Tetragonal phase stabilization and densification in AC flash-sintered 1.5 mol% yttria-stabilized zirconia polycrystals with high toughness

被引：11

作者：

Ong, Fei Shen ^{[1
,2
]}

Nambu, Kohta ^{[3
,4
]}

Hosoi, Kohei ^{[1
,5
]}

Kawamura, Kenta ^{[1
,5
]}

Masuda, Hiroshi ^{[2
]}

Feng, Bin ^{[1
,6
]}

Matsui, Koji ^{[1
,5
]}

Ikuhara, Yuichi ^{[1
,6
]}

Yoshida, Hidehiro ^{[1
,2
]}

机构：

[1] Univ Tokyo, Inst Engn Innovat, Next Generat Zirconia Social Cooperat Program, 2-11-16 Yayoi,Bunkyo ku, Tokyo 1138656, Japan

[2] Univ Tokyo, Grad Sch Engn, Dept Mat Sci & Engn, 7-3-1 Hongo,Bunkyo ku, Tokyo 1138656, Japan

[3] Kyushu Univ, Dept Mat Sci & Engn, 744 Motooka,Nishi ku, Fukuoka 8910395, Japan

[4] Natl Inst Mat Sci, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, Japan

[5] Tosoh Corp, Inorgan Mat Res Lab, 4560 Kaisei cho, Shunan, Yamaguchi 7468501, Japan

[6] Univ Tokyo, Inst Engn Innovat, 2-11-16 Yayoi,Bunkyo ku, Tokyo 1138656, Japan

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2024年 / 44卷 / 02期

基金：

日本学术振兴会;

关键词：

Yttria-stabilized zirconia; Flash sintering; Grain size; Toughness; Phase transformation; FRACTURE-TOUGHNESS; MECHANICAL-PROPERTIES; GRAIN-SIZE; TEMPERATURE; TRANSFORMATION; INDENTATION; CERAMICS; ALUMINA; FIELD; MICROSTRUCTURE;

D O I：

10.1016/j.jeurceramsoc.2023.09.010

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

For the first time, isothermal pressureless flash sintering of 1.5 mol% yttria-stabilized zirconia (1.5YSZ) polycrystals designed for high toughness was performed in a 1-kHz alternating current field (120 V & sdot;cm- 1). The parameters governing tetragonal phase stability and densification needed to maximize the toughness of 1.5YSZ were investigated by varying the applied current density limit and holding time. A sample with relative density exceeding 98% and indentation toughness of about 13 MPa & sdot;m0.5 was sintered at 1100 degrees C by applying 40 mA & sdot;mm- 2 to the green body for 2 min, where the average steady-state temperature during flash reached 1330 degrees C. Unlike flash sintering of conventional oxide ceramics, the applied current density and densification were not positively correlated despite pore closure. While Joule heating intensified when applying higher current densities, sample densification was hindered as the accelerated grain growth resulted in intergranular cracks which were generated by spontaneous tetragonal-to-monoclinic martensitic phase transformation during cooling.

引用

页码：1036 / 1043

页数：8