Thermal sprayed steel-based coatings with ex-situ and in-situ synthesized carbide reinforcement

What is it about?

This paper compares high velocity oxy-fuel sprayed (HVOFS) stainless steel-based composite coatings with the MAS (mechanically activated synthesis) cermet (Cr3C2-Ni and TiC-NiMo) reinforcement, added ex-situ, and the ones with TiC reinforcement, synthesized in-situ.

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Why is it important?

In-situ synthesis of a reinforcing phase in both surface and bulk metal-ceramic powder composites (i.e., when the reinforcing particles, such as carbides, oxides, etc., are synthesized instantly during the manufacturing process of a composite material, not added to the raw powder mixture before it) is a hot topic nowadays. The application of the in-situ route is thought to improve the mechanical properties of the resultant composite material, and on the other hand to lessen the energy consumption and the cost of the final product. This paper demonstrates that in the current case the ex-situ addition of the TiC-based reinforcement is more beneficial, than its synthesis in-situ. It is also shown that the usage of the TiC-based reinforcement is more beneficial, than of the Cr3C2-based one.

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