Insert part that can be infiltrated

A method for producing an aluminium piston having an insert part, comprising:

• providing a sintered powder material containing at least iron or alloys thereof, wherein the sintered powder material includes particles having different grain sizes and up to 4% by volume of the powder includes particles having a diameter smaller than 75 μm, and wherein the sintered powder material further includes a fraction of less than or equal to 10% by volume of particles with a diameter of 75-106 μm, a fraction ranging from 0.5 to 6.0% by volume of particles with a diameter of 106-150 μm, and a fraction of at least 50% by volume of particles having a diameter greater than 150 μm;
• and
• introducing a liquid material of an aluminium alloy into a casting mould under a casting pressure of about −0.5 to 15 bar to form at least part of a cast piston, wherein the liquid material of the aluminium alloy infiltrates the sintered powder material arranged in the casting mould.

An insert part for a cast piston of an internal combustion engine, comprising:

• a material having a capacity for being infiltrated and composed of a powder containing at least iron or alloys thereof, the powder containing a size distribution of particles having different grain sizes, wherein the size distribution of particles in the powder includes a fraction of 4% or less by volume of particles having a diameter smaller than 75 μm, a fraction of 10% or less by volume of particles having a diameter of 75-106 μm, a fraction of 0.5 to 6.0% by volume of particles with a diameter of 106-150 μm, and a fraction of at least 28% by volume of particles having a diameter greater than 150 μm.