Method for preparing gamma' phase strengthened cobalt-based ODS alloy by using solution method

Abstract

The invention provides a method for preparing a gamma' phase strengthened cobalt-based ODS alloy by using a solution method, and pertains to the field of metal dispersion strengthening technology. According to the preparation method, a matrix metal salt, an oxide-forming salt, an oxidant, a fuel and a complexing agent are added into deionized water and mixing the mixture uniformly with stirring, and the mixed solution can be heated in a temperature-controlled furnace so as to be concentrated and subjected to a reaction to produce a foamed precursor in which oxides and a carbon source are mixed uniformly. The precursor power is reduced in a hydrogen atmosphere or an ammonia decomposition atmosphere to produce oxide-doped cobalt-based alloy power, and Al element power is added into the oxide-doped cobalt-based alloy power through a mechanical mixing method to produce cobalt-based ODS alloy power. Densifications of the cobalt-based ODS alloy power is realized by performing a spark plasma sintering process or a hot isostatic pressing process, and the gamma' phase strengthened cobalt-based ODS alloy is produced by performing a solid solution treatment and an ageing treatment. According to the invention, target element power can uniformly mixed with the organic carbon source in molecular level, and the particle size of the obtained oxides is small and uniform. The method has advantages of low raw material cost, rapid reaction speed, low energy consumption and simple processes, and is more applicable to industrial productions.

Description

technical field [0001] The invention belongs to the technical field of metal dispersion strengthening, and particularly provides a method for preparing a γ′ phase-strengthened cobalt-based oxide dispersion strengthening (Oxide Dispersion Strengthening, ODS for short) alloy by a solution method. Background technique [0002] The γ′ phase strengthened cobalt-based ODS alloy is a new type of high-temperature structural material, which combines two mechanisms of γ′ phase precipitation strengthening and oxide dispersion strengthening to improve the medium temperature (700~900°C) strength and high temperature ( ≥1000℃) strength. L1 formed by adding an appropriate amount of Al and W elements to the cobalt matrix 2 Structure γ′[Co 3 The (Al,W)] phase has high thermal stability, and the stability of the γ′ phase can be further improved by adding alloy elements such as Ni, Ta, and Ge. In the temperature range of 600~800℃, the γ′ phase makes the cobalt-based alloy appear anomalous s...

AI Technical Summary

Problems solved by technology

Since the powder inevitably partially adheres to the inner wall of the ball mill tank, it is difficult to achieve sufficient refinement and uniform dispersion of oxide particles. The high-energy ball mill process consumes time and energy, and is not suitable for low-cost, industrial production.

Chinese patent application number 201010512712.3 discloses a method for preparing cobalt-based ODS alloys by mechanochemical reaction, which uses YH with lower bond energy 2 and Co 2 o 3 As a raw material, the mechanochemical reaction between two components is used to generate Y in situ 2 o 3 The reinforcing phase improves the dispersion effect of oxides to a certain extent, but it also has the problem of easily introducing impurities and reducing fatigue performance, and is not suitable for mass production

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