Alumina fiber reinforced boron nitride ceramic matrix composite and preparation method thereof

Abstract

The present invention discloses an alumina fiber reinforced boron nitride ceramic matrix composite and a preparation method thereof, the alumina fiber reinforced boron nitride ceramic matrix composite is characterized by comprising the following raw materials by weight: 20-25 parts of aluminum nitride, 60-80 parts of boron nitride, 10-13 parts of modified alumina fiber, 2-4 parts of nitrile rubber powder, 0.02-0.03 part of cumene hydroperoxide, 5-6 parts of acrylonitrile, 0.3-0.5 part of hydroxypropyl acrylate, 5-8 parts of calcium carbonate, 1-3 parts of Arabic gum, 1-2 parts of sodium tripolyphosphate, 25-30 parts of ethanol, and 30-40 parts of deionized water; the antioxidant treated alumina fiber added in the alumina fiber reinforced boron nitride ceramic matrix composite is used as ceramic reinforcing phase, and has ceramic toughness reinforcing properties, mechanical properties, abrasion resistance, hardness and high temperature resistance, the added calcium carbonate in the molten state at a high temperature can improve the smoothness, expansion coefficient and viscosity of the ceramic surface, and the added nitrile rubber powder has a relatively strong high temperature viscosity, can bond solid particles together, and increase the viscosity of the ceramic.

Description

technical field [0001] The invention relates to an alumina fiber-reinforced boron nitride ceramic-based 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. Boron nitride is commonly known as white graphite. Its characteristics are similar to graph...

AI Technical Summary

Problems solved by technology

Boron nitride is commonly known as white graphite. Its characteristics are similar to graphite and its texture is white. The powder is white, light in weight, loose, lubricating, and easy to absorb moisture. However, it does not work with acids, alkalis, glass and most metals, and has high mechanical strength. , slightly higher than graphite, but there is no load softening phenomenon at high temperatures. Boron nitride is widely used. Its ceramics can be used as crucibles, boats, liquid metal delivery pipes, rocket nozzles, and semiconductor element doping sources for smelting and evaporating metals. And various high-temperature (high-voltage, high-frequency) insulation and heat dissipation components, but the stability is poor in an oxidizing atmosphere, the operating temperature is only below 900 ° C, and the hardness is low