Aluminium Pechiney

Pechiney Rhenalu

Constellium France

Robert Rey-Flandrin

Thomas Spadone

Christian Barthelemy

Airy-Pierre Lamaze

Olivier Ribaud

Stephane Vernede

Guillaume Bes

A casting process for an aluminum alloy containing at least about 0.1% of Mg and/or at least about 0.1% of Li in which a liquid surface of the alloy is put into contact with a dried gas including at least about 2% of oxygen by volume and with a water partial pressure lower than about 150 Pa throughout most of the solidification process is described. The process makes it possible to cast most oxidable aluminum alloys, in particular aluminum alloys containing magnesium and/or lithium, without using additives such as beryllium and/or calcium and without using expensive devices and/or gases, to obtain cast ingots generally free from surface defects and pollution, in complete safety.

Casting process for aluminum alloys

An ingot mold for metals which is intended for the production of an ingot through the cooling and solidification of a liquid metal mass. The mold includes a wall which defines a base and an inner surface having a part S, known as the cooling surface, which can discharge all or part of the heat energy released by the metal mass during the cooling and solidification thereof. The cooling surface S includes at least one flat surface element Si which forms all or part of the base () of the ingot mold. There is also at least one point C on a plane Pi which is tangential to each surface element Si, such that all of the segments of a straight line D connecting every point R of the cooling surface S to point C are only located inside the mold. Further, the total area of surface elements Si is at least equal to 10% of the surface S. The ingot mold can be used to accelerate the production of ingots.

Ingot mould for quenching metals and ingots thus obtained

The purpose of the invention is a coating precursor comprising a silicone resin, a mineral filler and an organic solvent capable of dissolving the said resin and putting the said mineral filler into suspension, the said silicone resin and the said mineral filler being capable of chemically reacting so as to produce a solid layer on a substrate after the organic solvent has evaporated and a cohesive refractory layer after a calcination operation. Another purpose of the invention is a method for coating a given surface of a substrate with at least one refractory layer containing silicon in which the substrate is coated with a coating precursor according to the invention so as to form a green layer and a heat treatment is carried out to calcine the said green layer and to form a cohesive refractory layer. The invention is a means of obtaining a protective coating capable of resisting oxidizing environments, liquid metal and solid or molten salt.

Coating precursor and method for coating a substrate with a refractory layer

The purpose of the invention is a coating precursor comprising a silicone resin and a mineral filler capable of chemically reacting so as to produce a solid layer on a substrate and a cohesive refractory layer after a calcination operation. The precursor may also include an additive capable of reducing its viscosity. Another purpose of the invention is a method for coating a given surface of a substrate with at least one refractory layer containing silicon in which the substrate is coated with a coating precursor according to the invention so as to form a green layer and a heat treatment is carried out to calcine the said green layer and to form a cohesive refractory layer. The invention is a means of obtaining a protective coating capable of resisting oxidising environments, liquid metal and a solid or molten salt.

Growing community of inventors

Saint Etienne de Crossey, France

Robert Rey-Flandrin