High Temperature Zirconia Bulk Fibres 2,200°C

Zirconia Bulk Fibre, up to 2,200 °C

Bulk Fibers Type ZYBF are available in three different forms, all having useful properties up to 2,200 °C. These polycrystalline fibers can be vacuum formed into rigid shapes, placed into cavities as loose fill insulation, or added to ceramic bodies and coatings for reinforcement.

Manufacturing of Zirconium Oxide Bulk Fibre

All three ZYBF types are made using the original Zircar Process by Zircar Zirconia. This process uses microphagia to transforms an organic fibre into a ceramic fibre. 

ZYBF is 6 to 10 microns in diameter, is nearly 100% zirconia phase stabilized with 10 % yttria. The yttria stabilizes the tetragonal / cubic structure by preventing the monoclinic to tetragonal crystal transformation that occurs at 1,170 °C in pure un-stabilized or insufficiently stabilized zirconia. This undesirable transformation causes an 11 % volume change in the crystal unit cell size that can cause micro-cracking and reduced physical strength in the bulk solid. 

Yttria stabilized zirconia is an electrical semiconductor at elevated temperatures. This conductivity arises from the different valences of ionic Zr4+ and Y3+. Electricity is conducted at elevated temperatures (700 to 800 °C) as oxygen ions are induced to flow through the stabilized zirconia structure. This phenomenon forms the basis of zirconia oxygen sensors.

Applications of Zirconium Oxide Bulk Fibre

• Can be use to forming rigid shapes
• Can stabilize ceramic fibre products that have been formed in vacuum atmosphere
• Can be added to Zirconia Cement Type ZR-CEM and used as a coating or as a filler for holes, bonding of matched surfaces, and repairing cracks and openings in furnace walls composed of zirconia insulation
• Can be placed into cavities as loose fill insulation or used as furnace packing
• Can be used as thermal insulation in industrial furnaces
   

General Characteristics of Zirconium Oxide Bulk Fibre

1 Based on Pore Volume 2 Based on Surface Area

* 1 – 2 wt% hafnia occurs naturally with zirconia and does not affect performance.

Benefits of Zirconium Oxide Bulk Fibre

• Low thermal conductivity
• Temperature rating to as high as 2,200 °C
• Phase stabilized with 10 wt. % yttria
• High purity
• 100 % inorganic, no off-gassing or odors
• Excellent in corrosive, oxidizing and reducing atmospheres
• Extremely low silica content
• Non-rcf, asbestos free
• Usable in multiple atmospheres

Zirconium Oxide Bulk Fibre Product range

Fibre Typ ZYBF-1

ZYBF-1 are serrated externally and hollow internally resulting in the lowest bulk density and lowest thermal conductivity. The fibres are greyish in color and have a high specific surface value (75 m2/g BET). From the three ZYBF fibres, ZYBF-1 is the one with the longest filaments: some are as long as 1 cm.

Fibre Typ ZYBF-2

ZYBF-2 exhibits the common serrated outer diameter with some internal porosity resulting from additional heat treatment. The fibres are white in color.

Fibre Typ ZYBF-5

ZYBF-5 is the most heat treated and therefore the most solid of the fiber types with the added benefit of very little agglomeration. ZYBF-5 grain’s size approaches a micron and are white in color.

Availability of Zirconium Oxide Bulk Fibre

Physical variables included in this documentation are provided by way of indication only and do not, under any circumstances, constitute a contractual undertaking. Please contact our technical service if you require any additional information.