Cover Image

Superior Hardness Of Zirconia Toughened Aluminaceramics Through Co-Addition Ofmagnesium Oxide Andlanthanum Oxide

MgO addition into Zirconia toughened Alumina (ZTA) shown a positive impact on Vickers hardness (1710 HV) but only reduced the indentation fracture resistance (KIFR) (3.38 MPa.√m). The low KIFR originated from the formation MgAl2O4 phase in the ZTA /MgO system decreased the KIFR of the ceramics due...

Full description

Saved in:
Bibliographic Details
Main Author: Kong, Chee Xian
Format: Monograph
Language:English
Published: Universiti Sains Malaysia 2018
Subjects:
T Technology
TN Mining Engineering. Metallurgy
Online Access:http://eprints.usm.my/53263/1/Superior%20Hardness%20Of%20Zirconia%20Toughened%20Aluminaceramics%20Through%20Co-Addition%20Ofmagnesium%20Oxide%20Andlanthanum%20Oxide_Kong%20Chee%20Xian_B1_2018.pdf
http://eprints.usm.my/53263/
Tags: Add Tag
No Tags, Be the first to tag this record!
id my.usm.eprints.53263
record_format eprints
spelling my.usm.eprints.53263 http://eprints.usm.my/53263/ Superior Hardness Of Zirconia Toughened Aluminaceramics Through Co-Addition Ofmagnesium Oxide Andlanthanum Oxide Kong, Chee Xian T Technology TN Mining Engineering. Metallurgy MgO addition into Zirconia toughened Alumina (ZTA) shown a positive impact on Vickers hardness (1710 HV) but only reduced the indentation fracture resistance (KIFR) (3.38 MPa.√m). The low KIFR originated from the formation MgAl2O4 phase in the ZTA /MgO system decreased the KIFR of the ceramics due to the low intrinsic indentation fracture resistance of MgAl2O4. To develop a high performance cutting insert, the ceramics must acquire both high hardness and KIFR value. Hence, addition of La2O3 in ZTA seem to be an approach as La2O3 are capable of improving the KIFR of alumina-based ceramics. The mixtures were prepared with addition of La2O3 (0.1 wt.% to 10.0 wt.%) to ZTA/1.0 wt.% MgO. The mixtures were pressed to a rectangular bar at 1600 ºC for 4 hours to observe its effect on microstructure, phases formation, density, porosity and finally measurement of hardness and KIFR. From the hardness and KIFR result obtained, optimization was carried out to tune with the addition of La2O3 content (0.7 wt.% - 1.0 wt.%) for better KIFR with slight reduction of the hardness value. The addition of La2O3 shown a significant effect on the formation of finer Al2O3 grains, creating strong interface between the Al2O3 grains and LaAl11O8 grains result in denser ZTA/MgO ceramics of hardness of 2028 HV. Also, the presence of rod like LaAl11O8 grains in the ZTA/MgO ceramics improved the KIFR up to 6.67 MPa.√m. Universiti Sains Malaysia 2018-06-01 Monograph NonPeerReviewed application/pdf en http://eprints.usm.my/53263/1/Superior%20Hardness%20Of%20Zirconia%20Toughened%20Aluminaceramics%20Through%20Co-Addition%20Ofmagnesium%20Oxide%20Andlanthanum%20Oxide_Kong%20Chee%20Xian_B1_2018.pdf Kong, Chee Xian (2018) Superior Hardness Of Zirconia Toughened Aluminaceramics Through Co-Addition Ofmagnesium Oxide Andlanthanum Oxide. Project Report. Universiti Sains Malaysia, Pusat Pengajian Kejuruteraan Bahan dan Sumber Mineral. (Submitted)
institution Universiti Sains Malaysia
building Hamzah Sendut Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Sains Malaysia
content_source USM Institutional Repository
url_provider http://eprints.usm.my/
language English
topic T Technology
TN Mining Engineering. Metallurgy
spellingShingle T Technology
TN Mining Engineering. Metallurgy
Kong, Chee Xian
Superior Hardness Of Zirconia Toughened Aluminaceramics Through Co-Addition Ofmagnesium Oxide Andlanthanum Oxide
description MgO addition into Zirconia toughened Alumina (ZTA) shown a positive impact on Vickers hardness (1710 HV) but only reduced the indentation fracture resistance (KIFR) (3.38 MPa.√m). The low KIFR originated from the formation MgAl2O4 phase in the ZTA /MgO system decreased the KIFR of the ceramics due to the low intrinsic indentation fracture resistance of MgAl2O4. To develop a high performance cutting insert, the ceramics must acquire both high hardness and KIFR value. Hence, addition of La2O3 in ZTA seem to be an approach as La2O3 are capable of improving the KIFR of alumina-based ceramics. The mixtures were prepared with addition of La2O3 (0.1 wt.% to 10.0 wt.%) to ZTA/1.0 wt.% MgO. The mixtures were pressed to a rectangular bar at 1600 ºC for 4 hours to observe its effect on microstructure, phases formation, density, porosity and finally measurement of hardness and KIFR. From the hardness and KIFR result obtained, optimization was carried out to tune with the addition of La2O3 content (0.7 wt.% - 1.0 wt.%) for better KIFR with slight reduction of the hardness value. The addition of La2O3 shown a significant effect on the formation of finer Al2O3 grains, creating strong interface between the Al2O3 grains and LaAl11O8 grains result in denser ZTA/MgO ceramics of hardness of 2028 HV. Also, the presence of rod like LaAl11O8 grains in the ZTA/MgO ceramics improved the KIFR up to 6.67 MPa.√m.
format Monograph
author Kong, Chee Xian
author_facet Kong, Chee Xian
author_sort Kong, Chee Xian
title Superior Hardness Of Zirconia Toughened Aluminaceramics Through Co-Addition Ofmagnesium Oxide Andlanthanum Oxide
title_short Superior Hardness Of Zirconia Toughened Aluminaceramics Through Co-Addition Ofmagnesium Oxide Andlanthanum Oxide
title_full Superior Hardness Of Zirconia Toughened Aluminaceramics Through Co-Addition Ofmagnesium Oxide Andlanthanum Oxide
title_fullStr Superior Hardness Of Zirconia Toughened Aluminaceramics Through Co-Addition Ofmagnesium Oxide Andlanthanum Oxide
title_full_unstemmed Superior Hardness Of Zirconia Toughened Aluminaceramics Through Co-Addition Ofmagnesium Oxide Andlanthanum Oxide
title_sort superior hardness of zirconia toughened aluminaceramics through co-addition ofmagnesium oxide andlanthanum oxide
publisher Universiti Sains Malaysia
publishDate 2018
url http://eprints.usm.my/53263/1/Superior%20Hardness%20Of%20Zirconia%20Toughened%20Aluminaceramics%20Through%20Co-Addition%20Ofmagnesium%20Oxide%20Andlanthanum%20Oxide_Kong%20Chee%20Xian_B1_2018.pdf
http://eprints.usm.my/53263/
_version_ 1738511180461244416
score 13.211869

Similar Items