La,Y掺杂对非晶晶化法制备ZrO2-mullite纳米复相陶瓷的影响  

Effect of La, Y Additions on ZrO_2-mullite Nano-composite Ceramics by In-situ Controlled Crystallizing from Si-Al-Zr-O Amorphous Bulk

作　　者：谭小平[1] 秦利平[1,2] 梁叔全[1] 

机构地区：[1]中南大学材料科学与工程学院,有色金属材料科学与工程教育部重点实验室,长沙410083 [2]广西科技大学科技处,柳州545006

出　　处：《无机材料学报》2016年第1期47-52,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金创新群体项目(50721003);湖南有色金属研究基金(YSZN2013CL07)

摘　　要：借助DSC、XRD、SEM和TEM等技术探讨了La2O3、Y2O3掺杂对非晶晶化法制备ZrO2-mullite纳米复相陶瓷的影响。结果表明,当Y2O3和La2O3的掺杂量分别小于4wt%和1.8wt%时,能有效降低Si-Al-Zr-O系非晶的熔制温度,抑制冷却过程中的失透现象,有利于非晶形成且不影响主晶相的析出。单一Y2O3掺杂时,Y主要固溶于氧化锆中,稳定t-ZrO2,且抑制堇青石析出,对晶粒大小影响不大;而Y2O3和La2O3混合掺杂时,Y和La主要存在于玻璃相中,强化晶界,且La能明显促进ZrO2、mullite晶粒长大。Y2O3和La2O3的合适添加量分别为1.0wt%～2.0wt%和0.6wt%～1.2wt%。Effects of Y2O3 and La2O3 doping on ZrO2-mullite nano-composite ceramics, prepared by in-situ con- trolled crystallizing from the Si-A1-Zr-O amorphous bulk, were revealed by means of DSC, XRD, SEM and TEM technologies. The results indicate that the addition of Y2O3 and La2O3 （Y2O3 〈l.8wt% and La2O3 〈4wt%） can effec- tively reduce the melting temperatures of Si-A1-Zr-O based amorphous, limit the devitrification phenomenon and is beneficial for the formation of amorphous during cooling process, without changing the main crystalline phase pre- cipitation. For Y2O3 single doping, Y is mainly dissolved in the zirconium oxide, stabilizes t-ZrO2, and inhibits pre- cipitation of the cordierite, and exerts little effect on the grain size. For both Y2O3 and La2O3 mixed doping, Y and La mainly locate in the glass phase, strengthen the grain boundary, of which La promotes the grain growth of ZrO2 and mullite. The appropriate doping amount of Y2O3 and La2O3 should be in the range of 1.0wt%-2.0wt% and 0.6wt%-l.2wt%, respectively.

关 键 词：掺杂 非晶晶化 结构变化 

分 类 号：TQ171[化学工程—玻璃工业]