CERAFLEX ultra thin zirconia for fuel cells and electronics

Marketech International Inc.
107B Louisa Street
Port Townsend, WA 98368
Tel: 360-379-6707
Toll Free: 877-452-4910
Fax: 360-379-6907
info@mkt-intl.com


CERAFLEX is a yttria stabilized, ultra thin, tough, flexible zirconia ceramic material in thin sheet form. CERAFLEX is manufactured under carefully controlled conditions using special Doktor blade technology. With this technology sheets as thin as 0.05 mm thick and as large as 200 x 200 mm square can be manufactured. (Larger sizes require thicker material) Standard thickness are 0.100, 0.200 & 0.500 mm thick (.004", .008" & .020"). CERAFLEX is available as either partially or fully stabilized material. For electronic substrates and other mechanical uses requiring high strength and fracture toughness, partially stabilized material containing 3 mole % yttria is recommeded. For use in solid oxide fuel cells, oxygen sensors, and applicaions requiring high oxygen ion conductivity, fully stabilized 8 mole % yttria is used. Both materials are available with fine via holes, grooves and as polished substrates.
Material Features
CERAFLEX 3Y • Highly elastic and flexible ceramic made by forming zirconia into sheets of 0.05 to 1.0 mm in thickness, and having heat, corrosion, and abrasion resistance • High hardness and fracture toughness - three times higher in bending strength, two or three times in fracture toughness than alumina • Good elasticity and high flexibility for materials 0.05 mm thick. Strips are capable of bending to a radius of 8mm
CERAFLEX 8Y • Excellent oxygen ionic conductivity at high temperatures, for uses as solid oxide fuel cell electrolyte and oxygen gas sensor • Offered in large size sheets.

Product Description		8 mole% yttria	3 mole% yttria
Formula		ZrO2 with 8 mole % yttria	ZrO2 with 3 mole % yttria
Standard Thickness		0.100 mm and 0.200 mm (0.004" and 0.008")	0.100 mm and 0.200 mm (0.004" and 0.008")
Size		Strips, sheets and custom shapes up to 200 mm square	Strips, sheets and custom shapes up to 200 mm square (8" x 8")
Material Composition (wt.)		Y2O3 -13.79% Al2O3 - 0.074% SiO2 - 0.032% Fe2O3 - 0.003% MgO - 0.001% Na2O - 0.035%	Y2O3 - 5.35% Al2O3 - 0.043% SiO2 - 0.001% Fe2O3 - 0.004% MgO - 0.001% Na2O - 0.006%
Density		5.85 g/cm³	6.00 g/cm³
Flatness		50 µm/inch	50 µm/inch
Surface Roughness (Ra)		approx. 0.1µm	approx. 0.1µm
Bending Strength (@ 25°C)		40 kgf/mm²	120 kgf/mm²
Coefficient of Thermal Expansion (25-800°C)		9.5 x 10^-6 / °C	9.9 x 10^-6 / °C
Thermal Conductivity (@ 25°C)		6.7 x 10^-3 cal/cm·s· °C	7.6 x 10^-3 cal/cm·s· °C
Resistivity	600°C 700°C 800°C 900°C 1000°C	120 ohm-cm 30 ohm-cm 20 ohm-cm 10 ohm-cm 5 ohm-cm	280 ohm-cm 100 ohm-cm 50 ohm-cm 30 ohm-cm 20 ohm-cm
Applications
8 mole% yttria	SOFC: Thin, fully stabilized zirconia electrolyte for maximum efficiency in planner solid oxide fuel cell assemblies
	Oxygen sensor: Oxygen ion conductor
3 mole% yttria	Substrate: For thick film deposition of HTSC materials
	Thin ceramic: Higher strength and more flexibility than other ceramics of comparable thickness.

CERAFLEX: SC

Zirconia sheets stabilized with scandium. Although more expensive, CERAFLEX:SC has been found to have 3 times the ionic conductivity of yttria stabilized material. This can lower the operating temperature by 200°C without reducing the ionic conductivity performance.

ZIRCONIA GREEN SHEETS (ZGS)

For those who fabricate SOFCs by co-firing zirconia and electrode material together, we have pre-formed thin sheets of "green" zirconia. Zirconia Green Sheets can save money and time. These are unfired thin sheets of zirconia fully stabilized with yttria and are ready for your normal processing. Post firing sizes up to 100 x 100 mm or 200 mm diameter and thicknesses from 0.15 mm to 0.63 mm are available. Fired ZGS are gas tight, have a density of 5.85 g/cm³ and bending strength of > 256 Mpa.