A coating reinforced with in situ synthesis of Ti

3

SiC

2

-TiB

2

particulates has been fabricated successfully on the Ti-6Al-4V alloy by the low oxygen partial pressure fusing technique in the Al-Si-B

4

C powders system.The results reveal that the coating consists of two layers

that is the outer layer consists of high volume fraction of Ti

3

SiC

2

TiB

2

and the inner of TiAl

3

and Al layer with the obvious layered distribution of phase composition.The role of aluminum is served as a diluent agent through decreasing the molar fraction of reactant in slurry

as a activator agent through promoting the coating formation

as a assistant agent through decreasing the reactive temperature for Ti

3

SiC

2

formation

as a deoxidant agent through removing the oxygen in heating system

and as a stuffing agent through favoring the densification of coating during the coating fabrication.