The Iron-Tungsten boride based composite was coated on the inner surface of steel pipes by centrifugal-self-propagating high-temperature synthesis (centrifugal-SHS) process. The precursors were prepared by a stoichiometric ratio of wolframite mineral (Fe (Mn)WO4), aluminum (Al) and boron oxide (B2O3). Phase composition and microstructure of composite coating were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM). On this study, depending on the rotation speed, the highest rotation speed (2250 rpm) produced highest micro-hardness of the composite (1699 HV).

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In this study, FeW 2 B-based composite coating on the inner surface of a steel pipe was produced by centrifugal-Self-propagating high-temperature synthesis (SHS) process. There were FeWO 4 , B 2 O 3 , and Al powders as the major reactants. The effects of coupled additives X(Fe 2 O 3 Al) of X = 1, 3, and 5 molar ratio on morphology, composition and micro-hardness of the obtained composite coatings were investigated. The results showed that the system of X = 1 mole was the optimum condition due to its reasonable smoothness (6.5¯m) and hardest (727.90 and 1170.71 HV on alloy and ceramic layers, respectively).