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Mechanical Properties and Microstructures of Al 2 O 3 /TiC/TiB 2 Ceramic Tool Material.
- Source :
- Crystals (2073-4352); Jun2021, Vol. 11 Issue 6, p637-637, 1p
- Publication Year :
- 2021
-
Abstract
- In order to develop a new ceramic tool material with self-repairing capability, Al<subscript>2</subscript>O<subscript>3</subscript>/TiC/TiB<subscript>2</subscript> ceramic tool material was prepared by vacuum hot-pressure sintering method. The toughening and strengthening mechanism of TiB<subscript>2</subscript> on Al<subscript>2</subscript>O<subscript>3</subscript>/TiC substrate was analyzed. The results show that the ceramic tool material has good comprehensive mechanical properties when the TiB<subscript>2</subscript> content is 10 vol.%. Its flexural strength was 701.32 MPa, hardness was 18.3 GPa, and fracture toughness was 6.2 MPa·m<superscript>1/2</superscript>, which were improved by 11.6%, 2.2% and 16.1% respectively, compared with the Al<subscript>2</subscript>O<subscript>3</subscript>/TiC tool material. Fracture surfaces of the Al<subscript>2</subscript>O<subscript>3</subscript>/TiC/TiB<subscript>2</subscript> ceramic tool material were characterized by SEM, EDS and XRD. The results showed that the fracture mode was a mixture of transgranular fracture and intergranular fracture. The growth of Al<subscript>2</subscript>O<subscript>3</subscript> and TiC grains can be effectively inhibited by adding appropriate amount of TiB<subscript>2</subscript>, and the internal grains of the material can be refined. The TiB<subscript>2</subscript> has a uniform distribution in the matrix and acts as a diffusion toughening agent. The cutting performance of Al<subscript>2</subscript>O<subscript>3</subscript>/TiC/10 vol.%TiB<subscript>2</subscript> tool material was further investigated. Experiments conducted on tools made of Al<subscript>2</subscript>O<subscript>3</subscript>/TiC and Al<subscript>2</subscript>O<subscript>3</subscript>/TiC/TiB<subscript>2</subscript> materials showed that the main forms of wear for both tools were abrasive wear and bonded wear. The friction coefficient of Al<subscript>2</subscript>O<subscript>3</subscript>/TiC/TiB<subscript>2</subscript> tools was reduced by 10.77% compared to Al<subscript>2</subscript>O<subscript>3</subscript>/TiC tools. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20734352
- Volume :
- 11
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Crystals (2073-4352)
- Publication Type :
- Academic Journal
- Accession number :
- 151081543
- Full Text :
- https://doi.org/10.3390/cryst11060637