Thermophysical property and electrical conductivity of titanium isopropoxide – polysiloxane derived ceramics

Yang, Ni; Lu, Kathy

doi:10.1016/j.jeurceramsoc.2019.06.020

Thermophysical property and electrical conductivity of titanium isopropoxide – polysiloxane derived ceramics

Journal Article · Sat Jun 15 00:00:00 EDT 2019 · Journal of the European Ceramic Society

DOI:https://doi.org/10.1016/j.jeurceramsoc.2019.06.020· OSTI ID:1801301

Yang, Ni ^[1]; ^[2]

Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States); OSTI
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)

In this work, high temperature resistant Si-O-C-Ti has been successfully prepared based on the pyrolysis of polysiloxane (PSO) and titanium (IV) isopropoxide (TTIP) at 1200–1400 °C. PSO can homogeneously mix with TTIP to enhance its conversion to TiC. The carbothermal reactions between TiO₂ (product of thermal decomposition of TTIP) and carbon result in the formation of TiC. All the Si-O-C-Ti composites pyrolyzed at 1200–1300 °C are stable up to 1000 °C in an oxidizing air atmosphere. TiC leads to high electrical conductivity at elevated temperatures; the maximum conductivity is 1176.55 S/m at 950 °C, which is the first reported value of >1000 S/m conductivity for Si-O-C-Ti ceramics. However, too high a pyrolysis temperature, such as 1400 °C, can potentially ‘destabilize’ the Si-O-C-Ti system by consuming the free carbon and result in lower conductivities.

View Accepted Manuscript (DOE)

Research Organization:: Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: NE0008807

OSTI ID:: 1801301

Alternate ID(s):: OSTI ID: 1531022

Journal Information:: Journal of the European Ceramic Society, Journal Name: Journal of the European Ceramic Society Journal Issue: 14 Vol. 39; ISSN 0955-2219

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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