Effects of La_(2)O_(3) addition on microstructure development and physical properties of harder ZTA-CeO_(2) composites with sustainable high fracture toughness

作     者：Zhwan Dilshad Ibrahim Sktani Nik Akmar Rejab Abdul Fatah Zulkarnain Rosli Ali Arab Zainal Arifin Ahmad Zhwan Dilshad Ibrahim Sktani;Nik Akmar Rejab;Abdul Fatah Zulkarnain Rosli;Ali Arab;Zainal Arifin Ahmad

作者机构：Department of Mechanical and Energy EngineeringErbil Technical Engineering CollegeErbil Polytechnic UniversityErbil44001Iraq Structural Materials Niche AreaSchool of Materials and Mineral Resources EngineeringEngineering CampusUniversiti Sains Malaysia14300Nibong TebalPenangMalaysia State Key Laboratory of Explosion Science and TechnologyBeijing Institute of TechnologyBeijing 100081China 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2021年第39卷第7期

页      面：844-849,I0003页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 08[工学] 0708[理学-地球物理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 

基　　金：This work is financially supported by research university grant Universiti Sains Malaysia RUI 1001/PBAHAN/811212 teaching fellow scheme USM.9/25 Jld.ⅩⅢ 

主　　题：ZTA-CeO_(2) Ceramic composite Microstructural design Fracture toughness Vickers hardness Rare earths 

摘      要：The influence of La_(2)O_(3) inclusion(0-3 wt%) on the micro structure,phase formation and mechanical properties of zirconia toughed alumina(ZTA) added with 5.0 wt% CeO_(2) was *** CeO_(2) composites were sintered at 1600℃ for 4 *** microstructure,phase formation,density,fracture toughness and hardness properties were characterised through FESEM,Microscopy Image Analysis Software and XRD diffractometer,Archimedes principle and Vickers indentation technique,*** XRD,image processing and FESEM reveal the existence of LaAl_(11)O_(18).The addition of La_(2)O_(3) incites the sintering,microstructure refinement,densification of ZTA-CeO_(2) matrix and phase ***,the hardness of ZTA-CeO_(2) ceramics is increased rapidly based on refinement of Al_(2)O_(3) grains,densification of ZTA-CeO_(2) composites and porosity *** is observed that the fracture toughness is enhanced through in situ formation of elongated LaAl_(11)O_(18) *** addition of 0.7 wt% La_(2)O_(3) culminated in the achievement of the optimum findings for density(4.41 g/cm^(3)),porosity(0.46%),hardness(1792 HV) and fracture toughness(8.8 MPa·m^(1/2)).Nevertheless,excess La_(2)O_(3) is proven to be detrimental as it displays poor mechanical properties due to the poor compactness of numerous LaAl_(11)O_(18) grains,coarsening of Al_(2)O_(3) grains and decline in density.