多晶透明氧化铝陶瓷晶相结构及光谱特性的研究

以不同形貌的高纯氧化铝粉体及典型的氧化镁添加剂为原料,采用固相反应烧结法制备多晶透明氧化铝产品。运用SEM、能谱分析仪、光谱分析仪等手段,研究了多晶透明氧化铝晶体结构的影响因素和光谱特性。结果表明,组成球形状态的粒子,在后期烧结过程中更容易形成六面形晶体结构;低比表面积的粉体在后期加工中容易分散,晶体形状和结构更稳定,工艺易于控制;外加剂氧化镁在小于1 700℃时在晶界能比较高的非{0001}面生成镁铝尖晶石,从而对六边形晶体形状起到钉扎作用,有利于形成均匀的晶相结构;对于有定量添加剂的透明氧化铝陶瓷,380～780nm的可见光谱范围为透光率最高区,780～1 000nm为近红外次透过区。

Research on the Crystal Structure and Spectral Features of Polycrystal Transparent Alumina Ceramics

High purity alumina powder which have different appearances and MgO additives are used to prepare polycrystal transparent alumina ceramics by solid state reaction sintering.By means of SEM,energy spectrum analyzer and action spectrum analyzer,the crystal structure and spectral features of polycrystal transparent alumina ceramics are studied.It is found that the round-like particle is of benefit to making the hexagon crystals,the alumina powder with lower specific surface area is more in favor of the stabili...