Effect of TiO2 Sintering Assistant Addition and Sintering System on Sintering Densification Behavior of Chromium Oxide
Cr2O3 material was prepared under different temperatures(1 000-1 500 ℃)and different protective atmospheres(argon,nitrogen)by using Cr2O3 powder as raw material and TiO2 powder as sintering assistant.The effect of TiO2 addition(0,1％,3％,5％,5％,mass fraction),sintering temperature and sintering atmosphere on sintering densification behavior of Cr2O3 was analyzed.The results show that with the increase of TiO2 addition,the linear shrinkage rate and relative density of the sample increased,and the densification degree increased.When the TiO2 addition was 5％,the linear shrinkage rate and relative density reached the maximum,which were 16.25％and 92.51％,respectively.After adding TiO2,(Cr0 88Ti012)2O3 replacement solid solution was formed to improve the diffusion mass transfer rate and promote sintering densification.With the increase of sintering temperature,the sintering densification degree of Cr2O3 first increased and then decreased,and reached the maximum at 1 300 ℃.After sintering in nitrogen atmosphere,the Cr2N film was formed on the surface of Cr2O3 particles after sintering in nitrogen,which could play a similar role to the liquid phase and improve the sintering speed,the Cr2O3 prepared was denser than that prepared in argon atmosphere.
Cr2O3 materialsintering assistantsintering temperature
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