Patent ID: 7622152

Claim:
A manufacturing method of a MoSi 2 —Si 3 N 4 composite coating which is coated on molybden (Mo), molybden alloy, niobium coated by molybden, or niobium alloy coated by niobium or molybden, comprising the steps of: forming a MoSi 2 diffusion layer by vapor-depositing of silicon on a surface of a base material by the CVD method; transforming the MoSi 2 diffusion layer into a Mo 5 Si 3 diffusion layer by heating under a high-purity hydrogen or argon atmosphere; forming a Mo 2 N—Si 3 N 4 composite diffusion layer by vapor-depositing of nitrogen on the surface of the Mo 5 Si 3 diffusion layer by the CVD method; and forming a MoSi 2 —Si 3 N 4 composite coating by vapor-depositing of silicon on the surface of the Mo 2 N—Si 3 N 4 composite diffusion layer.