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Teselko, Petro
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article
Reaction Sintering of Machinable TiB2-BN-C Ceramics with In-Situ Formed h-BN Nanostructure
Abstract
<p>Soft TiB<sub>2</sub>-BN-C hetero-modulus ceramics were sintered with the assistance of in-situ reactions during the hot pressing of TiN-B<sub>4</sub> C precursors. TiB<sub>2</sub> formation was observed already after the hot pressing at 1100<sup>◦</sup> C, remaining the only phase identifiable by XRD even after sintering at 1500<sup>◦</sup> C. Analysis of reaction kinetics allows us to assume that the most probable reaction controlling stage is boron atoms sublimation and gas phase transfer from B<sub>4</sub> C to TiN. Reactive sintering route allows almost full densification of TiB<sub>2</sub>-BN-C composite ceramics at 1900<sup>◦</sup> C. The processes enable the formation of multilayer h-BN nanosheets inside the TiB<sub>2</sub> matrix. The manufactured TiB<sub>2</sub>-33BN-13C ceramic with K<sub>1C</sub> = 5.3 MPa·m<sup>1/2</sup> and H<sub>V</sub> = 1.6 GPa is extremely thermal shock-resistant at least up to quenching temperature differential of 800<sup>◦</sup> C. The sintered UHTC composite can be machined into complex geometry components.</p>