Papers by Keyword: Friction Property

Abstract: The surface composite layer Ni/ZrO₂ on the ZG45 cast steel surface was fabricated through vacuum infiltration casting method. This paper researched on the Ni/ZrO₂ composite infiltrated layer morphology, hardness and the friction property under fry friction. The results show that the main phase structure of the layer is ZrO₂, Cr₂B, NiB and FeNi. The macrohardness of the layer is HRC60~64. The micohardness presents gradient change. The maximum hardness appears at subsuface. The 10% ZrO₂ composite infiltrated layer wear resistance increases 10 times and 15% ZrO₂ composite infiltrated layer increases 22.6 times than ZG45 under the 100N load. The 10% ZrO₂ composite infiltrated layer wear resistance increases 8.5 times and 15% ZrO₂ composite infiltrated layer increases 21.9 times under 250N load. The wear resistance has greatly improved.

Abstract: In this study, WS₂-dispersed Al composite material was fabricated by Compression Shearing Method at Room Temperature, using various WS₂ content ratios. The mechanical and friction properties of the WS₂-dispersed Al composites were measured. As a result, the density measurements showed that the compacted WS₂-dispersed aluminum composite had a relative density of 95 to 99%. Tensile strength of WS₂-dispersed Al has 200 MPa. The friction coefficient of Al/0.5vol.%WS₂ was 0.14, a reduction of 83%, in comparison with the 1.0 friction coefficient of the pure Al matrix material. The addition of WS₂ to the matrix systems used reduced the friction coefficient. Therefore, WS₂-dispersed Al composite material is useful for maintenance-free material of slide member.

Abstract: Two kinds of polytetrafluoroethylene (PTFE) composites PTFE/GF/Gr (sample 1) and PTFE/GF/Gr/Cu (sample 2) were prepared by mixed molding method. X-ray diffraction results show that sample 2 is crystal structure, while sample 1 is amorphous/crystal structure. They were processed into the bearing bushes, which were installed on the water pump bearing to study the influence of different structures on friction properties by rotating bearing. Experimental results reveal that the wearing rate of sample 2 is much higher than that of sample 1. From the optical microscope and SEM analysis of the worn surface, it indicates that the wearing mechanism of sample 1 with amorphous structure is adhesive wearing, while that of sample 2 is abrasive and fatigue wearing mechanism. Our results indicate that the PTFE composition with amorphous matrix can be used to sliding bearings because of its ideal self-lubricating properties.

Abstract: The antibacterial agent (LZB-GC) was added to composite resin materials with varied ratio (0.5%, 1%, 1.5%, and 2%) by mechanical and ultrasonic methods. The effects of different contents of the antibacterial agent on the mechanical and fibration properties of the composite resin were measured. The results showed 1.5% group acquired the best flexural strength, and the surface hardness decreased while the friction coefficient increased with improving the antibacterial agent content.

Abstract: In order to understand the mechanical properties of the soybean protein fibers (simply called SPF) in different processing condition, the tensile and frictional properties of the SPF are measured with different instruments. By the analysis of the results, the following conclusions can be deduced: bleaching has an influence on decreasing tenacity at break for each test modality. Knotted and looped modalities decrease fiber tenacity remarkably in all three samples, and the same occurs with elongation at break. Looped modalities show lower tenacity and elongation at break, the lowest being the bleached fibers in looped modalities.

Abstract: An object’s fine surface can change the object's surface friction property. So this paper aims to study the friction property of concave laser-textured surface through experiment. First, the Nd:YAG laser is used to generate micro-pores on Cr12 steel surface in the research and then its impact on object's surface friction property is studied. The test result shows that compared with the non-textured surfaces, the concave surface with area density of 5% and depth of I10.8 can reduce the friction coefficient significantly.

Abstract: To research basic property of milk protein fibre, basic property of milk protein fiber and wool were tested and analysed. Through analysing and contrasting each property it is considered that in dry state the strength of milk protein fiber is close to the soybean protein fiber and bigger than wool, the dynamic and static friction coefficient of milk protein fiber is bigger than that of soybean protein fiber. Crimpability of milk protein fiber is worse than that of wool.

Abstract: After Iodide modification using KI solution on the surface of nitrile rubber, the treatment effect on the friction properties of nitrile rubber are explored. Experiments using different concentrations KI solution, soaking the samples for different time, the friction properties of the samples are tested under different load and lubrication. The results showed that, under different conditions, the surface of iodide modified nitrile rubber is dense and smooth, with the increase of KI concentration and soaking time, the degree of iodide modification is deeper, and the friction properties of NBR is also significantly improved.

Abstract: A new ZrO₂ nano-composite ceramic tool and die material was prepared with vacuum hot pressing technology. The friction and wear behaviors of ZrO₂ nano-composite ceramic tool and die materials in sliding against 45 chilled steel rings under dry friction were investigated by using an MMW-1A abrasion wear tester. The mechanical properties and the friction and wear properties of the composites with various compositions and contents were studied. It is indicated that the changing trends of the wear rate and the mechanical properties of the composites with the change of TiB₂ and Al₂O₃ contents are roughly the same, but the friction coefficient is not obviously. The friction and wear properties and the mechanical properties are finer when the TiB₂ and Al₂O₃ content is both 10%.

Abstract: In order to understand the mechanical properties of the PLA fibers, the basic properties of the PLA fibers are measured with different instruments. By the analysis of the results, the following conclusions can be deduced: in the dry state, the initial module and the breaking elongation of the PLA fibers are greater than that of the polyester and nylon and the breaking strength and the breaking work of the PLA fibers are situated between that of the polyester and nylon; in the wet state, the mechanical properties of the PLA fibers have more remarkable changes.