Some Aspects of Powder Metallurgy

Electrodeposition of Copper Powder from Acid Sulfate Baths

“…In these experiments, convection was held constant with a stirrer, but undoubtedly the characteristics of the deposited copper are also influenced by the rate of flow of solution past the cathode. Optimum efficiencies were found at 40°C ., 75 amperes per square foot, 12 to 31 grams of copper per liter, and 90 to 200 grams of sulfuric acid per liter. In the experiments on Cell Voltagb.…”

Circular of the Bureau of Standards no. 485:

“…Sintered nickel powder (see page 4) is used for filtering and purifying concentrated alkaline solutions, and porous cups made from nickel powder are used in proximity fuses where the delayed action mechanism is controlled by the time required for mercury to seep through [303,338].…”

“…It is ductile and malleable and is produced as castings, strip, rod, and wke. Typical magnetic values are maximmn magnetizing force (H max) 3,200 oersteds, maximum miagnetic flux density (B max) 8,000 gausses, residual magnetism (Br) 3,400 gausses, corrosive force (He) 710 oersteds, and maximum external energy (BdHd) maximum 850,000 [340, 389a] Copper-Nickel-Tungsten Contact points containing these three metals have been prepared by powder metallurgy technique [303].…”

“…Alloys of nickel and molybdenum are used in radio tubes, and similar alloys, prepared by powder metallurgy processes, have been used as ther-moco\iples with nickel [303]. 17.…”

“…Nickel-tungsten thermocouple elements, prepared by powder metallurgy processes, have been used in conjunction with nickel elements at temperatures up to 1,400°C in hydrogen atmospheres [303].…”