Improving the oxidation resistance of Cr-Si-based alloys by ternary alloying

Microstructure and properties of refractory high entropy alloys containing Si and Cr

“…Figure 5. The result seems inconsistent with related reports such as that Cr addition improves the oxidation resistance of some refractory metals and alloys[22].…”

Oxidation resistance of ZrB2‐based monoliths using polymer‐derived Si(Zr,B)CN as sintering aid

“…ZrB 2 /SiCN shows the lowest mass gain of all three materials with only a small linear mass change ( k v = −0.9·10 −8 g cm −2 s −1 ). Interestingly, a negative value for k v is observed for ZrB 2 /SiCN and ZrB 2 /SiZrBCN ( k v = −0.9·10 −8 g cm −2 s −1 and k v = −3.6·10 −8 g cm −2 s −1 ) indicating a total change in oxidation kinetics compared to the typical paralinear oxidation behavior 32 . This is explained by a rather linear mass gain instead of mass loss as is described in detail earlier.…”

“…Interestingly, a negative value for k v is observed for ZrB 2 /SiCN and ZrB 2 /SiZrBCN (k v = −0.9⋅10 −8 g cm −2 s −1 and k v = −3.6⋅10 −8 g cm −2 s −1 ) indicating a total change in oxidation kinetics compared to the typical paralinear oxidation behavior. 32 This is explained by a rather linear mass gain instead of mass loss as is described in detail earlier. With the addition of Zr and B into the material (ZrB 2 /SiZrBCN), the portion of the linear mass change was found to have increased, which leads to the highest mass gain of all three materials after 50 h at 1300 • C (14.60 mg cm −2 ).…”

Microstructure and Oxidation Resistance of Cr–Al–Si Alloys for High-Temperature Applications

“…The demand for alloys that surpass the high-temperature properties of Ni-based superalloys is steadily increasing as the operation temperature of high-temperature components increases. It is a refractory-based alloy having a melting point higher than 1900 • C that is promising as an alternative metallic material [1]. Especially since Cr and Cr-Al alloys are excellent in high temperature oxidation resistance, they are suitable as materials for high-temperature components or oxidation-resistant coating, and related research has been conducted [2][3][4][5][6][7][8].…”

“…Thermodynamically, SiO 2 is more stable than Cr 2 O 3 , but Cr oxide can be formed predominately due to a higher activity and faster diffusion in Cr phase. The addition of Si to Cr has been known to improve the oxidation resistance [1]. The formation of Al 2 O 3 on the surface of Cr alloys through the addition of aluminum may be also desirable depending on the conditions of use of the material.…”