Microstructure and Phase Composition of NiCrBSi-TiB2 Vacuum Furnace Fused Flame-Sprayed Coatings

7th International Conference on Advanced Materials and Structures

Kazamer, N.^1,2 ; Vlean, P.C.^1,2 ; Pascal, D.T.^2 ; Muntean, R.^2 ; Mrginean, G.M.^2 ; SSerban, V.A.^1

Materials and Manufacturing Engineering Department, Politehnica University Timioara, Piaa Victoriei 2, Timioara

300006, Romania^1

Materials Science and Testing Department, Westphalian University of Applied Sciences, Neidenburgerstr. 43, Gelsenkirchen

45897, Germany^2

关键词: Elasticity moduli;    Gas extractions;    NiCrBSi;    Phase distribution;    Porosity measurement;    Sliding wear;    Theoretical aspects;    Thermally sprayed coatings;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/416/1/012001/pdf
DOI  :  10.1088/1757-899X/416/1/012001

来源: IOP

【 摘 要 】

Several studies have revealed that NiCrBSi reinforced with different intermetallic compounds exhibits characteristics that allow the material to be successfully used as a thermally sprayed coating for applications that require wear and corrosion protection. One of such materials is TiB2, as it has an elevated melting point, high elasticity modulus, increased hardness and good thermal stability. NiCrBSi was mechanically mixed with 5%, 10%, 15% and 20% vol. TiB2, flame sprayed and subsequently fused in a vacuum furnace. A remelting process under controlled atmosphere offer important advantages like good gas extraction and precise adjustment of temperature. The best performing batch of samples were selected for further analyse of microhardness and porosity measurements. The experimental results show that the thermal cycle created with the aid of the data offered by differential thermal analysis lead to a reduced porosity without affecting the hardness. X-ray diffractometry was used to characterize the phase composition while scanning electron microscopy was employed to investigate the microstructure and phase distribution. Further theoretical aspects regarding the influence of the phase composition on the coatings properties, like hardness or sliding wear conclude the work.