A novel oxide composite reinforced with a ductile phase for very high temperature structural materials
A novel oxide composite reinforced with a ductile phase for very high temperature structural materials
复制标题
一种用于超高温结构材料的韧性相增强的新型氧化物复合材料
DOI：
10.1007/s100190100131
复制
发表时间：
2001
期刊：
影响因子：
--
通讯作者：
K. Shimizu
中科院分区：
文献类型：
--
作者：
Y. Waku;S. Sakata;A. Mitani;K. Shimizu
随着温度的升高，几乎所有金属和陶瓷多晶材料的强度都会迅速下降。本文采用Al_2O_3-Y_3Al_5O_(12)(Y_3Al_5O_(12))-ZrO_2三元共晶混合物定向凝固的方法，制备了一种在1873K下具有不同显微组织的韧性相增强的强韧氧化物复合材料。该复合材料具有由单晶Al_2O_3、单晶Y_2O_3和单晶c-ZrO_2组成的无晶界互穿网络的微观结构。在这些相之间的界面上没有观察到非晶相，并形成了相对相容的界面。这种材料在1873K时表现出塑性变形，表明具有高屈服弯曲强度。该复合材料在1873K时的平均弯曲强度约为850 Mpa，约为相同成分烧结复合材料的57倍，1873K时的延性断裂至今未见报道。因此，在机械工程中可以考虑几个有用的应用。
The strength of nearly all metallic and ceramic polycrystalline materials drops off rapidly with increases in temperature. Here we have developed a strong and tough oxide composite reinforced with a ductile phase at 1873 K with a different kind of microstructure, made by unidirectional solidification of an Al2O3-Y3Al5O12(YAG)-ZrO2ternary eutectic mixture. This composite has a microstructure in which continuous networks of single-crystal Al2O3, single-crystal YAG and single-crystal c-ZrO2interpenetrate without grain boundaries. No amorphous phases are observed at the interfaces between these phases and relatively compatible interfaces are formed. This material displays plastic deformation at 1873 K indicating high yielding flexural strength. This composite's average flexural strength at 1873 K of around 850 MPa—approximately 57 times higher than that of the sintered composite with the same composition, and its ductile fracture at 1873 K have never been found up to now. Consequently several useful applications can be considered in mechanical engineering.
DOI：
10.1007/978-1-4613-2233-7
发表时间：
1986-12
期刊：
--
影响因子：
--
作者：
R. E. Tressler;G. Messing;C. Pantano;R. Newnham
通讯作者：
R. E. Tressler;G. Messing;C. Pantano;R. Newnham