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Preparation of Y2O3 Doped SrZrO3 Refractory and Study on its Interface Reaction with Molten TiNi Alloys

Y2O3 doped SrZrO3(SZY) powders were prepared according to a solid-state reaction method, which the raw materials contains SrCO3, ZrO2 and doped with 5 mol% Y2O3. And then the powders were used to make a green crucible shape by cold isostatic pressing. After that, the crucible was used to melt with TiNi alloy in the vacuum induction furnace with biscuit firing temperature of 900°C, and sintering temperature of 1750°C. The x-ray diffraction analysis (XRD), scanning electron microscope (SEM), and energy dispersive X-ray spectroscopy (EDS) were used to analysis the characterization of the Y2O3 doped SrZrO3 power; microstructure of the crucible at different holding time under the 1750°C and the interfacial reaction between the crucible and the TiNi alloy. The results showed that the powders of Y2O3 doped SrZrO3 were synthesized at 1200°C, and there was no obvious reaction layer and elements diffusion between the crucible and TiNi alloy. The ingot is easy to separate from the crucible after smelting.