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Si-B-C-N monoliths with 5wt% LaB6 additives were prepared by spark plasma sintering at 1250–2000°C and 50MPa using a mechanically alloyed mixture of graphite, c-Si, h-BN and LaB6 powders as the starting materials. Microstructural evolution, mechanical and thermal properties of the as-prepared La/Si-B-C-N monoliths were investigated. The densification of the ceramics starts at 1160° and ends at 1800°C...
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