Nanowire-toughened transition layer to improve the oxidation resistance of SiC–MoSi2–ZrB2 coating for C/C composites

et al. 2020

Preprint

TaB2-SiC coating modified by different content of MoSi2 was fabricated on graphite substrate with SiC inner coating by liquid phase sintering to elevate the anti-oxidation capability of the TaB2-SiC coatings. As compared to the sample with the TaB2-40wt.%SiC coating, the coating sample modified with MoSi2 exhibited a weight gain trend at lower temperatures, the fastest weight loss rate went down by 76%, and the relative oxygen permeability value reduced from about 1% to near 0. More importantly, the large amount of SiO2 glass phase produced over the coating during oxidation was in contact with the modification of MoSi2 , which was proved to be beneficial to the dispersion of Ta-oxides. A concomitantly formed continuous Ta-Si-O-B compound glass layer showed excellent capacity to prevent oxygen penetration. However, when the TaB2 content was sacrificed to increase the MoSi2 content, the relative oxygen permeability of the coating increased instead of decreased. Thus, on the basis of ample TaB2 content, increasing the MoSi2 content of the coating is conducive to reducing the relative oxygen permeability of the coatings in a broad temperature region.

Section: Wu Et Al [27] Fabricated a Mosi 2 -Based Coating Composed Omentioning

confidence: 99%

Influence of MoSi2 on oxidation protective ability of TaB2-SiC coating in oxygen-containing environments within a broad temperature range

et al. 2020

Preprint

“…At the moment, because of the fact that MoSi 2 possesses superior anti-oxidation performance, MoSi 2added UHTC coatings, such as the ZrB 2 -MoSi 2 -SiC coating [30][31][32] and the HfB 2 -MoSi 2 -SiC coating [33], have attracted lots of attention. Yet, until now, few studies have been able to elaborate the unique role of MoSi 2 in multiphase coating.…”

Section: Introduction mentioning

confidence: 99%

Influence of MoSi2 on oxidation protective ability of TaB2-SiC coating in oxygen-containing environments within a broad temperature range

et al. 2020

J Adv Ceram

TaB 2-SiC coating modified by different content of MoSi 2 was fabricated on graphite substrate with SiC inner coating by liquid phase sintering to elevate the anti-oxidation capability of the TaB 2-SiC coatings. As compared to the sample with the TaB 2-40wt%SiC coating, the coating sample modified with MoSi 2 exhibited a weight gain trend at lower temperatures, the fastest weight loss rate went down by 76%, and the relative oxygen permeability value reduced from about 1% to near 0. More importantly, the large amount of SiO 2 glass phase produced over the coating during oxidation was in contact with the modification of MoSi 2 , which was proved to be beneficial to the dispersion of Ta-oxides. A concomitantly formed continuous Ta-Si-O-B compound glass layer showed excellent capacity to prevent oxygen penetration. However, when the TaB 2 content was sacrificed to increase the MoSi 2 content, the relative oxygen permeability of the coating increased instead of decreased. Thus, on the basis of ample TaB 2 content, increasing the MoSi 2 content of the coating is conducive to reducing the relative oxygen permeability of the coatings in a broad temperature region.

“…At the moment, because of the fact that MoSi 2 possesses superior anti-oxidation performance, MoSi 2 -added UHTC coatings, such as the ZrB 2 -MoSi 2 -SiC coating [30][31][32] In addition, in order to synthesis the coatings that can provide long-term protection for carbon materials, the liquid phase sintering method has been widely applied in our previous work [34], which is an ideal method because the content of various components in the coatings can be adjusted so that a coating with better oxidation resistance is available. Likewise, in this paper, the coatings were synthesized by the combination of liquid phase sintering and in-situ reaction, and partial SiC was obtained by in-situ reaction between Si and C.…”

Section: Introductionmentioning

confidence: 99%

Influence of MoSi2 on oxidation protective ability of TaB2-SiC coating in oxygen-containing environments within a broad temperature range

et al. 2020

Preprint

TaB2-SiC coating modified by different content of MoSi2 was fabricated on graphite substrate with SiC inner coating by liquid phase sintering to elevate the anti-oxidation capability of the TaB2-SiC coatings. As compared to the sample with the TaB2-40wt.%SiC coating, the coating sample modified with MoSi2 exhibited a weight gain trend at lower temperatures, the fastest weight loss rate went down by 76%, and the relative oxygen permeability value reduced from about 1% to near 0. More importantly, the large amount of SiO2 glass phase produced over the coating during oxidation was in contact with the modification of MoSi2, which was proved to be beneficial to the dispersion of Ta-oxides. A concomitantly formed continuous Ta-Si-O-B compound glass layer showed excellent capacity to prevent oxygen penetration. However, when the TaB2 content was sacrificed to increase the MoSi2 content, the relative oxygen permeability of the coating increased instead of decreased. Thus, on the basis of ample TaB2 content, increasing the MoSi2 content of the coating is conducive to reducing the relative oxygen permeability of the coatings in a broad temperature region.