The peculiarities in oxidation behavior of the ZrB2-SiC ceramics with chromium additive

D. Bannykh, A. Utkin, N. Baklanova

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

ZrB2-SiC-Cr powder sintering at 1600 °C and its oxidation behavior at 1000–1500 °C in air were studied as a function of chromium content. It was shown that the relative density of the ZrB2-SiC ceramics increases with an increase in chromium content in the powdered mixture. This is related to the formation of the liquid Cr-Si-C-B phase during the high-temperature interaction of SiC with chromium and ZrB2. It was stated that the mechanism of ZrB2-SiC-Cr ceramics oxidation is changed from bulk to passive. The oxidation resistance is improved for the ceramics with 13% of chromium or less, which can be explained by a decrease in its porosity. The ceramics with higher chromium content demonstrates the opposite effect, namely, large-size Cr2O3 crystals are formed during oxidation, this promotes microcracking in the oxidizing layer and causes damage of surface integrity. As a result, the oxidation resistance of the ZrB2-SiC-Cr ceramics with high chromium content is decreased.

Original languageEnglish
Article number105023
Number of pages8
JournalInternational Journal of Refractory Metals and Hard Materials
Volume84
DOIs
Publication statusPublished - 1 Nov 2019

Keywords

  • Borides
  • Chromium
  • Oxidation
  • Silicon carbide
  • Sintering
  • Thermal properties
  • DENSIFICATION
  • TEMPERATURE
  • KINETICS
  • MICROSTRUCTURE
  • HFB2

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