Low temperature synthesis of pure phase TaB2 powders and its oxidation protection modification behaviors for Si-based ceramic coating in dynamic oxidation environments

et al. 2020

J Adv Ceram

Self Cite

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.

Section: Resultsmentioning

confidence: 93%

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

Self Cite

“…10(b), the magnification of Fig. 10(a), shows the existence of the Ta-oxides aggregate structure which is incapable of greatly improving the stability of the glass layer [38]. In contrast, a novel phenomenon that more SiO 2 glass phase was generated on the coating with MoSi 2 modified can be observed from Fig.…”

Section: Resultsmentioning

confidence: 93%

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

et al. 2020

Preprint

Self Cite

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.

“…10(b), the magni cation of Fig. 10(a), shows the existence of the Ta-oxides aggregate structure which is incapable of greatly improving the stability of the glass layer [38]. In contrast, a novel phenomenon that more SiO 2 glass phase was generated on the coating with MoSi 2 modi ed can be observed from Fig.…”

Section: Resultsmentioning

confidence: 94%

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

et al. 2020

Preprint

Self Cite

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.