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Strength, fracture toughness, and slow crack growth of zirconia/alumina composites at elevated temperature
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Bansal, Narottam P. Choi, Sung R. |
| Copyright Year | 2003 |
| Description | Various electrolyte materials for solid oxide fuel cells were fabricated by hot pressing 10 mol% yttria-stabilized zirconia (10-YSZ) reinforced with two different forms of alumina particulates and platelets each containing 0 to 30 mol% alumina. Flexure strength and fracture toughness of platelet composites were determined as a function of alumina content at 1000 C in air and compared with those of particulate composites determined previously. In general, elevated-temperature strength and fracture toughness of both composite systems increased with increasing alumina content. For a given alumina content, flexure strength of particulate composites was greater than that of platelet composites at higher alumina contents (greater than or equal to 20 mol%), whereas, fracture toughness was greater in platelet composites than in particulate composites, regardless of alumina content. The results of slow crack growth (SCG) testing, determined at 1000 C via dynamic fatigue testing for three different composites including 0 mol% (10-YSZ matrix), 30 mol % particulate and 30 mol% platelet composites, showed that susceptibility to SCG was greatest with SCG parameter n = 6 to 8 for both 0 and 30 mol% particulate composites and was least with n = 33 for the 30 mol% platelet composite. |
| File Size | 965183 |
| Page Count | 18 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20030032493 |
| Archival Resource Key | ark:/13960/t8rc20v31 |
| Language | English |
| Publisher Date | 2003-02-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Propulsion And Power Solid Oxide Fuel Cells Hot Isostatic Pressing Structural Reliability Mechanical Properties High Temperature Flexing Crack Propagation Fabrication Fatigue Tests Zirconium Oxides Yttria-stabilized Zirconia Electrolytes Fracture Strength Aluminum Oxides Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
