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

Journal Article · 15 June 2019 · Journal of the European Ceramic Society

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

Yang, Ni ^[1]; Lu, Kathy  ^[1]

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1. 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.

• Research Organization: Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
• Sponsoring Organization: USDOE Office of Nuclear Energy (NE); National Science Foundation (NSF); USDOE
• Grant/Contract Number: NE0008807; CMMI-1634325
• OSTI ID: 1801301
• Alternate ID(s): OSTI ID: 1531022
• Journal Information: Journal of the European Ceramic Society, Vol. 39, Issue 14; ISSN 0955-2219
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English