Phase Relations in the SiC–LaB₆System

Nonoxide High-Melting Point Compounds as Materials for Extreme Conditions

“…Our study of the systems that show promise for development of engineering ceramics has confirmed the existence of a broad range of quasi-binary sections, as described by the eutectic phase diagrams. To identify general interaction trends of the coexisting classes of the high-melting compounds we have reviewed the phase diagrams for many systems: B 4 C-Ме d B 2 [12], SiC-Ме d B 2 [13], SiC-Ме d Si 2 [14,15], Ме d B 2 -Ме d Si 2 [16,17], МеB 6 -Ме d B 2 [18], SiC-МеB 6 [19][20][21], B 4 C-МеB 6 [22,23], МеB 6 -Ме d 2 B 5 [24], Ме d С-Ме d 2 B 5 [25], B 4 C-Me V B 2 [26], B 4 C-W 2 B 5 [27], W 2 B 5 -ZrB 2 [28], etc. Fig.…”

Polythermic Section B4C-LaB6 in the Ternary System La-B-C

“…2), with the eutectic composition containing 70 mol % B 4 C and 30 mol % LaB 6 and having a melting point T eut = 2240 + 20oC. This temperature is higher than T eut in the SiC3LaB 6 system [8], although T mel of B 4 C < T mel of SiC (2450 and 2760oC, respectively). The last result shows that B 4 C has a higher resistance to contact interaction, as already noted in [9] when comparing T eut in the B 4 C3 M d B 2 and SiC3M d B 2 systems, for which an analogous dependence also exists.…”

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

“…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][14][15][16][17][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.…”

“…Ordan'yan et al firstly investigated the phase relations in the LaB6-SiC system and predicted that LaB 6 -SiC eutectic would exhibit attractive physical and mechanical performance. 11 Liu et al reported that the spark plasma sintered (SPS) LaB 6 -60 wt.%SiC composite presented a good ablation resistance due to the molten phases of La 2 Si 2 O 7 and La 2 O 3 on the ablated surface. 19 Moreover, many studies have demonstrated that the variation of the SiC content can seriously affect the microstructure and mechanical property of ZrC-SiC and ZrB 2 -SiC composites.…”

“…Ordan'yan et al. firstly investigated the phase relations in the LaB6‐SiC system and predicted that LaB 6 ‐SiC eutectic would exhibit attractive physical and mechanical performance 11 . Liu et al.…”