| Fabrication and Mechanical Property Studies of
Thoria Stainless Steel Cermets |
R. BHATNAGAR, A. R. DAS AND M. L. VAIDYA
Pages : 32-35
DOI : 10.1080/0371750X.1989.10822937 |
| Abstract |
| Thoria powder of -100 to + 170 mesh prepared by crushing presintered
compacts was soaked with nickel salt by digestion in an aqueous
solution of Ni(N03) 2.7H20 for 1 hr at 80°C followed by
dropwise addition of Na2C03 when the reaction was completed. The
powder was separated, dried and reduced in H 2 at 500oC for 4 hours.
The nickel content of the powder was 30 wt% and its density 9.46
gm.cm-•. It was mixed with ferritic stainless steel (SS) powder of
-100 mesh into 4 compositions (0, 30, 45 and 60 ~,;; by wt thoria and
balance SS) and hot pressed into pellets of 12.7 mm dia x 8 mm ht
at 1030°C to relative densities ranging from 96 to 86% of theoretical.
Optical micrographs of polished surfaces indicate SS matrix as continuous
with discrete pore and thoria powder phases and that the coatings
are continuous with the matrix. Compressive tests on lnstron
Material Tester determined 0.2% proof stress, deformation, modulus
of elasticity and ultimate strength at room temperature. Brinell
hardness was determined at room temperature and at 664 K and
creep rates at 664 K were deduced from hardness time behaviour. |
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