Multicomponent flux composition method capable of lowering metal-matrix composite synthesis temperature

Abstract

The invention provides an integration method-multiple flux combining method for reducing the composing temperature of an in situ reaction. The polyatomic flux is added into reaction salt for obtaining mixed salt; then the mixed salt is added into a metal fused mass through low temperature roasting and high temperature pre-heating for carrying out composing reaction; and stirring is carried out on the fused mass during a composing process. The compound preparation process of the integral method is accomplished through 'adding a fluxing agent in the reaction salt plus roasting the mixed reaction salt in low temperature plus preheating in high temperature plus stirring and composing', thus achieving the object of reducing the composing temperature of the in situ reaction. The integration method can be adopted for reducing the initial temperature of the fused mass of the in situ reaction by 40 to 80 DEG C. Under a low overheat condition, the integration method is beneficial to inhibiting the growing of an enhancing phase in the high temperature fused mass and is very beneficial to preparing a submicron phase enhanced aluminum-based compound material in industrial scale; simultaneously, the air suction and burning loss amount of the fused mass of aluminum alloy are reduced; the pollution of high temperature to the fused mass is reduced; and seen from the aspect of energy saving, the technology also has the advantages of low cost and high effect.

Description

technical field [0001] The invention relates to the field of preparation of reaction-synthesized metal-matrix composite materials, in particular to a new method for reducing the reaction-synthesis temperature of metal-matrix composite materials—multiple flux combination method. Background technique [0002] At present, in situ synthesis techniques mainly include XD TM method, DIMOX TM Law, PRIMEX TM method, VLS method, LSM method, SHS method, CR method, MA method, melt reaction method (Direct Melt Reaction, DMR), etc. Among them, the melt reaction method is to add solid particles or powders containing reinforced particle-forming elements to molten aluminum or its alloys at a certain temperature to fully react, thereby preparing endogenous particle-reinforced aluminum-based composite materials, and Castings with complex shapes can be poured directly. Therefore, it has the advantages of simple process, low cost, short cycle, and easy industrial production, and is considere...

AI Technical Summary

Problems solved by technology

However, a prominent problem in the melt reaction method is that the temperature required for in-situ reaction synthesis is relatively high, close to or higher than 900°C, or even more than 1000°C. Such a high reaction synthesis temperature not only increases the gas absorption of aluminum liquid , so that the quality of the molten aluminum is reduced, and it is difficult to control the shape and size of the reinforced phase formed in situ, which leads to the unstable performance of the metal matrix composite material synthesized by the reaction, and it is difficult to industrialize the production

Therefore, high reaction synthesis temperature has become a "bottleneck" problem restricting the industrial-scale preparation of metal matrix in situ composites.

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