【摘要】 利用原位分解合成法，以轻烧MgO、Fe₂O₃和Al（OH）₃为原料，成功制备了多微孔方镁石-镁铁铝复合尖晶石陶瓷，并研究原料组成对其显微结构与性能的影响。研究结果表明：当理论镁铁铝复合尖晶石含量为0%（质量分数，下同）时，试样中颈部连接形成较少，耐压强度较低；当理论镁铁铝复合尖晶石含量为4%～16%时，试样中生成的液相量增多，物质运输速率加大，形成的颈部连接较多，耐压强度较高；当理论镁铁铝复合尖晶石含量为24%时，试样中镁铁铝复合尖晶石生成带来的体积膨胀增多，增大颗粒间距，颈部连接的形成减少，试样的耐压强度减小。同时，当理论镁铁铝复合尖晶石含量为12%～16%时，多微孔方镁石-镁铁铝复合尖晶石陶瓷具有较高的显气孔率（22.3%～24.6%）、较低的体积密度（2.75～2.80 g/cm³）和较高的耐压强度（100.6～123.1 MPa）。更多还原

【Abstract】 In the work, microporous periclase-composite spinel（Mg（Fe, Al）₂O₄） ceramics was successfully prepared using calcined MgO, Fe₂O₃ and Al（OH）₃ as raw materials by in-situ decomposition synthesis. Meanwhile, the effects of raw material on its microstructures and properties were studied. The results show that when the periclase-composite spinel（Mg（Fe, Al）₂O₄） content is 0%（mass fraction, the same below）, less neck connection form in the sample as well as the compressive strength is low. When the theoretical periclase-composite spinel（Mg（Fe, Al）₂O₄） content is 4%～16%, the content of the liquid increases and the mass transport accelerates. Then, lots of neck connections form and the compressive strength is high. When the theoretical periclase-composite spinel（Mg（Fe, Al）₂O₄） content is 24%, the expansion amounts caused by the formation of composite spinel increase so the inter-particle pore size increases and the neck connections decrease. Therefore, the compressive strength of the sample decreases. When the theoretical periclase-composite spinel（Mg（Fe, Al）₂O₄） content is 12%～16%, microporous periclase-composite spinel（Mg（Fe, Al）₂O₄） ceramics has excellent comprehensive properties, the apparent porosity of 22.3%～24.6%, the bulk density of 2.75～2.80 g/cm³, the compressive strength of 100.6～123.1 MPa.更多还原