An advanced self‐lubricating ceramic composite with the addition of core‐shell structured CaF2@Al2O3 powders. Issue 2 (30th September 2018)

• Record Type: Journal Article
• Authors: Chen, Zhaoqiang; Guo, Niansheng; Ji, Lianggang; Guo, Runxin
• Is Part Of: International journal of applied ceramic technology. Volume 16:Issue 2(2019)
• Page Start: 753
• Page End: 760
• Publication Date: 2018-09-30
• Subjects: core ‐ shell cladding structure -- performance test -- self‐lubricating ceramic tool; Ceramics -- Periodicals; Ceramics -- Technological innovations -- Periodicals; 620.1405
• DOI: 10.1111/ijac.13112
• Languages: English
• ISSNs: 1546-542X

Abstract

Abstract: Aiming to improve the performance of self‐lubricating ceramic tools, an advanced self‐lubricating ceramic composite was developed. Core‐shell structure CaF2 @Al2 O3 powders were synthesized by liquid‐phase non‐uniform nucleation method. Al2 O3 /Ti(C, N)/CaF2 @Al2 O3 composite made by adding CaF2 @Al2 O3 powders exhibited notable improvements in microstructure and mechanical properties as compared with Al2 O3 /Ti(C, N)/CaF2 composite made by adding uncoated CaF2 powders. The core‐shell coated self‐lubricating ceramic tool with different content of CaF2 @Al2 O3 was designed and prepared by hot pressing sintering process. The results show that when the content of CaF2 @Al2 O3 is 10 vol%, The composite has the best mechanical properties, the flexural strength, and the fracture toughness and the hardness is 680 MPa, 6.50 MPa·m 1/2, and 17.29 GPa. Compared with the tool material with only CaF2 solid lubricant added, the above performances were increased by 8.91%, 29.48%, and 14.50% respectively. The influence of different CaF2 @Al2 O3 content on the physical and mechanical properties and microstructure of the tool material was analyzed.