Cold-spray deposition of Ti2AlC coatings

Abstract

Ti2AlC coatings have been fabricated by cold-spray deposition. The microstructure evolution as a function of basic spray parameters temperature and pressure onto AA6060 aluminium alloy and 1.0037 steel substrates has been studied. Adherent and dense 50–80 μm thick Ti2AlC coatings were deposited on soft AA6060 substrates under gas temperature and pressure of 600 °C and 3.4 MPa, respectively, whilst comparable results were obtained on harder 1.0037 steel by using higher temperature (800 °C) and pressure (3.9 MPa)

Cr2AlC MAX phase as bond coat for thermal barrier coatings: Processing, testing under thermal gradient loading, and future challenges

“…Nevertheless, the number of works about deposition of MAX phases by thermal spray technologies is still rather limited. [24][25][26][27][28][29] Commercial powders have been used in all the reported works. Only Ti 2 AlC and Ti 3 AlC 2 have been deposited so far, with the exception of one work about Cr 2 AlC.…”

“…Gas temperatures are strongly reduced to 2000°C‐3000°C and 300°C‐1000°C for HVOF and CS, respectively, meanwhile the velocity of the particles range between 400‐700 m/s and 700‐900 m/s. Commercial Ti 2 AlC and Ti 3 AlC 2 powders have been successfully deposited by HVOF and CS, achieving high densities—although cracks were detected between spray layers, excellent adhesion to the substrates, appropriate thicknesses, and low degradation of the MAX phases . Unfortunately, these starting commercial powders contain a relatively high amount of secondary phases, which have a strong detrimental effect on the oxidation resistance.…”

“…Commercial Ti 2 AlC and Ti 3 AlC 2 powders have been successfully deposited by HVOF and CS, achieving high densities-although cracks were detected between spray layers, excellent adhesion to the substrates, appropriate thicknesses, and low degradation of the MAX phases. [24][25][26][27][28] Unfortunately, these starting commercial powders contain a relatively high amount of secondary phases, which have a strong detrimental effect on the oxidation resistance. Nevertheless, highly pure Cr 2 AlC coatings have been recently reported by some of the present authors using CS.…”

Dense and highly textured coatings obtained by aerosol deposition method from Ti3SiC2 powder: Comparison to a dense material sintered by Spark Plasma Sintering

“…For instance, a Ti 2 AlC/Ti 3 AlC 2 MAX phase was sprayed by the HVOF technique 87,88 or by Cold Spray. 89,90 Using the first process cited, the authors obtain deposits with similar preferred grains orientation with their basal planes aligned together with the substrate surface, but impurities and cracks are present due to the high temperature used. The Cold Spray process is closer to ADM as the temperature used implies no melting, low residual stress and no new phase creation.…”

Cyclic Oxidation of Ternary Layered Ti2AlC at 600–1000°C in Air

“…Furthermore, MAX phases possess ultralow friction coefficient with ready machinability . This unique combination of properties therefore makes them many potential applications such as electrical contacts, protective coating, and structural materials under extreme radiation environments in nuclear reactor . Based on the findings of first‐principles studies, it is disclosed that MAX phases have metallic‐covalent‐ionic bonds in nature, which explains why they exhibit some salient properties of both metals and ceramics.…”