Y-Al-Si-O-N-F oxygen and nitrogen crystallized glass adopting Y2Si2O7 as principal crystalline phase and preparation method

Abstract

The invention discloses Y-Al-Si-O-N-F oxygen and nitrogen crystallized glass adopting Y2Si2O7 as the principal crystalline phase and a preparation method. Base glass comprises the following elements: Y, Si, Al, O, N and F. The preparation method comprises the steps that raw materials are mixed and subjected to ball milling; after being filtered at 200 meshes, the raw materials are melted at 1550 to 1580 DEG C under nitrogen protection; and then annealing is performed at 850 to 900 DEG C, so as to obtain oxygen and nitrogen base glass. The oxygen and nitrogen base glass is heated to 40 to 60 DEG C higher than glass transition temperature to be subjected to coring under nitrogen protection according to the thermal differential analysis and test result of the oxygen and nitrogen base glass, and then the oxygen and nitrogen base glass is continuously heated to 10 DEG C plus or minus recrystallization temperature to be subjected to crystallization, so that the Y-Al-Si-O-N-F oxygen and nitrogen crystallized glass adopting Y2Si2O7 as the principal crystalline phase is obtained. The method is simple, the melting temperature, the transition temperature and the recrystallization temperature are low, the method is environmentally friendly, the production cost is low, the Y-Al-Si-O-N-F oxygen and nitrogen crystallized glass can be applied to high-temperature resistant components, such as aircraft engines or turbine blades, and the application prospect is wide.

Description

technical field [0001] The invention belongs to the field of material science and relates to a kind of main crystal phase which is Y 2 Si 2 o 7 Y-Al-Si-O-N-F oxynitride glass-ceramic and its preparation method. Background technique [0002] Al-Si-O-N based ceramic composites are important structural and functional materials, the main reason for their limited application is the susceptibility to brittle fracture. The introduction of continuous fibers into Al-Si-O-N-based ceramics can greatly increase its strength and toughness, change the shape of the force-displacement curve, and fracture behavior similar to metal materials. Therefore, fiber-reinforced and toughened N-O-Al-Si-based ceramic composites are one of the important development directions in the field of materials. However, currently used fibers are mainly carbon fibers (C f ) and silicon carbide fibers (SiC f ), its oxidation characteristics at high temperatures and the microcracks induced inside the material...

AI Technical Summary

Problems solved by technology

The decomposition of silicon nitride will lead to the precipitation of Si particles in the glass, making the glass appear gray or gray-black, making the glass opaque, and also adversely affecting the performance of the glass

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