| With the development of society, the aircraft is change rapidly, as thecore of aircraft----engine is becoming an important element, in modernaircraft development. With the improvement of Aero engine, there hasbeen new requirements for aircraft turbine blade such as higher workingtemperature, higher working pressure, more lightweight and so on.Therefore, in some sense, the casting process of the blade directlydetermines the future of the engine. In the aircraft engine, The blade mustbear the highest temperature, stress and the working in the most complexsituation, it being described as the heart of the engine, and was also hailedas the jewel on the crown.The performance level of Turbine blade, hasbecome an important symbol of model engine.To casting the blade, how to make the casting shell has became the keytechnology, the shell is directly related to the quality and the mechanicalbehavior of the blade, in a certain sense, also is a symbol of nationalaviation industry level.Now we mainly use Al203to make the shells, but in actual productionpractice we have discovered, that the permeability of the shell is not very well and still too strong high after casting. It’s very hard for us to take theblade out of the shell and of course it is a fatal defect to the casting process.This paper introduces how to use carbon to improve the permeabilityand collapsibility of the Al203shell, and show the Influence on the shellstrength, creep, shrinkage, and morphology when added with different sizeof carbon, we also find out the Relationship between the microscopicstructure and the Macroscopic properties. At last we find that the shelladded with carbon(C shell) can Provide better permeability andcollapsibility while keep the strength, creep,and shrinkage good enough tothe needed.So it’s a successful experiment provide a good shell to thetechnology of Single crystal blade. |
