Polysiloxane-derived ceramic foam for the reinforcement of Mg alloy

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autor(en): Greil P, Höppel HW
Zeitschrift: Zeitschrift für Metallkunde
Jahr der Veröffentlichung: 2002
Band: 93
Seitenbereich: 812-818
ISSN: 0044-3093


Abstract

Magnesium/ceramic composites with an interpenetrating microstructure were made by pressure infiltrating an open cellular ceramic preform. The low-density ceramic preform with a porosity of 82% was prepared by foaming a low-viscous polysiloxane/alumina suspension which formed an SiO2/Al2O3 microcomposite ceramic foam after thermal treatment in air at 1200°C. Foaming was achieved by an in situ blowing process during curing of the polysiloxane precursor at 200-300°C. The open cellular structure was characterized by a mean strut thickness of 130 μm, an average cell diameter of 800 μm and a high pore connectivity. The ceramic preforms were infiltrated with AZ 31 magnesium alloy by squeeze casting at 680°C applying a maximum pressure of 86 MPa. Interface bonding was achieved by the formation of spinel and cordierite in a reaction layer at the metal/ceramic interface. The dense metal/ceramic composite possesses significantly higher elastic modulus, yield strength and creep resistance than the monolithic alloy at room temperature and 135°C. The experimental results suggest that filler-loaded preceramic polymers have a high potential for optimization of lightweight metal cast components.


FAU-Autoren / FAU-Herausgeber

Greil, Peter Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Glas und Keramik)
Höppel, Heinz Werner PD Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Zuletzt aktualisiert 2019-18-02 um 15:08