EFFECT OF POWDER PARTICLE SIZE ON THE GRAIN SIZE OF THE SINTERED MATERIAL
Technical Report
·
OSTI ID:4334988
Metal powder compacts, when exposed to sintering conditions, show grain growth which is determined by the temperature and time of sintering. The rate of grain growth is delayed by the pores between powder particles, which act similarly to the way impurities do in solid metals. During sintering the compact densifies and the pores undergo three different types of chsnge: they decrease in size; they collect and form larger ones, and therefore decrease in number; and, finally, they change in shape and spheroidize. Experimental work indicates that the grain growth is delayed by porosity only up to a certain configuration of the voids. The rate of grain growth increases rapidly when spheroidization of the voids takes place. Smaller pores, such as obtained by compacting fine metal powders, spheroidize faster than the larger pores in coarse particle compacts, and the more rapid grain browth, therefore, starts earlier in compacts made from small powder particles. (auth)
- Research Organization:
- Penn-Texas Corp., New York
- NSA Number:
- NSA-12-000286
- OSTI ID:
- 4334988
- Report Number(s):
- NYO-8529
- Country of Publication:
- United States
- Language:
- English
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