oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Friction and Wear Properties of the Al2O3-TiC-TiN Composite Ceramic under Single Abrasive
单磨粒作用下Al2O3-TiC-TiN复合陶瓷的摩擦磨损特性

GUO Shaoyi,MAO Dongsheng,LI jian,MAO Zhiyuan,
郭绍义
,茅东升,郦剑,毛志远

无机材料学报 , 1997,
Abstract: With the help of an in-situ pin-disk sliding wear apparatus in scanning election microscopes (SEM), the friction and wear properties of the Al2O3-TiC-TiN advanced composite ceramic under single abrasive were studied. The results show that the friction behaviors of Al2O3-TiC-TiN have different characteristics in vacuum and air. At first the dominant wear mechanism is the microcutting and with the wear proceeding the brittle fracture becomes more and more important. The experiments also indicate that the relative hardness of the abrasive has a great effect on the wear rate of this material under three-body abrasion conditions.
Study of multilayer coatings of Ti/TiN/TiC produced by pulsed arc discharge
Restrepo, E.;Benavides, V.;Devia, A.;Olarte, S.;Arroyave, M.;Arango, Y.C.;
Brazilian Journal of Physics , 2004, DOI: 10.1590/S0103-97332004000800043
Abstract: this work presents a study of multilayered ti/tin/tic thin films obtained using a papvd (plasma assisted physical vapor deposition) system by pulsed-arc discharge. for this purpose, a titanium target and a stainless steel substrate were used, placed on the cathode and on the anode, respectively, inside a vacuum chamber. to grow these films, different gases and concentrations were required. ti is obtained with argon gas, tin with nitrogen, and tic with methane, at 2.5 mbar and 5 mm distance between electrodes. by means of x ray diffraction (xrd), the phases present in the film were determined, observing (111), (200), and (100) orientations for both, tin and tic. also, by employing xrd techniques, titanium atoms distance (dta) was calculated at the interface of tin and tic, in order to study the crystallographic match. energy dispersive spectroscopy (eds) was employed in order to carry out elemental analyses in the materials. these analyses were obtained for 12 kev and 30 kev, observing the effects in the results. taking advantage of defects generated during the growth of the multilayer, chemical composition maps were carried out, probing the combination of ti and n in one layer and ti and c in the other layer. scanning electron microscopy (sem) technique allowed observing the presence of the multilayer, as well as the measurement of the thicknesses of each layer, which are in the order of nanometers.
CVD TiC―TiN多层涂层与TiC及TiN单层涂层摩擦学性能的比较  [PDF]
张人佶
摩擦学学报 , 1992,
Abstract: 作者住Bernex公司计算机控制的CVD设备上制备了TiC-TiN多层涂层与TiC及TiN单层涂层,利用自制的MT-1型真空摩擦磨损试验机系统地考察了三者的摩擦磨损性能,并对磨痕进行了扫描电镜显微观察和X-射线能谱成分分析。结果表明,无论是在真空中还是在大气中,也无沦是在于摩擦还是在油润滑条件下,TiC―TiN多层涂层均具有较好的摩擦学性能。文章还根据这种涂层所特有的多层磨损机制和过渡层润滑机制,对其良好的摩擦磨损性能进行了解释。
Measurement of Bonding Strength of Magnetic Sputtered TiN Coatings by Indentation Method
磁控溅射TiN界面结合强度的压痕法测试

WEI Xi cheng,LI Jian,YUAN Cheng qing,
韦习成
,李健

摩擦学学报 , 2000,
Abstract: The modified formula for calculation of elasto plastic Hertzian contact stress was established. The formula was adopted to calculate the bonding strength of magnetic sputtered TiN coatings and compared with the experimental one. At the same time, the factors affecting the bonding strength of the coatings are discussed as well. As the results, the bonding strength of magnetic sputtered TiN coatings is greatly affected by the substrate surface roughness. In comparison with the other methods for measurement of the bonding strength of coatings, the current method has been found to be applicable and convenient for the bonding strength evaluation of coatings.
In uence of substrate temperature on the microstructure of TiN/TiC Influencia de la temperatura del sustrato en la microestructura de recubrimientos de TiN/TiC  [cached]
Diana Marcela Devia,Fernando Mesa,Pedro José Arango
Ingeniería y Ciencia , 2011,
Abstract: TiN/TiC bilayers were deposited using Plasma Assisted Physical Vapor Deposition technique PAPVD)-Pulsed Arc, varying the substrate temperature ina range of 100-120 C, with intervals of 5 C. Coatings were analyzed through XPS and XRD. From signal processing narrow spectrum of XPS and the XRD patterns, was determined the formation of TiN (Titanium Nitride), TiC (Titanium Carbide) and TiCN (Titanium Carbide Nitride) compounds in the crystallographic. Las bicapas de TiN/TiC se depositaron utilizando la técnica de deposición en fase vapor asistido por plasma (PAPVD)-Arco Pulsado, variando la temperatura del sustrato en un rango de 100-120±C, con intervalos de 5±C. Los recubrimientos se analizaron por medio de XPS y XRD. A partir del tratamiento de las se ales de los espectros angostos de XPS y los patrones de XRD, se determino la formación de los compuestos TiN (Nitruro de Titanio), TiC (Carburo de Titanio) y TiCN (carbonitruro de titanio) en la fase cristalográfica fm-3m correspondiente a las fases FCC de estos compuestos sintetizados.
Influencia de la temperatura del sustrato en la microestructura de recubrimientos de TiN/TiC
Devia,D. M; Mesa,F; Arango,P. J;
Ingeniería y Ciencia , 2011,
Abstract: tin/tic bilayers were deposited using plasma assisted physical vapor deposition technique papvd)-pulsed arc, varying the substrate temperature in a range of 100-120 °c, with intervals of 5 °c. coatings were analyzed through xps and xrd. from signal processing narrow spectrum of xps and the xrd patterns, was determined the formation of tin (titanium nitride), tic (titanium carbide) and ticn (titanium carbide nitride) compounds in the crystallographic.
Interfacial Bonding Strength of TiN Film Coated on Si3N4 Ceramic Substrate
Interracial Bonding Strength of TiN Film Coated on Si3N4 Ceramic Substrate

