Pressureless infiltrated alumina and zirconia based steel - MMCs

Alumina and zirconia based steel-MMCs were produced by pressureless Ti-activated melt infiltration using a high vacuum furnace. The effect of particle size and morphology on the formation of a ceramic network in-situ and MMC properties were investigated using three different alumina powders. The alumina/steel-MMCs were characterised for microstructure, Young’s modulus and strength at room temperature and elevated temperatures, and wear behaviour. Also the use of different types of steel was shown. Zirconia/steel-MMCs were produced using three different types of zirconia powder. With the use of monoclinic and partially stabilised (Ca-PSZ, Mg-PSZ) zirconia powder the effect of the monoclinic to tetragonal phase transformation on MMC microstructure and wear behaviour was shown. Further alumina preforms were successfully infiltrated in argon atmosphere at atmospheric pressure using a standard tube furnace. The infiltration in argon resulted in an increased degradation of the alumina particles. The infiltrations showed further investigations are needed for a better understanding of the mechanism of activated melt infiltration since different reactions (i.e. ceramic/metal interactions, dissolutions and evaporations) occur simultaneously during infiltration.

Level thesis:degree_level

thesis.doctoral

Grantor dc:publisher

TU Bergakademie Freiberg

Year

2008

Author dc:creator

• Wittig, Daniela

Contributors dc:contributor

• Aneziris, Christos G.
• Kübler, Jakob
• Biermann, Horst
• Graule, Thomas

• Verbundwerkstoff
• Infiltration
• Eigenschaften
• Stahl
• Aluminiumoxide
• Stoffeigenschaft
• Zirkoniumdioxid