Plastic Sintering Behavior of Large-sized La2O3-TiO2-ZrO2 Amorphous Bulk
Wang Zhui1,2; Han Jian-Jun1; Li Jian-Qiang2; Li Xiao-Yu2; Li Jiang-Tao3; He Gang3; Xie Jun1
AbstractLa2O3-TiO2-ZrO2 glass has great potential applications in lens and upconversion host materials for its ultrahigh refractive index. However, due to its low glass forming ability, it can only be prepared by some extremely rapid melt cooling method, which is hard to produce large-sized materials. On the basis of amorphous plastic behavior above the glass transition temperature T-g, large-sized La2O3-TiO2-ZrO2 bulk glasses were obtained by hot pressed sintering within the thermodynamic window Delta T. 30.8% LaO3/2-59.2% TiO2-10% ZrO2 amorphous spheres were firstly prepared by aerodynamic levitation furnace. Whereafter, these spheres were smashed and ground into powders. Then these glass powders were hot pressed into a bulk glass with dimension of phi 20 mmx1 mm. The effects of sintering temperature and pressure on the process of hot pressed sintering were investigated. Microstructures and phase compositions of samples were studied by SEM and XRD. The results show that the samples sintered above 910 degrees C contain a few La4Ti9O24 crystal phases, while the samples sintered below 900 degrees C are totally amorphous. When the sintering temperature is below 900 degrees C, the increase of sintering temperature in a certain range can reduce the number of pores apparently to improve the density of samples. And with the increase of pressure from 20 MPa to 60 MPa, the density of bulk glass prepared by hot pressing at 900 degrees C increases from 4.8797 g/cm(3) to 5.1178 g/cm(3). The large-sized La2O3-TiO2-ZrO2 glass displays excellent optical performance with refractive index of 2.33 at the wavelength of 587.6 nm and the abbe number of 13.2. By analyzing the shrinkage curve of the samples, it is confirmed that the plastic flow is the main mass transfer way during densification process.
Keywordcontainerless method amorphous hot-pressed sintering densification plastic flow
Funding ProjectNational Natural Science Foundation of China[51674232] ; National Natural Science Foundation of China[51471158] ; National Natural Science Foundation of China[51432004]
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Ceramics
Funding OrganizationNational Natural Science Foundation of China
WOS IDWOS:000467574900012
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Document Type期刊论文
Corresponding AuthorWang Zhui
Affiliation1.Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Hubei, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, CAS Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
3.Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100190, Peoples R China
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Wang Zhui,Han Jian-Jun,Li Jian-Qiang,et al. Plastic Sintering Behavior of Large-sized La2O3-TiO2-ZrO2 Amorphous Bulk[J]. JOURNAL OF INORGANIC MATERIALS,2019,34(4):433-438.
APA Wang Zhui.,Han Jian-Jun.,Li Jian-Qiang.,Li Xiao-Yu.,Li Jiang-Tao.,...&Xie Jun.(2019).Plastic Sintering Behavior of Large-sized La2O3-TiO2-ZrO2 Amorphous Bulk.JOURNAL OF INORGANIC MATERIALS,34(4),433-438.
MLA Wang Zhui,et al."Plastic Sintering Behavior of Large-sized La2O3-TiO2-ZrO2 Amorphous Bulk".JOURNAL OF INORGANIC MATERIALS 34.4(2019):433-438.
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