Copper-silicon-boron intermediate alloy and process for preparing same

Abstract

The invention discloses a Cu-Si-B middle alloy with 50.0-78.0 Cu, 20.0-48.0 Si and 0.5-5 B and making method of eutectic aluminum-silicon alloy in the deteriorate industry, which comprises the following steps: preparing pure copper, crystal silicon and Cu-B middle alloy material according to proportion; melting Cu-Si-B middle alloy in the fusion furnace at 1300-1500 deg.c; adding crystal silicon; stirring rapidly to react completely; casting directly to produce ingot. The invention possesses rapid melting speed with stable deteriorating effect without phosphor, which is new typed industrial crystal aluminum-silicon alloy alterant.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a copper-silicon-boron master alloy, a master alloy used in the modification treatment of industrial near-eutectic aluminum-silicon alloys, and a preparation method thereof. Background technique [0002] Near-eutectic aluminum-silicon alloy is the preferred material for manufacturing pistons due to its advantages of light weight, easy processing and low cost. Especially after phosphorus modification treatment, a large amount of fine primary silicon is precipitated on the aluminum substrate, forming a self-generated silicon particle reinforcement. Aluminum matrix composite material, with good wear resistance, volume stability and heat resistance, etc. Therefore, phosphorus modification treatment is widely used in the engine piston manufacturing industry. In industrial production, phosphorus is mainly added in the form of red phosphorus, phosphorus salt or master alloy. ...

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; the copper-phosphorus master alloy has a high melting point, and it is difficult to melt after being added to aluminum alloy, easy to segregate, and the effect is unstable

The Chinese patent No. ZL01107704.2 reports an aluminum-phosphorus-copper master alloy and its preparation method; Both of them have better solved the pollution problem in the process of adding modifiers, but the preparation process of these master alloys is complicated and the production cost is high