Effect of the Surface Relief of HfB2-SiC Ceramic Materials on Their High-Temperature Oxidation


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Samples of an ultra-high-temperature HfB2–30 vol % SiC ceramic material with an SiC crystallite size of ~50 nm have been fabricated by hot pressing of an HfB2–(SiO2–C) composite powder synthesized through a sol–gel route. It has been found that the selected hot-pressing conditions (1800°C, 15 min, 30 MPa) ensure complete conversion of silica to silicon carbide and afford a material with a relative density of 96.9%. The effect of a relief applied to the sample surface in the form of ring grooves with a depth of <0.5 mm on the oxidation of the material exposed to a subsonic dissociated air flow—temperature distribution over the surface, elemental and phase composition, and microstructure—has been studied using a high-frequency induction plasmatron.

作者简介

E. Simonenko

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

编辑信件的主要联系方式.
Email: ep_simonenko@mail.ru
俄罗斯联邦, Moscow, 119991

N. Simonenko

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

Email: ep_simonenko@mail.ru
俄罗斯联邦, Moscow, 119991

A. Gordeev

Ishlinskii Institute of Problems of Mechanics, Russian Academy of Sciences

Email: ep_simonenko@mail.ru
俄罗斯联邦, Moscow, 119526

A. Kolesnikov

Ishlinskii Institute of Problems of Mechanics, Russian Academy of Sciences

Email: ep_simonenko@mail.ru
俄罗斯联邦, Moscow, 119526

A. Lysenkov

Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences

Email: ep_simonenko@mail.ru
俄罗斯联邦, Moscow, 119334

V. Sevastyanov

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

Email: ep_simonenko@mail.ru
俄罗斯联邦, Moscow, 119991

N. Kuznetsov

Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

Email: ep_simonenko@mail.ru
俄罗斯联邦, Moscow, 119991

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