【摘要】 采用自蔓延燃烧合成法在室温下的空气中制备出了TiB₂/Al₂O₃复相陶瓷,通过X射线衍射（XRD）和扫描电镜（SEM）分析表明TiB₂的形貌为规则的块状,晶粒细小,平均尺寸为几个微米,弥散的分布在晶粒较大的Al₂O₃四周,而Al2O3的颗粒较大（50μm左右）,形状不规则。原料组成、加压延迟时间、高压持续时间等是影响TiB₂/Al₂O₃复相陶瓷性能的主要因素。通过本试验制备出的TiB₂/Al₂O₃复相陶瓷,综合了多相复合、SHS技术,原位合成技术、热等静压技术、金属增韧等技术,使TiB₂/Al₂O₃复相陶瓷既具有高强度,又拥有适度的韧性。更多还原

【Abstract】 TiB₂/Al₂O₃ composite was produced by Self-propagating high temperature combustion synthesis。By means of XRD and SEM,we can know the final main resultant were TiB₂ and Al₂O₃.The particles of TiB₂ which dispersed mainly in the Al₂O₃ matrix were fine and presented regular rectangle shape,but the sizes of Al₂O₃ were bigger than TiB₂ and shape was not regular. The constitute of raw materials,the deferring time of adding pressure,standing time on high pressure etc are main factors which influence capability of TiB₂/Al₂O₃ ceramic. Colligating polyphase recombination,SHS technology,in-situ synthesis technology,high temperature insostatic pressing technology and metal phase adding tenacity etc,so TiB₂/Al₂O₃ composite holds high strength and moderate tenacity.更多还原