Preparation of MgO-Mg2TiO4 Composite and Its Corrosion Resistance to Electrolyte

MgO- Mg2TiO4 composite was prepared by adding chemically pure TiO2（0,1%,2%,5% and 10%,in mass,the same hereinafter） to light-burned magnesia（particle size 〈0.045 mm）,ball milling,dry pressing,and reaction sintering at 1 400,1 500 and 1 600 ℃ fo3 h,respectively. Apparent porosity,bulk density and corrosion resistance to AlF3- Na3AlF6- K3AlF6 were in vestigated. Phase composition and microstructure wer analyzed. The results show that：（1） MgO- Mg2TiO4 composite can be synthesized by reaction sintering; with TiO2 addition increasing from 0 to 5%,the specimen i denser obviously accompanying with more Mg2TiO4 form ing and MgO grains growing; the specimen with 10%TiO2obtains a slightly lower density than that with 5%TiO2due to larger volume expansion resulting from th formation of more Mg2TiO4;（2）with TiO2 addition in creasing from 0 to 5%,corrosion resistance to AlF3-Na3AlF6- K3AlF6 of the specimens improves gradually owing to the density increase and the Mg2TiO4 possessing good chemical stability distributing along periclas grains; compared with the specimen with 5% TiO2,tha with 10% TiO2 owns a little worse corrosion resistanc because of the lower density.