Paper Title:
The Influence of Thermal Sprayed Coats Chemical Composition on the Microstructure and Properties
  Abstract

In the present work, the microstructure, phase composition and microhardness of Cr3C2-NiCr, WCCo, and powdered composite NiCrSiBCr10%,Fe2.5%,Si3.1%,Bi2.1%C; NiCrSiBFe5; NiCrSiBCr5; NiCrSiBFe2.5Cr2.5; HVOF coatings applied on the Al-Si substrate have been compared. The coating cross-sections were examined by optical microscopy (OM), scanning electron microscopy (SEM) and electron transmission microscopy (TEM). For hard Cr3C2-NiCr and WC-Co coatings, a total microhardness level of about 860 and 1240 HV, respectively, was obtained. The microhardness of composite coatings was essentially lower and comprised in the range of values between 420 and 540 HV. The lowest level of microhardness showed the NiCrSiBFe2.5Cr2.5 coating. The most refined microstructure was found in Cr3C2 and WC coatings. The mean size of splat granules obtained in Cr3C2-NiCr had the value of about 2.7 m and of 0.5 m in WC-Co. For comparison, the granules obtained in composite coatings had the dimensions of about 30 μm. An Xray diffraction (XRD) revealed the presence of Cr3C2 and WC carbides in Cr3C2-CrNi and WC-Co coatings. In composite coatings, the phases of Cr3Ni5Si2, Ni3Si, FeSi, Fe2B, Cr3Si, BCr as well as other phases were found. The existence of the analyzed phases was additionally confirmed by the selective etching of coating microstructure. The annealing of coatings at 823K resulted in pore disappearance and increased the coating microhardness.

  Info
Periodical
Edited by
Maria Richert
Pages
113-120
DOI
10.4028/www.scientific.net/MSF.674.113
Citation
M. Książek, I. H. Nejman, P. Pałka, R. Grzelka, "The Influence of Thermal Sprayed Coats Chemical Composition on the Microstructure and Properties", Materials Science Forum, Vol. 674, pp. 113-120, 2011
Online since
February 2011
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Shahin Khameneh Asl, Mohammad Reza Saghi Beyragh, Mahdi Ghassemi Kakroudi
Abstract:Interest in nanomaterials has increased in recent years. This is due to the potential of size reduction to nanometric scale to provide...
13
Authors: Yu Xin Gao, Cheng Zhao, Zhi Gang Fang, Jian Yi
Abstract:Micro-nanostructure coatings have been attempted to prepare by Electro-spark deposition (ESD) on cast iron substrate. The microstructures and...
176
Authors: Z.Y. Al-Taha, M.S.J. Hashmi, Bekir Sami Yilbas
Abstract:HVOF coating finds application in industry to protect the surface from the harsh environments such as high temperature, corrosion, and...
1972
Authors: San Ming Du, Yong Ping Niu, Yong Zhen Zhang
Chapter 5: Coatings and Surface Engineering
Abstract:In the present study, 20 Wt. % ZrO2-Al2O3-17 wt.% TiO2 powders were sprayed using a plasma-spray...
420
Authors: Ren Guo Song, Pu Hong Tang, Chao Wang, Guo Lu
Chapter 2: Surface Engineering/Coatings
Abstract:Al2O3 and Al2O3-40wt.%TiO2 ceramic coatings on H13 hot-worked die steel have been...
235