|
|
The choice of material for the production of blade wheels of jet aircraft engines
Černý, Michal ; Hutařová, Simona (referee) ; Němec, Karel (advisor)
This bachelor's thesis provides a basic overview of the materials used in the production of turbine blades of jet aircraft engines. An aircraft engine can be divided into two parts - cold and hot part, each with very different requirements for the materials used in them. The conditions in the cold part are relatively mild and the requirements are more or less satisfied by the currently used materials. The goals for further development are primarily a reduction in density and an increase in strength and fatigue properties. The real challenge of the aerospace industry is to find materials capable of working under extreme conditions in the hot part, therefore this work devotes most of the scope to the given issue. The basic overview is created by synthesizing several sources. Most of the information is drawn from American books giving a comprehensive picture of materials and manufacturing processes for this use. After decades of research, nickel superalloys in combination with thermal coatings and cooling vents proved to be the most suitable materials. Their properties, structure and production process form the basis of knowledge on this topic. The main goal for the development is to increase the temperature at which these materials are able to function, as a higher temperature of the flue gas entering the turbine means higher efficiency and associated financial and ecological savings. Despite years of research and properties unmatched by any other material, I believe there is still room for improvement. With the advent of new technologies, the emergence of a new group of materials on a different basis than nickel superalloys is possible. A brief description of several promising newly tested groups of materials, as well as my view on the future of the industry, form the final part of this work.
|
guest ::
