Thermal conductivity and thermal shock resistance of TiB2-based UHTCs enhanced by graphite platelets

O. Popov; T. Avramenko; V. Vishnyakov

doi:10.1016/j.mtcomm.2020.101756

Thermal conductivity and thermal shock resistance of TiB₂-based UHTCs enhanced by graphite platelets

O. Popov, T. Avramenko, V. Vishnyakov

Research output: Contribution to journal › Article › peer-review

31 Citations (Scopus)

Abstract

TiB₂-SiC-C and TiB₂-TiC-C heteromodulus ceramics were sintered by reactive hot pressing of TiC-B₄C-Si and TiC-B₄C precursors at 1830 °C and 30 MPa. Sintering time at the maximum temperature was between 2 and 8 min. The reactions in TiC-B₄C-Si green body create submicron (100–400 nm) TiB₂ crystals inside silicon carbide grains as well as B_xSi_yC_z nanofibers, which nucleate near SiC surfaces. Low hardness graphite platelets are formed within the hard matrix during the in-situ exothermic reaction. “Soft-hard” grain combination produces substantially improved fracture toughness (up to 9 MPa m^1/2). The materials also demonstrate high thermal conductivity (up to 120 W/m∙K) and high thermal shock resistance. The thermal shock crack growth is arrested by the graphite platelets.

Original language	English
Article number	101756
Number of pages	8
Journal	Materials Today Communications
Volume	26
Early online date	8 Oct 2020
DOIs	https://doi.org/10.1016/j.mtcomm.2020.101756
Publication status	Published - 1 Mar 2021

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SDG 9 Industry, Innovation, and Infrastructure

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VV-Thermal shock article final submittedAccepted author manuscript, 1.7 MB

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title = "Thermal conductivity and thermal shock resistance of TiB2-based UHTCs enhanced by graphite platelets",

abstract = "TiB2-SiC-C and TiB2-TiC-C heteromodulus ceramics were sintered by reactive hot pressing of TiC-B4C-Si and TiC-B4C precursors at 1830 °C and 30 MPa. Sintering time at the maximum temperature was between 2 and 8 min. The reactions in TiC-B4C-Si green body create submicron (100–400 nm) TiB2 crystals inside silicon carbide grains as well as BxSiyCz nanofibers, which nucleate near SiC surfaces. Low hardness graphite platelets are formed within the hard matrix during the in-situ exothermic reaction. “Soft-hard” grain combination produces substantially improved fracture toughness (up to 9 MPa m1/2). The materials also demonstrate high thermal conductivity (up to 120 W/m∙K) and high thermal shock resistance. The thermal shock crack growth is arrested by the graphite platelets.",

keywords = "Crack resistance, Heteromodulus ceramics, Reactive sintering, Silicon carbide, Thermal conductivity, Thermal shock resistance, Titanium diboride, Toughness",

author = "O. Popov and T. Avramenko and V. Vishnyakov",

year = "2021",

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doi = "10.1016/j.mtcomm.2020.101756",

language = "English",

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T1 - Thermal conductivity and thermal shock resistance of TiB2-based UHTCs enhanced by graphite platelets

AU - Popov, O.

AU - Avramenko, T.

AU - Vishnyakov, V.

PY - 2021/3/1

Y1 - 2021/3/1

N2 - TiB2-SiC-C and TiB2-TiC-C heteromodulus ceramics were sintered by reactive hot pressing of TiC-B4C-Si and TiC-B4C precursors at 1830 °C and 30 MPa. Sintering time at the maximum temperature was between 2 and 8 min. The reactions in TiC-B4C-Si green body create submicron (100–400 nm) TiB2 crystals inside silicon carbide grains as well as BxSiyCz nanofibers, which nucleate near SiC surfaces. Low hardness graphite platelets are formed within the hard matrix during the in-situ exothermic reaction. “Soft-hard” grain combination produces substantially improved fracture toughness (up to 9 MPa m1/2). The materials also demonstrate high thermal conductivity (up to 120 W/m∙K) and high thermal shock resistance. The thermal shock crack growth is arrested by the graphite platelets.

AB - TiB2-SiC-C and TiB2-TiC-C heteromodulus ceramics were sintered by reactive hot pressing of TiC-B4C-Si and TiC-B4C precursors at 1830 °C and 30 MPa. Sintering time at the maximum temperature was between 2 and 8 min. The reactions in TiC-B4C-Si green body create submicron (100–400 nm) TiB2 crystals inside silicon carbide grains as well as BxSiyCz nanofibers, which nucleate near SiC surfaces. Low hardness graphite platelets are formed within the hard matrix during the in-situ exothermic reaction. “Soft-hard” grain combination produces substantially improved fracture toughness (up to 9 MPa m1/2). The materials also demonstrate high thermal conductivity (up to 120 W/m∙K) and high thermal shock resistance. The thermal shock crack growth is arrested by the graphite platelets.

KW - Crack resistance

KW - Heteromodulus ceramics

KW - Reactive sintering

KW - Silicon carbide

KW - Thermal conductivity

KW - Thermal shock resistance

KW - Titanium diboride

KW - Toughness

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DO - 10.1016/j.mtcomm.2020.101756

M3 - Article

AN - SCOPUS:85094152590

SN - 2352-4928

VL - 26

JO - Materials Today Communications

JF - Materials Today Communications

M1 - 101756

ER -

Thermal conductivity and thermal shock resistance of TiB₂-based UHTCs enhanced by graphite platelets

Abstract

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