The Improved Friction Properties of Bonded MoS2 Films by MAO Treating of Al Substrate

2013 ◽  
Vol 275-277 ◽  
pp. 1911-1914 ◽  
Author(s):  
Han Jun Hu ◽  
Hui Zhou ◽  
Yu Gang Zheng ◽  
Kai Feng Zhang ◽  
Zhi Hua Wan
Keyword(s):  
Tribological Properties ◽  
Solid Lubricants ◽  
Ceramic Coatings ◽  
Test System ◽  
Test Method ◽  
Test Results ◽  
Specimen Test ◽  
Micro Arc Oxidation ◽  
A New Technique ◽  
Porous Microstructures

The bonded MoS2 films are widely used as solid lubricants in aerospace mechanisms due to their excellent tribological properties. Traditionally, the MoS2 was directly bonded on the Al substrate that was only treated by the technique named of sandblast. For improving the tribological properties of MoS2 films, micro arc oxidation (MAO) instead of sandblast was introduced as a new technique for treating of Al substrate. In this article, the tribological properties of MoS2 films which were bonded on different surface of Al substrate as mentioned above were discussed, respectively. It was concluded from the test results that the MoS2 films bonded on substrate treated by MAO have better tribological properties than those samples treated by sandblast. The endurance life against abrasion of the former is as high as twenty times of the latter by the stand test method of ball on disk using the UMT Multi-Specimen Test System. This test results could be illustrated by the following reasons. The first is the porous microstructures of MAO ceramic coatings on the Al substrate. The coatings have numerous pits to be good at increasing the binding force with the MoS2 films, and the pits can also provide a MoS2 lubricants reservoir during processes of friction. Both of them improved the MoS2 film’s ability of wear-protective. The second is that hardness of the coating is higher than the Al, and this ensures well wearing resistance, especially in practical application to big load-supporting moving parts, such as bearing, gear, etc…

The Research of IC Test Based on LTX-77 Test System

2014 ◽  
Vol 496-500 ◽  
pp. 1176-1179
Author(s):  
Li Tan ◽  
Yu Fang
Keyword(s):  
Test Object ◽  
Test System ◽  
Test Method ◽  
Test Results ◽  
Analog Ic ◽  
Test Platform ◽  
Logic Functions ◽  
Actual Test ◽  
Ic Test

LTX-77 test system is a large IC test system that is used for various kinds of analog IC, digital IC and analog digital mixed IC. It can be used to test DC parameters, AC parameters and logic functions. In the paper, the IC test platform is LTX-77 test system. IC ADC0804 was tested as the test object. The test method of IC is described in the view of actual test. The test results show that the test system is convenient and accurate, which has important practical value for IC manufacturers and users.

A Test Method of CCD Photoelectric Parameters

2011 ◽  
Vol 317-319 ◽  
pp. 1119-1122
Author(s):  
Nao Sheng Qiao ◽  
Chun Mei Yao ◽  
Yan Li ◽  
Xue Juan Chen
Keyword(s):  
Output Voltage ◽  
Measurement Method ◽  
Test System ◽  
Test Method ◽  
Test Results ◽  
The Real ◽  
Real Relation ◽  
Comparison Of The Results ◽  
The Ideal

Until now, no effective method to measure CCD photoelectric parameters. To solve the problem, a novel measurement method that combines hardware with software is proposed, and it can let hardware and software collaborate with each other to finish assignment together. Firstly, the ideal relation between output voltage and input exposure quantity of CCD is given. Secondly, some main photoelectric parameters of CCD are elaborated. Then based on the principle, test system of CCD photoelectric parameters that combines hardware with software is designed. Lastly, the real relation between output voltage and input exposure quantity of CCD is given, and the test results of experiment of each photoelectric parameter are obtained according to the relation. What’s more, analysis and comparison of the results of the experiment are given in this paper. The method is reliable and the precision is high in the experiment.

Tribological Studies of Steels Using the Abrasive Wheel

2009 ◽  
Vol 83-86 ◽  
pp. 545-552 ◽  
Author(s):  
Majid Abbasi ◽  
S. Kheirandish ◽  
Y. Kharrazi ◽  
J. Hejazi
Keyword(s):  
Wear Resistance ◽  
Wear Behavior ◽  
Soft Materials ◽  
Test Method ◽  
High Wear Resistance ◽  
Test Results ◽  
Abrasive Wheel ◽  
Different Types ◽  
Pin On Disc ◽  
A New Technique

The abrasive wear behaviors of different types of steels were evaluated using the abrasive wheel as a new technique in the pin on disc method. It is shown that the abrasive studies using this test method is acceptable for high wear resistance metals such as Hadfield steels, while it is not proper for soft materials such as mild steel. The test results on the different materials also show that initial hardness of materials cannot merely determine the wear resistance. However, microstructural changes during the sliding have significant effect on the wear behavior and must be included.

