Abstract: A method for manufacturing an electrical contact pad, including a pad mounting and at least one contact layer, and a method for manufacturing an electrical contact, including a contact mounting and at least one contact layer are described. The methods include a step of depositing, via cold gas dynamic spraying, a first powder onto the pad or contact mounting so as to form the contact layer, the first powder containing at least particles including grains made of at least one refractive material, the grains being built into a matrix made of conductive metal selected from among silver or copper. The pads and the electrical contacts obtained in the respective manufacturing methods are also described.

Abstract: Method of using a material including a conductive metal matrix and magnetic entities representing between 8 and 80% by weight of the material and including hard magnetic phases, the magnetic entities being non-magnetized but capable of being magnetized in an average orientation defined by the direction of a magnetic field applied to the material, in order to blow an electric arc between two electrical contact pads, at least one of which includes the material.

Abstract: The invention relates to a method for preparing silver nanoparticles having a diameter lower than 80 nm, and dispersed in a polymer matrix in a concentration higher than 1 M, that comprises the following steps: i) mixing an organic silver salt and a polymer having an alcohol terminal function in a solvent containing at least one alcohol fraction; ii) agitating and heating the mixture obtained during the previous step; and iii) separating the polymer phase charged with silver nanoparticles.

Abstract: A nickel-free white gold alloy comprises, expressed by weight, in addition to between 75% and 76% Au and between 5% and 14% Pd, between 7% and 17% of Cu, the proportion of Cu being approximately inversely proportional to that of Pd, and the balance being formed by at least one of the elements Ir, In, Ag, Zn, Ga, Re, Zr, Nb, Si, Ta and Ti.

Abstract: A method for producing a contact material made of copper and chromium in a proportion of 40 to 75 wt.-% copper and 25 to 60 wt.-% of chromium for contact pieces for vacuum switch devices by pressing the powder mixture, sintering and infiltrating the compact and subsequent reshaping into a semi-finished contact material product having a density which corresponds to at least 99% of the theoretical density, as well as to contact pieces made of this semi-finished contact material product.

Abstract: A nickel-free white gold alloy comprises, expressed by weight, in addition to between 75% and 76% Au and between 5% and 14% Pd, between 7% and 17% of Cu, the proportion of Cu being approximately inversely proportional to that of Pd, and the balance being formed by at least one of the elements Ir, In, Ag, Zn, Ga, Re, Zr, Nb, Si, Ta and Ti.