Deuterium permeation behavior through yttria-stabilized zirconia coating fabricated by magnetron sputtering

Hydrogen Isotope Permeation Behavior of AlCrFeTiNb, AlCrMoNbZr and AlCrFeMoTi High-Entropy Alloys Coatings

“…It indicates that the deuterium permeability of the HEA coating should be further improved by optimizing the structure and composition. We also observed a slight decrease of the deuterium ion current for AlCrMoNbZr and AlCrFeMoTi coatings at a temperature of 600 °C with D2 pressure of 30 kPa, as shown in Figure 1c, which attributes to crystallization [26,27] and a trap site effect [28]. Compared with AlCrFeTiNb and AlCrMoNbZr, the AlCrFeMoTi coating had a much lower deuterium ion current intensity under all different testing conditions, which indicates that the AlCrFeMoTi coating has a better deuterium permeation resistance.…”

Effect of Cr2O3 nanosheet insertion on the deuterium permeation behavior of a Cr-Zr-O coating

“…The fitting curve of the driven pressure and permeation flux is shown in figure 8(a). The pressure exponent at different temperatures is near to 1.0, which indicates that the D 2 permeation in a coated sample is a surface-limited process [6].…”

“…As shown in figure 6, when the concentration of NSs reaches 1.0 g l −1 , the signals of the (1 0 1) and (1 2 1) peaks become more obvious, which indicates that the crystallinity of tetragonal ZrO 2 in the coating is improved [27]. The XRD results indicate that nanocrystal tetragonal ZrO 2 is formed inside the amorphous ZrO 2 layer [4][5][6], which may affect the permeation resistance of the coating.…”

“…A ceramic coating is a type of effective TPB. Aluminum oxide (Al 2 O 3 ) coatings [1][2][3], zirconia (ZrO 2 ) [4][5][6] and erbium oxide (Er 2 O 3 ) [7,8] are all potential TPB materials. However, with the exception of tetragonal ZrO 2 , which has a thermal expansion coefficient of 9.0×10 −6 -10.0×10 −6 K −1 at 400 °C, and the closer thermal expansion coefficient of austenitic alloys (nearly 17.2×10 −6 -17.9×10 −6 K −1 at 400 °C (referring to 321 steel)) [9,10], alternative TPB materials, such as Al 2 O 3 and Cr 2 O 3 , usually have poorer thermal expansion coefficients (8.0×10 −6 -8.8×10 −6 K −1 and 7.0×10 −6 -7.3×10 −6 K −1 at 400 °C [1][2][3]11]) compared with austenitic steel substrates.…”

“…The most important factor of this method is that it is adjustable, which means both the type of metal source and the ratio of metal ions in the sol can be adjusted. However, as the thickness of the sol-gel coating increases, defects, cracks and even holes will appear [6]. For applications such as TPB, defects in the coating will deteriorate its performance substantially.…”