期刊导航

论文摘要

MgO和TiO2烧结助剂对凝胶注模成型氧化锆增韧氧化铝陶瓷性能的影响

Influence of MgO and TiO2 on mechanical properties of zirconia toughened alumina ceramics formed by gel-casting technique

作者:王思钱 王薇 杜若茜 张大风 刘传通 麻健丰

Author:WANG Si-qian, WANG Wei, DU Ruo-xi, ZHANG Da-feng, LIU Chuan-tong, MA Jianfeng

收稿日期:2009-06-25          年卷(期)页码:2009,27(03):335-

期刊名称:华西口腔医学杂志

Journal Name:West China Journal of Stomatology

关键字:氧化锆增韧氧化铝陶瓷,凝胶注模成型,纳米复合陶瓷,

Key words:zirconia toughened alumina ceramics,gel-casting,nano-compound ceramics,

基金项目:

国家自然科学基金资助项目(30870632);温州市科技局对外科技合作交流资助项目(H20070038)

中文摘要

目的探讨加入氧化锆增韧氧化铝(ZTA)基体粉体质量分数5%的烧结助剂对凝胶注模成型工艺制备牙科ZTA纳米复合陶瓷烧结性能和力学性能的影响。方法将微米氧化铝和纳米氧化锆按质量比4∶1配置体积分数为55%的浆料,同时加入基体粉体质量分数5%的烧结助剂MgO、TiO2,按二者比例的不同分0、1、2、3、4号组。各组凝胶注模成型后,分别在1 150、1 200、1 300、1 400、1 450、1 500、1 600 ℃下保温2 h,冷却后取出抛光,测其三点抗弯强度、线收缩率、相对密度,扫描电镜观察其断面形态。结果添加1%MgO和4%TiO2烧结助剂组(1号组)具有最高的抗弯强度,1 600 ℃保温2 h后达(401.78±19.50)MPa,高于0号组(380.64±44.50)MPa。MgO含量为基体粉体质量分数2%及以上时,对烧结致密后陶瓷的抗弯强度起降低作用,均比0号组低。MgO含量高于2%及以上,含烧结助剂各组相对密度升高的速率没有明显的区别。烧结温度高于1 200 ℃后各组均出现明显的收缩,且含烧结助剂组均高于0号组。结论含1%MgO和4%TiO2烧结助剂的ZTA纳米复合陶瓷具有最佳的力学性能。MgO含量为基体粉体质量分数2%及以上时,对ZTA纳米复合陶瓷相对密度速率的提高没有明显的作用,且对ZTA纳米复合陶瓷的力学性能起降低作用。

英文摘要

Objective The objective of this study is to investigate the influence of mechanical properties and sintering performance by adding 5% weight percentage aids to nano-compound zirconia toughened alumina(ZTA) ceramics. Methods Micrometer Al2O3 and nanometer ZrO2(quality ratio 4 ∶ 1) were used to get 55% volume percentage slurry. Magnesium oxide and titanium oxide were taken as aids which were 5% weight percentage of the Al2O3 and ZrO2 powder. Five groups(number 0, 1, 2, 3, 4 group) were divided according to different proportion of aids. After gel-casting, the porcelain pieces were sintered at 1 150, 1 200, 1 300, 1 400, 1 450, 1 500, 1 600 ℃ for 2 hours. Static three-point flexure strength, line shrinkage, relative density were measured and scanning electron microscopy(SEM) was used to observe section. Results Number 1(MgO 1%, TiO2 4%) group had the highest bending strength. It was (401.78±19.50)MPa after sintering at 1 600 ℃ for 2 hours and was higher than 0 group (380.64±44.50)MPa. Bending strength became lower than 0 group when MgO was more than 2% or more than that weight percentage of ZTA powder. When MgO content was higher than 2% or more than that weight percentage, there was no difference in relative density raising rate between each sintering assistants groups. When the sintering temperature was higher than 1 200 ℃, all groups showed obvious line-shrinkage and the groups which contained sintering assistants were all was higher than 0 group. Conclusion Adding MgO and TiO2 aids from 1% to 4% weight percentage of ZTA will promote fritting and increase ZTA nano -compound ceramics mechanical properties. Adding 2% MgO aids or more than that weight percent will has no obvious help to increase the relative density raising rate of ZTA nano -compound ceramics and will degrade the mechanical properties of ZTA nano-compound ceramics.

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