Zirconia Fibre Felts 2500°C
Zirconia felt Types ZYF are composed of 100%, 4-6 micron diameter, yttria-stabilized zirconia fibres which are mechanically interlocked. These zirconia felts are 100% inorganic fibres and contain no binders. They undergo no phase transitions on temperature cycling and are very effective thermal insulators, capable of use at temperatures up to 2000°C.
They are designed for use in extremely corrosive environments and high temperatures. These materials are equally useful in strong oxidizing and reducing environments. They are not reactive to alkali vapours, salts or strong hot solutions. The felts are not wet by most molten metals. They are easily cut to size.
Main properties of Zirconia Fibre Felts
- Low thermal conductivity
- High porosity
- High purity
- Extreme high temperature stability
Available thicknesses
- 1.27mm – 0.05 inch
- 2.54mm – 0.10 inch
- 3.81mm – 0.15 inch
- 4.06mm – 0.16 inch
Applications of Zirconia Fibre Felts
- Thermal insulation in crystal growing applications
- Electrolytic cell separator
- Setter material
- Diffusion burner membrane
Technical data
|
Properties |
ZYF-50 |
ZYF-100 |
ZYF-150 |
ZYF-A2.13 |
ZYF-S.75G |
|
Thickness, inch mm |
0.05 + 0.015 1.27 + 0.4 |
0.10 + 0.03 2.54 + 0.76 |
0.15 + 0.03 3.81 + 0.76 |
0.160 + 0.035 4.06 + 0.89 |
0.10 + 0.03 2.54 + 0.76 |
|
Bulk Porosity |
96 % |
95 % |
94 % |
94 % |
88 % |
|
Bulk Density lb/ft3 g/cm3 |
15 0.24 |
15 0.24 |
20 0.32 |
20 0.32 |
30 0.48 |
|
Tensile strength lb/inch width g/cm |
0.6 107 |
1.6 286 |
2.0 357 |
7.0 1250 |
1.7 304 |
|
Weight / Area lb / ft² g/m² |
0.07 342 |
0.13 635 |
0.23 1123 |
0.21 1025 |
0.22 1074 |
|
Melting Point °F °C |
4700 2593 |
4700 2593 |
4700 2593 |
|
|
|
Compressive Strength psi @ 10% Compression |
3 |
3 |
5 |
13 |
13 |
|
Composition |
|
|
|
|
|
|
Wt% ZrO2*+Y2O3 |
99+ |
99+ |
99+ |
97+ |
56+ |
|
Wt% Al2O3 |
<0.01 |
<0.01 |
<0.01 |
2+/-1 |
<0/01 |
|
Wt% SiO2 |
<0.02 |
<0.02 |
<0.02 |
<0.02 |
43 |
|
Minimum wrapping diameter before breaking |
0.25 inch 6.35 mm |
0.75 inch 19.05 mm |
3 inches 76.20 mm |
3 feet 914.40 mm |
2 inches 50.80 mm |
|
Specific Heat BTU / lb°F J/KgK |
|
|
|
|
|
|
@ 200°F 93°C |
0.13 544 |
0.13 544 |
0.13 544 |
|
|
|
@ 4300°F 2371°C |
0.18 754 |
0.18 754 |
0.18 754 |
|
|
|
Vapour Pressure @ 2500°F (1371°C) |
8 x 10-12 Torr |
8 x 10-12 Torr |
8 x 10-12 Torr |
|
|
|
%Shrinkage after 1 hr.@ 3000°F (1649°C) isothermal soak |
5 |
4 |
4 |
1.5 |
5 |
*1 - 2 wt% hafnia occurs naturally with zirconia and does not affect performance.