氧化铝陶瓷又称半透明氧化铝陶瓷或透明多晶氧化铝陶瓷。主晶相为α-A12O3。密度3.98g/cm3以上。直线透光率90％～95％以上。介电常数大于9.8。介电损耗角正切值小于2.5×10-4(1GC)，抗弯强度大于350～380MPa。击穿强度6.0～6.4kV/mm。热膨胀系数(6.5～8.5)×10-6/℃。高温下具有良好耐碱金属蒸气腐蚀性。 　　
原料为纯度99.99％以上的Al2O3，添加少量纯氧化镁、三氧化二镧、或三氧化二钇等添加剂，采用连续等静压成型，气氛烧结或热压烧结，严格控制晶粒大小，可获得高致密透明陶瓷。用于制造高压钠灯的发光管(工作寿命可超过2万h)。也可用作微波集成电路基片、轴承材料、耐磨表面材料和红外光学元件材料等。（图/文www.yxwdcy.com）
中译英：
Alumina ceramic is also called translucent alumina ceramic or transparent polycrystalline alumina ceramics. The main crystalline phaseα -A12O3. The density of 3.98g/cm3and above. Linear transmittance90%～ 95% above. A dielectric constant greater than 9.8. Dielectric loss angle tangent value is less than2.5 × 10-4(1GC ), high temperature alkali metal vapor having good corrosion resistance.

Raw materials for the purity of more than 99.99% Al2O3, add a small amount of pure magnesium oxide, lanthanum oxide, three two or three two yttrium oxide additives, continuous isostatic pressing, sintering or hot pressing sintering atmosphere, strictly control the grain size, can obtain high dense transparent ceramics. Used in the manufacture of high pressure sodium lamp led. Can also be used as a microwave integrated circuit substrate, bearing material, wear-resistant surface materials and infrared optical material.