Microstructure of a high strength alumina glass composite

  • The morphology and microstructure of an Al2O3 glass composite (trade name In-Ceram, Vita Zahnfabrik) were studied using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The composite was produced by infiltration of a lanthanum-based glass throughout a porous Al2O3 body. This alumina body was formed by three classes of particles differing in size and shape: faceted particles typically ≤4 μm in diameter, platelets of average diameter 8 μm, 1.5 μm thickness, and small spheres 0.4 μm in diameter. The outstanding strength properties of the composite (600 MPa, ball-on-ring test) are a result of the high wetting capability of the glass phase on the Al2O3 surface. In addition, plastic strain relaxation in the faceted particles by dislocation formation compensates partially for residual stresses and impedes crack formation at the glass/Al2O3 interface.

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Author:Helga Hornberger, Peter M. Marquis, Silke H. Christiansen, Horst P. Strunk
Parent Title (English):Journal of Materials Research
Document Type:Article
Year of first Publication:1996
Release Date:2020/06/26
First Page:855
Last Page:858
Institutes:Fakultät Maschinenbau
Fakultät Maschinenbau / Labor Biomaterialien
Publication:Externe Publikationen
research focus:Produktion und Systeme