Viscous flow flash sintering of porous silica glass

被引：40

作者：

Oscar Prado, Miguel ^{[1
,2
]}

Biesuz, Mattia ^{[3
,4
]}

Frasnelli, Matteo ^{[3
]}

Emmanuel Benedetto, Franco ^{[1
]}

Sglavo, Vincenzo M. ^{[3
,4
]}

机构：

[1] Comis Nacl Energia Atom, Ctr Atom Bariloche, Dept Mat Nucl, Km 9-5Av E Bustillo, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[2] Consejo Nacl Invest Cient & Tecn, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[3] Univ Trento, Dept Ind Engn, Via Sommarive 9, I-38123 Trento, Italy

[4] INSTM Res Unit, Via G Giusti 9, I-50121 Florence, Italy

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 2017年 / 476卷

关键词：

Sintering; Silicate glass; Flash sintering; Electric field induced softening; Powder; Consolidation; THERMAL RUNAWAY; ZIRCONIA; ALUMINA; MICROSTRUCTURE; PHOTOEMISSION; CONDUCTIVITY; FSPS;

D O I：

10.1016/j.jnoncrysol.2017.09.024

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 compacts of porous glass particles (95 wt% SiO2, 2.3% Na2O, 1.6% Al2O3) exhibiting macro-, meso- and micro-pores were densified by flash sintering, using DC electric field in the range 1000-3000 V cm(-1). The results point out the applicability of this sintering technology to glasses characterized by viscous flow sintering mechanisms. Excluding the anodic region, the specimens resulted well densified using a current limit of 2 mA mm(-2) and a dwelling time of 30 s. The obtained microstructure at the anode and at the cathode side is asymmetric, the former being characterized by the formation of Na-enriched region, the latter by the local formation of large pores (hundreds of microns). The mechanism, which triggers the flash event, appears to be associated to dielectric breakdown.

引用

页码：60 / 66

页数：7