XRD investigation of the Effect of MgO Additives on ZTA-TiO2 Ceramic Composites

International Conference on Advances in Manufacturing and Materials Engineering 2017

机械制造;材料科学

Azhar, Ahmad Zahirani Ahmad^1 ; Manshor, Hanisah^2 ; Ali, Afifah Mohd^1

Department of Manufacturing and Materials Engineering, International Islamic University Malaysia (IIUM), Jalan Gombak, Kuala Lumpur

53100, Malaysia^1

Department of Science in Engineering, International Islamic University Malaysia (IIUM), Jalan Gombak, Kuala Lumpur

53100, Malaysia^2

关键词: Ceramic composites;    Ceramics composites;    Grains refinement;    Monolithic ceramics;    Pressure-less sintering;    Secondary phase;    Shrinkage rates;    Yttria-stabilized zirconias (YSZ);   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/290/1/012046/pdf
DOI  :  10.1088/1757-899X/290/1/012046

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Alumina (Al2O3) based ceramics possess good mechanical properties and suitable for the application of cutting inserts. However, this monolithic ceramics suffer from lack of toughness. Hence, there are some modification were made such as the addition of yttria stabilized zirconia (YSZ) to the Al2O3helps in increasing the toughness of the Al2O3ceramics. Some additives such as MgO and TiO2were used to further improve the mechanical properties of ZTA. In this study, high purity raw materials which consist of ZTA-TiO2were mixed with different amount of MgO (0.0 - 1.0 wt %). The mixture of materials was going through wet mixing, compaction and pressureless sintering at 1600°C for one hour. The samples were characterized for phase analysis, microstructure, shrinkage rate, bulk density, Vickers hardness and fracture toughness. Based on the XRD analysis results, the secondary phase (MgAl2O4) was detected in the sample with 0.5 wt% of MgO onwards which leads to grains refinement, thus improve the density and hardness of ZTA-TiO2-MgO ceramics composites.