Reactive hot-pressing of ZrB2-ZrC-SiC ceramics via direct addition of SiC

Lu, Ying; Zhang, Guojun; Liu, Jixuan; Liu, Hulin; Wang, Xingang; Xu, Fangfang

doi:10.1016/j.ceramint.2016.06.167

Cited by 15 publications

(1 citation statement)

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“…Different methods or technologies have also been invested in order to get perfect and effective SiC coatings including sol‐gel, chemical vapor infiltration, pack cementation, chemical vapor deposition (CVD), metal‐organic chemical vapor deposition, and so on. According to the nuclear material's requirements, additives like B 2 O 3 , B 4 C, Y 2 O 3 , MgO, rare earth oxides, etc . which have been used for densification of the SiC layer in the methods above should be eliminated to ppb level in nuclear reactor core.…”

Section: Introductionmentioning

confidence: 99%

Dual layer SiC coating on matrix graphite sphere prepared by pack cementation and fluidized‐bed chemical vapor deposition

et al. 2017

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A dual layer silicon carbide (SiC) coating including inner porous SiC (p-SiC) layer and outer dense SiC (d-SiC) layer was fabricated on the matrix graphite (MG) spheres of high-temperature gas-cooled reactor fuel elements by pack cementation and fluidized-bed chemical vapor deposition process to improve the oxidation-resistant property. Microstructure of the coating demonstrates different density and structure of the two SiC layers with no obvious boundaries between them. Weight gain curves of oxidation tests at 1773 K for 200 hours show that the coating could effectively protected the MG sphere by isolating the air infiltration with p-SiC layer as the main functional layer and d-SiC layer as the transition layer to improve the bond strength. Due to the transition function of p-SiC layer, the coated spheres could understand more than 50 times thermal shocking tests from 1773 K to room temperature with no stress cracking.

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Section: Introductionmentioning

confidence: 99%