Aluminium-phosphorus intermediate alloy and its preparation method

Abstract

An Al-P intermediate alloy used for fining the crystallized silicon in Al-Si alloy is prepared from the industrial pure aluminium, Cu-P alloy, crystallized silicon, red phosphorus and aluminium phosphite through proportioning, smelting pure aluminium, sequentially adding others, stirring, until full reaction, and casting into ingot or extruding into wire material. Its advantages are no pollution,high smelting speed, and long and stable modifying effect.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to an aluminum-phosphorus master alloy for refining primary silicon in aluminum-silicon alloys and a preparation method thereof. technical background [0002] The primary silicon in aluminum-silicon alloys has to be refined to make such alloys useful. In industrial production, the method of adding phosphorus is generally used to refine primary silicon (also known as modification treatment), mainly in the form of red phosphorus, phosphorus salt or copper-phosphorus master alloy. However, there are many disadvantages in these methods: red phosphorus has a low ignition point (240°C), is unsafe to transport, and reacts violently when it deteriorates, producing a large amount of toxic P 2 o 5 Gas, which seriously pollutes the environment; the effect of phosphorus salts is unstable, and there are also environmental pollution problems during use; copper-phosphorus master alloys are difficu...

AI Technical Summary

Problems solved by technology

However, there are many disadvantages in these methods: red phosphorus has a low ignition point (240°C), is unsafe to transport, and reacts violently when it deteriorates, producing a large amount of toxic P 2 o 5 Gas, which seriously pollutes the environment; the effect of phosphorus salt is unstable, and there are also environmental pollution problems during use; copper-phosphorus master alloy is difficult to melt after being added to aluminum alloy, easy to segregate, and the effect is unstable

The aluminum-copper-phosphorus master alloy prepared by this process has a good modification effect, but due to the extremely complicated preparation process and high cost, the master alloy has not been widely used so far.