Work

The Thermal Conductivity of Polymer‐Derived Amorphous Si–O–C Compounds and Nano‐Composites

Year: 2015

Type: article

Abstract: Silicon oxycarbide glasses can be produced over a range of Si–O–C compositions by the controlled pyrolysis of polymer precursors. We present measurements of the thermal conductivity of a silicon oxycarbide glass after two different heat treatments and two Si–O–C nano‐composites, hot‐pressed at 1600°C, up to 1000°C and compare them to fused silica, amorphous carbon, and SiC. The temperature dependence of their thermal conductivities is similar to other amorphous materials. The presence of low volume fractions of nanoparticles of hafnia (4.5 v/o) or zirconia (7.4 v/o) dispersed within the amorphous matrix only modifies the conductivity slightly, consistent with a simple Maxwell model, and does not affect the temperature dependence of the thermal conductivity above room temperature.

Source: Journal of the American Ceramic Society

DOI: 10.1111/jace.13947

Authors: Aleksander Gurlo, Emanuel Ionescu, Ralf Riedel, David R. Clarke

Institutions: Technische Universität Darmstadt, Harvard University

Language: English

Topic: Advanced ceramic materials synthesis

Subfield: Ceramics and Composites

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funders: Alexander von Humboldt-Stiftung, Office of Naval Research

Award: G5510470020