Processing and properties of pressable ceramic with non-uniform reinforcement for selective-toughening
| Autor: | Xudong Sun, Paul Ichim, Xiaozhi Hu, Wei Yi |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Materials science
Mechanical Engineering Composite number Condensed Matter Physics Brittleness Fracture toughness Flexural strength Mechanics of Materials Residual stress visual_art Ultimate tensile strength visual_art.visual_art_medium General Materials Science Ceramic Composite material Strengthening mechanisms of materials |
| Zdroj: | Materials Science and Engineering: A. 558:543-549 |
| ISSN: | 0921-5093 |
| DOI: | 10.1016/j.msea.2012.08.046 |
| Popis: | Brittle low-strength and low-toughness pressable dental ceramic can be reinforced by ductile elongated gold-particles (GP). A customized crown structure can be adequately strengthened by distributing GP only in critical sections of the crown, where high tensile stresses are experienced. In the present study, a non-uniformly structured ceramic–matrix composite with excellent interfacial bonding, twofold fracture toughness and strength at desired locations, is fabricated using pressable dental ceramic and GP. The layout pattern and sequence of different GP/ceramic powder mixtures, high-temperature flow properties of these mixtures during hot-pressing and the sample mold geometry are used to control the distribution and locations of GP for selective toughening and strengthening. Nano-crystalline structures of the pressable ceramic–matrix and the nano-scaled interfacial region around GP have been revealed by high-magnification field-emission scanning electron microscopy. Toughening and strengthening mechanisms of the elongated GP including residual stresses from composite processing and ductile fracture of GP are discussed together with SEM observations. Bulk flexural strength and local micro-indentation fracture and deformation characteristics of the selective-toughened ceramic/metal composite have been compared to those of the monolithic pressable ceramic to validate the toughening and strengthening mechanisms. |
| Databáze: | OpenAIRE |
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