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Zirconium Boride is of Great Significance to the Development of Aerospace Technology

wallpapers Industry 2020-07-21

Ultra-high temperature ceramic matrix composite materials refer to high-temperature structural elements with the ceramic phase as the matrix that can maintain stable physical and chemical properties in a high-temperature environment above 2000 ℃. They have low density, wear resistance, excellent high-temperature physical properties, and thermochemical stability. With outstanding advantages such as excellent performance and good thermal shock resistance, ultra-high temperature ceramic matrix composites are considered to be the most promising materials for manufacturing spacecraft thermal protection components.

Carbide ceramic matrix composite

Ultra-high temperature carbide ceramics mainly include zirconium carbide (ZrC), hafnium carbide (HfC), tantalum carbide (TaC), titanium carbide (TiC), etc., with high melting point, high-temperature strength, excellent electrical and thermal conductivity, and good thermal shock resistance, However, due to its brittleness and insufficient oxidation resistance, silicon carbide (SiC), zirconium boride (ZrB2), zirconium oxide (ZrO2), molybdenum silicide (MoSi2), molybdenum (Mo) metals, graphite is often added (Cg), and other particles enhance its mechanical properties, improve its oxidation resistance and sintering properties. Common carbide ceramic matrix composite materials are ZrC-SiC, ZrC-ZrB2, ZrC-ZrO2, ZrC-MoSi2, ZrC-Mo, ZrC-SiC-Cg, HfC-SiC, TaC-SiC, TiC-SiC, etc.

Boride ceramic matrix composite

Ultra-high temperature boride ceramics mainly include zirconium boride (ZrB2), hafnium boride (HfB2), tantalum boride (TaB2) and titanium boride (TiB2). Ultra-high temperature boride ceramics have strong covalent bonds, which have a high melting point, high strength, high thermal and electrical conductivity, and low evaporation rate. However, the strong covalent bond characteristics make it challenging to densify and sinter the material. The high-temperature oxidation resistance of materials also needs to be improved. ZrB2 and HfB2 are the most widely studied ultra-high temperature boride ceramics. By adding SiC to prepare ZrB2-SiC and HfB2-SiC composite materials, a higher binary eutectic temperature can be obtained, and the mechanical and oxidation resistance of the material can be improved.

Continuous fiber toughened ceramic matrix composite.

Continuous fiber toughened ceramic matrix composites refer to ultra-high temperature ceramics or multiphase ceramics as the matrix, such as ZrC, ZrB2, HfC, HfB2, TaC, ZrC-SiC, ZrB2-SiC, HfB2-SiC, ZrB2-ZrC-SiC, etc. , With high-temperature resistant fibers as reinforcements, such as carbon fiber (Cf), silicon carbide fiber (SiCf), etc., ultra-high temperature composite materials with high strength, high toughness, low density, and high-temperature resistance are formed.


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Tag: Zirconium Boride