Preparation method of hard mutual dissolve alloy and its special device

Abstract

A process for preparing the alloy of the components difficult to dissolve mutually by pneumatic spray technique includes mixing the superfine particles of its components, mixing the granular mixture with the compressed air in the supersonic nozzle to obtain dual-phase airflow, and spraying it onto surface of workpiece for depositing the particles on the plastically deformed surface of workpiece to form an alloy layer. Its apparatus is composed of high-pressure air source, heater, power feeder, and supersonic nozzle.

Description

technical field [0001] The invention relates to the preparation technology of the incompatible alloy, in particular to a preparation method of the incompatible alloy and a special device thereof. Background technique [0002] Refractory alloys are alloys that have significant differences in melting point and density, limited miscibility between components in the liquid state and immiscibility in the solid state, so the metals of this system will be stratified and separated in specific gravity in the liquid state during the smelting process , using conventional smelting methods, it is difficult to obtain the ideal structure. In recent decades, researchers have tried various non-equilibrium methods, such as: rapid solidification, mechanical alloying and powder metallurgy, but these methods have great difficulties. The rapid solidification method needs to obtain high-speed quenching powder or thin strip (thickness of tens of microns), which will quickly lose its physical-mecha...

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Problems solved by technology

[0002] Refractory alloys are alloys that have significant differences in melting point and density, limited miscibility between components in the liquid state and immiscibility in the solid state, so the metals of this system will be stratified and separated in specific gravity in the liquid state during the smelting process , using conventional smelting methods, it is difficult to obtain ideal organizational structure

In recent decades, researchers have tried various non-equilibrium methods, such as: rapid solidification, mechanical alloying and powder metallurgy, but these methods have great difficulties

If the rapid solidification method is to obtain high-speed quenched powder or thin strip (thickness of tens of microns), it will quickly lose its physical-mechanical performance level, and the method of spray deposition is difficult to ensure sufficient cooling rate and good combination with the matrix

The method of mechanical alloying can obtain well-dispersed alloy powder, but the low-temperature recrystallization of the ultra-dispersed system hinders this approach to maintain the original dispersed system and obtain the corresponding physical-mechanical properties. In addition, when the powder metallurgy method forms bulk materials , there are also problems of recrystallization, grain growth and macrosegregation during sintering

It can be said that the existing technical methods have not been able to solve the problem of preparation of immiscible alloys well.

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