High-strength carbon fiber enhanced aluminum oxide ceramic matrix composite and preparation method thereof

Abstract

The invention discloses high-strength carbon fiber enhanced aluminum oxide ceramic matrix composite and a preparation method thereof. The high-strength carbon fiber enhanced aluminum oxide ceramic matrix composite is characterized by being prepared from raw materials in parts by weight as follows:60-70 parts of aluminum oxide, 10-13 parts of modified high-elastic carbon fiber, 3-5 parts of boron nitride, 3-4 parts of lithium oxide, 5-8 parts of acrylic acid-2-hydroxy ethyl ester, 0.03-0.06 parts of cyclohexanone peroxide, 3-4 parts of a chitosan-acetic acid solution, 0.3-0.5 parts of a crosslinking agent TAIC, 10-15 parts of anorthite, 2-3 parts of sodium hexametaphoshpate, 20-30 parts of ethanol and 40-60 parts of deionized water. With modified high-strength carbon fiber as an enhancing phase, the high-strength carbon fiber enhanced aluminum oxide ceramic matrix composite has the advantages of excellent oxidation resistance, improvement of ceramic toughness and strength, high-temperature and low-temperature resistance, good thermal conductivity and small expansion coefficient; added anorthite can reduce drying shrinkage and deformation of a blank body, the drying performance is improved, the drying time is shortened, accordingly, the blank body is compact, void is reduced, and the mechanical strength and the dielectric property are improved.

Description

technical field [0001] The invention relates to a high-strength carbon fiber reinforced aluminum oxide ceramic-based composite material and a preparation method thereof, belonging to the technical field of ceramic production. Background technique [0002] Alumina ceramic materials have been valued due to a series of advantages such as low density, high temperature resistance, high strength at room temperature and high temperature, and are considered to be the main candidate materials for hot end parts, but single-phase ceramic materials are sensitive to cracks and brittle fracture mode, which reduces the reliability of its use. The Achilles heel of ceramic materials is brittleness. Under the action of external force, stress concentration occurs on the surface of the material or at the tip of micro-cracks in the interior, and the crack expands to form surface energy to consume energy. Therefore, the crack propagation speed is extremely fast, often causing the ceramic materia...

AI Technical Summary

Problems solved by technology

[0002] Alumina ceramic materials have been valued due to a series of advantages such as low density, high temperature resistance, high strength at room temperature and high temperature, and are considered to be the main candidate materials for hot end parts, but single-phase ceramic materials are sensitive to cracks and brittle fracture mode, which reduces the reliability of its use

The Achilles heel of ceramic materials is brittleness. Under the action of external force, stress concentration occurs on the surface of the material or at the tip of micro-cracks in the interior, and the crack expands to form surface energy to consume energy. Therefore, the crack propagation speed is extremely fast, often causing the ceramic material to suffer in an instant. to catastrophic damage