期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 105, 期 3, 页码 1980-1991出版社
WILEY
DOI: 10.1111/jace.18214
关键词
fracture mechanics; toughness; glass; microstructure; silver; silver compounds; spark plasma sintering
资金
- JST PRESTO [JP19206153]
- JSPS KAKENHI [JP21K18837]
The sub-micro silver precipitated in silica glass via spark plasma sintering exhibited improved fracture toughness of the glass and enhanced thermal conductivity.
Sub-micro silver (Ag) precipitated in silica (SiO2) glass was prepared via spark plasma sintering (SPS), and the microstructure, mechanical properties, and thermal conductivity were investigated. The in situ formation of Ag sub-micro particles through decomposition of silver nitrate (AgNO3) was homogeneously distributed within the SiO2 matrix. By precipitation of Ag particles, larger steady-state creep deformation and plastic deformation were observed owing to the ductility of the Ag particles. Moreover, crack bridging and pull-out of Ag particles were observed during crack propagation. As a result, the fracture toughness of SiO2 glass improved with increasing Ag content. The sample with 1.4 vol% Ag sintered at 1200 degrees C showed the highest toughness value of 2.15 +/- 0.2 MPa m(1/2). Larger Ag particles in the samples sintered at higher temperatures tend to deform easily, resulting in larger ductility. In addition, incorporation of Ag particles improved thermal conductivity.
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