Zirconia Ceramics ( ZrO2 )

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 Properties 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

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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