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Glass ceramics and bearing steel surface friction and wear test


The rapid development of modern science and technology performance of the material put forward higher requirements for glass ceramics have excellent properties, such as the thermoelectric properties, corrosion resistance and biocompatibility. More important, it can be machined with ordinary metal cutting tools, therefore, the excellent performance of the glass ceramic is gradually attention has been paid. In recent years, the glass-ceramic is widely used in aerospace, defense, medical, machinery, electronics and other fields. Merchantable glass ceramic are concentrated in the Materials Preparation and properties control, with the extensive use of glass-ceramic materials, the friction and wear of the glass ceramic is gradually becoming one of the focus in the field of tribology.scientific and technical personnel are carrying out the study of friction and wear properties of glass ceramics. Author mica glass ceramics (Flourish logop it Glass Ceramics) and bearing steel (GCr15) as an example, two kinds of materials with Vice friction and wear characteristics under different load conditions, and to investigate the wear mechanism, so that the glass the wider application of ceramics related to experimental data. A test glass-ceramic composition expression is usually as the Influences of R2O-MgO-Al2O3-SiO2-F, where R represents the alkali metal. Test the material of choice for fluorine phlogopite glass ceramic, the flexural strength of the fluorine phlogopite glass ceramic is greater than or equal to 108Mpa impact toughness greater than or equal to 3.8kJ/mm2, bulk density of 2.5 ~ 2.8g/cm3 Suitable temperature -22 to +1000 ° C, the hardness HV258 ~ 273, coefficient of thermal expansion less than or equal to 94 × 10-7K-1. Pair of metal materials bearing steel (GCr15) hardness HB660 ~ 755. The test instrument for the MPX-2000 friction and wear testing machine, with vice plate pin in the form on the Mount, the fluorine phlogopite glass ceramic processing into a disc shape (φ39mm x 5mm), bearing steel, processed into a quiet shape (φ5mm × 18mm ), the test conditions as follows: rotation speed 370r/min 20 # engine oil cooling, the relative humidity of 43% to 56% at room temperature, the load ρ for 50,100,150,200 N. Plate surface in contact with the pin end, and infiltration in 20 # oil, so with a vice in a certain speed, a certain load on the friction. Record value of the friction torque data TG328B Electro optical balance every 30s measuring the mass loss before and after the specimen wear calculate the corresponding friction coefficient and wear rate. 10 trials for each test condition, calculate the average. 4XB-C metallographic microscope observation and analysis of the specimen worn surface morphology. 2 Results and discussion 2.1 friction coefficient of glass-ceramic bearing steel under different loads, the friction factor. Friction factor, to reflect the surface morphology, the contact interaction between the form and load and sliding velocity. It can be seen, with increasing wear time, the friction coefficient gradually stabilized, the final average friction coefficient value is 0.095 about fluctuations. When the load is low, p = 50N, the friction factor is relatively small, the friction factor changes between 0.06 and 0.08. When the load is higher, p 100,150,200 N-friction coefficient is relatively stable, fluctuating between 0.09 to 0.10.Relatively speaking, the harder the particle bearing steel pressed into the glass ceramic surface, the increasing load of plowing increases, the surface of the ceramic plate clear furrows gradually rough surface, resulting in the sample on friction, the friction factor increases.




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