrasonic clearer for 10 min or 30 min. The surface morphologies of the specimens during different stages of the process were observed by field-emission scanning electron microscopy (FESEM). The wettability of specimen surface was estimated by measuring contact angle (CA) of water droplets on specimen surface. The results show wetting angle on the surface of the Ti specimens after anodization process is at the range of 149° to 153°, indicating hydrophobic or even superhydrophobic property. CAs on the anodized specimens after oscillation in ultrasonic clearer is at the range of 25° to 42°, indicating the hydrophilic property. Hydrophilic/hydrophobic behavior on Ti foil surface during the process was explained by morphology on titanium surface.

Abstract: The mechanical alloying method process has been innovatively used to prepare Cu-Cr coating on the inner wall of steel pipe. The effect of the rotating speed on thickness, microhardness and friction coefficient of the Cu-Cr coating was investigated. The coating thickness was measured from all samples using optical microscope. The microhardness was analyzed by Digital Microhardness Tester. The friction coefficient was tested by high speed reciprocating friction testing machine. The results show that the coating thickness is 26, 29 and 31μm at the rotating speed of 200, 250 and 300 rpm. The microhardness of the Cu-Cr coating prepared at 200, 250 and 300 rpm are about 760, 780 and 830 Hv. The friction coefficient of the Cu-Cr coating prepared at 200 rpm are about 0.25, 0.40 and 0.38 at the frequencies of 3, 4 and 5 Hz. The friction coefficient of the Cu-Cr coating prepared at 250 rpm are about 0.30, 0.29 and 0.20 at the frequencies of 3, 4 and 5 Hz. The friction coefficient of the Cu-Cr coating prepared at 300 rpm are about 0.10, 0.13 and 0.09 at the frequencies of 3, 4 and 5 Hz.