Impact of a Supersonic Dissociated Air Flow on the Surface of HfB2–30 vol % SiC UHTC Produced by the Sol–Gel Method


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Abstract

A new method to produce ultra-high-temperature ceramic composites under rather mild conditions (1700°C, 30 MPa, treatment time 15 min) was applied to synthesize a relatively dense (ρrel = 84.5%) HfB2–30 vol % SiC material containing nanocrystalline silicon carbide (average crystallite size ∼37 nm). The elemental and phase compositions, microstructure, and some mechanical properties of this material and also its thermal behavior in an air flow within the temperature range 20–1400°C were investigated. Using a high-frequency induction plasmatron, a study was made of the effect of a supersonic dissociated air flow on the surface of the produced ultra-high-temperature ceramic composite shaped as a flat-end cylindrical sample installed into a copper water-cooled holder. On 40-min exposure of the sample to the supersonic dissociated air flow, the sample did not fail, and the weight loss was 0.04%. Although the heat flux was high, the temperature on the surface did not exceed 1400–1590°C, which could be due to the heat transfer from the sample to the water-cooled model. The thickness of the oxidized layer under these conditions was 10–20 μm; no SiC-depleted region formed. Specific features of the microstructure of the oxidized surface layer of the sample were noted.

About the authors

E. P. Simonenko

Kurnakov Institute of General and Inorganic Chemistry

Author for correspondence.
Email: ep_simonenko@mail.ru
Russian Federation, Moscow, 119991

N. P. Simonenko

Kurnakov Institute of General and Inorganic Chemistry

Email: ep_simonenko@mail.ru
Russian Federation, Moscow, 119991

A. N. Gordeev

Ishlinskii Institute of Problems of Mechanics

Email: ep_simonenko@mail.ru
Russian Federation, Moscow, 119526

A. F. Kolesnikov

Ishlinskii Institute of Problems of Mechanics

Email: ep_simonenko@mail.ru
Russian Federation, Moscow, 119526

E. K. Papynov

Institute of Chemistry, Far-Eastern Branch; Far-Eastern Federal University

Email: ep_simonenko@mail.ru
Russian Federation, Vladivostok, 690022; Vladivostok, 690091

O. O. Shichalin

Institute of Chemistry, Far-Eastern Branch; Far-Eastern Federal University

Email: ep_simonenko@mail.ru
Russian Federation, Vladivostok, 690022; Vladivostok, 690091

K. Yu. Tal’skikh

Institute of Chemistry, Far-Eastern Branch; Far-Eastern Federal University

Email: ep_simonenko@mail.ru
Russian Federation, Vladivostok, 690022; Vladivostok, 690091

E. A. Gridasova

Institute of Chemistry, Far-Eastern Branch; Far-Eastern Federal University

Email: ep_simonenko@mail.ru
Russian Federation, Vladivostok, 690022; Vladivostok, 690091

V. A. Avramenko

Institute of Chemistry, Far-Eastern Branch; Far-Eastern Federal University

Email: ep_simonenko@mail.ru
Russian Federation, Vladivostok, 690022; Vladivostok, 690091

V. G. Sevastyanov

Kurnakov Institute of General and Inorganic Chemistry

Email: ep_simonenko@mail.ru
Russian Federation, Moscow, 119991

N. T. Kuznetsov

Kurnakov Institute of General and Inorganic Chemistry

Email: ep_simonenko@mail.ru
Russian Federation, Moscow, 119991

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