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Calcium carbonate nanopowder is an important engineering material used for various painting and polymer-based composite additive and filler. The hydrophobic modification on surface of calcium carbonate nanopowder was performed by using three silane coupling agents: i.e. 3-Aminopropyl triethoxysilane (APTES), 3-mercapto-propyl triethoxysilane (MPTES) and 3-ATRP trimethoxysilane (KH570). The Fourier...
Based on the laboratory experiments, the drawing galling behavior in macro-scale is investigated in the square cup drawing of a high tensile strength steel SPFC590 in semi-dry condition. When using the non-coated dies (cold alloy tool steel (SKD11, SLD) and austempered ductile irons (ADI)) in semi-dry, the macro-scale galling can clearly observed on die and drawn cup surface after a few drawing cycles...
As a kind of middle-temperature PCM (Phase Change Material), paraffin is perfect except for its poor thermal conductivity. Nano-aluminum, which has high thermal conductivity and good compatibility, was added into paraffin to improve its thermal conductivity. Surface modified technology was adopted and dispersant was used to prepare uniform and stable organic phase-change nano-fluid of paraffin and...
In recent years, researchers have focused on the development of degradable implants. Magnesium is considered to be a potential implant material for biodegradable orthopaedic applications because of its inherent beneficial properties including superior biocompatibility, biodegrability and proper mechanical properties. Selective Laser Melting (SLM) is a laser aided layer by layer technique which enables...
Fine blanking process on plane blank holder utilizes three tooling elements: a punch, a plane blank holder and an ejector to generate a highly compressive stress state and pure shearing forces to constraint the deformation of sheet metal within the narrow blanking clearance zone. Numerical simulation of fine blanking for steel 20 was performed using commercial FEM software DEFORM, and element deletion...
The aim of the present work is to investigate on the mechanical and micro structural properties of dissimilar 2024 and 7075 aluminium plates joined by friction stir welding (FSW). The two plates, aligned with perpendicular longitudinal directions, have been successfully welded; successively, the welded plates have been tested under tension at room temperature in order to analyse the mechanical response...
Throughout the globe lot of research works are going on in order to improve the surface wear resistance of the different industrial materials. For that reason the surface coating techniques become popular. The detonation gun (d-gun) spraying is one of the most advanced thermal spray variants for depositing high quality wear resistant coatings. Of all the ceramic materials that can be D-gun sprayed,...
The auto semi-axle is the wheel direct driven part and important part of torque transmission, which is with wide variety and a great amount. In this paper, with taking the BJ-130 light semi-axle as example, the new characteristics of rotary forging process, the DW99-160 rotary forging machine and its working principle, blank forming of semi-axle, calculation of forging force and the selection of machine,...
In this study, a high-capacity electric double layer capacitor (EDLC) was targeted, and an influence on a capacitance by a surface functional group of Ketjenblack (KB) powder as a conducting material of a polarized electrode was examined. Existence of an oxygen functional group on a surface of a carbon electrode in EDLC is related to a capacitance increasing with faraday reaction and improvement of...
EDF studies the maintenance of its main nuclear components. Until now, maintenance strategies need to operate in air, after draining water from the component. A great benefit is identified to perform its operation underwater. This paper deals with the study of one of the main processes used for maintenance, milling, implemented underwater. The study demonstrated the feasibility of underwater robotized...
The way in which surface changes are transduced into a variation of an electrical parameter (often electrical resistance) depends on the surface oxidation level, material morphology its semiconductor behaviour, etc. Therefore, if one wants to understand more about the way in which gas-surface interactions affect the gas sensing properties of material, complex phenomenological and spectroscopic investigations...
Extracted data from a tensile test applied on a compact tension specimen are not sufficient to have an accurate statement about fracture mechanical properties of materials. Verification of these data using finite element analysis cannot be directly validated on the crack tip due to its singularity and material nonhomogeneity. This paper presents implementation of digital image correlation (DIC) algorithms...
Technological improvements have led to the development of low resistivity materials with higher surface which are capable of storing more energy in the form of electrical charge. These developments as well as a better theoretical understanding of the process of charge transfer, a process that appears in double layer type materials, led to the development of capacitors with high capacitance, known...
It has analyzed reasons of high-speed dry cutting technology production and application in gear processing. It enumerates the comparisons between dry cutting technology and traditional processing. It has the merits of space and energy consuming, unit production cost, occupation area, processing time and so on. The experiment shows that the processing time in dry cutting is 25 percent of traditional...
Sapphire crystal material has a good transmittance and its infrared transmittance hardly changes with temperature. Therefore it is widely used in lasers, infrared technology, semiconductors, measuring instruments, defense and aerospace and many other areas. But there still have the problems of low productivity, easy scratching the surface and the surface quality of instability and others on the grinding...
In this study, we synthesized titania nanotubes (TNTs) by a hydrothermal process from commercial P25, and prepared Pt/TNT catalysts by impregnation. To evaluate their catalytic activity, we reacted the TNTs and Pt/TNTs photocatalytically with carbon monoxide (CO). These investigations indicated that the efficient removal of CO could be attributed to the high dispersion of Pt on the TNT (123.4 m2/g,...
By using orthogonal experiment design and the software Statistics Package for Social Science (in short, SPSS), in this paper, the effect of all the factors (dosage, concentration, time, mix ration of modification agent and temperature) is studied on the sedimentation volume of TiO2 powder, and the experiment data is processed through direct observation and analysis of variance. Moreover, based on...
Since the beginning of the 20th century, surface flashover phenomena have been investigated from a viewpoint of scientific interest. The surface flashover can cause serious accident and limit the development of the electric power and high voltage equipment. The measurement of surface charge is important to understand the discharge of insulating materials and may help to find new ways to improve the...
In order to restrain surface breakdown of dielectric window in HPM (High Power Microwave) devices, experimental research of surface breakdown suppression technology for PTFE is performed under an S-band HPM experimental system in this paper. Different suppression technologies are employed, such as surface polishing, surface notching and surface coating technologies, etc. Experimental results show...
As we know, before flashover across an insulator surface under high electric field in vacuum, there are charging phenomena occurring on the insulator surface, which significantly affect the developing process of flashover. Based on the secondary electron emission avalanche (SEEA) model, and by using the Monte Carlo method, a two-dimensional analysis of surface charge density on cylindrical and conical...
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