An efficient Yb2O3 additive for improved densification and corrosion resistance of MgAl2O4 spinel. Issue 3 (1st February 2021)

• Record Type: Journal Article
• Authors: Shan, Ke; Li, Runping; Liu, Jianhua
• Is Part Of: Ceramics international. Volume 47:Issue 3(2021)
• Page Start: 4143
• Page End: 4148
• Publication Date: 2021-02-01
• Subjects: MgAl2O4 -- Yb2O3 -- Densification -- Hardness -- Corrosion resistance; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.09.291
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The effect of Yb2 O3 on the densification and corrosion resistance of MgAl2 O4 spinel was studied. The phase structure, microscopic morphology and indentation diagonal length of the samples were analysed by using an X-ray diffractometer, scanning electron microscope and digital micro-hardness tester. Results showed that the apparent porosity and relative density of the sintered samples with 2 wt% Yb2 O3 are 0% and 99.6%, respectively. The average grain size of MASY2 was the smallest, which was 17.51 μm. The second phase (Al5 Yb3 O12 ) was generated when Yb2 O3 was added to the MgAl2 O4 spinel. Appropriate addition of Yb2 O3 can refine the crystal grains, and Al5 Yb3 O12 was mainly located at the grain boundary, thereby improving the densification of MAS ceramics. In addition, the hardness of the MASY2 sample was the largest, which was 1460 HV. The corrosion depth of the MASY2 sample was the smallest (71.59 μm). The most appropriate amount of Yb2 O3 was 2 wt%.