Ni 80-Cr20 mixed powders were heated and sintered in mica lined copper dies by passing a low voltage high amperage current for a short time. The amperage built-up, compact density increase and structure change during the sintering process were studied. The results of experiments are as follows.
(1)Mica lining can be used for the resistance sintering under pressure.
(2)The built up time depends on the voltage, pressure and height of powder in dies.
(3)The apparent density of sintered compacts increases with the product of ampere and cycle.
(4)The area of sample has a large influence on the apparent density of sintered compacts.
(5)When the pressure applied during resistance sintering is not sufficiently high, the apparent density of compacts decreases in the later period of sintering.
(6)The progresses of sintering and diffusion depend on such factors as the sample weight, preliminary compacting pressure, pressure during sintering, sintering time and preliminary sintering.