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首页> 外文会议>18th International IFHTSE congress >Modification of NiAl Intermetallic Coatings Processed by PTA with Chromium Carbides
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Modification of NiAl Intermetallic Coatings Processed by PTA with Chromium Carbides

机译：PTA碳化铬对NiAl金属间化合物涂层的改性

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Equipment that operates under high-temperatures can be protected with NiAl intermetallic coatings because of their metallurgical stability. This study evaluates the effect of chromium carbides added to Ni-AI intermetallic coatings processed by plasma transferred arc (PTA). Mixtures of Ni and Al powders with and without different Cr_(23)C_6 fractions (15, 30, and 45 wt %) were deposited by PTA on an AISI 304 stainless steel plate, using two different currents (100 and 150 A). Coatings were evaluated for the presence of welding defects, and the developed microstructures were characterized by X-ray diffraction and scanning electron microscopy. Vickers microhardness and semiquantitative energy dispersive spectroscopy chemical composition were also determined. NiAl and Cr_7C_3 development was confirmed by X-ray diffraction analysis. A combination of NiAI/Cr-Fe-Ni phases was identified. The hardness was strongly related to the formed phases and volume fractions. The present study shows that PTA hardfacing can be used to produce reinforced intermetallic coatings for high-temperature applications, showing significant advances toward the development of coatings that can withstand severe operation conditions.
机译：高温下运行的设备由于其冶金稳定性而可以使用NiAl金属间涂层进行保护。本研究评估了通过等离子转移弧（PTA）处理的Ni-Al金属间镀层中添加碳化铬的效果。通过PTA，使用两种不同的电流（100和150 A），通过PTA将具有和不具有Cr_（23）C_6分数（15、30和45 wt％）的Ni和Al粉的混合物沉积在AISI 304不锈钢板上。评价涂层中是否存在焊接缺陷，并通过X射线衍射和扫描电子显微镜对形成的显微​​组织进行表征。还测定了维氏显微硬度和半定量能量色散光谱化学成分。通过X射线衍射分析证实了NiAl和Cr_7C_3的显影。确定了NiAl / Cr-Fe-Ni相的组合。硬度与形成的相和体积分数密切相关。本研究表明，PTA堆焊可用于生产高温应用的增强金属间化合物涂层，显示了在可耐受恶劣操作条件的涂层开发方面的重大进展。

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