Fabrication and characterisation of ZrSi2 ceramics via reactive hot-pressing

Yasith Chameendra Jayakody Mudiyanselage, Karthik Ramachandran, Doni Daniel Jayaseelan

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

ZrSi 2 was fabricated via reactive hot-pressing technique for 45 min at 1250°C and 1350°C, respectively. The hot-pressed sample exhibited Vickers hardness of 10.93 ± 0.32 GPa and indentation fracture toughness of 3.16 ± 0.54 MPa.m 1/2. Thermal conductivity (RT-2.99 W (m.K) −1) and diffusivity (RT–18.2 mm 2 s −1) of the sample decreased with increasing temperature due to phonon scattering. Oxidation studies were carried out for the hot-pressed samples from 1000°C to 1200°C for 5, 48 and 100 h in air. The oxidation test results showed that ZrSi 2 followed selective oxidation with Si diffusing into the oxide layers at high temperatures. At 1200°C, the surface of ZrSi 2 oxidised completely to form a high-temperature stable phase, zircon (ZrSiO 4). The autoclave test at 250°C and 250 bar shown negligible mass gain (∼0.022 g) which suggests the usage of ZrSi 2 for nuclear fuel cladding applications.

Original languageEnglish
Pages (from-to)166-176
Number of pages11
JournalAdvances in Applied Ceramics
Volume121
Issue number5-8
Early online date3 Nov 2022
DOIs
Publication statusPublished - 17 Nov 2022

Keywords

  • Autoclave test
  • Fracture toughness
  • Oxidation
  • Thermal properties
  • ZrSi

ASJC Scopus subject areas

  • Ceramics and Composites
  • Industrial and Manufacturing Engineering

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