ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The sintering, microstructure and toughness of mullite/ZrO2 composites with increasing amount of ZrO2 (0 to 20 vol %) have been studied. A very active premullite powder has been used as matrix. TheK IC values increase from 2.1 to 3.2 MN m−3/2 as the volume fraction of zirconia increases from 0 to 0.2. The realtive fraction of tetragonal zirconia decreases as the volume fraction of ZrO2 increases to reach ∼0.1 in the sample with 0.2 volume fraction of ZrO2. The presence of ZrO2 enhances the sintering rate and end-point density of the composites. Finally, the increasing toughness in mullite/ZrO2 composites has been explained by a grain boundary strengthening mechanism produced by a metastable solid solution (∼0.5 wt %) of ZrO2 in mullite.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01026966
Permalink