Obtaining strong zirconia ceramic by hardening and tempering
To determine whether it is possible to strengthen ceramics by means of hardening and tempering, the authors selected a solid solution pf 3.4% of Y/sub 2/O/sub 3/ (molar fraction) in ZrO/sub 2/. The solution was synthesized by combined precipitation of the compounds from an aqueous solution of chlorides. The filtered residue of hydroxides was dried and calcined at about 900/sup 0/C. The calcined material was milled for 80 h in an iron ball mill by the wet method with a ratio of materials: balls: water of 1:2:1. The material was then purified to remove tramp iron by treatment with HC1 with an addition of hydrogen peroxide, followed by decantation with distilled water. The specimens were heated to 2250-2300/sup 0/C in a furnace with a straight-through vertical channel of diameter 20 mm, a heating element made of stabilized zirconia, and high-temperature heat insulation made of porous ceramic-concrete based on ZrO/sub 2/. The hardening of the specimens at this temperature was done at a rate ensuring practically complete preservation of the cubic phase of ZrO/sub 2/. The tempering of the hardened specimens was done by the furnace with a silit heaters at 1400/sup 0/C over different times (0-85 h).
- OSTI ID:
- 6461187
- Journal Information:
- Refractories (Engl. Transl.); (United States), Vol. 25:11; Other Information: Translated from Ogneupory, No. 11, pp. 4-6, November, 1984
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CERAMICS
PRODUCTION
ZIRCONIUM OXIDES
PRECIPITATION HARDENING
TEMPERING
MECHANICAL PROPERTIES
SOLID SOLUTIONS
VERY HIGH TEMPERATURE
CHALCOGENIDES
DISPERSIONS
HARDENING
HEAT TREATMENTS
MIXTURES
OXIDES
OXYGEN COMPOUNDS
SOLUTIONS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication