固相反应法和碳热还原氮化法制备AlON陶瓷

发布时间：2018-02-06 05:29

本文关键词： AlON透明陶瓷固相反应法碳热还原氮化法烧结助剂　出处：《江苏大学》2015年硕士论文　论文类型：学位论文

【摘要】：立方尖晶石型氮氧化铝(AlON)是Al2O3-AlN体系中一个重要的单相,稳定的的固溶体陶瓷,具有和蓝宝石相媲美的光学和机械性能,是一种新型的结构、功能一体化材料。AlON透明陶瓷可以应用于窗口、整流罩、装甲和红外探测等领域,具有很大的应用前景。本论文首先以商业Al2O3和Al N为原料粉体,通过固相反应法制备了AlON陶瓷,研究了不同比例的Al2O3/Al N粉体对陶瓷物相的影响。结果表明,Al N为28-32 mol%的混合粉体所制备的陶瓷为单相AlON。此外,还分别添加了Y2O3、MgO和La2O3等烧结助剂,研究了不同掺杂量的烧结助剂对陶瓷致密化行为和微观结构的影响规律。结果表明,MgO烧结助剂的添加有利于陶瓷的致密化且可以抑制晶粒长大。另外,以商业γ-Al2O3和纳米碳为原料粉体,通过碳热还原氮化法(CRN)制备AlON粉体,研究了不同比例的γ-Al2O3/C粉体对粉体物相、粒径和比表面积的影响规律。并在不同温度下对AlON粉体进行烧结。结果表明,当碳含量为5.4-6.0 wt%时,可制备出高纯相AlON粉体。
[Abstract]:Cubic spinel alumina nitride (Alon) is an important single phase and stable solid solution ceramic in Al2O3-AlN system. It has the same optical and mechanical properties as sapphire. Alon transparent ceramics can be used in window, fairing, armor and infrared detection. In this thesis, commercial Al2O3 and Al N were used as raw materials to prepare AlON ceramics by solid state reaction. The effect of different proportion of Al2O3/Al N powder on the phase of ceramics was studied. The ceramic prepared by the mixed powder with 28-32 mol% Al N is single phase AlON. In addition, the sintering aids such as Y 2O 3, MgO and La2O3 are added respectively. The effects of different doping amount of sintering additives on the densification behavior and microstructure of ceramics were studied. The results show that the addition of MgO sintering aids is beneficial to the densification of ceramics and can inhibit grain growth. Commercial 纬 -Al _ 2O _ 3 and nano-carbon were used as raw materials to prepare AlON powder by carbothermal reduction and nitridation. The phase of 纬 -Al _ 2O _ 3 / C powder was studied. The effect of particle size and specific surface area on the AlON powder was studied. The results showed that the high-purity AlON powder could be prepared when the carbon content was 5.4-6.0 wt%.
【学位授予单位】：江苏大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ174.6

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