Abstract
To explore the densification of HfO2-ThO2 multiphase oxides and their application prospects in high-temperature environments (over 2500 °C), the sintering promoting mechanism of HfO2-ThO2 multiphase oxides with different sintering additives was systematically studied. By means of XRD, SEM and EDS, the microstructure evolution of HfO2-ThO2 multiphase oxides during sintering was studied, and the sintering promoting effects of sintering additives on the multiphase oxides were systematically explored. The results showed that among the six sintering additives, the HfO2-ThO2 multiphase oxides prepared by using Al2O3 as a sintering additive at 1700 °C under atmospheric pressure had a relative density of nearly 97% and a porosity as low as 2%. By increasing the lattice activity of HfO2, the sintering driving force was increased, and the sintering densification of the multiphase oxides improved. After 30 s of ablation at 2610 °C, compared with HfO2-ThO2 multiphase oxides without sintering additives, the mass ablation rate of the sample with Al2O3 as a sintering additive was reduced by 47.1%. A stable compact structure in which low melting point sintering additives connected the grain boundary to seal the cracks and the high melting point ThO2 phase nailed the triaxial grain boundary was formed in the ablation central region, which has broad application prospects in the field of high temperature sintering.
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