Effects of Chemical Composition on the Impact Properties of A533B Steels

2010 ◽  
Vol 654-656 ◽  
pp. 2895-2898
Author(s):  
Byung Jun Kim ◽  
Ryuta Kasada ◽  
Akihiko Kimura
Keyword(s):  
Chemical Composition ◽  
Energy Use ◽  
Test Method ◽  
Test Results ◽  
Shelf Energy ◽  
Intergranular Cracking ◽  
Test Technique ◽  
Physical Mechanisms ◽  
Specimen Test ◽  
The Impact

In order to estimate the long life integrity of vessel steels with considering various material compositions and irradiation conditions, it is necessary to understand physical mechanisms of the degradation of mechanical properties. In this research, chemical composition effects were investigated for Reactor Pressure Vessel Steels (RPVS) to apply small specimen test technique to surveillance test method. All specimens used in this study were machined from the A533B plate material, which are standard, low Mn, high Cu, high P, and high Cu and high P steels. Tensile strength is increased by phosphorous and copper additions. Charpy tests were carried out at temperature from 73 K to 473 K. The ductile to brittle transition temperature (DBTT) is shifted to higher temperatures with phosphorus additions accompanied by the reduction of the upper shelf energy (USE). The fracture mode of P-added A533B steels at temperatures in the lower shelf energy (LSE) region is intergranular cracking. Test results were discussed in view of the differences on elements of Cu, Mn and P.

Determination of the Probabilistic Fatigue S-N Curves Including Super-Long Life Regime for a Railway Axle Steel

2008 ◽  
Vol 44-46 ◽  
pp. 57-64 ◽  
Author(s):  
Yong Xiang Zhao ◽  
Bing Yang ◽  
Ming Fei Feng
Keyword(s):  
High Frequency ◽  
Life Prediction ◽  
Test System ◽  
Test Results ◽  
Railway Axle ◽  
Basic Work ◽  
Specimen Test ◽  
Ultrasonic Fatigue ◽  
Long Life

The structures of railway vehicles are required to service in super-long life regime. Determination of the probabilistic S-N curves including the regime should be a basic work to realize the real fatigue life prediction and reliability assessment. Based on the test results of Chinese railway LZ50 axle carbon steel, a statistical extrapolating method is proposed to determine the curves by applying the conventional test data in mid-long life regime. Some phenomena, i.e. the response of “fatigue limit”, a great of heat affecting using the high frequency ultrasonic fatigue test system, and the non-conservative test results using the conventional frequency tiny multi-specimen test system (machine C), are firstly mentioned in the existent super-long life researches. The too much conservative offers are also noted by the determinations of existent codes. To address the variable amplitude loads in production, the present method extrapolates continuously the curves from the mid- to super-long life regimes under the statistical controls of conventional fatigue limits. The practice for the present material indicates that the curves can well reflect the scattered data not only in mid-long life regime but also in super-long life regime. The non-conservative test results using machine C are also safely included by the curves.

Joint Development of a Package-Level Thermal Interface Material Test System

2009 ◽  
Author(s):  
Yanshu Susan Chen ◽  
Stanley Pecavar ◽  
Vadim Gektin
Keyword(s):  
Material Selection ◽  
Test System ◽  
Thermal Design ◽  
Test Method ◽  
Thermal Interface Material ◽  
Test Results ◽  
Performance Measurements ◽  
Thermal Interface ◽  
Application Performance ◽  
Successful Model

As the microelectronics industry continues to trend towards smaller, lighter, and higher power devices, thermal management is becoming more important than ever. Thermal interface materials (TIMs) play a crucial role in removing heat from both bare die and lidded packages. A serious challenge the industry has been facing is the lack of an agreed upon test standard that is specifically tailored for TIM thermal performance measurements between TIM suppliers and OEM customers. ASTM D 5470 is not necessarily the best gauge for TIMs in-application performance. Data generated by the OEM often differ from TIM supplier’s results, and thus can not be used confidently in thermal design. An OEM’s material selection can also prove to be unreliable when comparing data from different TIM suppliers. This paper presents a successful model that an OEM customer (Sun Microsystems) and a TIM supplier (LORD Corporation) have established for characterization of TIMs, and illustrates a package-level thermal test vehicle (TTV) setup for junction-to-sink thermal resistance measurements. Also presented are test results for several TIMs and repeatability of the test method. The effects of a few influencing factors, such as pressure load and TIM staging time, on the test results are also discussed.

