Abstract
Particulate toughened ceramic-ceramic composites in the MgAl2O4: xTiO2 system were produced with x ranging from 0.0 to 0.5 mole fraction of TiO2. The materials were prepared “by a chemical processing technique to produce controlled microstructures. The starting materials for powder preparation were alkoxides of Mg, Al, and Ti. Mixed alkoxides were pyrolyzed to yield homogeneous and reactive powders. Specimens of various compositions were prepared “by cold pressing and sintering at 1500C for 5 hrs. Specimens of one composition, containing 0.3 mole fraction TiO2, were also prepared “by uniaxial hot pressing at 1500C for 0.5 hr. The hot pressed samples were subsequently aged at 1500C for 1.5, 4.5 and l6 hrs to provide controlled microstructural coarsening. X-ray diffraction analysis indicated the specimens to be magnesium aluminate spinel, with a second phase identified as a magnesium aluminum titanate in the materials doped with TiO2. For the sintered specimens the fracture toughness increased from 1.33 to 3.09 MPa-m1/2, with the addition of 0.5 mole TiO2 (cf. the nominal value of 1.9 for dense polycrystalline spinel). The as-hot pressed specimens showed a fracture toughness of 1.93 MPa-m1/2, which increased to 2.82 MPa-m1/2 with the maximum aging time.
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsPreview
Unable to display preview. Download preview PDF.
References
R. W. Rice, Chemical Technology, [4], p. 230–239, 1983.
R. W. Rice, Ceramic Engineering Science Proceedings, 2, [7–8], pp. 661–701, 1981.
I. W. Donald and P. W. McMillan, Journal of Materials Science, [11], pp. 949–972, 1976.
D. P. H. Hasselman and R. M. Pulrath, pp. 343–378 in Ceramic Microstructures, edited by R. M. Pulrath and J. A. Pask, John Wiley and Sons, New York, 1968.
R. W. Rice, Ceramic Engineering Science Proceedings, 2, [7–8], pp. U93–508, 1981.
J. W. McCauley, Ceramic Engineering Science Proceedings, 2, [7–8], pp. 639–660, 1981.
R. W. Rice, pp. 337–345 in Better Ceramics Through Chemistry, edited by C. J. Brinker, D. E. Clark, and D. R. Ulrich, North -Holland, New York, 1984.
J. J. Lannutti and D. E. Clark, pp. 369–374 in Better Ceramics Through Chemistry, edited by C. J. Brinker, D. E. Clark, and D. R. Ulrich, North -Holland, New York, 1984.
P. F. Becher, J. H. Sommers, B. A. Bender, and B. A. MacFarlane, pp. 79–86 in Processing of Crystalline Ceramics, edited “by H. Palmour, R. F. Davis, and T. M. Hare, Plenum Press, New York, 1978.
P. 247 in Phase Diagrams for Ceramists, edited by E. M. Levin, C. R. Robbins, and H. F. Murdie, The American Ceramic Society, 1964.
O. Yamaguchi, H. Omaki, and K. Shimizu, Journal of Japan Power and Powder Metallurgy, 22, pp. 202–204, 1975.
H. Dislich, Journal of Non -Crystalline Solids, 57, pp. 371–388, 1983.
ASTM Specification C373, in ASTM Standards, Part 13, American Society for Testing and Materials, Philadelphia, 1969.
W. F. Brown and J. É. Srawley, pp. 13–14 in Plane Strain Crack Toughness Testing of High — Strength Metallic Materials, ASTMSTP 410, American Society for Testing and Materials, Philadelphia, 1966.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1986 Plenum Press, New York
About this chapter
Cite this chapter
Homeny, J., Lewis, D., Rice, R.W., Garino, T. (1986). Particulate Toughening in the MgAl2O4-xTiO2 System. In: Bradt, R.C., Evans, A.G., Hasselman, D.P.H., Lange, F.F. (eds) Fracture Mechanics of Ceramics. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-7023-3_9
Download citation
DOI: https://doi.org/10.1007/978-1-4615-7023-3_9
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4615-7025-7
Online ISBN: 978-1-4615-7023-3
eBook Packages: Springer Book Archive