Nano-size SiC particle-reinforced hydroxyapatite composites
- Tsinghua Univ., Beijing (China); and others
This paper describes the sintering behavior of hydroxyapatite (HA) with dispersed nano-size SiC particles for various compositions and its mechanical properties. The effects of MgO, ZnO, Al{sub 2}O{sub 3}, and La{sub 2}O{sub 3} particle additives on the microstructure and mechanical characteristics of HA/SiC nanocomposites were studied. The toughening mechanisms and strengthening mechanisms of various nanocomposites were discussed. The HA with 5wt% MgO and 5wt% SiC{sub (n)} additives possesses a higher strength. Its facture toughness (K{sub IC}), flexural strength and compressive strength were 2.11 MPa{center_dot}m{sup 1/2}, 110 MPa and 718 MPa, respectively, which were 1.9, 1.6, and 1.4 times as large as those of the pure HA ceramics. The micromorphologies showed that finer SiC particles were predominantly dispersed within the HA matrix grains. The roles of the nano-size dispersoids were investigated. The La{sub 2}O{sub 3} additives were found to inhibit the decomposition of HA at higher temperatures. The mechanical properties were also improved in the HA-ZnO{sub (n)}-SiC{sub (n)} nanocomposite system.
- OSTI ID:
- 258953
- Report Number(s):
- CONF-9505249--
- Country of Publication:
- United States
- Language:
- English
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