CERAMIC PROPERTIES OF THE SYSTEM ZrO$sub 2$-SiO$sub 2$ (in Czech)
Sintered ZrO/sub 2/ with small additions (5 to 10%) of SiO/sub 2/, in general have better thermal shock resistance than sintered zirconia stabilized with CaO or MgO. The favorable effect of SiO/sub 2/ on properties of sintered ZrO/sub 2/ is largely due to inhibition of grain growth processes caused by solid phase reactions of both substrates. Decisive improvement of high temperature mechanical properties is obtained at 10% SiO/sub 2/ content which provides continuous distribution of ZrO/sub 2/ . SiO/sub 2/ phase in the sintered material. Owing to absence of cracking, in the presence of 10% additions of SiO/ sub 2/ (even with comparatively low porosity of 10%) there is no hysteresis loop during heating and cooling of the sintered material and therefore there are no irreversible dimensional changes after firing or repeated fatigue cycles. Owing to unfavorable effect of SiO/sub 2/u additions on sintering of ZrO/sub 2/ it is recommended to use the latter in the form of a powder obtained by igniting ZrOCl/ sub 2/ at 700 to 800 deg C in the presence of SiO/sub 2/- In these conditions transient stabilization of the lowtemperature reactive tetragonal form of ZrO/sub 2/ gives a reactive raw powder and, after sufficiently longer holding at the sintering temperature, a reasonably high density of the sintered material. (auth)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-16-024210
- OSTI ID:
- 4829359
- Journal Information:
- Prace Inst. Hutniczych, Journal Name: Prace Inst. Hutniczych Vol. Vol: 5
- Country of Publication:
- Country unknown/Code not available
- Language:
- Czech
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THE SYSTEM CaO-MgO-ZrO$sub 2$-SiO$sub 2$
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Related Subjects
CERAMICS
CONFIGURATION
COOLING
CRACKS
DENSITY
DISTRIBUTION
ENRICHMENT
FATIGUE
FREQUENCY
GRAIN SIZE
HEATING
HIGH TEMPERATURE
HYSTERESIS
IMPREGNATION
LOW TEMPERATURE
MAGNESIUM OXIDES
MECHANICAL PROPERTIES
METALS, CERAMICS, AND OTHER MATERIALS
PHASE DIAGRAMS
POROSITY
POWDERS
REACTION KINETICS
SILICON OXIDES
SINTERING
SOLIDS
STABILITY
THERMAL STRESSES
TRANSIENTS
ZIRCONIUM CHLORIDES
ZIRCONIUM OXIDES