【摘 要】
:
Multimodal WC-17Co coatings with 50% nano-WC and 50% micro-WC were prepared on Q235 steel substrate by high velocity oxygen fuel (HVOF) under four kinds of oxygen flows rate (322 L/min, 402 L/min, 482
【机 构】
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Jiangxi Province Engineering Research Center of Materials Surface Enhancing & Remanufacturing
【出 处】
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第十一届全国表面工程大会暨第八届全国青年表面工程学术会议
论文部分内容阅读
Multimodal WC-17Co coatings with 50% nano-WC and 50% micro-WC were prepared on Q235 steel substrate by high velocity oxygen fuel (HVOF) under four kinds of oxygen flows rate (322 L/min, 402 L/min, 482 L/min and 543 L/min), it is aim to investigate the influence of oxygen flow rate on the microstructure and properties of multimodal WC-17Co coatings. The microstructure and phase compositon of the coatings were analyzed by scanning electron microscopy (SEM) and X-ray diffraction analysis (XRD), respectively. The microhardness was measured by HVS-1000. The wear property of the coatings was tested by ML-100 pin-on-disk equipment. The results show that the microstructure of the coatings is dense and the interface between coating and substrate is good, however, with the decrease of the oxygen flow rate, the decomposition of WC phase became more serious, it is revealed that there exist more W2C and Co3W3C phases in the coating at the 322L/min oxygen flow rate. The range of the microhardness value in four coatings is 862±10.5Hv0.3 (322L/min ) to 938.4±19.9Hv0.3 (543L/min), it is also found that the microhardness value of the coating with the oxygen flow rate of 543L/min is five times as large as Q235 steel substrate (183±7Hv0.3). After the wear testing, it can be found that the coating with the oxygen flow rate of 543L/min has the best wear property, the range of the wear loss is 8.58±0.04mg (543L/min) to 15.82±0.17mg(322L/min ).
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