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Prediction of the thermal shock resistance of refractory materials using R values

100%

Izadpanah M. R. , Dezfoli A. R. A.

tom Vol. 27, No. 1

131--140

Knowledge of the thermal shock resistance of refractory materials is of particular importance in a variety of applications. To meet the needs of these various applications, a number of thermal shock parameters based on material properties have been developed. The area of thermal shock resistance of refractories is often one of conflicting results in terms of agreement between experimental observations and predictions based on parameters of materials. The current study presents the temperature and stress distributions in magnesite samples. This information plus other results obtained from thermal and mechanical properties of these materials are used to develop a model which predicts the number of quench cycles for various refractory materials. The comparison of the theoretical values using the solution of the presented model with experimental data for materials having different thermal resistances shows a close agreement.

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

38%

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

tom 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.