مهدی احمدپور

Improvement of hot corrosion resistance in calcium magnesium aluminosilicate environments is one of the new main goals in development of turbine industries especially thermal barrier coatings (TBCs). The purpose of this research is to improve the quality and efficiency of YSZ thermal barrier coating in calcium magnesium aluminosilicate environments through replacing YSZ/CSZ composite layer. For this purpose, single layer YSZ and dual layer YSZ/CSZ TBCs deposited with atmospheric plasma spray (APS) technique on Ni-based superalloy (IN738LC) substrates as a top coat with a CoNiCrAlY bond coat. Hot corrosion resistance of the samples was investigated in a cyclic mode in which after each 4 h exposure to calcium magnesium aluminosilicate salts at 1150°C. The results of microstructural and phase studies of coatings by FESEM/EDS and XRD analysis before and after hot corrosion tests showed better resistance to dual layer YSZ/CSZ than single layer YSZ coatings and could act as barrier for the corrosive calcium magnesium aluminosilicate salts penetration into the TBC. Also, destruction of TBCs in calcium magnesium aluminosilicate environments due to infiltration of molten salts into the TBCs during hot corrosion process and cause the transformation of tetragonal zirconia to monoclinic phase during cooling.

Morality is one of the elements that influences social activities and plays a key role in the success of religious preaching. The subject of this research is "ethics of religious propagation" and its main goal is "ethical harm in the field of preaching of religion". This research, using two methods of library and field studies, attempts to answer the fundamental question of what moral damages are in the field of preaching of religion and how many they are? What are their causes and reasons? The main findings of the research are, firstly, the moral damages in the field of propagation of religion are divided into two main types of individual and organizational; secondly, the weakness of the religious beliefs of the clergies themselves, the low level of high motivation and entry into the field of preaching before obtaining the necessary preparations, are counted as the most important causes and grounds of moral harm are in the field of propagation of religion and, thirdly, the most important causes and grounds of moral harm to the organization are: the lack of an organization Strong and efficient management at the head of religious preaching organizations, the absence of organizational ethical charts, superficial engagement with organizational ethics and disregard Education and the promotion of ethics in the organization and institutionalizing ethics in the organizational culture.