Powder Processing and Thermal Spraying of Barium-Magnesium-Aluminium-Silicate Enviromental Barier Coatings

Powder Processing and Thermal Spraying of Barium-Magnesium-Aluminium-Silicate Enviromental Barier Coatings

Paper in proceedings (conference paper)

In order to support further research and development in the field of Environmental Barrier Coatings (EBCs), Barium-Magnesium-Aluminium-Silicate (BMAS) was studied as a potentially promising representative of a wide family of silicate materials. BMAS powder was produced prom 15wt%BaO, 7wt%MgO, 28wt% Al2O3 and 500wt% SiO2. The raw mix was fired in a muffle furnace by optimized firing regime of 1200°C/3hour. The final product was crushed in the ball milling device down to the fraction of 20-45 micrometers. The atmospheric plasma spray (APS) technique was used to deposit the BMAS coating on a grit-blasted steel sheet substrate. With the aim to obtain the most suitable technological parameters for the spraying process, parameters recommended for pure alumina (Al2O3), yttria stabilized zirconia (YSZ), as well as several experimentally designed ones were tested. Opto-digital microscope and digital image analysis were used to evaluate the microstructure (the thickness and the areal porosity were also measured) and X-ray diffraction technique was utilized to identify the phases formed in the as-sprayed coatings.

In order to support further research and development in the field of Environmental Barrier Coatings (EBCs), Barium-Magnesium-Aluminium-Silicate (BMAS) was studied as a potentially promising representative of a wide family of silicate materials. BMAS powder was produced prom 15wt%BaO, 7wt%MgO, 28wt% Al2O3 and 500wt% SiO2. The raw mix was fired in a muffle furnace by optimized firing regime of 1200°C/3hour. The final product was crushed in the ball milling device down to the fraction of 20-45 micrometers. The atmospheric plasma spray (APS) technique was used to deposit the BMAS coating on a grit-blasted steel sheet substrate. With the aim to obtain the most suitable technological parameters for the spraying process, parameters recommended for pure alumina (Al2O3), yttria stabilized zirconia (YSZ), as well as several experimentally designed ones were tested. Opto-digital microscope and digital image analysis were used to evaluate the microstructure (the thickness and the areal porosity were also measured) and X-ray diffraction technique was utilized to identify the phases formed in the as-sprayed coatings.

powder processing; thermal spraying; enviromental barrier coating; silicate; microscopy

powder processing; thermal spraying; enviromental barrier coating; silicate; microscopy

ČELKO, L.; JECH, D.; DVOŘÁK, K.; ROČŇÁKOVÁ, I.; MONTUFAR JIMENEZ, E.; SLÁMEČKA, K.; KLAKURKOVÁ, L.

2018

01.01.2017

Trans Tech Publications Ltd.

Switzerland

978-3-0357-1018-2

Metallography XVI

0255-5476

Materials Science Forum

Swiss Confederation

569

573

5

http://www.scientificnet/MSF.891.569