Refractaries

1 Profile:
Zirconia is largely used in refractories industry where it is either used directly as fused cast refractories or manufactured from zirconia powder and sintered or fused to produce a range of refractory shapes such as tundish nozzles, slidegate plates, tubes and rods, For zirconia is excellent in several properties, such as high hardness, strength, fracture toughness, excellent wear and chemical resistance and high refractriness. But because the zirconia-based refractries are relatively expensive, their use is usually limited to those applications where their special properties are most needed. 2 Products:
2.1 Zirconia Material:
The Zirconia Materials include monoclinic zirconia, partially stabilized zirconia and fully stabilized zirconia, the stabilizer include CaO, MgO, Y2O3 and mix of such oxide. The zirconia materials used in refractories are usually fused zirconia, which is easily to come to granule or powder but purity is not very well.
The following table is showing several typical zirconia materials, we also could supply other type of zirconia products according to requirement. Properties Chemical analysis Size
ZC-1 ZC-2 ZC-3 ZM-1 ZY-1 40mesh
ZrO2(¡Ý) 95 93 91 95.5 93.5 60mesh
CaO 3.2~3.8 4.8¡«5.5 7.8¡«8.5 / / 100mesh
Al2O3(¡Ü) 0.6 0.6 0.6 0.6 0.6 200mesh
Fe2O3(¡Ü) 0.1 0.1 0.1 0.1 0.1 325mesh
SiO2(¡Ü) 0.3 0.3 0.3 0.3 0.3 1000mesh
TiO2(¡Ü) 0.2 0.2 0.2 0.2 0.2 Other according to requirement
MgO / 2.2¡«2.8 /
Y2O3 / / 4.8¡«5.5 2.2 Zirconia Tundish Metering Nozzle:
For the matter of perfect in resistance of erosion and thermal shock, they are widely applied in steel casting, and would greatly improve the refractories? lasting time, lower refractories changing times, and advance quality of the metal. 2.3 Zirconia Slidegate Plate:
Zirconia can provide the durability and corrosion resistance that are needed to maximize refractory life for the toughest steel grades.
Properties Slide plate Tundish nozzles
Density(g/cm3) ¡Ý4.9 ¡Ý5.0 ¡Ý4.2 ¡Ý5.2
Porosity(%) ¡Ü16 ¡Ü10 ¡Ü18 ¡Ü8
MOR(Mpa) ¡Ý200 ¡Ý240 ¡Ý150 ¡Ý300
Chemical assurance(%)
ZrO2 ¡Ý94.5 ¡Ý95 ¡Ý80 ¡Ý95
SiO2 ¡Ü0.5 ¡Ü0.5 ¡Ü18 ¡Ü0.5
MgO ¡Ü3 ¡Ü3 ¡Ü0.5 ¡Ü3
Casting time ¡Ý20hours Casting time ¡Ý10hours Casting time ¡Ý40hours 2.4 Zirconia Tube:
For zirconia is low in thermal conductivity and high refractoriness, good oxygen conductivity and electricity conductivity in high temperature, it is extensively used to make into tube in appliance of protecting for heater rod, oxygen sensor and high temperature heater.

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