MgO-ZrO2 brick

The MgO-ZrO₂ Brick represents a premium refractory solution that combines the high-temperature stability of magnesia with the exceptional chemical resistance of zirconia. Cavalry understands that demanding industrial applications require refractories that withstand severe alkali attack, thermal cycling, and slag corrosion simultaneously. These magnesia-zirconia refractories address these challenges through carefully engineered compositions and precise manufacturing processes.

The MgO-ZrO₂ system provides outstanding resistance to alkali attack, particularly in cement kiln applications where alkalis are present. The zirconia (ZrO₂) component provides exceptional chemical stability and resistance to penetration by basic slags and alkali compounds. Zirconia also contributes to improved thermal shock resistance through its phase transformation toughening mechanism, which absorbs crack energy and reduces crack propagation. The high magnesia content provides excellent resistance to basic slag attack, while the zirconia enhances resistance to alkali penetration.

The two available grades provide options for different operational requirements. The ZMZr-A grade with 13.5% ZrO₂ and 78% MgO offers maximum zirconia content for the most aggressive alkali environments. The ZMZr-B grade with 12% ZrO₂ and 74% MgO provides a more economical option for less demanding applications. Both grades maintain tight control on impurities, with SiO₂ ≤1.5-2%, CaO ≤1-1.5%, and Fe₂O₃ ≤0.8-1%.

The physical properties demonstrate the exceptional quality of these refractories. Apparent porosity of 13-16% provides a dense structure that resists slag and alkali penetration. Bulk density of 3.1-3.2 g/cm³ ensures dense structures for corrosion protection. Cold crushing strength of 60-100 MPa provides exceptional structural integrity, among the highest in the refractory industry. The refractoriness under load of 1580-1680°C demonstrates high-temperature capability. The thermal shock resistance of 10 cycles at 950°C air cooling demonstrates good thermal cycling capability.

Product highlights

Two Grade Options for Application Flexibility
The MgO-ZrO₂ brick range includes two grades: ZMZr-A with 13.5% ZrO₂ and ZMZr-B with 12% ZrO₂. This range allows selection of optimal zirconia content for specific applications, from cement kilns to steelmaking and glass furnaces.

Exceptional Alkali Resistance
The zirconia component provides outstanding resistance to alkali attack, particularly in cement kiln applications. The zirconia resists penetration by alkali compounds and basic slags. This exceptional resistance extends service life in the most aggressive alkali environments.

Zirconia Toughening for Thermal Shock Resistance
The zirconia component provides phase transformation toughening that absorbs crack energy and reduces crack propagation. This toughening mechanism improves thermal shock resistance. The thermal shock resistance of 10 cycles at 950°C demonstrates reliable thermal cycling capability.

Very High Bulk Density for Corrosion Protection
Bulk density of 3.1-3.2 g/cm³ provides exceptionally dense structures for corrosion protection. The dense structure reduces slag and alkali penetration significantly. The high density provides maximum protection in aggressive applications.

Excellent Cold Crushing Strength
Cold crushing strength of 60-100 MPa provides exceptional structural integrity, among the highest in the refractory industry. The ZMZr-A grade achieves 100 MPa for maximum mechanical strength. The high strength provides reliable handling characteristics and installation performance.

High Refractoriness Under Load
Refractoriness under load of 1580-1680°C demonstrates the high-temperature capability of these refractories. The ZMZr-A grade achieves 1680°C for maximum thermal stability. The high refractoriness ensures dimensional stability at extreme temperatures.

Low Apparent Porosity
Apparent porosity of 13-16% provides a dense structure that resists slag and alkali penetration effectively. The ZMZr-A grade achieves 13% porosity for maximum corrosion protection. The low porosity significantly reduces pathways for corrosive penetration.

Tight Impurity Control
Impurities are tightly controlled with SiO₂ ≤1.5-2%, CaO ≤1-1.5%, and Fe₂O₃ ≤0.8-1%. The low impurities ensure high purity and consistent refractory performance. The high purity contributes to improved slag resistance and extended service life.

Proven Performance in Cement Kilns
MgO-ZrO₂ bricks have demonstrated reliable performance in cement rotary kilns where alkali attack is severe. The proven track record provides confidence in performance and service life.