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采用共沉淀法在1100℃制备了70%(体积分数,下同)氧化钇稳定氧化锆[xY2O3+(1-x)ZrO2,x=0.02,0.03,0.04,in mole,yttria stabilized zirconia,YSZ]-30%镁铝尖晶石(MgAl2O4)复合粉体,2种原始粉料的配料各为70%和30%,并在1200～1500℃常压烧成制备了陶瓷材料。结果表明:在制得的所有粉末中,未发现单斜相ZrO2;2YSZ(0.02Y2O3+0.98ZrO2,摩尔分数,下同)/MgAl2O4和3YSZ/MgAl2O4这2种粉体中的ZrO2为四方相多晶氧化锆;而4YSZ/MgAl2O4粉末中的ZrO2相为全稳定立方氧化锆。对于1500℃烧结制备的陶瓷材料,2YSZ/MgAl2O4块体中的ZrO2相为部分稳定氧化锆;而3YSZ/MgAl2O4和4YSZ/MgAl2O4块体中的ZrO2相为全稳定氧化锆。(2～4)YSZ/MgAl2O4复相陶瓷的活化能为(623±80)kJ/mol。
A 70% (volume fraction) yttria stabilized zirconia [xY2O3 + (1-x) ZrO2, x = 0.02,0.03,0.04, in mole, yttria stabilized zirconia, YSZ] 30% magnesium aluminate spinel (MgAl2O4) composite powder, the two raw materials were 70% and 30% respectively, and the ceramic materials were prepared by firing at 1200-1500 ℃ under atmospheric pressure. The results show that ZrO2 is not found in all the powders prepared. The ZrO2 in the two powders of 2YSZ (0.02Y2O3 + 0.98ZrO2, the mole fraction) and MgAl2O4 and 3YSZ / MgAl2O4 is tetragonal Crystalline zirconia; and 4YSZ / MgAl2O4 powder ZrO2 phase is fully stabilized cubic zirconia. For the ceramic materials prepared by sintering at 1500 ℃, the ZrO2 phase in 2YSZ / MgAl2O4 bulk is partially stabilized zirconia, while the ZrO2 phase in 3YSZ / MgAl2O4 and 4YSZ / MgAl2O4 bulk is fully stabilized zirconia. (2 ~ 4) The activation energy of YSZ / MgAl2O4 composite ceramics is (623 ± 80) kJ / mol.