Sintering of 17-4PH

Hey there!

Maybe one of you has an explanation for the following observation:

when sintering a MIM 17-4PH sample - particle size and green density remaining the same - in vacuum compared to hydrogen, I observed quite an increase in the starting temperature of sintering (about 80°C difference). Why does the vacuum retard the start of sintering?

2nd observation was that a much lower difference in sintering temperature (only about 5-10°C) occurred when repeating the experiment with 316L. Any ideas?

Thanks in advance Flipp

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Philipp Imgrund
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