Influence of carbon content on the fabrication of ZrB2-SiC-YSi2 ultra-high temperature ceramics via reactive melt infiltration

Binghui Zhang, Yongsheng Liu, Yunlei Lv, Shaolin Fu, Xiaokun Sun, Yejie Cao, Ning Dong, Jianyong Tu

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

To address the requirements for reusable thermal protection materials, ZrB2-SiC-YSi2 ceramics were developed for the first time using the reactive melt infiltration (RMI) technique. This study systematically examines the influence of carbon content on the densification and microstructural of ZrB2-SiC-YSi2 ceramics. The results demonstrate that with increasing carbon content, the bulk density initially increases and then decreases, while the open porosity decreases initially before rising. The maximum density of the ceramics is 3.80 g/cm³ and the open porosity is as low as 0.17 % when the graphite carbon content is 20 wt%. Further analysis of densification behavior and phase morphology showed that the residual Si ratio of ZSY-2 specimen decreased from 10 % to about 4.2 %, while the SiC ratio increased from 24.6 % to 29.8 %. The primary phases present in the ZrB2-SiC-YSi2 ceramics synthesized via the RMI process include ZrB2, YSi2, and SiC, with minor phases of Y5Si3C and free Si detected. Finally, the oxidation behavior of ZrB2-SiC-YSi2 ceramics at an oxidation temperature of 1550 °C was verified. Its main oxidation products are ZrO2, Y2O3, SiO2, ZrSiO4, Y2Si2O7, and yttrium silicate phase with excellent oxidation resistance is determined to be generated. These advantages demonstrate the significant potential of the RMI process in advancing the fabrication of ultra-high-temperature ceramics.

Original languageEnglish
Pages (from-to)55438-55448
Number of pages11
JournalCeramics International
Volume50
Issue number24
DOIs
StatePublished - 15 Dec 2024

Keywords

  • Carbon content
  • Densification
  • Microstructural
  • Reactive melt infiltration
  • ZrB-SiC-YSi ceramics

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