Microstructural and Mechanical Characteristic of Ceramic Composite Coating Developed by Electrophoretic Deposition
Resetiana Dwi Desiati1,2, Anawati1, Eni Sugiarti2

1 Department of Physic, Faculty of Mathematics and natural Science, University of Indonesia, Depok, Indonesia
2High Resistant Material Research Group, Research Center for Physics, Indonesian Institute of Sciences (LIPI), Serpong, Indonesia

Abstract

Ceramic composite consisted of Yttria Stabilized Zirconia (YSZ), Fe2O3 and aluminium powder has been successfully coated on inconel 625 substrate by electrophoretic deposition (EPD). A homogeneous of coating layer depends not only a stablity of EPD suspension but also an applied voltage. In the present study, constant voltage of 60V and gradient voltage of 30V followed by 60V during EPD process with total time of 6 minutes were applied in order to understand the effect of coating process on the microstructural and mechanical characteristics of ceramic composite coating. A fresh green body of ceramic coating was dried at room temperature for 24 hour prior to heat treated at temperature of 1200 C for 4 hour with heating rate of 2 °C/min using horizontal heated furnace under argon gas inert. Surface and cross-section morphology was characterized by FE-SEM (Field Emission-Scanning Electron Microscopy), while chemical content was analyzed by EDS (Energy Dispersive Spectroscopy). Hardness properties were tested by vickers hardness after heat treated samples using 500 gF for 13 second. Crystal phase formed on coated sample was characterized by XRD.The results showed that less porous structure was observed at gradien sampel which revealed that this sampel has higher hardness properties (787.76 HV) than constant sample (759.12 HV). In addition, phase formed in the YSZ + Fe2O3 + Al as ceramic composite coating was dominated by tetragonal phase of ZrO2.

Keywords: Ceramic composite coating, YSZ, Inconel, Electrophoretic Deposition

Topic: Material Science