Role of cold isostatic pressing in the formation of the properties of ZrO{sub 2}-base ceramics obtained from ultradisperse powders
- Donetsk Physicotechnical Institute (Ukraine); and others
The physicomechanical properties of ceramics obtained from plasmachemical and sol-gel powders of partially stabilized (3% Y{sub 2}O{sub 3}) zirconia (PSZ) and its compositions with 20% Al{sub 2}O{sub 3} by cold isostatic pressing (CIP) at a pressure of at most 2 GPa and sintering at 1300-1650{degrees}C are investigated. It is established that plasmachemical PSZ exhibits its best properties (K{sub 1c} = 7.8 MPa {center_dot} m{sup 1/2}, a strength of 650 MPa) only after complete disintegration at a CIP of 0.1 GPa and a sintering temperature of 1650{degrees}C, when the material is sintered to a density of 5.5 g/cm{sup 3}. After partial stabilization and CIP at 0.1 GPa the plasmachemical composition of PSZ + 20% Al{sub 2}O{sub 3} is sintered at 1650{degrees}C to a density of 4.7 g/cm{sup 3}, but has K{sub 1c} = 8.5 MPa {center_dot} m{sup 1/2} and a strength of 700 MPa. The deagglomerated sol-gel powder exhibits properties at a level of K{sub 1c} = 12.4 MPa {center_dot} m{sup 1/2} and a strength of 950 MPa at a density above 6.0 g/cm{sup 3} after CIP at 0.3 GPa and sintering at 1450{degrees}C. The latter obviously has the best mechanical properties of all the investigated materials.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 160369
- Journal Information:
- Refractories, Journal Name: Refractories Journal Issue: 1-2 Vol. 36; ISSN REFRAL; ISSN 0034-3102
- Country of Publication:
- United States
- Language:
- English
Similar Records
Mullite matrix continuous fibre reinforced composites by sol-gel processing
Sol-gel microsphere pelletization process for fabrication of high-density ThO/sub 2/-2% UO/sub 2/ fuel for advanced pressurized heavy water reactors