Abstract
In cold pressing in a vacuum, raising the pressing pressure decreases the size of submicropores owing to the absence of the counterpressure of gas trapped in them. During heating, the healing of submicropores in porous specimens produced by SCP in a vacuum takes place much more rapidly than the healing of gas-filled submicropores. The time taken for submicropores to heal completely is 5–10 min in the former case and 1–1.5 h in the latter. Use of a vacuum as a protective environment is particularly advantageous in the manufacture of parts from a charge based on a high-quality iron powder (having a low nonmetallic inclusion concentration) and of parts of complex configuration as well as in cases where the materials employed react strongly with the usual protective atmospheres.
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