The composite prepared by the technique of the powders metallurgy

摘要

P the present invention relates to a compressed element composed of particles of metal powders, is compressed, characterized in that it comprises 15 to 85% by volume of particles compressed to a first metallic powder having a thermal expansion coefficient of less than about 12 x 10 * * - 6 / °C. in the range of temperatures ranging from 25°C. to 400°C, while the remainder is composed of particles compressed to a second metallic powder having an electrical resistivity lower than 332 microhms - cm, these particles compressed of the two powders are mixed in a practically homogeneous throughout the mass of the element, the second metal powder having a coefficient of thermal expansion to 400°C, greater than that of the first metal powder, the said first metallic powder having an electrical resistivity greater than that of the second metal powder, and the degree of alloy between the particles of the first metal powder, and those of the second metal powder being sufficiently low so as to 400°C, the said article has a thermal expansion coefficient of less than that of the second metal powder and an electrical resistivity lower than that of the first metallic powder. / p