A new high emissivity coating on Ni-based superalloy substrate

Abstract:

High emissivity coatings used in high temperature condition are attracting great attention in the worldwide to effectively transfer heat by radiation. Here we prepared a new high emissivity coating by using spray painting method. The coating contains amorphous borosilicate glass, Mg2B2O5, MoSi2 and SiB4 and has the thickness of about 50μm. The coating exhibits excellent thermal shock resistance (more than 100 thermal cycles from 950 oC to water temperature). The average emissivity of the coating is 0.905?.024 at 950 oC and has a slight degradation after 100 thermal cycles.

Key words:coating; emissivity; thermal protection system; thermal shock resistance