Mo-Si-B-W multi-phase composite material and preparation method thereof

Abstract

The invention discloses a Mo-Si-B-W multi-phase composite material, which is prepared with raw materials of the following atom percentages: 5-25 percent of silicon, 1-10 percent of tungsten, 5-30 percent of boron, and the resting being molybdenum. The mass purity of the silicon is no less than 98 percent, the mass purity of the tungsten is no less than 99 percent, the mass purity of the boron is no less than 99 percent, and the mass purity of the molybdenum is no less than 99 percent. The invention also discloses a preparation method of the Mo-Si-B-W multi-phase composite material. Mechanicalalloy and hot pressure sintering are adopted in the method to prepare the Mo-Si-B-W composite material, the method has the advantages of low energy consumption, short cycle and the like, and tungstenpowder is introduced into an Mo-Si-B composite material system so as to increase the high-temperature strength of the material and improve the reliability of the material in use. The composite material prepared in the method has a uniform and fine microstructure, the tensile strength of the composite material at 1400 DEG C is 400-460MPa, and the tensile elongation of the composite material is up to 400 percent.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a Mo-Si-B-W multiphase composite material and a preparation method thereof. Background technique [0002] The development of high-performance aircraft depends on the matching of advanced engines. Modern aerospace engines not only have high thrust, but also continuously improve the thrust-to-weight ratio. As engine thrust and efficiency increase, the turbine inlet temperature of the engine needs to be continuously increased. Among the turbine engine components, the working conditions of the turbine blades are the most severe. They must bear high stress in a high temperature and corrosive environment above 1000°C, and also require a long service life. This requires the turbine blade material to have high creep resistance. Good corrosion resistance, high high temperature durability, fracture toughness and fatigue properties, etc. The nickel-based and cobal...

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Problems solved by technology

Moreover, in order to isolate and refine the primary Moss dendrites and eliminate casting defects in the material, the heat-treated material must be subjected to hot extrusion treatment. This method has the disadvantages of high energy consumption and long cycle time.