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Investigation of protective composite coatings on the basis of nickel metal matrix

Abstract

In the present study, the opportunity to improve the coatings properties using re-melting technique is studied. In the aim to determine the influence of the re-melting on the properties of coatings, the experimental study was performed. The surface of S235J0 steel was coated using three different re-melting methods with different heating duration. The mixture of NiCrFeCSiB alloy powders and carbides of WC type was used for spraying. The principal characteristics of the sprayed coatings were examined and compared with each other. The tests allowed concluding that the introduction of the re-melting process of different duration has tangible impact upon the structure, hardness and wearing resistance of the coatings.


Article in Lithuanian.


Apsauginių kompozicinių dangų metalinės nikelio matricos pagrindu tyrimas


Santrauka


Šiame darbe tiriamos NiCrFeCSiB+40 % WC purkštinės dangos, suformuotos taikant dvipakopį purškimo / perlydymo procesą. Užpurkštos dangos perlydytos taikant tris skirtingus kaitinimo būdus – liepsninį, indukcinį ir krosnyje. Ištirta perlydytų dangų mikrostruktūros evoliucija, cheminių elementų koncentracijos pasiskirstymas dangose, mikrokietumas ir atsparumas dilimui esant skirtingam kaitinimo laikui. Nustatyta, kas visi trys kaitinimo būdai formuoja panašią dangų mikrostruktūrą; dangų morfologiniai ypatumai ir savybės priklauso nuo kaitinimo laiko. Optimali dangos struktūra susiformuoja siaurame kaitinimo trukmės intervale ir turi tokius požymius: tanki metalinė matrica, metalurginis ryšys tarp dangos ir substrato, WC karbidai, nespėję ištirpti metalinėje matricoje ir tolygiai pasiskirstę dangoje. Tokios struktūros dangų kietumas yra didžiausias, atsparumas dilimui geriausias ir gera adhezija su substratu. Šiame darbe tokia struktūra buvo gauta kaitinant užpurkštą dangą neutralia acetileno ir deguonies liepsna 2 min po vonelės susidarymo; dangos kietumas siekė 880 HK.


Reikšminiai žodžiai: Ni-WC dangos, terminis purškimas, mikrokietumas, mikrostruktūra.

Keyword : Ni-WC coatings, thermal spray, hardness, microstructure

How to Cite
Gendvilis, A., & Škamat, J. (2019). Investigation of protective composite coatings on the basis of nickel metal matrix. Mokslas – Lietuvos Ateitis / Science – Future of Lithuania, 11. https://doi.org/10.3846/mla.2019.7066
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Feb 1, 2019
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This work is licensed under a Creative Commons Attribution 4.0 International License.

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