WC-Co硬質(zhì)合金的摩擦磨損性能研究
[Abstract]:High-pressure rotary sprinkler is highly valued for its strong impact and good cleaning effect. Nozzle assembly is a key component of high pressure rotary nozzle, and its wear resistance is directly related to the service life of rotary nozzle. The friction and wear properties of cemented carbide / cemented carbide, cemented carbide / ceramic friction pair were studied in this paper. The effect of microstructure parameters on wear properties of WC-Co cemented carbide was further analyzed. The friction and wear tests were carried out between cemented carbide with WC grain size of 0.77 渭 m Co phase of 11.6 wt.% and YG6X cemented carbide ball and Si3N4 ceramic ball respectively. The friction stroke and normal load were investigated. Effects of reciprocating speed and surface roughness on friction and wear properties of friction pairs. On the basis of the experiments, the wear volume and specific wear rate of the two friction pairs were compared, and the materials of the friction pairs were selected according to the service conditions of the high pressure rotary sprinklers. The results show that the wear resistance of cemented carbides in friction pairs is affected by their matching materials, and the wear resistance of cemented carbide / cemented carbide friction pairs is better than that of cemented carbide / Si3N4 ceramic friction pairs. During the test, the normal load and the reciprocating velocity have different effects on the wear of different friction pairs. The wear rate of the cemented carbide / cemented carbide friction pair is less affected by the normal load applied. The change of normal load and reciprocating velocity has a significant effect on the wear of cemented carbide / Si3N4 ceramic friction pair. The wear rate increases linearly with the increase of normal load, and increases with the increase of reciprocating velocity. A series of cemented carbide samples with different microstructure parameters were prepared. The effects of microstructure parameters on the wear properties of cemented carbide were investigated by measuring the wear amount of the specimens and YG6X cemented carbide ball during the wear test. The wear mechanism of WC-Co cemented carbide was preliminarily analyzed by means of scanning electron microscope (SEM) (SEM), X ray energy spectrometer (EDS) and hyper-depth of field optical microscope (OM). The results show that the microstructure parameters of cemented carbides have great influence on the wear properties of cemented carbides. Under the same Co content, the smaller the particle size of WC in cemented carbide, the higher the wear resistance, and the better wear resistance of low Co content cemented carbide with the same WC particle size. During the test, the wear mechanism of cemented carbides is mainly scraping, breaking and spalling of WC grains and smearing of Co phase. The normal load has obvious influence on the wear mechanism of cemented carbides. When the normal load is small, the wear mechanism of cemented carbides appears as scraping. With the increase of normal load, the wear mechanism of cemented carbide is gradually changed into ploughing, WC grain breaking, spalling, and Co smear. For the cemented carbide / cemented carbide friction pair, the wear amount of the friction pair can be reduced and consistent only when the friction pair is made of low Co content and fine WC grain cemented carbide material. On the basis of the above research, the cemented carbide nozzle and core with WC diameter of 0.6 渭 m ~ (6) wt.%Co were prepared and tested. The results show that under 500 bar water pressure, the service life of the nozzle with high pressure rotating nozzle is more than 100h, which meets the requirements of parts cleaning quality.
【學(xué)位授予單位】:東華大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TG135.5
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