利用空气气氛电炉在液态金属熔体中应用扩散涂层工艺的技术基础

IF 0.6 Q4 METALLURGY & METALLURGICAL ENGINEERING CIS Iron and Steel Review Pub Date : 2022-06-30 DOI:10.17580/cisisr.2022.01.12
N. Serdiuk, E. Pryakhin, A. Sivenkov
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引用次数: 0

摘要

在已知的液相涂层应用技术中,低熔点金属熔体中组分表面的扩散饱和是最有效的。然而,目前这项技术是通过使用带有保护介质的特殊装置来实现的,这主要限制了它的广泛应用。本工作介绍了使用空气气氛电炉在低熔点金属熔体中扩散涂层应用过程的研究结果。由于电炉氧化介质对所得涂层质量的影响,在现代机械制造生产设施中广泛应用的竖炉或马弗炉中使用该工艺意味着对现有技术进行了重要的创新。因此,制定了以下两个进行研究的目标:全面研究使用液态金属熔体在空气气氛电炉氧化作用条件下的涂层形成规律,以及为消除熔体和加工产品的高温氧化对涂层质量的有害影响提出实用建议。在低熔点金属熔体中使用有空气气氛的电炉对钢产品形成扩散金属涂层的建议工艺路线进行试验是一个实际问题。提出了用不同的助熔剂保护终熔体和产品表面不被氧化的方法。nacl - na2co3盐的混合使用不能保护金属液和钢制品表面免受高温氧化。使用na2b4o7作为保护剂也不能有效地防止高温氧化,因为得到了厚度为9 ~ 10 μm的多孔不均匀扩散镍涂层。以CaO-Li - 2o_3 - b2o_3助熔剂效果最好。得到了厚度为20 ~ 22 μm的单层均匀无孔均匀扩散镍镀层。
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Technological basis for the process of application of diffusion coatings in liquid metal melts with use of electric furnaces with air atmosphere
Diffusion saturation of the components surfaces in the melts of low-melting metals is the most efficient among known technologies for application of coatings from a liquid phase. However, as soon as this technology is realized at present time with use of special units with protective media, it restricts principally its wide practice. This work presents the results of examination of application processes for diffusion coatings in the melts of low-melting metals using electric furnaces with air atmosphere. Use of this process in shaft or muffle furnaces, which are widely applied at the modern machine-building production facilities, means introduction of the important innovations in the existing technology due to the effect of electric furnace oxidizing medium on quality of obtained coatings. Thereby two following aims of the conducted investigations were formulated: comprehensive study of coatings forming regularities with use of liquid metal melts in the conditions of oxidizing effect in electric furnaces with air atmosphere, as well as development of practical recommendations for elimination of harmful influence of high-temperature oxidation of melt and processing product on quality of coatings. Testing of suggested technological routes for forming of diffusion metallic coatings on steel products in low-melting metal melts using electric furnaces with air atmosphere is an actual problem. Protection of final melt and product surface from oxidation using different fluxes is proposed. Use of the mix of NaCl-Na 2 CO 3 salts didn’t provide protection of liquid metal bath and steel product surface from high-temperature oxidation. Use of Na 2 B 4 O 7 as a protective flux also didn’t provide efficient protection from high-temperature oxidation, because porous inhomoge-neously distributed diffusion nickel coating with thickness 9-10 μm was obtained. The best result was achieved using CaO-Li 2 CO 3 -B 2 O 3 flux. As a result, single-layered, uniform, porous-free, homogeneously distributed diffusion nickel coating with thickness 20-22 μm was obtained.
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来源期刊
CIS Iron and Steel Review
CIS Iron and Steel Review METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
2.50
自引率
12.50%
发文量
21
期刊介绍: “CIS Iron and Steel Review” is the only Russian metallurgical scientific-technical journal in English, publishing materials about whole spectrum of the problems, innovations and news of foreign iron and steel industry. The mission of this edition is to make foreign specialists aware about scientific and technical researches and development in iron and steel industry in the former USSR countries.
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