Advanced Materials Research Vols. 712-715

Abstract: The paper presents the results of the methodology for improving of cutting tools performance based on modifying the surface properties of the tool material in the formation of wear-resistant complexes, substantially modifying its properties. Argued and offers a three-component (for carbide tools) and four-component (for HSS tools) system for modifying the surface properties, improves the tool material. This paper describes a method and results of research to note the substantial increase of efficiency of HSS drills and milling and turning tools made of carbide in the processing of structural steel and hard-to-cut superalloy.

Abstract: The technique of system parametrization of a microrelief of surfaces plasma electrolytic oxidation coverings on the titan is offered. Correlation of topology of surfaces of oxidic coverings with their thickness and magnetic properties is established.

Abstract: The FEM model of lubricating oil film was built with mill oil-film bearing as the research target, the analysis system of magnetic-fluid lubricating oil film for oil-film bearing was developed. APDL and CEL languages were applied to compile the inner analytical programs, and the combination of VB, ANSYS Mechanical with ANSYS CFX was perfectly realized. Through the numerical simulation of magnetic-fluid lubricating film, the load-carrying performances of oil-film bearing with magnetic-fluid lubrication were analyzed, and the relationship among magnetic field intensity with oil-film pressure and temperature was quantitatively calculated. The numerical results have shown that the magnetic-fluid lubrication has obvious influences on oil-film pressure when magnetic field was applied on oil-film bearing, the lubricating viscosity increases with the magnetic-fluid intensity, and the oil-film pressure and temperature also increase with magnetic-field intensity. However, the increasing increment of oil-film temperature is far lower than that of oil-film pressure. The above conclusions prove that magnetic fluid with proper magnetic field can effectively improve the load-carrying capacity of lubricating oil film and enhances the stability of oil-film pressure. Moreover, the adjustable intelligent oil-film pressure with magnetic field is deduced to be feasible.

Abstract: This article introduces the biology non-smoothness, which generally exists in the natural environments. The various superficial shape of the biological living organism, regardless if it is on the land, in the sea, or in the air, often has the non-smooth surface, which has evolved for adapting to the different living conditions. The non-smooth surface has the characters of reducing resistance, anti-adherence, and anti-friction. These characteristics have been successfully applied to reduce resistance on airplane surface, reduce sticks on plough surface and wear the engine piston surface. The article also studied the bionic non-smooth drilling bit, applying the bionic non-smooth theory to the design of diamond bit, the JBD-75S bionic non-smooth diamond bit was developed. Field trial proved that bionic bit was superior to conventional bit both in the drilling effectiveness and in lifetime.

Abstract: This paper presents the study of making peacock blue glaze surface by laser processing. The factors that may affect the quality of the glazed surface, especially the main laser processing parameters, were discussed. The structures and phase transitions of the glaze clad by laser were studied by X-ray diffraction, scanning electron microscopy and metallographic microscope. The color change and thermal stability of the glaze were tested. The results showed that the glazed surface clad by laser with a laser power of 25 W presented good visual characteristics. The color change of these glazed surfaces was inconspicuous with the increase in scanning speed. Several types of microcrystalline were also found in the glazed surface clad with a laser power of 25 W when the scanning speed was 10 mm/min. The glazed surface and the clay body were bonded tightly. The thermal stability of the glazed surfaces with good visual characteristics was also good.

Abstract: A semi-interpenetrating polymer network was fabricated from SMPU (Shape-Memory Polyureathan and PNIPAM (poly (N-isopropylacrylamide)) with the method of in-situ crosslinking polymerization. The temperature-sensitivity of the semi-IPN films was investigated and discussed. The morphology was achieved by extracting the SMPU phase. The influence of PNIPAM phase to the phase transition behavior of SMPU was studied with DSC, the results of which showing that the phase transition temperature is increased by PNIPAM. The introduction of PNIPAM also endows the semi-IPN films with a temperature-sensitive surface hydrophilicity, which was proved by water contact angle measurement at different temperatures. Finally, the water vapor permeability evaluation reveals the temperature-sensitive transportation property of the semi-IPN films, which is formed by the swelling and shrinking of PNIPAM phase according to the environmental temperature. These results shows that the semi-IPN material is a good candidate for the fabrication of intelligent breathable garments.

Abstract: In-situ synthesized WC particles reinforced Fe-based composite coating was prepared by argon arc cladding on Q235 with mixture of tungsten powders, graphite and iron powders mainly. Microstructures of coating were investigated using SEM, EDS and XRD. Micro-hardness and wear resistance were also studied. The result showed that the main phases of coating were WC, Fe₃W₃C, martensite and residual austenite. The WC particles were well distributed in matrix and appeared significant growth and reunion from bottom to top of coating. Hardness of the coating ranged between HV_0.2 1102.2 to 1863.5. The wear loss of Q235 steel was 37.2 times than that of the coating.

Abstract: The effects of six factors, affecting during the acid zinc plating process as its technological conditions, on the thickness of the resulting zinc coating has been examined. In order to control the quality of the resulting zinc coating deposited on the surface alloy EN 355 at a constant current density of 5 [Adm^-2], the mathematical model predicting the thickness of deposited coating was developed using Design of Experiments (DoE) method. The obtained mathematical model describes the resulting deposited layer of zinc coating in dependence on the factor-level changes and combinations with the reliability of 58.75%.

Abstract: The convex structure on tree frogs foot pats provide huge adsorption force, we can extract this facture of tree frogs foot pats, and apply on the surface of belt conveyor drum encapsulation in order to increase friction between drum and conveyor belt. But the environment underground is complex. There is always has coal particle and water on the frictional contact surface. The friction performance test was done by MMW-1A universal friction and wear tester in order to verify the friction coefficient of bionic surface under different conditions. At last, we figure out that water or coal particle has little influence on bionic friction surface, but has huge influence on common surface.

Abstract: The paper studies the influence of properties of a tool made of mixed ceramic by applying modifying with nanoscale multi-layered coatings on machinability of hardened tool steel XVG. The paper also examines the influence of cutting speed on wear resistance of mixed ceramic with nanoscale multilayered coatings. The mathematical models that found out the dependence of tool life of a ceramic tool with coating from cutting speed were developed.