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2 1998

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Structure and properties of TBC coatings obtained on the nickel base superalloys by a thermal spraying method.

Swadźba L., Hetmańczyk M., Mendala B., Dudek S., Szala J.

Inżynieria Materiałowa

1998

R. XIX, nr 4

1061-1066

Results of investigations on obtaining the thermal barrier coatings (TBC) and their properties have been presented in the article. Coatings were formed by a thermal spraying method using a A3000 system controlled by computer and with a robot. For spraying the following materials: ZrO2xY2O3 and MeCrAlY as an interlayer were used. The coating structure examinations were made. Powder morphology was determined by the scanning microscope method. Tests by the thermal shock method were conducted in the air atmosphere by heating the specimens to 1200 degrees centigrade for 15 min. and cooling to 250 degrees centigrade for 5 min. Hot corrosion resistance tests were conducted at 900 degrees centigrade in the Na2SO4 medium. Tests showed low resistance of TBC coatings to that type of corrosion. The TBC coatings were formed on the combustion chamber elements.

Heat-resisting CoNiCrAl coatings obtained by the Arc-PVD method and chromoaluminized on the nickel base superalloys.

Swadźba L., Maciejny A., Mendala B.

Inżynieria Materiałowa

1998

R. XIX, nr 4

1067-1072

In the article the investigation results of obtaining and properties of the heat-resisting MeCrAlX coatings are presented. The coatings were formed on nickel. In the first stage the CoCr coatings were obtained by the Arc-PVD method (cathodic vacuum arc evaporation). Basic parameters of coatings formation were determined. High efficiency of the Arc-PVD method in the deposition from one or two sources of the complex chemical composition are shown. Relationships between the chemical composition of targets and the chemical composition of the coatings obtained by the Arc-PVD method were determined. Targets with the content of 70 wt. % Co and 30 wt. % Cr. The basic deposition parameters were determined. In the second stage coatings underwent the diffusion chromoaluminizing process. Combining the PVD and diffusion processes allowed to eliminate the substrate detrimental elements: Mo, W and Ti lowering oxidation and 'hot corrosion' resistance from the coatings.