Pressureless sintering of gelcast ZTA–MgO–TiO2 systems as potential dental ceramics
Pressureless sintering of gelcast ZTA–MgO–TiO2 systems as potential dental ceramics
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DOI：
10.1179/1743676111y.0000000010
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发表时间：
2011-07
影响因子：
2.2
通讯作者：
J. F. Ma;S Q Wang;R X Du;X D Li
中科院分区：
文献类型：
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作者：
J. F. Ma;S Q Wang;R X Du;X D Li
研究了添加5wt%的氧化镁和二氧化钛的凝胶注塑氧化锆增韧氧化铝(ZTA)的常压烧结行为。在1150~1600℃温度范围内，以纯ZTA为对照，研究了四种不同的氧化镁和二氧化钛组合对ZTA复合材料的块体性能、形貌和相组成的影响。扫描电子显微镜的相对密度、三点弯曲强度测试和断口形貌观察表明，四种氧化镁和二氧化钛的组合在1450℃开始了有效的致密化和增强。X-射线衍射仪分析表明，四组ZTA复合材料抗弯强度的差异是由于少量的镁铝氧化物和二氧化钛诱导的四方相向单斜晶系的多晶型转变所致。这些结果对进一步开发牙科陶瓷，包括玻璃渗透ZTA是有用的。
The pressureless sintering behaviour of gelcast zirconia toughened alumina (ZTA) containing the total 5 wt-% additives of MgO and TiO2 was investigated. The effects of four combinations of MgO and TiO2 on the bulk properties, morphology and phase composition of the ZTA composites were evaluated in comparison with pure ZTA in the temperature range of 1150–1600°C. Four combinations of MgO and TiO2 initiated effective densification and enhancement at 1450°C, as indicated by the relative density and three-point bending strength measurements and fracture morphological observations by using scanning electron microscopy. X-ray diffraction analyses confirmed that the difference in the bending strength among four groups of ZTA composites was due to the MgO dependent formation of minor MgAl2O4 and TiO2 induced polymorphic transformation of tetragonal phase to monoclinic ZrO2. These results are useful to further develop dental ceramics, including glass infiltrated ZTA.