【摘要】 由于ZrB₂具有极高的熔点、强度、硬度和导电率等许多优异性能,因而其应用领域非常广泛。研究了ZrB₂-Si₃N₄复相陶瓷的制备和高温下的氧化机理。结果表明,在1700℃、15MPa、2h烧结条件下制备的ZrB₂-20%Si₃N₄复相陶瓷的致密度为98%左右。ZrB₂-Si₃N₄复相陶瓷在高温氧化时生成了SiO₂,并且SiO₂液相容易在复相陶瓷表面富集形成一层保护膜,有望提高陶瓷在更高氧化温度下的抗氧化性能。更多还原

【Abstract】 ZrB₂ is widely applied because of some excellent performances,such as high melting point,strength, hardness and conductivity.Preparation and oxidation mechanism of ZrB₂-Si₃N₄ multi-phase ceramics are researched, which helps to improve the performance of high-temperature and ultra-high-temperature ceramics.The results show that the relativite density of ZrB₂-20%Si₃N₄ multi-phase ceramics is 98%at 1700°C,15MPa,2h.SiO₂ is produced from oxidized ZrB₂-Si₃N₄ multi-phase ceramics at high temperature,SiO₂ is easily enriched on the ceramic surface to form a protecting layer,which is helpful to increase the antioxygenic property of ZrB₂-Si₃N₄ multi-phase ceramics at higher oxidized temperature.更多还原