Zirconia Ceramics ( ZrO2 )

Sponsored by McDanel Advanced Ceramic Technologies LLCDec 19 2005

Zirconias (ZrO2) are extremely refractory materials. They possess excellent chemical inertness and corrosion resistance at temperatures well above the melting point of alumina. McDanel Advanced Ceramic Technologies LLC zirconias are stabilized in the cubic crystal structure to avoid cracking and mechanical weakening during heating and cooling. In addition to their refractoriness, they offer low thermal conductivity and are electrical conductors above 800°C. They also possess the unique ability to allow oxygen ions to move freely through the crystal structure above 600°C.

Grades and Applications of Z105 Zirconia

Table 1. Grades and typical uses of zirconia.

Grades	Typical Uses
Z105 is a fine grained, high density, cubic crystal, yttria (10.5%) stabilized zirconia. It is an excellent general purpose zirconia. Available by quotation..	Oxygen sensors, thermocouple protection tubes, furnace muffles, liners, crucibles, high temperature heating element support.

Composition of Z105 Zirconia

Table 2. Composition of zirconia Z105.

Zirconia	ZrO₂	88.642%
Yttria	Y₂O₃	10.5%
Silica	SiO₂	0.4%
Alumina	Al₂O₃	0.17%
Titania	TiO₂	0.14%
Calcia	CaO	0.1%
Iron Oxide	FeO₃	0.03%
Magnesia	MgO	0.01%
Sodium Oxide	Na₂O	0.006%
Potassium Oxide	K₂O	0.002%

Physical Propertie s of Z105 Zirconia

Table 3. Physical properties of zirconia Z105.

Bulk Density	Open Porosity	Strength 20°C	Compressive Strength 20°C
5.92g.cm³	0%	276MPa	>1772MPa
370 lb/ft³	0%	40ksi	>250ksi

Thermal Properties of Z105 Zirconia

Table 4. Thermal properties of zirconia Z105.

Conductivity		Expansion Co-Efficient 20-1000°C	Max. Use Temp (no load)
20°C	800°C	Expansion Co-Efficient 20-1000°C	Max. Use Temp (no load)
2W/m.K	2W/m.K	11.3x10^-6/°C	2200°C
14BTU.in/ft².hr.°F	14BTU.in/ft².hr.°F	6.3 x10^-6/°C	4000°F

Tolerances of Z105 Zirconia Components

Table 5. Dimensional tolerances of zirconia Z105 components

Material	To maximum outside diameter of:
	25.4mm (1")	50.8mm (2")
Zirconia	±5% or ±.65mm ±(0.025") min.	±4% or 1.27mm ±(0.050”) min
Various lengths available upon request. Standard length tolerance is 1.575mm (1/16). Standard cambar tolerance is .794mm per 305mm (1 foot). Tighter tolerances and non-catalog tolerances are provided by quotation.

Source: McDanel Advanced Ceramic Technologies

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