Use for Hastelloy mesh with ceramics for advanced turbine components
With the advancement of turbine materials, they widely depend on the enhancements to nickel based super alloys. Nickel alloys such as Hastelloy grades are a significant class of materials that offer good strength at high temperature, toughness and cracking resistance in the corrosive and oxidizing media. An increase in service temperature is directly connected to the efficiency enhancement in turbines and engines. So, it gradually demands an increase in service temperature of turbines and engines.
An increase in turbine inlet temperature develops greater work significant for shaft power and thrust that offers greater efficiency and decreased fuel costs as well as emissions. So in order to operate power plants more efficiently, it needs high temperature materials with supreme strength as well as elevated temperature potential.
Nickel alloy Inconel mesh is development for use in the increased service temperatures. It offers excellently high strength at the high temperatures as well as has good resistance to degradation in corrosive and oxidizing media. It is used in aerospace and power plant units that serve at temperatures from 760oC to 815oC offering good tolerance at the higher temperatures. It is known for offering supreme mechanical and thermal properties. In extreme cases of turbine components, the localized temperature reaches up to 1200oC that is about 90% of the melting point of traditional nickel alloys. So for the extreme cases, use of Hastelloy mesh is recommended as a suitable material.
For the elevated temperature applications, Nickel based Hastelloy wire mesh is embedded into the ceramic-matrix composite materials. The mechanical characteristics and oxidizing nature at 1050oC were tested. The designs, development and evaluation of the mechanical strength, cyclic and isothermal oxidation of the materials. After developing the meshes, the plasma spraying is applied.
The bonding strength in the some CMC samples are enhanced by vacuum heat processing then sprayed and heat processed materials undergo bending and impact tests. Hastelloy X mesh shows increased strength. In order to improve the oxidation and mechanical characteristics of this composite, it is coated with more effective ceramic. Overall the benefits of Hastelloy mesh composite refer additional testing and analysis.
The high temperature characteristics of Hastelloy mesh enable it for use in the hot areas of rockets, turbines and heat exchangers.
In order to improve the characteristics of nickel super alloys to serve at the high temperatures for longer periods, they are combined with ceramics. This combination allows them to withstand vast mechanical strength, frequent switches in vibrational loading, chemical reactions with the neighboring components, oxidation, environmental and localized corrosion factors. Use of Hastelloy mesh with ceramics allow the components to successfully deal with high temperature and loading factors that are the prime demand of latest turbine applications. It allows to control the component cost, application cost as well as maintenance costs. Moreover the fuel efficiency and emissions are also the major factors the new technique for high temperature turbine engine construction materials. So in order to meet these demands, use of high temperature alloys wit ceramics called as ceramic composite perfectly meets the service and life cycle requirements.