Inoculant with surface particles
AssigneePerropem
InventorsThomas Margaria, Aurelie Fay
Life of this patent
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Abstract
The present invention relates to a particulate inoculant for treating liquid cast-iron, comprising, on the one hand, support particles made of a fusible material in the liquid cast-iron, and on the other hand, surface particles made of a material that promotes the germination and the growth of graphite, disposed and distributed in a discontinuous manner at the surface of the support particles, the surface particles presenting a grain size distribution such that their diameter d50 is smaller than or equal to one-tenth of the diameter d50 of the support particles.
Claims17
A powdered particulate inoculant for treating liquid cast-iron, comprising:
- support particles made of a fusible material in the liquid cast-iron, and
- surface particles made of a material that promotes germination and growth of graphite, disposed and distributed in a discontinuous manner at a surface of the support particles,
- wherein
- the support particles comprise at least a ferro-silicon alloy, aluminum and calcium, wherein silicon is present in at least 40% by mass to the mass of said support particles, and aluminum and calcium are present in an alloyed form and each in amount of between 0.2 and 5% by mass relative to the mass of the support particles,
- the material of the surface particles is different from the material of the support particles, and
- the surface particles present a grain size distribution such that their diameter d50 is smaller than or equal to one-tenth of a diameter d50 of the support particles, and
- wherein, until an introduction of the cast-iron, the surface particles occupy up to 90% of the surface of the support particles.
A powdered particulate inoculant for treating liquid cast-iron, comprising:
- support particles made of a fusible material in the liquid cast-iron, comprising at least a ferro-silicon alloy, aluminum and calcium, wherein silicon is present in at least 40% by mass to the mass of said support particles, and aluminum and calcium are present in an alloyed form and each in amount of between 0.2 and 5% by mass relative to the mass of the support particles, and
- surface particles made of a material that is different from the material of the support particles, and that promotes the germination and the growth of graphite, disposed and distributed in a discontinuous manner at a surface of the support particles,
- wherein the support particles present a grain size distribution ranging from 0.2 to 7 mm,
- wherein the surface particles present a grain size distribution such that their diameter d50 is smaller than or equal to one-tenth of a diameter d50 of the support particles, and
- wherein, until an introduction of the cast-iron, the surface particles occupy up to 90% of the surface of the support particles.
Dependencies are inferred from the claim text.