MgO-Al2O3 Spinel Brick

The MgO-Al₂O₃ Spinel Brick represents an advanced refractory solution that combines the high-temperature stability of magnesia with the chemical resistance of spinel. Cavalry understands that demanding industrial applications require refractories that withstand thermal cycling, chemical attack, and mechanical stress simultaneously. These spinel refractories address these challenges through carefully engineered compositions and precise manufacturing processes.

Spinel formation is a key aspect of these refractories' performance. Magnesium aluminate spinel (MgAl₂O₄) forms through the reaction of magnesia and alumina at high temperatures. This spinel phase provides exceptional resistance to alkali attack, thermal shock, and slag corrosion. The spinel structure reduces the formation of brittle phases that can compromise refractory integrity, resulting in extended service life in aggressive environments. The excellent thermal shock resistance is particularly valuable in applications with frequent temperature fluctuations.

The product range includes three categories of spinel refractories. The MgO-Al₂O₃ spinel bricks (ZSMA-I through ZSMA-IV) feature Al₂O₃ content from 6-12% and MgO content from 83-90%. The ZSMA-III grade incorporates 0.9% ZrO₂ for enhanced thermal shock resistance. The MgO-Fe₂O₃ spinel bricks (ZSMF-I and ZSMF-II) feature Fe₂O₃ content of 3-5% with MgO content of 81-88%, providing enhanced resistance to certain slag compositions. The MgO dolomite bricks (ZSMG-I and ZSMG-II) feature 20-38% CaO content, offering excellent resistance to low-basicity slags.

The physical properties demonstrate the high quality of these refractories. Apparent porosity of 14-17% provides a balance between slag penetration resistance and thermal shock tolerance. Bulk density of 2.92-3.0 g/cm³ ensures dense structures for corrosion protection. Cold crushing strength of 50-60 MPa provides excellent structural integrity. Refractoriness under load of 1680-1700°C demonstrates high-temperature capability. The thermal shock resistance values of 50-120 cycles at 950℃ air demonstrate excellent thermal cycling capability.

Product highlights

Three Product Categories for Comprehensive Coverage
The MgO-Al₂O₃ spinel brick range includes three categories: MgO-Al₂O₃ spinel bricks (four grades), MgO-Fe₂O₃ spinel bricks (two grades), and MgO dolomite bricks (two grades). This comprehensive range allows selection of optimal composition for specific applications, from cement kilns to steel ladles and glass furnaces.

Excellent Thermal Shock Resistance
Thermal shock resistance of 50-120 cycles at 950℃ air demonstrates exceptional thermal cycling capability. The MgO-Fe₂O₃ spinel grades achieve up to 120 cycles for maximum thermal shock performance. The spinel structure reduces the formation of brittle phases that can cause cracking during temperature fluctuations.

Superior Alkali and Slag Resistance
The spinel phase provides excellent resistance to alkali attack and slag corrosion in aggressive environments. The MgO-Fe₂O₃ spinel grades offer enhanced resistance to specific slag compositions. The MgO dolomite grades provide excellent resistance to low-basicity slags.

High Bulk Density for Corrosion Protection
Bulk density ranges from 2.92 to 3.0 g/cm³ across the product range. Higher density grades offer maximum resistance to slag penetration. The dense structure supports extended service life in aggressive applications.

Excellent Cold Crushing Strength
Cold crushing strength of 50-60 MPa ensures excellent structural integrity during installation and service. The high strength provides reliable handling characteristics. The strength supports resistance to mechanical stress during operation.

High Refractoriness Under Load
Refractoriness under load of 1680-1700°C demonstrates high-temperature capability for demanding applications. The thermal stability supports reliable performance at extreme temperatures. The high refractoriness ensures dimensional stability in service.

Controlled Apparent Porosity
Apparent porosity of 14-17% provides a balanced structure for slag penetration resistance and thermal shock tolerance. The porosity control supports predictable performance across different grades.

Specialized Additives for Enhanced Performance
The ZSMA-III grade incorporates 0.9% ZrO₂ for enhanced thermal shock resistance. The ZSMG grades incorporate ZrO₂ for improved performance. These specialized additives provide performance advantages for specific applications.