Effect of geometric parameter on thermal stress generation in fabrication process of double-ceramic-layers thermal barrier coating system

Effect of high-content Yttria on the thermal expansion behaviour and ionic conductivity of a stabilised cubic Hafnia

“…Lower emission and higher efficiency aeronautical and aerospace engines are constantly having their temperature capabilities pushed up and cooling fluxes limited to boost performance. Thus, new materials such as Thermal Barrier Coating and Environmental Barrier Coating (TBC/EBC) compositions and designs [1][2][3][4] are developed. Particularly, studies on a greener space propulsion monopropellant have brought an upper range of flame combustion temperatures up to 3000 K with combustion products reaching 15 vol.…”

Study on the structural, mechanical, and dynamical stabilities and properties of Nb2AN (A = Si, Ge, and Sn) MAX phases by first principle

“…The specific method is to evaluate the free energy of different volumes at a certain temperature, calculated by 11 groups of phonons ($$\Delta V/V$$ = 5% and 1% change in the range) in different volumes and then fitted to third‐order Birch–Murnaghan equation of states equation, 65 as shown in Figures S2–S4. The CTEs of the Nb 2 AN (A = Si, Ge, Sn) phases are calculated as shown in Figure 4A and compared with YSZ, 66 protective layer material Al 2 O 3 , 66 bonding layer NiCoCrAlY, 66 and Ni‐based superalloy materials 67 . It can be found that the CTEs of Nb 2 AN (A = Si, Ge, Sn) phase increase with the rise of temperature.…”

“…The CTEs of the Nb 2 AN (A = Si, Ge, Sn) phases are calculated as shown in Figure 4A and compared with YSZ, 66 protective layer material Al 2 O 3 , 66 bonding layer NiCoCrAlY, 66 and Nibased superalloy materials. 67 It can be found that the CTEs SiN is greater than that of Nb 2 GeN and the overall bond strength of Nb 2 GeN is greater than that of Nb 2 SnN. As a matter of common knowledge, the CTE is related to lattice vibration, which is quantized as phonons.…”

“…I G U R E 4 (A) Temperature dependence of the coefficient of thermal expansion of Nb 2 AN (A = Si, Ge, Sn), YSZ,66 α-Al 2 O 3 ,66 NiGoCrAlY,66 and Ni-based alloy 67. (B) Difference in coefficient of thermal expansion compared with Ni-based alloys of Nb 2 AN (A = Si, Ge, Sn) phase increase with the rise of temperature.…”

Computational investigation of porosity effects on fracture behavior of thermal barrier coatings

“…The failure mechanisms discussed above are primarily influenced by the TBC's microstructural features [3,4,5,6] which are governed by processing and spraying parameters [7,8,9,10,11]. In air plasma sprayed TBC, the microstructure is characterized by the presence of splats, pores and pre-existing microcracks, in addition to the presence of irregular and rough interface between the layers.…”