Abstract
In order to study the densification behaviors, several tungsten powders were hot-pressed in vacuum at 1100-1300°C for 10 min under the pressure of 750-875kg/cm2. The density of the sintered specimens was 60-82% of the theoretical value, indicating that they are still in the initial stage of densification. Without additives, higher density is achieved with fine powders, but the density is not a simple function of the average particle size. In mixed powders, different densification behaviors were observed at lower temperatures and the densification is not affected significantly by the powder parameters. Summarizing, important factors in densification are powder, temperature and pressure in the order stated.
