The oxidation behavior of high-temperature aluminides

Abstract

Author's Note: All compositions are given in atomic percent unless otherwise indicated.The kinetics and mechanisms of oxidelayer formation on Ti-Al-X alloys, specifically have been studied. The activation energies for the oxide formation of each of the alloys used in this work were determined, and the values obtained were compared with those obtained by other researchers for identical alloys.

High-Temperature Oxidation Behavior of Elemental Powder Metallurgy Processed TiAl-Mn-Mo-C Alloys with Yttrium Addition

“…The performance of TiAl-based alloys as new structural materials depends strongly on their oxidation resistance. 1) Inadequate oxidation resistance limits the use of current TiAl-based alloys above about 800 C, however, because the external layer formed on the substrates is not a protective Al 2 O 3 scale, but a TiO 2 scale or a mixture of these two oxides.…”

High temperature oxidation of chromium nitrides

“…2(b). The obtained k p values of the sintered pure CrN are comparable to those of CrN coatings [2,6,7], but they are lower than those of Cr 2 O 3 -forming kinetics [8].…”

“…4(a), (c) and (e) were about 3.7, 14.7, and 15.2 μm, respectively. Relatively thick, but adherent scales were formed at 1100 o C. The oxide scales formed progressively became denser and the oxide layer-matrix phase boundaries became more distinct, as the Temperature dependence of the parabolic rate constants of the sintered pure CrN powders, Cr2O3-forming kinetics [8], and CrN coatings [2,6,7] in air. scales thickened.…”

“…2(a) were fitted to an equation, ΔW 2 =k p t, where ΔW was the weight gain per unit area, t was the oxidation time, and k p was the parabolic rate constant. The k p values of the prepared specimens were compared with other published data [2,[6][7][8], as shown in Fig. 2(b).…”

Effects of Ti on High Temperature Oxidation of Ni-Based Superalloys

“…때는 그렇지 않은 경우에 비하여 우수한 산화 저항성을 갖는 다고 많은 연구자들이 보고해왔다 [22][23][24] . 또한, NiCr 2 O 4 와 같은 복합 산화물을 형성하는 경우에는 상대적으로 내산화성이 저하되는 것으로 알려져 있다 25,26) .…”