Formation of cobalt silicide from filter metal vacuum arc deposited films

Growth of One‐Dimensional Nanostructures in Porous Polymer‐Derived Ceramics by Catalyst‐Assisted Pyrolysis. Part II: Cobalt Catalyst

“…CoSi formed at all pyrolysis temperatures in both Ar and N 2 atmospheres, similar to what was observed for the samples containing iron, in which iron silicide phases were obtained, because of the good affinity between the two elements, as found also when joining Si‐containing ceramics to cobalt or its alloys by solid‐state bonding 49 . The reduction of CoCl 2 to micrometer‐sized metallic Co particles during heating in inert atmosphere and their interaction with the silicon‐containing matrix were responsible for the formation of CoSi 35,50 .…”

“…CoSi formed at all pyrolysis temperatures in both Ar and N 2 atmospheres, similar to what was observed for the samples containing iron, in which iron silicide phases were obtained, because of the good affinity between the two elements, as found also when joining Si-containing ceramics to cobalt or its alloys by solid-state bonding. 49 The reduction of CoCl 2 to micrometersized metallic Co particles during heating in inert atmosphere and their interaction with the silicon-containing matrix were responsible for the formation of CoSi. 35,50 XRD analysis performed on samples prepared at lower temperatures (5001-12001C in 1001C steps, data not shown) demonstrated that CoSi started to form above around 12001C, parallel to the findings of Bourg et al 35 (4) Nanochemical Characterization HRTEM investigations combined with EDX measurements enabled to determine the nanochemical composition of the nanowires and to ascertain their growth mechanism.…”

Oxidation resistance of borided pure cobalt

“…However, due to the composition of the boriding powders which contained SiC and KBF 4 as a diluent and an activator, respectively, Experiments and themodynamic calculations of the reaction processes involved show that two competing processes occur during boronizing of nickel-based alloy, namely, boronizing and siliconizing [6]. It has been reported that the formation of cobalt silicides by thermal reaction of Co/Si structures [7] and the addition of Si to metals could improve their high temperature oxidation resistance [8,9]. It is well known that lots of boronized workpieces are used on the high-temperature environment, so it is necessary to know the high-temperature behavior of boride layers.…”