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首页> 外文期刊>Surface Engineering >High temperature oxidation and erosion-oxidation behaviour of HVOF sprayed Ni-20Cr, WC-20Cr -7Ni and C_3C_2-Ni-20Cr coatings
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High temperature oxidation and erosion-oxidation behaviour of HVOF sprayed Ni-20Cr, WC-20Cr -7Ni and C_3C_2-Ni-20Cr coatings

机译：HVOF喷涂Ni-20Cr，WC-20Cr -7Ni和C_3C_2-Ni-20Cr涂层的高温氧化和侵蚀氧化行为

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摘要

The oxidation and erosion-oxidation (E-0) behaviour of high velocity oxy fuel sprayed Ni-20Cr alloy as well as WC and Cr_3C_2 cermet coatings on a steel substrate were studied. The E-0 tests were carried out in a rig with specimen assemblies that were rotated through a fluidized bed of erodent particles in the temperature range 500-850 deg C and with erodent impact velocities of 2.5-19.5 m s~(-1). Alumina powder (approx 200 mu m) was used as the erodent. The oxidation behaviour of the coatings was determined gravimetrically. The Ni-20Cr and Cr_3C_2-25(Ni-20Cr) coatings showed significantly higher oxidation resistance than the WC-20Cr-7Ni coating, especially at temperatures above 800 deg C. The E-O resistance of the coatings was determined by wastage, as a function of temperature. The three coatings did not show any significant change in E-0 at temperatures up to 500-600 deg C. At higher temperatures, wastage increased with temperature, reached a maximum at 700 deg C and then decreased with further increase in temperature. Different E-0 regimes were identified. The specimen surfaces were examined in a scanning electron microscope and their roughness determined. E-0 maps have been drawn to define conditions under which the coatings undergo low, moderate and severe wastage.
机译：研究了高速火焰燃料喷涂的Ni-20Cr合金的氧化和腐蚀-氧化（E-0）行为以及钢基底上的WC和Cr_3C_2金属陶瓷涂层。 E-0测试是在装备有样品组件的设备中进行的，该组件旋转通过温度范围为500-850摄氏度且侵蚀冲击速度为2.5-19.5 m s〜（-1）的侵蚀颗粒流化床。用氧化铝粉（约200μm）作为侵蚀剂。重量测定涂层的氧化行为。 Ni-20Cr和Cr_3C_2-25（Ni-20Cr）涂层的抗氧化性明显高于WC-20Cr-7Ni涂层，尤其是在800摄氏度以上的温度下。涂层的EO电阻是由损耗决定的，温度。在高达500-600摄氏度的温度下，这三种涂层的E-0没有显示出任何明显的变化。在更高的温度下，损耗随着温度的升高而增加，在700摄氏度时达到最大值，然后随着温度的进一步升高而降低。确定了不同的E-0机制。在扫描电子显微镜中检查样品表面并确定其粗糙度。绘制了E-0图以定义涂层在低，中和严重浪费状态下的状况。

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