タングステン超微粉の圧粉性ならびに焼結性
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概要
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The effects of particle size on the void volume of green and sintered compacts have been studied with tungsten powders from 2.9 to 0.022μ in average diameter.<BR>The void volume of green compacts increased with decreasing particle size down to 0.3μ, but it remained essentially constant with further decrease in particle size.<BR>The sintering process of 0.022μ-powder consists of three stages. The first stage is characterized by an activation energy of 79 Kcal/mole and the surface diffusion mechanism would be operative. The activation energies of the second and the third stage are 102 and 124 Kcal/ mole respectively, the latter is comparable to that expected in volume diffusion. In the sintering of 0.022-powder, the first stage is important and 50-60% reduction in void volume was recorded. On the other hand, for coarser powders 60-80% reduction in void volume was observed after the second stage.
- 社団法人 粉体粉末冶金協会の論文