Foundry products
since 1879

AlCuP – Aluminium Phosphorus Rod

AlCuP – Aluminium Phosphorus Rod

Eutectic and hypereutectic AlSi foundry alloys are increasingly being used in the casting of parts for the automotive and machinery industries. Such parts must have a fine homogenous silicon structure. In order to achieve this, the maker of the alloy or the foundryman adds Phosphorus to his melt. Aluminium phosphides are thus formed, being the nuclei of a fine granular silicon crystal growth. Unlike all other products Phosphorus releasing, with which Aluminium phosphide nuclei (AlP) get formed in a long time and under influence of furnace temperature, AlCuP Phosphorus rod already contains such nuclei, necessary for primary silicon grain refining. Besides, in case of use of an alloy of only Copper Phosphorus (CuP), it’s evident that the transformation of CuP in AlP happens in a not co-ordinated way and, consequently, the Phosphorus yield varies frequently both on primary silicon dimension and distribution. Vice versa, since AlCuP has been used and approved by foundrymen for years, it’s well-known that only 40 ppm P (AlP) are necessary to achieve an excellent grain refining.


Compared with other products phosphorus releasing (as CuP), AlCuP has the following advantages:

  • Complete and immediate effect
  • Due to instantaneous effect, it’s possible to perform the treatment with phosphorus outside the melting furnace
  • High performance
  • Extraordinary proportionality and reproducibility of treatment and of its result
  • Possible application at “low” temperatures (i.e.: AlSi12 – 720°C, AlSi18 – 740°C)
  • Energy saving during melting and holding of alloy at low temperatures
  • Less increase and presence of hydrogen due to low temperatures
  • No production of smokes or dross
  • No risk for operators health
  • No chemical attack to equipments
  • Obtained dimensions of primary silicon of 30÷50 μm, depending on circumstances. The “more little” dimension of primary silicon improves wear resistance and life time of tools used for manufacturing pistons.
  • Time saving, due to instantaneous effect. Instead, 20÷45 minutes are necessary for CuP7 and other products, phosphorus releasing, in order to get the transformation of CuP in AlP.

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