Fluidized bed technology has been successfully used in the formation of different types of coatings e.g. aluminizing [1–3], chromizing [1–3], nitriding [4], carburizing [4], carbonitriding [4]. Limited information however exists on boride coatings obtained using fluidized bed technology, though the method is simple, efficient and environmentally friendly. Boride coatings on steel have been reported to have an excellent combination of properties [5, 6, 10], and titanium borides are well known for their high hardness and excellent corrosion and wear resistance. However, no reference could be cited in the literature concerning Tiboride coatings, on Ti alloys obtained in a fluidized bed reactor. Ti and its alloys, especially with Al, are attracting considerable attention because of their potential use as low-density and high temperature structural materials [14–16]. Their inadequate oxidation resistance at elevated temperatures (>800 ◦C) however limits their practical applications. Addition of alloying elements such as Nb, Si, C, B do improve the oxidation resistance of these alloys, but the amounts of these additives should be controlled at low levels [11]. Use of surface modification techniques such as ion implantation of Al ions in to Ti-Al alloys, produce a high oxidation resistant TiAl3 coating, whose final overall oxidation resistance is nevertheless mitigated by the inherently developed cracks and voids in the coating [12, 13]. On the other hand, thermochemical diffusion processing such as boronizing in fluidized beds is a promising method for improving the oxidation resistance of Ti and its alloys, as it is a flexible and low cost method, yielding boride layers of excellent quality and uniformity. The main advantage of the process of fluidization, is the high rate of mass and heat transfer, which results in a uniform temperature throughout the volume of the reactor and a flash mix of all compounds contained in it, thus yielding high quality coatings [7–9]. Additional advantages arise from, the process capability for quick parameter adjustment, the relatively low capital and operation costs and its being environmentally friendly. Some of the main parameters affecting the quality of the fluidization process and that of the produced coatings, obviously are the properties of solids and fluids used, bed geometry, gas flow rate, type of gas distributor and overall reactor design. This paper presents some of the results produced by a study of boride coatings applied onto Ti-Al-V alloys by the fluidized bed process. The fluidized bed reactor system used for the above and shown schematically in Fig. 1, consisted of the following five main components: