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TEM Study on the Interfaces of Thermal Sprayed Mo and Al Coatings

Qian Shengwei Wen Lishi Guan Kan (Institute of Metal Research,Academia Sinica,Shenyang)  
The interface phase,composition and structure of plasma sprayed Mo coatingand arc sprayed Al coating were studied by using TEM in combination with opticalmetallography,XRD and EPMA.It is shown that the bonding type of Mo coatingwith steel substrate is mainly metallurgical bonding with numerous reaction productsin the interface area and a width of interface diffusion zone of about 20-40μm Onthe contrary,the bonding of arc sprayed Al coating and steel substrate is mainlymechanical and physical,The metallugical reaction happened only in some isolatedpoints.A survey of bonding mechanism of the two coatings was also given.
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