Solvent for high-temperature melting heat-resistant aluminium alloy

Abstract

The invention was involved in an agent of fusion, especially for the agent of fusion for smelting heat-resisting aluminum alloy at high temperature. The agent of fusion consist of 60%-80% Na3AlF6, 5%-10% NaCl and 10%-20% CaF2. It had strong ability of adsorption, solution power and formation of slag. Compared with metal melt, the agent of fusion had rather large gravity difference. It was easy to separate the agent of fusion from metal for there was large boundary tension between metal melt and it. The agent of fusion had strong chemical stability and heat stability, so there was no corrosive action to metal and lining or no harmful gas and impurity. The agent of fusion with lower melting point and suitable viscosity, little hygroscopic ability and low vapor pressure was convenient to produce with cheap price. During the practice, the refine effect of slag removal and degasification were improved and metal oxidation, air-breathing and volatilization and the interaction of metal and lining were decreased so that the alloy technology was improved. The extensibility of alloy treated by antiflux was improved by 30% compared with the untreated alloy.

Description

Technical field: [0001] The invention relates to a flux, in particular to a flux used in high-temperature melting of heat-resistant aluminum alloys. Background technique: [0002] The smelting of ordinary aluminum alloys is generally below 1073K, while heat-resistant aluminum alloys contain elements with high melting points such as Fe and V, and the degree of alloying is high. Take Al-8.5Fe-1.3V-1.7Si (wt%) as an example The liquidus temperature of the alloy has reached 1123K. To ensure the smooth addition of alloying elements and the uniformity of the alloy composition, the melting temperature must be above 900°C and the holding time should be long; for the Al-8.5Fe-1.3V-1.7Si alloy, the melting temperature must reach 1873K in order to completely eliminate alloy melting. However, after increasing the melting temperature, the volatilization of alloying elements intensifies, the high-temperature oxidation of the melt accelerates, and the gas absorption of the melt doubles. ...

AI Technical Summary

Problems solved by technology

The flux covered in commonly used aluminum alloy melting is based on NaCl and KCl. As the melting temperature increases, especially when the temperature exceeds 1273K, its vapor pressure increases sharply, and it volatilizes itself severely and loses the function of isolating the air, resulting in continuous oxidation. , causing the melt composition and quality to be seriously affected

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