i want to sinter niobium pellets. In literature it is mentioned to sinter for 2 hrs at 1200-1300 C ,but what should be the heating rate and time required to reach 1200 C. And is 2hrs for holding time?
Hi,
for sure 2 hours is a dwell time (permanence time at the desired temperature i.e. 1200 or 1300 °C). About heating rate and time required to reach the sintering temperature, they're obviously linked (if you choose 10 °C/min it will requires about 2 hours to reach 1300 °C from room temperature). By the way, in order to choose the right heating rate you should check first of all your furnace specifics (for the maximum heating rate allowed), then the literature suggestions (even though I think that 10 °C/min is a good compromise).
Finally, if you roughly know the grain size of your pellets, I could suggest you better
Regards
Luca
Dear Mahesh,
I think you are preparing ceramic materials.
If so, better go slow ramping like either 2o/min or 5oC/min. Slow heating gives good micro structure and density.
Better you can go for 2 h dwell time.
Cf.:
G.V. Samsonov, V.I. Konstantinov, "Tantalum and Niobium" (Engl. transl.: 'Tantal i Niobiy', Metallurgizdat Press, Moscow, 1959), Liaison Office, Defense Technical Information Center MCLTD, Wright-Patterson Air Force Base (Ohio), [Report ref.] MCL-656/I, Aug. 1960; apud: O.P. Kolobin, N.P. Chuvrelove, Nonferrous Metals, 1957 (12), 65.
O.P. Kolchin, 'Sintered niobium', pp. 3623-3624 (III-78s / III-78s1), in: "Encyclopedia of Contemporary Engineering" ― 'Structural Materials', Part IV: 'Nickel thru soft magnetic materials' (Engl. transl.: "Entsiklopediya Sovremennoy Tekhniki" ― 'Konstruktsionnyye Materialy', Moskva, 1965), [Report ref.] FTD-TT-66-22, Foreign Technology Division, Air Force Systems Command, 1967.
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