Athermal electric field effects in flash sintered zirconia

被引：9

作者：

Dong, Jian ^{[1
]}

Biesuz, Mattia ^{[2
]}

Sglavo, Vincenzo M. ^{[1
,2
]}

Kermani, Milad ^{[1
]}

Su, Xiaojia ^{[1
]}

Saunders, Theo ^{[3
]}

Hu, Chunfeng ^{[1
]}

Grasso, Salvatore ^{[1
]}

机构：

[1] Southwest Jiaotong Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Adv Technol Mat, Chengdu 610031, Peoples R China

[2] Univ Trento, Dept Ind Engn, Trento, Italy

[3] Queen Mary Univ London, London, England

来源：

ADVANCES IN APPLIED CERAMICS | 2021年 / 120卷 / 04期

关键词：

flash sintering; athermal electric field effects; 3YSZ; grain growth retardation; defects healing; GRAIN-GROWTH; HEATING RATE; CERAMICS; TEMPERATURE; DENSIFICATION; CONDUCTIVITY; MODEL; CERIA;

D O I：

10.1080/17436753.2021.1919361

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：

We propose an innovative methodology to quantify the dependence of grain growth with respect to current density during flash sintering of zirconia (3YSZ) (field set under a nominal current limit of 150 mA mm(-2). This was achieved by using a notch (0.5 mm deep and 1.5 mm wide) located in the middle of a dog-bone specimen, allowing an uneven current distribution (ranging from 3 to 670 mA mm(-2)) while maintaining a fairly homogeneous temperature (1420-1500 degrees C). Microstructure observations nearby the notch tip confirmed localised overheating. The modelling approach decoupled thermal and electrical field effects identifying the long questioned athermal electric field effects in flash sintering. Increased current density seems to weakly restrain grain growth, to accelerate densification, to promote defects healing (i.e. notch, cracks and pores) and inter-particle bond formation. These results could rationalise the athermal effects occurring during FS and flash joining.

引用

页码：193 / 201

页数：9

共 53 条

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