Effects of LaB6 on composition, microstructure and ablation property of the HfC-TaC-SiC doped C/C composites prepared by precursor infiltration and pyrolysis

Fang, Cunqian; Huang, Baoyu; Yang, Xin; Ai, Shi; Zhang, Ze; Yi, Jinren; Huang, Qizhong

doi:10.1016/j.corsci.2021.109347

Cited by 26 publications

(1 citation statement)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Besides, LaB 6 has the special cubic structure with B 6 octahedral structure surrounding the La atoms, giving LaB 6 metallic characterization with high current density and good machining performance 10 . The studies demonstrated that the addition of SiC can enhance the hardness of LaB 6, 11,12 on the other hand, LaB 6 could further enhance the oxidation and ablation resistance of SiC‐based composite by forming the thermodynamically stable phase of lanthanum oxide (La 2 O 3 and La 2 Si 2 O 7 ) 13–18 . Therefore, the use of LaB 6 and SiC ceramics in composite can combine the advantages of the composed phases as well as improve the mutual performance, which indicates that LaB 6 ‐SiC composite can be used as a promising high‐temperature functional and structural ceramic applying in high‐tech area like rocket nozzles and cathode material and so forth.…”

Section: Introductionmentioning

confidence: 99%

The densification behavior, microstructure, mechanical, and thermionic emission properties of LaB6‐SiC composite

Yang,

Zhao,

Wang

et al. 2023

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

The LaB6‐SiC composite with the different SiC content (0, 15, 30, 36, 50, 90, and 100 wt.%,) was densified by spark plasma sintering. The effects of SiC content on the densification behavior, microstructure, mechanical, and thermionic emission properties of LaB6‐SiC composite were systemically investigated. The results show that all the rapid shrinkage occurred at the heating stage during densification, and LaB6‐36 wt.%SiC composite owned the maximum shrinkage rate of 1.5 mm/min at T = 1798oC. The highest relative density of the composite decreased from 98.18% to 95.01% as the SiC content increased from 15 wt.% to 90 wt.%, under which the morphology of LaB6 grain evaluated from the equiaxed to elongated structure, and LaB6 grain size varied in the range of 5.05–11.42 μm. The similar eutectic structures were observed in the LaB6‐36 wt.% SiC composite because of some LaB6 grains melting. Both the highest fracture toughness of 5.15 ± 0.56 MPa.m1/2 and the highest bending strength of 313 ± 4.7 MPa belonged to the LaB6‐36 wt.% SiC composite, which also exhibited thermionic emission current density of 10.74 A/cm2 and work function of 2.99 eV at T = 1873 K.

show abstract

Section: Introductionmentioning

confidence: 99%