Influence of Coating Deposition Parameters on the Mechanical and Tribological Properties of TiCN Coatings

2017 ◽  
Vol 49 ◽  
pp. 98-107 ◽  
Author(s):  
Nikolay Petkov ◽  
Totka Bakalova ◽  
Hristo Bahchedzhiev ◽  
Pavel Kejzlar ◽  
Petr Louda
Keyword(s):  
Tribological Properties ◽  
Energy Dispersive Spectrometer ◽  
Test System ◽  
Coating Deposition ◽  
Mechanical And Tribological Properties ◽  
Deposition Parameters ◽  
Specimen Test ◽  
Cathodic Arc Evaporation ◽  
Arc Evaporation ◽  
Cathodic Arc

This paper is a continuation of our previous work. The article presents an investigation of the influence of coating deposition parameters, in particular a variation with 50% of both cathodic arc current and bias voltage, on the mechanical and tribological properties of TiCN coatings deposited by the cathodic arc evaporation of metals at a constant gas ratio. The thicknesses of the coatings are measured by the Calotest method using a 30-mm hard steel ball. The determined values are in the range of 734 – 1534 nm. Surface morphology and chemical composition are estimated by a Scanning Electron Microscope (SEM) and an Energy Dispersive Spectrometer (EDS) of SEM. The determined values of nanohardness are in the range of 10 - 23 GPa and adhesion values are in the range of 28 - 70 N. Tribology of the TiCN coatings is investigated with three different load forces (3N, 5N and 8N) by the CETR UMI Multi-Specimen Test System from Bruker with an Si3N4 ball counter-body. The friction coefficient is measured in the range of 0.19 - 0.23. Coating wear and wear of the counter-body are calculated, according to the standard EN1071-13:2010, wherein the values of the latter are in the range of (2.5 - 30) x 10-6 mm3.

Tribological Properties of PVD CrAlN Coating Tools

2013 ◽  
Vol 706-708 ◽  
pp. 375-378
Author(s):  
Ai Hua Liu ◽  
Jian Xin Deng ◽  
Peng Zhang
Keyword(s):  
Tribological Properties ◽  
High Speed ◽  
Vapour Deposition ◽  
Test System ◽  
Test Results ◽  
Wear Properties ◽  
Low Load ◽  
Cathodic Arc ◽  
Wear Tests ◽  
Ball On Disc

The paper reports the tribological properties of the CrAlN coating tools at different speeds and loads. The coating was deposited on cemented carbide by cathodic arc physical vapour deposition technique. Ball-on-disc wear tests were performed on the CETR UMT-2 test system against SiC balls. The coating character and test results were obtained through SEM, XRD and Wyko surface profilometer. The results are as follows: The value of friction of coefficients decreased and depth of wear tracks became sallower as speeds increased and the coating presented adhesion phenomenon under low load. CrAlN coating showed excellent anti-wear properties at high speed and low load, and was more suitable for these similar working conditions.

Study of Tribological Properties of Micro-Arc Oxidation Ceramic Coatings Prepared with Different Impulse Frequency on Aluminum Alloy

2012 ◽  
Vol 538-541 ◽  
pp. 368-372 ◽  
Author(s):  
Yu Gang Zheng ◽  
Hui Zhou ◽  
Han Jun Hu ◽  
Kai Feng Zhang ◽  
Zhi Hua Wang ◽  
...  
Keyword(s):  
Tribological Properties ◽  
Source Parameters ◽  
Ceramic Coatings ◽  
Al Alloy ◽  
Impulse Frequency ◽  
Hardness Tester ◽  
Friction Tester ◽  
Micro Arc Oxidation ◽  
Disk Friction ◽  
Electrical Source

The ceramic coatings, on the substrate of LY12 Al alloy, were prepared by micro-arc oxidation (MAO) technique with different electrical source parameters. The microstructure and tribological properties of the resulting micro-arc oxidation ceramic coatings(MAOC) were tested and analyzed by Nano-scratch tester, Micro-hardness tester and ball-on-disk friction tester etc. The results indicate that the thickness, roughness, micropore sizes and wear-resistance of MAOC increase with impulse frequency decreasing, however, the porosity is correspondingly reduced.

scholarly journals The reliability acceleration test method of special vehicle transfer box

2021 ◽  
Vol 243 ◽  
pp. 02006
Author(s):  
Rui Liu ◽  
Wanying Liu ◽  
Yihui Zhao
Keyword(s):  
Product Development ◽  
New Product Development ◽  
New Product ◽  
Test System ◽  
Test Method ◽  
Reliability Test ◽  
Test Results ◽  
Development Cycle ◽  
Special Vehicle ◽  
Acceleration Test

This paper introduces the principle of the simulation load acceleration test system, the principle of accelerating test, and discusses the technology and method of the reliability acceleration test of the box.The accelerated test results show that the simulation load acceleration test can meet the reliability test of the unit, which can shorten the development cycle and have important production practical value for research and new product development.

Sign in / Sign up

Export Citation Format

Share Document