Production and properties of the aging powdered alloy Cu-0.8% Cr. II. Production of electric contacts of aging alloy Cu-0.8% Cr for welding machines by extrusion

Translated from Poroshkovaya Metallurgiya, No. 11(359), pp. 71–73, November, 1992.     

A plant for the preparation of protective atmospheres

Conclusions A laboratory plant for the preparation of H₂ + CO protective atmospheres from propane-butane gas or dissociated ammonia at a rate of up to 0.4 m³/h has been constructed and tested.Translated from Poroshkovaya Metallurgiya, No. 4 (148), pp. 94–96, April, 1975.     

Sinterability of titanium powder

Conclusions The sintering process of compacts from dispersed titanium powders (as well as from metal powders with easily reducible oxides) is accomplished in two stages — a nonsteady stage with a high densification rate and a steady stage, whose rate is determined by volume diffusion. The low values of energy of activation for densification in the first stage of sintering may be linked with the dissolution of oxides in the outer layers of powder particles, which increases their surface defectiveness, or with the propagation of flow by the mechanism of activated slip of dislocations.Translated from Poroshkovaya Metallurgiya, No. 2 (86), pp. 27–31, February, 1970.     

Properties of sintered dispersion-hardening Cu-Ti-B alloys

Conclusions Small additions of boron to dispersion-hardening Cu-Ti alloys significantly change their properties. The hardness drops and the plasticity and electrical conductivity increase. In addition, the alloys containing boron almost completely lose their capacity for a change in properties in aging.Translated from Poroshkovaya Metallurgiya, No. 6(306), pp. 49–52, June, 1988.     

Thermal and electrical properties of porous titanium

Conclusions The thermal conductivity, coefficients of thermal expansion and thermo-emf, and electrical resistivity of porous titanium have been determined in the temperature range from ambient to 800–1200°C. The effect of specimen porosity on the character of the thermal and electrical conductivities of porous titanium has been established. A study has been made of the effect of the- phase transformation on the electrical conductivity and thermo-emf of porous titanium. The thermal conductivity may be evaluated from the electrical conductivity with the aid of an experimentally established value of Lorentz number.Translated from Poroshkovaya Metallurgiya, No. 8 (92), pp. 35–38, August, 1970.