MgO、Y_2O_3对AlON透明陶瓷粉体合成的影响及其密实化研究

Effects of MgO,Y_2O_3 on Preparation of AlON Powder and Densification of AlON Ceramic

采用固相反应法合成γ-AlON粉体,并利用无压烧结制备γ-AlON透明陶瓷。重点研究了MgO、Y_2O_3添加剂的引入对固相反应合成γ-AlON粉体的合成温度、物相组成的影响及其规律,并尝试性地探讨其反应机理。结果表明,MgO的加入可以起到降低反应温度的作用,使AlON的合成温度降低至1500℃,且合成产物物相纯度较高;而Y_2O_3的添加会促进氮化,使原料中的Al2O3被显著氮化。在此基础之上,以添加MgO的γ-AlON合成粉体为原料进行烧结致密化,并优化了烧结工艺。测试结果表明,在最佳烧结工艺下制备的样品致密度高,在2.5～6μm的红外波段内可透光,最高透过率可达22.12%。

Aluminum oxynitride（γ-AlON）powders were prepared by solid-state reaction processing and then sintered by pressureless sintering.The effects of MgO and Y_2O_3 on the solid reaction temperature and resultant phase compositions were investigated systematically.And the reactive mechanism was tentatively explored.The experimental results indicate that the solid reaction temperature for AlON decreased to 1500℃ by the addition of MgO,and the product added MgO has high phase purity;nitridation of Al2O3 promoted by the addition of Y_2O_3.Thenγ-AlON ceramics were sintered withγ-AlON powders added MgO as starting materials and sintering processes were optimized.the sample sintered under optimum conditions has best performances,with a maximum transmittance of about 22.12%and a transmitting wavelength range of 2.5μm to 6μm confirmed by IR results.