Sintering, mechanical, electrical and oxidation properties of ceramic intermetallic TiC-Ti3Al composites from nano-TiC particles

Zhezhen Fu, Kanchan Mondai, Rasit Koc

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The paper discusses the development of a new material system for interconnect application in Solid Oxide Fuel Cells (SOFC) based on TiC-Ti3Al. Nano-size TiC powders utilized in this research were synthesized using carbon coated TiO2 precursors from a patented process. The pressureless sintering of TiC-Ti3Al in vacuum was applied at temperatures between 1300-1500°C and content of Ti3 Al was varied in the range of 10-40 wt %. XRD and SEM were used for phase evaluation and sintering behavior. Relative density increased markedly with increasing sintering temperature because of grain growth and formation of Ti3AlC2 secondary phase. Dense products (>95% TD) were synthesized from nanosized TiC powders with 10 and 20 wt. % Ti3Al, but with about 8 to 10% porosity for 30 and 40 wt. % Ti3Al. The mechanical properties were determined from Vickers hardness and fracture toughness calculations. Vickers hardness decreased and fracture toughness increased with increasing Ti3Al content. The electrical conductivity and oxidation behavior of TiC-Ti3Al composites were investigated to evaluate the feasibility for SOFC interconnect application. The electrical conductivity measurements in air at 800 °C for 100 hours were made using Kelvin Method 4 wire 2 point method.

Original languageEnglish (US)
Title of host publicationAdvances in Solid Oxide Fuel Cells and Electronic Ceramics - A Collection of Papers Presented at the 39th International Conference on Advanced Ceramics and Composites
EditorsMihails Kusnezoff, Kiyoshi Shimamura, Narottam P. Bansal
PublisherAmerican Ceramic Society
Pages31-43
Number of pages13
Edition3
ISBN (Print)9781119040439
StatePublished - 2016
Event12th International Symposium on Solid Oxide Fuel Cells: Materials, Science and Technology, SOFC 2015 and a Focused Session: Single Crystalline Materials for Electrical, Optical and Medical Applications - 39th International Conference on Advanced Ceramics and Composites, ICACC 2015 - Daytona Beach, United States
Duration: Jan 25 2015Jan 30 2015

Publication series

NameCeramic Engineering and Science Proceedings
Number3
Volume36
ISSN (Print)0196-6219

Conference

Conference12th International Symposium on Solid Oxide Fuel Cells: Materials, Science and Technology, SOFC 2015 and a Focused Session: Single Crystalline Materials for Electrical, Optical and Medical Applications - 39th International Conference on Advanced Ceramics and Composites, ICACC 2015
Country/TerritoryUnited States
CityDaytona Beach
Period1/25/151/30/15

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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