Dejun KONG,Yongkang ZHANG,Zhigang CHEN,Jinzhong LU,
Dejun
,KONG,Yongkang,ZHANG,Zhigang,CHEN,Jinzhong,LU

材料科学技术学报 , 2007,
Abstract: The fraction of TiN/Si3N4 in the cross section was observed with scanning electric microscope (SEM), and residual stresses of TiN coated on the surface of Si3N4 ceramic were measured with X-ray diffraction (XRD). The hardness of TiN film was measured, and bonding strength of TiN film coated on Si3N4 substrate was measured by scratching method. The formed mechanism of residual stress and the failure mechanism of the bonding interface in the film were analyzed, and the adhesion mechanism of TiN film was investigated preliminarily. The results show that residual stresses of TiN film are all behaved as compressive stress, and TiN film is represented smoothly with brittle fracture, which is closely bonded with Si3N4 substrate. TiN film has high hardness and bonding strength of about 500 MPa, which could satisfy usage requests of the surface of cutting Si3N4 ceramic.
XPS STRUCTURE ANALYSIS OF TiN/TiC BILAYERS PRODUCED BY PULSED VACUUM ARC DISCHARGE
RESTREPO PARRA,ELISABETH; ARANGO ARANGO,PEDRO JOSE; BENAVIDES PALACIO,VICENTE JAVIER;
DYNA , 2010,
Abstract: tin/tic bilayers were grown on 304 stainless steel substrates using physical vapour deposition assisted by pulsed arc plasma system (papvd) at two substrate temperatures (50o c and 150o c). x ray photoelectron spectroscopy (xps) was used to analyze the chemical composition by observing the behaviour of the ti2p, n1s and c1s lines. binding energy analysis confirmed tin and tic formation. the c1s and ti2p peaks shifted with increasing xps sputtering time, thus revealing hydrocarbides contamination. furthermore, depth profiles of the tin/tic bilayers showed that the films grown at a substrate temperature of 150o c had a thicker tin layer than the samples grown at 50o c. nitrogen had diffused into the tic layer and carbon into the tin layer in both films.
Electronic structure and chemical bonding of nc-TiC/a-C nanocomposites  [PDF]
Martin Magnuson,Erik Lewin,Lars Hultman,Ulf Jansson
Physics , 2011, DOI: 10.1103/PhysRevB.80.235108
Abstract: The electronic structure of nanocrystalline (nc-) TiC/amorphous C nanocomposites has been investigated by soft x-ray absorption and emission spectroscopy. The measured spectra at the Ti 2p and C 1s thresholds of the nanocomposites are compared to those of Ti metal and amorphous C. The corresponding intensities of the electronic states for the valence and conduction bands in the nanocomposites are shown to strongly depend on the TiC carbide grain size. An increased charge-transfer between the Ti 3d-eg states and the C 2p states has been identified as the grain size decreases, causing an increased ionicity of the TiC nanocrystallites. It is suggested that the charge-transfer occurs at the interface between the nanocrystalline TiC and the amorphous C matrix and represents an interface bonding which may be essential for the understanding of the properties of nc-TiC/amorphous C and similar nanocomposites.
硬质合金TiC/Al2O3/TiN复合涂层的热应力分析  [PDF]
谈峰,黄自谦
湖南农业大学学报(自然科学版) , 2008,
Abstract: 采用有限元法分析了硬质合金TiC/Al2O3/TiN复合涂层的残余热应力,结果表明:iC/Al2O3/TiN复合涂层温度从800 ℃下降到0 ℃时,等效应力在TiN层内应力最高,为3 103 MPa;三轴应力在TiN涂层内以拉应力为主,最大拉应力为1 844 MPa,在硬质合金基体内以压应力为主,其最大压应力为-1 194 MPa;TiC层内拉应力比TiN层内略小,l2O3层为一应力低谷,夹在2个高峰之间;在刀片边缘应力相对较小,在刀片表面的中心应力相对集中.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.