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透明氧化铝陶瓷的制备及其性能研究

发布时间:2018-04-10 09:26

  本文选题:氧化铝 切入点:烧结助剂 出处:《西南科技大学》2017年硕士论文


【摘要】:氧化铝陶瓷因具有耐高温、耐腐蚀、优良的力学、光学等物理化学性能,使其在机械、半导体、电子、军工、医学等高科技新技术领域拥有广泛的应用前景。本文采用化学沉淀法引入烧结助剂Y3+,La3+和Mg2+,通过真空烧结工艺制备了透明氧化铝陶瓷。采用密度测试、X射线衍射仪(XRD)、能谱分析仪(EDS)、扫描电子显微镜(SEM)、紫外红外分光光度计及压痕法等对样品形貌、结构、光学和力学性能等进行了测试和表征,分析了烧结助剂及其引入方式对氧化铝陶瓷光透过率的影响。此外,本文采用溶胶-凝胶法,以异丙醇铝为原料,制备了稳定的勃姆石溶胶,并通过旋涂法制备了氧化铝陶瓷膜。采用傅里叶红外光谱仪(FT-IR)、XRD、SEM及原子力显微镜(AFM)等分析了影响勃姆石溶胶稳定性和成膜情况的因素。实验结果表明,采用化学沉淀法引入的烧结助剂可以均匀的分布在氧化铝陶瓷中,不存在团聚和出现第二相的情况。Y3+掺量的增加可以促使氧化铝陶瓷晶粒生长,降低其气孔率,提高样品的透光率。烧结助剂Mg2+,Y3+和La3+的最佳掺入量分别为0.15 wt%,0.05 wt%和0.05 wt%,该掺量时获得的氧化铝陶瓷样品的晶粒尺寸均一,大小约为25-30μm,且没有气孔存在;其相对密度为99.62%,总透光率在350-800nm波长区域内大于80%。此外,由于Y和Mg含量的增加对样品的微观结构的影响不同,使得样品的维氏硬度随着Y含量的增加而有所增大,Mg对样品的维氏硬度几乎没有影响。采用溶胶-凝胶法配制勃姆石溶胶,当n(Al(C3H7O)3)∶n(H2O)∶n(HNO3)=1∶100∶0.3时,制备了淡蓝色透明溶胶,其表现出最佳的稳定性;优化溶胶膜的热处理工艺,防止烧结过程中膜破裂脱落,制备的膜样品表面光滑平整,均方根粗糙度(RMS)约为3.2nm,获得的陶瓷膜主晶相为α-Al_2O_3。
[Abstract]:Because of its high temperature resistance, corrosion resistance, excellent mechanical, optical and other physical and chemical properties, alumina ceramics have a wide range of applications in new high-tech fields such as machinery, semiconductor, electronics, military industry, medicine and so on.In this paper, transparent alumina ceramics were prepared by vacuum sintering with the addition of Y _ 3 La _ 3 and Mg2 by chemical precipitation.The morphology, structure, optical and mechanical properties of the samples were measured and characterized by density measurement X ray diffractometer, energy spectrum analyzer EDSX, scanning electron microscope (SEM), UV infrared spectrophotometer and indentation method.The effects of sintering aids and their introduction methods on the optical transmittance of alumina ceramics were analyzed.In addition, stable bauxite sol was prepared by sol-gel method and aluminum isopropanol as raw material, and alumina ceramic membrane was prepared by spin-coating method.The factors influencing the stability and film formation of Bohmite sol were analyzed by Fourier transform infrared spectrometer (FT-IR) and atomic force microscope (AFM).The results show that the sintering aids introduced by chemical precipitation method can distribute uniformly in alumina ceramics, and the increase of the content of Y3 and agglomeration can promote the grain growth and decrease the porosity of alumina ceramics.Improve the transmittance of the sample.The optimum blending amount of Mg2 Y3 and La3 is 0.15 wt% and 0.05wt%, respectively. The grain size of the alumina ceramics obtained by this addition is uniform, about 25-30 渭 m, and there is no porosity.The relative density is 99.62 and the total transmittance is greater than 80 in the 350-800nm wavelength region.In addition, the Vickers hardness of the samples increases with the increase of Y content, and mg has little effect on the Vickers hardness because the increase of Y and mg contents have different effects on the microstructure of the samples.When n(Al(C3H7O)3):n(H2O):n(HNO3)=1:100:0.3 was used, the light blue transparent sol was prepared, which showed the best stability, and the heat treatment process of the sol film was optimized to prevent the film from breaking and falling off during sintering.The surface of the prepared films is smooth and smooth, the RMS of RMS is about 3.2 nm, and the main crystal phase of the ceramic membranes is 伪 -Al _ 2O _ 3.
【学位授予单位】:西南科技大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TQ174.758.11

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