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ZrB2具有优良的物理特性和化学稳定性而应用于许多领域,但是ZrB2难以烧结致密和在高温条件下容易被氧化。为了充分发挥ZrB2的优点,改善ZrB2的缺点,本文采用共沉淀法制备壳核式Al2O3-Y2O3/ZrB2复合粉体,通过放电等离子烧结法制备高致密的ZrB2-YAG陶瓷。在相同实验条件下得到的纯ZrB2陶瓷的相对密度都很低,在85%以下。通过此种方法加入少量YAG后,烧结密度得到明显提高,随YAG添加量的增加相对密度增加。添加量超过30wt%后,可以达到几乎完全致密的ZrB2-YAG陶瓷。
ZrB2 is used in many fields because of its excellent physical properties and chemical stability. However, ZrB2 is difficult to sinter densely and is easily oxidized under high temperature conditions. In order to give full play to the advantages of ZrB2 and improve the defect of ZrB2, shell-core Al2O3-Y2O3 / ZrB2 composite powders were prepared by coprecipitation method and high density ZrB2-YAG ceramics were prepared by spark plasma sintering. Under the same experimental conditions, the relative density of pure ZrB2 ceramics is very low, below 85%. After adding a small amount of YAG by this method, the sintering density is obviously improved, and the relative density increases with the YAG addition amount. After adding more than 30wt%, almost completely dense ZrB2-YAG ceramic can be achieved.