Papers by Keyword: Wear Testing

Paper TitlePage

Authors: Zi Kai Hua, Yong Wei Fan
Abstract: Wear has been the primary failure mode affecting the long-term performance of orthopaedic implants. The tribological evaluation of orthopaedic biomaterials in vitro is regarded as an essential material characterization before implantation. In this paper, a new biotribometer of pin-on-disk type, the Ortho-POD, was designed and built for the biotribological tests of orthopaedic biomaterials. The primary goal of developing this Ortho-POD is to simulate and predict the wear properties of orthopaedic biomaterials in clinical application, especially in the form of hip, knee and spine prostheses. This 6-station Ortho-POD, including a pin guiding module, a motion module, a framework module and a loading module, provides multidirectional slide track shapes and variable load via a computer-controlled programmer. A frequency controller and heating system were assembled in the Ortho-POD so as to offer a wide range of testing conditions. Keywords-biotribology; wear; orthopaedic biomaterial; pin on disk; wear testing
Authors: Alain Kusmoko, A. Crosky
Abstract: This study was undertaken to evaluate the likely effect on the wear rate of changing the pinion material in a rack and pinion steering box from carburised SAE-AISI grade 8617 H steel to induction hardened SAE-AISI grade 4140 steel of the same hardness. Accordingly, pin on disc wear tests were conducted using carburised 8617 H pins and through hardened 4140 pins. The surface hardness of the pins was approximately 60 HRC for both materials. The discs were made of SAE-AISI grade 1040 steel through hardened to a hardness of 45 HRC. The results showed that both the pins and the discs wore more rapidly when the tests were carried out with 4140 pins. The study indicates that the wear rate would be increased on both the rack and the pinion if the pinion material were changed from case hardened 8617 H to induction hardened 4140.
Authors: Xing Dong Yuan, Bin Xu, Xiao Jie Yang, Hai Long Ma
Abstract: The friction and wear properties of Polytetrafluoroethylene (PTFE) coatings before and after gamma irradiation were studied under vacuum conditions. Experimental results indicated that the friction and wear properties of PTFE coatings were improved by gamma irradiation. Results showed that the wear process of PTFE coatings before and after gamma irradiation consists of three stages. The steps for the irradiated PTFE are slightly longer than that for the non-irradiated samples. The friction coefficient of irradiated PTFE coatings reduces slightly compared to that of the non-irradiated samples. The friction coefficients of the PTFE coatings before and after gamma irradiation first increase with the increase of sliding velocity and then decrease with the increase of sliding velocity, and The friction coefficient of PTFE coatings before and after gamma irradiation decreases with the increase of load. The wear of irradiated PTFE coatings is slightly lower than that of non-irradiated PTFE coatings. The wear of PTFE coatings before and after gamma irradiation first decreases with the increase of sliding speed and then increases as the sliding speed increases. The wear of PTFE coatings first decreases with the increase of load and then increases with the increase of load. Scanning electron microscope (SEM) was utilized to investigate the worn surfaces.
Authors: Guo Dong Cui, Han Bing Zhang, Tian Bo Jiang, Shang Guang Yang
Abstract: In the present investigation, 45CrMoV alloy steel was gas oxynitrocarburized at 530°C, 550°C and 570°C for 1h by applying a low-temperature gas multi-elements penetrating system. Microstructure, surface, composition, case depth, microhardness, wears and corrosion resistance were analyzed. The properties of samples treated at 570°C are optimum.
Authors: Han Jun Hu, Hui Zhou, Yu Gang Zheng, Kai Feng Zhang, Zhi Hua Wan, Shi Ning Gou, Jin Long Wu
Abstract: A type of PTFE/MoS2/glass fiber composite has been used as bearing cage material. To study the friction properties, the tests have been performed under various parameters on block-on-ring. The experimental results were as follows: Wear rate of the polymer composites was dramatically affected by test duration. With increase of test duration, the wear rate rapidly decreased. At the sliding velocity of 1.83m/s and load of 45N, the highest wear rate was 8.85×10-15m3/N·m in the test of duration 0.5h, while the lowest was 0.88×10-15m3/N·m in the test of duration 10h (the minimum and maximum times examined).
