Effects of Praseodymium Oxide on Properties of Magnesia Ceramics
Magnesia ceramics is made from magnesium oxide(MgO)powder as raw material,rare earth praseodymium oxide(Pr6O11)as additive,and polyvinyl alcohol(PVA)as binding agent,through dry-pressing molding and pressure-less sintering methods.We investigated the crystal phase,sintering properties,hardness,morphology and thermal shock resistance properties of MgO ceramics,which was made at the sintering temperature of 1 580℃ for 3 h.The Pr6O11 was added for investigation into the effect of different contents of RE oxides on sintering,hardness,and thermal shock resis-tance of MgO ceramics.The results showed that the Pr6O11 had certain enhancement effect on the sintering properties(density and shrinkage ratio)of MgO ceramics but not very much;however,the hardness and thermal shock resistance of MgO were significantly enhanced,and when the added Pr6O11 content was 8%,MgO ceramics enjoys the optimal hard-ness and thermal shock resistance properties,which were 60.1 HRA and 17 times,respectively.
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