SINTESA DAN KARAKTERISASI PADUAN ZrNbMoGe UNTUK MATERIAL KELONGSONG BAHAN BAKAR NUKLIR
Keywords:
synthesis, zirconium, cladding, rollAbstract
Synthesis of ZrNbMoGe alloy used for nuclear fuel cladding material was performed by melting and hot rolling processes to produce thin plates of 1.4 mm thickness. The melting process was done by melting the elements of ZrNbMoGe alloy using an arc melting furnace with compositions (weight percentage) of 97.5% Zr, 1% Nb, 1% Mo and 0.5% Ge. The hot rolling process was done at temperatures of 800 oC and 850 oC with reduction ratios of 5% for each step. Result of the characterizations showed that the hardness of ingot and plate of ZrNbMoGe alloy were 199 VHR and 188 VHR respectively. These are higher than the hardness of the cladding material of Zircaloi-4. Increasing of hardness was believed due to the formation of hard precipitates of Zr3Ge in the ingot during the melting process which was observed by precipitate analysis using SEM-EDX and XRD tests. The corrosion tests in deminwater environment showed relatively low corrosion rate of 0.0457 MPY, while the high temperature oxidation test at 800 oC for 36 hours gave additional weight of 0.0959 mg/cm2, similar to that of zirkaloi-4 at 0.1105 mg/cm2.
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