Multi-Scale Mechanical Behaviour of a Highly Porous Alumina Based Foam

被引：8

作者：

Buncianu, Dorel ^{[1
,2
]}

Tessier-Doyen, Nicolas ^{[2
]}

Absi, Joseph ^{[2
]}

Negru, Radu ^{[1
]}

Serban, Dan-Andrei ^{[1
]}

Marsavina, Liviu ^{[1
]}

机构：

[1] Univ Politehn din Timisoara, Dept Mech & Strength Mat, Timisoara 300006, Romania

[2] Univ Limoges, UMR CNRS 7315, IRCER, 12 Rue Atlantis, F-87068 Limoges, France

来源：

METALS AND MATERIALS INTERNATIONAL | 2020年 / 26卷 / 10期

关键词：

Ceramic foam; Mechanical properties; Young's modulus; Analytical modeling; THERMAL-CONDUCTIVITY; CERAMIC FOAMS; OPEN-CELL; INDENTATION; STRENGTH; MODULUS;

D O I：

10.1007/s12540-019-00413-0

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This work aims to characterize mechanical properties (strength and fracture toughness) of an alumina-based ceramic foam exhibiting a pore volume fraction around 88% with a multi-scale porosity ranging from 300 to < 2 mu m with a slight interconnectivity of cells. Young's modulus determined by three different methods (resonance, ultrasonic and compression) has been estimated to approximately 4 GPa which is a remarkable value for materials exhibiting such a porous volume. Moreover, regarding solid material, a value of 380 GPa taking into account the imperfect purity of alumina and the effect of grain boundaries has been determined by indentation at nano-scale. Values predicted by Ashby-Gibson and Pabst analytical models provide reliable results concerning the significant interconnectivity of porous cells in the microstructure. Finally, compressive, bending strengths and fracture toughness are respectively close to 2 MPa, 1 MPa and 0.1 MPa m(1/2). These values are in agreement with the results obtained by some authors for alumino-silicate based foams exhibiting close compositions.

引用

页码：1524 / 1532

页数：9

共 36 条

[21] THE MICROHARDNESS INDENTATION LOAD SIZE EFFECT IN RUTILE AND CASSITERITE SINGLE-CRYSTALS [J].