Alumina fiber reinforced alumina ceramic matrix composite and preparation method thereof

Abstract

The present invention discloses an alumina fiber reinforced alumina ceramic matrix composite and a preparation method thereof, the alumina fiber reinforced alumina ceramic matrix composite is characterized by comprising the following raw materials by weight: 40-60 parts of alumina, 20-30 parts of clay, 10-15 parts of modified alumina fiber, 2-3 parts of antimony sulfide, 1-3 parts of beryllium oxide, 0.03-0.05 part of methyl ethyl ketone peroxide, 3-5 parts of vinyl acetate, 0.2-0.4 part of silane coupling agent KH550, 1-2 parts of microcrystalline wax, 1-2 parts of carboxymethyl cellulose, 20-30 parts of ethanol, and 30-40 parts of deionized water; the antioxidant treated alumina fiber added in the alumina fiber reinforced alumina ceramic matrix composite is used as a ceramic reinforcing phase, and has the characteristics of ceramic toughness reinforcing properties, mechanical properties, abrasion resistance, hardness and high temperature resistance, the gel casting technology used in the method can reduce the production cost, and improve the material integrity and machinability, and any shape and size of ceramic structural workpieces can be convenient to produce.

Description

technical field [0001] The invention relates to an alumina fiber-reinforced alumina ceramic matrix composite material and a preparation method thereof, belonging to the technical field of ceramic production. Background technique [0002] 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. According to the theory of composite materials, when the crack expands and encounters the fiber, the energy is absorbed through the detachment of the interface between the fiber and the matrix, and the stress concentration is eased; Greater energy. Therefore, fiber-reinforced ceramic matrix composites are an effective way to solve the brittlen...

AI Technical Summary

Problems solved by technology

[0003] 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 Alumina fiber has outstanding high temperature resistance, good heat insulation, small heat capacity, good chemical corrosion resistance, good wettability with the matrix, and small interface reaction, so alumina fiber reinforced The ceramic matrix composite material has good high temperature resistance and high fracture toughness, the mechanical properties, wear resistance and hardness of the composite material are improved, the thermal expansion coefficient is reduced, and the alumina fiber has been treated with anti-oxidation, so it can be used in high temperature oxidation environment Working for a long time, it will not form resistance fracture due to oxidation, and the cost is relatively low. It is one of the most potential high temperature and fracture materials.