Preparation and mechanical properties of SiC whisker and nanosized mullite particulate reinforced TZP composites

Journal Article · Tue Oct 01 00:00:00 EDT 1996 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1996.tb09050.x· OSTI ID:413329

Zhang, Z; Huang, Y; Zheng, L; Jiang, Z ^[1]

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1. Tsinghua Univ., Beijing (China). Dept. of Materials Science and Engineering

The influence of the addition of nanometer mullite particulates and SiC whiskers coated with alumina on the mechanical properties of tetragonal zirconia polycrystals (TZP) was studied. With increasing mullite (p) content the high-temperature flexural strength increased, and a maximum value of 360 MPa at 1,000 C was reached at 15 vol% mullite (p). Furthermore, 10 vol% SiC(w) reinforced 15 vol% mullite/TZP composites improved the high-temperature strength up to 490 MPa at 1,000 C, 2.7 times that of pure TZP matrix. This high-temperature strengthening is attributed to load transfer from TZP matrix to SiC(w) and mullite particulates. Significant whisker pull-out and interface debonding were also observed on the fractured surfaces when Sic(w) was coated with Al{sub 2}O{sub 3} film.

• Sponsoring Organization: USDOE
• OSTI ID: 413329
• Journal Information: Journal of the American Ceramic Society, Vol. 79, Issue 10; Other Information: PBD: Oct 1996
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
HOT PRESSING
MECHANICAL PROPERTIES
ZIRCONIUM OXIDES
YTTRIUM OXIDES
MULLITE
SILICON CARBIDES
ALUMINIUM OXIDES
SAMPLE PREPARATION
POWDERS
CHEMICAL COMPOSITION
CALCINATION
SOLID SOLUTIONS
TEMPERATURE DEPENDENCE
BULK DENSITY
FLEXURAL STRENGTH
FRACTURE PROPERTIES
X-RAY DIFFRACTION
SCANNING ELECTRON MICROSCOPY
TRANSMISSION ELECTRON MICROSCOPY