Study on high-temperature erosion wear resistance of phosphate ceramic coating
[Introduction]The boiler pipes of waste incinerator face a serious erosion wear problem at high temperature.The study on high-temperature erosion wear resistance of phosphate ceramic coating may help to achieve the long-term protection of them.[Method]A phosphate ceramic coating was prepared with concentrated phosphoric acid,aluminum hydroxide,magnesium oxide,and zinc oxide on the surface of 12Cr1MoV steel.High-temperature erosion wear test was carried out on the coating with different amounts of abrasive particles at various impingement angles.The microstructure and worn surface morphology of the coating were examined by X-ray diffraction(XRD)and scanning electron microscopy(SEM).The high-temperature erosion wear mechanism of the coating was discussed.[Result]The mass loss of phosphate ceramic coating was increased linearly with the increasing of the amount of abrasive particles per unit time,and the maximum erosion rate occurred at an impingement angle of 90°.As the impingement angle decreased,the erosion rate gradually reduced and the worn area was changed from circular to elliptical shape.There were many pits formed on the coating surface after erosion wear test,and the larger the impingement angle was,the clearer and deeper the pits became.[Conclusion]The phosphate ceramic coating conforms to the erosion wear law of brittle materials,and is suitable for protecting the boiler pipes of waste incinerator.
phosphate ceramic coatinghigh temperature erosion wearimpingement anglemechanism
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