Designing oxidation resistant ultra-high temperature ceramics through the development of an adherent native thermal barrier

Abstract

We present a design concept for developing ZrB2-SiC-AlN composites with enhanced oxidative stability at ultra-high temperatures (~ 2000°C) and low pressures (100 torr). The oxidative stability of these materials arises from a protective silica based scale. However, active oxidation of SiC above 1700°C presents a challenge, which we circumvent through the in-situ growth of a zirconia layer that serves as a thermal barrier, ensuring that the effective temperature at the zirconia/Si rich subscale is less than the active oxidation temperature. The design concept is validated by a series of ultra-high temperature oxidation experiments under static as well as cyclic conditions.

Investigation of the Effect of Supersonic Flow of Dissociated Nitrogen on ZrB2–HfB2–SiC Ceramics Doped with 10 vol.% Carbon Nanotubes

“…The introduction of other modifiers from a number of refractory substances, such as carbides [ 22 , 26 , 27 ] and metal nitrides [ 28 , 29 , 30 ], as well as carbon materials [ 31 , 32 , 33 , 34 ], also has a significant influence on the mechanical characteristics of UHTCs. The use of carbon nanotubes (CNTs) as dopants is of high interest [ 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 ].…”

Oxidation behavior of TiCr and TiMo alloys formed by low-energy pulsed electron beam impact

“…Increase in the high-temperature oxidation resistance of different materials is an important problem in modern material science and applications [1][2][3][4][5]. The real practical conditions usually include the work of products in opened air atmosphere at elevated temperatures when the oxygen diffusion in the near-surface layer is enhanced by a high temperature and provides the changes in structure and phase composition of the material.…”