Formation and Corrosion.pdf (3.04 MB)
Download fileFormation and Corrosion of a 410 SS/Ceramic Composite.
journal contribution
posted on 2017-11-20, 00:00 authored by Chen X, Ebert WL, Indacochea JEThis study addressed the possible use of alloy/ceramic composite waste forms to immobilize metallic and
oxide waste streams generated during the electrochemical reprocessing of spent reactor fuel using a
single waste form. A representative composite material was made to evaluate the microstructure and
corrosion behavior at alloy/ceramic interfaces by reacting 410 stainless steel with Zr, Mo, and a mixture
of lanthanide oxides. Essentially all of the available Zr reacted with lanthanide oxides to generate
lanthanide zirconates, which combined with the unreacted lanthanide oxides to form a porous ceramic
network that filled with alloy to produce a composite puck. Alloy present in excess of the pore volume of
the ceramic generated a metal bead on top of the puck. The alloys in the composite and forming the bead
were both mixtures of martensite grains and ferrite grains bearing carbide precipitates; FeCrMo intermetallic
phases also precipitated at ferrite grain boundaries within the composite puck. Micrometerthick
regions of ferrite surrounding the carbides were sensitized and corroded preferentially in electrochemical
tests. The lanthanide oxides dissolved chemically, but the lanthanide zirconates did not
dissolve and are suitable host phases. The presence of oxide phases did not affect corrosion of the
neighboring alloy phases.