Realizing near-full density monophasic tetragonal 1.5-mol% yttria-stabilized zirconia ceramics via current-ramp flash sintering

被引：2

作者：

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

Nambu, Kohta ^{[3
,4
]}

Kawamura, Kenta ^{[1
,5
]}

Hosoi, Kohei ^{[1
,5
]}

Masuda, Hiroshi ^{[2
]}

Feng, Bin ^{[1
,6
]}

Matsui, Koji ^{[1
,6
]}

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, 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, Sch Engn, Dept Strateg Studies, 2-11-16 Yayoi,Bunkyo Ku, Tokyo 1138656, Japan

来源：

ACTA MATERIALIA | 2025年 / 283卷

基金：

日本学术振兴会;

关键词：

Yttria-stabilized zirconia; Flash sintering; Phase transformation; Toughness; Low-temperature degradation; MICROSTRUCTURE-DEVELOPMENT MECHANISM; GRAIN-SIZE DISTRIBUTION; FRACTURE-TOUGHNESS; ELECTRIC-FIELD; TRANSFORMATION; TEMPERATURE; DEGRADATION; BEHAVIOR; GROWTH; PHASE;

D O I：

10.1016/j.actamat.2024.120496

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This study demonstrates the successful fabrication of near-full density monophasic tetragonal 1.5-mol% yttriastabilized zirconia (1.5YSZ) ceramics using current-ramp flash (CRF) sintering technique. The process involved regulating Joule heating in the samples by fine-tuning the input power through an alternating current field (nominal current density: 50 mA center dot mm(-2)) within a 3-min timeframe at a furnace temperature of 1100 degrees C. This approach effectively enhanced grain size uniformity, which is crucial for preventing sample cracking associated with spontaneous tetragonal-to-monoclinic (T -> M) phase transformation, thereby promoting densification with average relative densities exceeding 99%. The highest average fracture toughness of the 1.5YSZ samples was measured at 9.2 MPa center dot m(0.5) using the standardized single-edge pre-cracked beam method. This toughness is approximately double that of commonly used 3YSZ samples produced by CRF sintering, all of which exhibited comparable average grain sizes and relative densities. Additionally, the 1.5YSZ samples demonstrated nearly identical resistance to low-temperature degradation (LTD) compared to the 3YSZ samples after accelerated hydrothermal aging at 140 degrees C for 15 h, roughly equivalent to 60 years at 37 degrees C. The reduced yttria concentration in 1.5YSZ facilitates T -> M phase transformation at lower stress thresholds, enhancing toughness through increased crack shielding from a larger volume fraction of transformed grains. Furthermore, the uniform yttria distribution in 1.5YSZ, revealed by scanning transmission electron microscopy, compensates for the reduced tetragonal phase stability and contributes to improved LTD resistance. Notably, these exceptional properties were achieved at a furnace temperature 300 degrees C lower and with a sintering duration several hours shorter than those of conventionally-sintered counterparts.

引用

页数：12

共 68 条

[1] Toughness tailoring of yttria-doped zirconia ceramics [J].