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首页> 外文会议>International Latin-American Conference on Powder Technology(PTECH 2005); 20051026-29; Cosat do Sauipe(BR) >High Temperature Erosion-Oxidation Behavior of Thermally Sprayed NiCr Based Alloy and Cermets Coatings
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High Temperature Erosion-Oxidation Behavior of Thermally Sprayed NiCr Based Alloy and Cermets Coatings

机译：热喷涂NiCr基合金和金属陶瓷涂层的高温冲蚀氧化行为

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摘要

The erosion-oxidation (E-O) behavior of high velocity oxy fuel (HVOF) sprayed Ni20Cr 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℃ and with erodent impact velocities of 2.5-19.5 ms~(-1). Alumina powder (～200μm) was used as the erodent. The E-O resistance of the coatings was determined as wastage, as a function of temperature. The three coatings did not exhibit any significant change in E-O at temperatures up to 500-600℃. At higher temperatures, wastage increased with temperature, reached a maximum at 700℃ and then decreased with further increase in temperature. Different E-O regimes were identified. The specimen surfaces were examined in a scanning electron microscope and their roughness determined. E-O maps have been drawn that 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HV20 Ni20Cr合金的腐蚀-氧化（E-O）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，该组件在温度范围为500-850℃的侵蚀颗粒流化床上旋转，侵蚀冲击速度为2.5-19.5 ms〜（-1）。氧化铝粉（〜200μm）用作腐蚀剂。确定涂层的抗E-O性能与温度的关系为损耗。在高达500-600℃的温度下，三种涂层的E-O均无任何明显变化。在较高温度下，损耗随温度升高而增加，在700℃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-O机制。在扫描电子显微镜中检查样品表面并确定其粗糙度。已绘制了E-O图，该图定义了涂层经受低，中和严重浪费的条件。

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