Al₂O₃-based composite ceramics have excellent high temperature performance and are ideal materials for preparing hot end components. However, poor fracture toughness and thermal shock resistance limit its applications. Based on the excellent low thermal expansion characteristics and thermal shock resistance of Al₂TiO₅ ceramic, different composition ratios of Al₂O₃/Al₂TiO₅ composite ceramics were prepared by directed laser deposition (DLD) technology. Effects of TiO₂ doping amount on microstructure and properties of the composite ceramics were investigated. Results show that α-Al₂O₃ phase is discretely distributed in the continuous aluminum titanate matrix when TiO₂ doping amount between 2 and 30 mol%. With the increase of TiO₂ doping amount, content of Al₂O₃ gradually decreases and its morphology changes from cellular to dendritic. When TiO₂ doping amount reaches 43.9 mol%, the microstructure transforms into fine Al₂TiO₅/Al₆Ti₂O₁₃ eutectic structure. Property test results show that Al₂O₃/Al₂TiO₅ composite ceramics have good comprehensive mechanical properties when TiO₂ doping amount between 2 and 6 mol%.

Al ₂ O ₃基复合陶瓷具有优异的高温性能，是制备热端部件的理想材料。然而，差的断裂韧性和耐热冲击性限制了其应用。基于Al ₂ TiO ₅陶瓷优异的低热膨胀特性和耐热冲击性，通过定向激光沉积（DLD）技术制备了不同组成比的Al ₂ O ₃ / Al ₂ TiO ₅复合陶瓷。研究了TiO ₂掺杂量对复合陶瓷组织和性能的影响。结果表明，α-Al系₂ ö₃相离散分布在连续的钛酸铝基质的TiO时₂之间2和30摩尔％的掺杂量。随着TiO ₂掺杂量的增加，Al ₂ O _3的含量逐渐降低，其形态从蜂窝状变为树枝状。当TiO ₂掺杂量达到43.9mol％时，显微组织转变成精细的Al ₂ TiO ₅ / Al ₆ Ti ₂ O ₁₃共晶结构。性能测试结果表明，Al ₂ O ₃ / Al ₂ TiO ₅当TiO _2的掺杂量为2至6 mol％时，复合陶瓷具有良好的综合机械性能。