Obtaining multilayer coatings by the detonation spraying method

Q4 Physics and Astronomy Eurasian Journal of Physics and Functional Materials Pub Date : 2021-06-22 DOI:10.32523/ejpfm.2021050208

D. Kakimzhanov, B. Rakhadilov, D. Buitkenov, L. Zhurerova, M. Rakhadilov, D. Yeskermessov

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Abstract

This work were studied the effect of technological parameters of detonation spraying on the phase composition and tribological characteristics on the bases of NiCr and Al2O3 coatings. As well as there was obtained and investigated multilayer coating on the bases of NiCr/NiCr- Al2O3/Al2O3 . It was determined that during detonation spraying the phase composition of Al2O3 coatings strongly depends on the degree of filling the borehole with a gas mixture. The a - Al2O3 -phase content in the coatings increases when the degree of filling is 63% and 54%. Only one CrNi3 phase is observed on the diffractograms and only increase of reflex intensity (020) at barrel filling by 58% is observed by sputtering on the bases of NiCr coatings in different degrees of barrel filling. The results of the coating nanohardness study showed that the hardness of the Al2O3 coating increases depending on the content of a- Al2O3 in it. Al2O3 coating has the maximum nanohardness values and is 16.42 GPa at the borehole is filled to 63%. The nanohardness of NiCr coating has the maximum values at barrel filling by 58% and consisting of 8.02 GPa.

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爆震喷涂法获得多层涂层

研究了爆震喷涂工艺参数对NiCr和Al2O3涂层相组成和摩擦学性能的影响。在NiCr/NiCr-Al2O3/Al2O3基体上制备并研究了多层涂层。已经确定，在爆震喷涂期间，Al2O3涂层的相组成强烈地取决于用气体混合物填充钻孔的程度。当填充度分别为63%和54%时，涂层中α-Al2O3相含量增加。在衍射图上仅观察到一个CrNi3相，并且通过在不同程度的桶填充的NiCr涂层基底上溅射仅观察到桶填充时反射强度（020）增加58%。涂层纳米硬度的研究结果表明，Al2O3涂层的硬度随着其中a-Al2O3含量的增加而增加。Al2O3涂层具有最大的纳米硬度值，在钻孔填充至63%时为16.42GPa。NiCr涂层的纳米硬度在桶形填充时具有58%的最大值，由8.02GPa组成。

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