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Abstract <p>Ablation tests of ultrahigh-temperature HfB<sub>2</sub> and HfB<sub>2</sub>–SiC based hot-pressed ceramic samples in the air under heating in the flame of a burner fed with a O<sub>2</sub>/C<sub>2</sub>H<sub>2</sub> mixture at a distance of 13 mm to the surface of a sample have demonstrated that HfB<sub>2</sub> ceramic with 30 wt % of SiC additive with a grain size of 30–50 and 5–10 µm and a mass loss of 0.25 mg/s is much more stable (up to 2066–2080°C) as compared to additive-free HfB<sub>2</sub> ceramic cracking at a temperature of 1870°C. Fracture toughness values are comparable for all the studied materials, and the hardness of HfB<sub>2</sub>–SiC composites is slightly higher.</p>

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Ablation Tests of Hot-Pressed Ultrahigh-Temperature HfB2 and HfB2–SiC Ceramic

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • T. O. Prikhna,
  • H. Ünsal,
  • P. P. Barvitskyi,
  • V. E. Moshchil

摘要

Abstract

Ablation tests of ultrahigh-temperature HfB2 and HfB2–SiC based hot-pressed ceramic samples in the air under heating in the flame of a burner fed with a O2/C2H2 mixture at a distance of 13 mm to the surface of a sample have demonstrated that HfB2 ceramic with 30 wt % of SiC additive with a grain size of 30–50 and 5–10 µm and a mass loss of 0.25 mg/s is much more stable (up to 2066–2080°C) as compared to additive-free HfB2 ceramic cracking at a temperature of 1870°C. Fracture toughness values are comparable for all the studied materials, and the hardness of HfB2–SiC composites is slightly higher.