Aluminum Phosphorus alloy modifier

Aluminum Phosphorus alloy modifier

Eutectic and Hyper-eutectic Al-Si series alloys are widely used phosphorus metamorphic treatment to meet the volume stability and high temperature performance requirements. The addition of red phosphorus, phosphorus salt, P-Cu, etc., but the densification effect are unstable, there are also the following shortcomings: red phosphorus low ignition point, unsafe delivery, the application of violent reactions, the emission of P₂O₅ toxic gas; phosphorus salt added to a large amount, corrosion of the furnace lining, pollution of the environment; P-Cu high melting point, difficult to dissolve, easy to segregate.

Based on current producing situation, we commercialize Al-P alloy and successfully promoted its application widely over engine piston producers.

 I. Application effect:

Compared with the traditional process (shown in Figure 3-1a,b), it avoids the emission of P₂O₅ toxic gas, combines alloying and densification treatment into one, simplifies the process, reduces energy consumption, and makes the melting and casting process environmentally friendly (Figure 3-1c,d).

Figure 3-1 Comparison of traditional densification process and Al-P alloy new technology application

Al-P alloy significantly improves the metallographic grade of Al-Si alloys and improve mechanical properties such as degree, wear resistance and bulk stability. The densification effect on the sub-eutectic Al-Si alloy is shown in Figure 3-2, which can make the primary crystalline silicon precipitate uniformly on the aluminum matrix. The refining effect on hyper-eutectic Al-Si alloys is shown in Figure 3-3, which significantly refines the size of the primary silicon from over 200um to less than 40um. The refining effect on hyper-eutectic Al-Si alloys for engine piston is shown in Figure 3-4.

3-2 figure

3-3 figure: Al-18Si alloy (left figure) comparison with Al-4.5P crystallic alloy (right figure)

3-4 figure: Conventional refining agent(left figure) add in truck engine piston casting, its outer appearance comparison with Al-4.5P alloy addition( right figure)

lI. Product advantages

Plenty of enterprises at home and abroad for over a decade of application shows that the Al-P alloy has the following characteristics:

1. Easy to add, easy to operate, clean and clean working environment during use, eco-friendly.

2. High phosphorus absorption rate, the amount of addition can be controlled; stable and long-lasting metamorphic effect and improve the metallurgical grade.

3. Synchronization of the densification process and alloying process can be realized, significantly improving production efficiency.

 lII.  Product chemical composition

Available form: in ingot form.

Package: 0.5kg/ingot, total 40 ingots into a industrial plastic bag and then into carton.

lV.  Product grades

Al-4.5P

V. Application areas: Near-eutectic Al-Si alloy densification treatment.

                                   Refinement of hyper-eutectic Al-Si alloys.

                                   Removal of Ca and Na impurity elements from aluminum.

                                   Al-Mg-Si alloy refinement of primary crystalline Mg₂Si.