Molybdenum-niobium-silicon alloy and preparation method thereof

Abstract

The invention discloses a molybdenum-niobium-silicon alloy and a preparation method thereof, and belongs to the technical field of intermetallic compounds. A chemical expression of the molybdenum-niobium-silicon alloy is (Mo1-xNbx)Si2, wherein X is within 0-1. The preparation method comprises the steps that molybdenum power, niobium power and silicon power are mixed uniformly according to 0-33.3mol%Mo, 0-33.3mol%Nb and 66.7mol% Si, wherein the sum of molar proportions of Mo and Nb is 33.3%; mixed powder is pressed to a billet and put into a reaction kettle; the mixed powder billet is ignited in a protective atmosphere and synthesized to the molybdenum-niobium-silicon alloy; and synthesized molybdenum-niobium-silicon alloy powder is subjected to densification sintering by a vacuum hot pressed sintering method. Compared with the prior art, with the adoption of the molybdenum-niobium-silicon alloy and the preparation method, a non-equilibrium phase can be obtained, and properties of a material can be improved. Compared with technologies such as arc melting, the molybdenum-niobium-silicon alloy and the preparation method have the advantages of simple technology, simple and convenient equipment, time saving, energy saving, low cost and small pollution.

Description

technical field [0001] The invention belongs to the technical field of intermetallic compounds, and in particular relates to a molybdenum-niobium-silicon alloy and a preparation method thereof. Background technique [0002] The rapid development of my country's aerospace technology and national defense industry, especially national defense modernization and national economic construction such as the national medium and long-term planning large aircraft project and sonic vehicle project, urgently requires a large number of advanced high-temperature structural materials with independent intellectual property rights. Metal materials have high specific strength, high specific modulus, excellent high temperature resistance and durability, long-term work in high temperature oxidizing atmosphere, and good corrosion resistance. Judging from the current usage, the high-temperature resistant structural materials working below 1273K mainly include nickel-based, cobalt-based superalloys...

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Problems solved by technology

MoSi 2 In -Nb composites, the strengthening and toughening effect produced by the unit volume fraction of continuous fiber reinforced composites is obvious, but its manufacture is relatively difficult, especially how to evenly distribute long fibers in the matrix is ​​still a technological problem. Most continuous reinforced composite materials have anisotropy, which also limits their application, while the toughening effect of particle reinforced composite materials is limited

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