NDLI: Microstructural evolution during direct laser sintering in the Al$_{2}$O$_{3}$–SiO$

Content Provider	SpringerLink
Author	Heinrich, Jürgen G. Gahler, André Günster, Jens Schmücker, Martin Zhang, Jingxian Jiang, Dongliang Ruan, Meiling
Copyright Year	2007
Abstract	The microstructural evolution during direct laser sintering of LSD (Layerwise Slurry Deposition)—samples in the Al$_{2}$O$_{3}$–SiO$_{2}$ system has been investigated. Slurries with a water content of 34 wt.% and a SiO$_{2}$/Al$_{2}$O$_{3}$—ratio of about 3:1 have been used to manufacture layers which—after consecutive drying—have been sintered and laminated by laser treatment. Densified samples can be obtained with laser irradiances from 190 to 270 kW/cm$^{2}$ and scan velocities between 35 and 65 mm/s. Elemental mappings of the layers’ cross sections suggest an inhomogeneous phase distribution in the laser sintered LSD samples with a slight alumina concentration gradient. A lower degree of particle melting in the bottom region of the layers is plausible due to attenuation of the laser beam intensity. SEM and HRTEM micrographs show that after a few seconds of laser treatment relictic starting phase, crystalline alumina plus amorphous silica, occur together with needle like mullite, the latter formed within an amorphous aluminosilicate phase. The resulting phase assemblage reflects the non-equilibrium conditions which can be expected for short time laser treatments. Mullite nucleation within the bulk of the liquid phase rather than in the vicinity of the parent alumina phase suggests that dissolution of alumina is the rate controlling step. Subsequent thermal post treatment in air in a conventional sintering furnace causes an increase of density to about 96% and leads to additional phase reactions. Amorphous silica transforms into cristobalite and the amount of alumina is reduced by additional mullite formation. By both coalescence of individual crystals and grain growth the morphology of the newly formed mullite changes during post heat treatment.
Starting Page	5307
Ending Page	5311
Page Count	5
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	42
Issue Number	14
e-ISSN	15734803
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2007-05-23
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Mechanics Crystallography Continuum Mechanics and Mechanics of Materials Polymer Sciences Characterization and Evaluation of Materials Materials Science
Content Type	Text
Resource Type	Article
Subject	Mechanical Engineering Mechanics of Materials Ceramics and Composites Polymers and Plastics

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