Reaction Sintering of Machinable TiB2-BN-C Ceramics with In-Situ Formed h-BN Nanostructure

Oleksii Popov, Dmitry V. Shtansky, Vladimir Vishnyakov, Oleksandra Klepko, Sergey Polishchuk, Magzhan K. Kutzhanov, Elizaveta S. Permyakova, Petro Teselko

Research output: Contribution to journalArticlepeer-review

Abstract

Soft TiB2-BN-C hetero-modulus ceramics were sintered with the assistance of in-situ reactions during the hot pressing of TiN-B4 C precursors. TiB2 formation was observed already after the hot pressing at 1100 C, remaining the only phase identifiable by XRD even after sintering at 1500 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 B4 C to TiN. Reactive sintering route allows almost full densification of TiB2-BN-C composite ceramics at 1900 C. The processes enable the formation of multilayer h-BN nanosheets inside the TiB2 matrix. The manufactured TiB2-33BN-13C ceramic with K1C = 5.3 MPa·m1/2 and HV = 1.6 GPa is extremely thermal shock-resistant at least up to quenching temperature differential of 800 C. The sintered UHTC composite can be machined into complex geometry components.

Original languageEnglish
Article number1379
Number of pages15
JournalNanomaterials
Volume12
Issue number8
DOIs
Publication statusPublished - 2 Apr 2022

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