The guide blade is a hollow structure with complicated cavity

which is one of the key components of heavy gas turbine.The investment casting process of the blade casting was descn′bde from the aspects of the development of the ceramic core

casting size control

quality control of the casting metallurgy

and the optimized processes were determined

such as preheating mold shell at 900

1

080℃and pouring at 1 420

1

550 ℃for 4

1

0s.And the qualified castings were produced successfully.