AlPO₄–C composite coating for high emissivity and oxidation protection applications

Abstract

AlPO 4 -C coating deposited by sol-gel technique on Ni base superalloy substrate Nimonic-75 has been examined for high emissivity applications. The coating showed a spectral (2-25 mm wavelength) emissivity in the range of 0?8-0?91, and the emissivity increased with coating thickness. The coating exhibited a reasonably good adhesion with the substrate, as determined from nanoscratch test. The above coating also had a good oxidation resistance in air at 800 and 900uC under cyclic heating and cooling conditions.

Microstructure, radiative property and thermal shock behavior of TaSi2–SiO2-borosilicate glass coating for fibrous ZrO2 ceramic insulation

“…However, single component coatings rarely possess these comprehensive properties. Generally, high emissivity coatings comprise high emissivity additives, which can improve the property of radiation, and a binder, which can be coupled with emissivity additives and the substrate [11,35]. Owing to the high melting point ( 2473 K ), appropriate thermal expansion coefficient and high hardness [36], TaSi 2 was researched as a prospective oxidation protective coating for carbon/carbon composites [37,38], improving the densification of ultra-refractory compounds [39,40] and field emission [41].…”

AlPO4-C Composite Coating on Ni-based Super Alloy Substrates for High Emissivity Applications : Experimentation on Dip Coating and Spray Coating

“…The cleaning with each chemical was performed in an ultrasonic cleaner. 23 . The synthesised sol was exposed to microwave for 5 min and diluted in ethanol before deposition of coating on C-263 substrate.…”

“…Deposition of thermal protection coating can be executed by various techniques like arc evaporation 13 , micro arc oxidation [14][15] , plasma spray 16 , physical vapor deposition 17 , electron beam physical vapor deposition 18 , electrodeposition 19 , pack cementation 20 etc. Deposition of chemical solution on the substrate by dip coating or spray coating followed by curing to develop the coating involves simple processing methodology and allows the deposition of uniform coating over a large area [21][22][23] . In the present communication, we report the development of emissivity coating on Ni-based super alloy: Nimonic 75 and C-263, which have numerous aerospace applications since the alloy is lighter and having improved mechanical properties.…”

Effect of doping graphene oxide on the structure and properties of SiO2 based high emissivity coatings

“…High emissivity coatings have important applications in thermal control and aerospace fields . By increasing the surface emissivity, the heat energy on the surface of the matrix can be radiated out quickly and efficiently in the form of infrared radiation, which can reduce the temperature of the matrix and ensure the safety of the internal structure.…”