Improvement of oxidation resistance of SiC/C (graphite) composites by silicon infiltration in surface

  • Hongwei Li
  • , Qin Zhang
  • , Zhihao Jin
  • , Jiping Wang
  • , Haiyun Jin

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

SiC/C (graphite) composite ceramics with 20vol% flake graphite were fabricated by Plasma Activated Sintering (PAS) firstly; the composites treated by silicon infiltration in surface were oxidized from 800°C to 1500°C. Effect of silicon infiltration on the oxidation resistance of SiC/C (graphite) composites was characterized by TG/DTA, SEM and XRD. The results show that the graphite in surface of composites reacted with silicon to form a dense SiC film about 30μm-in-thickness. The oxidation resistance temperature was increased from 600°C to 1300°C. Below 1300°C, the surface of composites by silicon filtration was oxidized to form a dense continuous oxide film to hider the oxidation of graphite in matrix. At 1500°C, the surface oxide film was heavy damaged, and many micropores were produced; inner graphite was oxidized above 1300°C again.

Original languageEnglish
Title of host publicationEco-Materials Processing and Design XI, ISEPD-11
PublisherTrans Tech Publications Ltd
Pages384-387
Number of pages4
ISBN (Print)0878492445, 9780878492442
DOIs
StatePublished - 2010

Publication series

NameMaterials Science Forum
Volume658
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Keywords

  • Antioxidation
  • Graphite
  • SiC
  • Silicon infiltration

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