Authors: Chao Feng, Yi Xie, Zhong Wu
Abstract: In this study, attempt has been made to investigate the effect of SiC particles on the friction and wear properties of Ni/SiC composites manufactured by electrodeposition, especially for the composites with high-temperature treatment.For this purpose, α-Al2O3 was coated on the surfaces of SiC particles by sol-gel technology to inhibit interfacial reaction of SiC and nickel at high temperature. Both of the Ni/α-Al2O3-coated SiC (Ni/CSp) and Ni/uncoated SiC (Ni/UCSp) composites were treated at 600 °C to study the resulting wear behaviour. The results indicated that with heat treatment at 600 °C, the Ni/CSp composite had better tribological properties than the Ni/UCSp composite. It was proved that the uncoated SiC particles have reacted completely with nickel leaving many defects, while the coated SiC particles still remained in the Ni/CSp composite hardening the nickel matrix and supporting the counterpart, thus improving the wear resistance of Ni/CSp composite with relatively low friction coefficient and wear mass loss compared to the Ni/UCSp composite.
Authors: Chuan Bai Yu, Chun Wei
Abstract: Reinforced phenol formaldehyde resin (PF) matrix nanocomposites with different nano-SiO2 were fabricated with two-roll compounding and compression molding technology. The mechanical and tribological behaviors of the reinforced composites were studied. The friction and wear experiments were tested on a constant speed machine (D-SM). The impact and flexural strength of nanocomposites were increased by the addition of various types of SiO2, but the flexural modulus was decreased. The effects of the addition of various types of SiO2 on tribological properties of the composites were explored in this study. The results showed that the coefficient of friction of the composites increased, while the wear rate values decreased at various temperatures. Microstructure of worn surface of the tested composites was observed by scanning electronic microscope (SEM) and the wear mechanism of the reinforced composites was studied.
Authors: S. Ilaiyavel, R. Sheshathri, V.R. Alagu Sundram, A. Venkatesan
Abstract: The aim of Manganese Phosphate coating is to convert the metallic surface completely into a non metallic surface. A Phosphating is a chemical conversion treatment which produces a porous surface layer of crystalline phosphate. High carbon high chromium steels are commonly used in applications requiring excellent wear resistance in tool and die making industries. The wear characteristic of the coated steel was evaluated through pin on disc test as per ASTM G99 standards using a sliding velocity of 3.0m/s under constant loads. Taguchi’s design of L09 orthogonal array is followed selecting three parameters namely load, surface roughness, sliding distance. Optimal conditions are arrived by Signal-Noise ratio method with respect to coefficient of friction. The results are validated by analysis of variance (ANOVA) and the percentage of contribution of load, surface roughness and sliding distance for better coefficient of friction are determined.
Authors: Suiyuan Chen, Hong Fan, Di An, Jing Liang, Chang Sheng Liu
Abstract: Using atomizing Cu-Ni-Sn-Pb powder as the matrix alloy and adding 2wt% graphite as solid lubricant phase, a Cu-based self-lubricating composite reinforced with SiC ( with 0wt%, 1wt% and 2wt%14µm SiC) was prepared under the optimized powder metallurgy sintering condition. The structure and properties of the samples were analyzed using a scanning electron microscopy, X-ray diffraction, a tensile tester, a hardness tester, and a friction tester. The results indicate that the prepared sample of 1wt%14µm SiC, when sintered at 910°C for 4 hours, possessed a perfect composite structure in alloy strengthening, graphite lubrication and SiC particle reinforcing. The main phases consisted of α-solid solution of copper, CuNi2Sn, Pb, graphite, and SiC. The wear loss was 12.6mg and the friction coefficient was 0.26. SiC particles reinforcement was optimized using fine grain to enhance the anti-wear and self-lubricating properties of the alloy matrix.
Authors: Bebe Adrian Olei, Iulian Ştefan, Nicoleta Popescu
Abstract: The objective of this research is to observe the influence of the sintering temperature on the wear testing for some steel samples elaborated by powder metallurgy technology. For obtaining the steels there were used iron powders and graphite powders. The powders were homogenized in a high energy ball mill Pulverisette 6, cold compacted and then sintered in a furnace. The sintering parameters are: the sintering temperature, T = (1050, 1100, 1150)°C and the maintaining time, t = 60 minutes. The influence of the sintering parameters on the samples wear behavior is studied using both a tribometer and a profilometer.
Showing 1 to 10 of 11 Paper Titles