Fused cast AZS bricks are the standard glass-contact refractory for the melting tank. The material is melted in an electric arc furnace at around 2000°C and poured into moulds, so the finished block is a dense, interlocked corundum-zirconia structure with a cold crushing strength of 300 MPa or...
Fused cast AZS bricks are the standard glass-contact refractory for the melting tank. The material is melted in an electric arc furnace at around 2000°C and poured into moulds, so the finished block is a dense, interlocked corundum-zirconia structure with a cold crushing strength of 300 MPa or more. XZK supplies three grades — 33#, 36# and 41# — which differ in zirconia content, density and the behaviour of the glassy phase.
The three grades are not quality levels of the same product; they are engineered for different positions and different dominant wear mechanisms in the tank, and the number in each name states the nominal zirconia content.
The melt-and-cast route is what gives fused AZS its properties. Alumina and zirconia crystallise together as the block cools, forming an interlocked structure with a dense-part bulk density from 3.75 to 3.95 g/cm3 and a cold crushing strength of at least 300 MPa. What remains between the crystals is a small proportion of glassy phase, measured as glass phase exudation at 1500°C for 16 h and held between 2.0% and 3.0%. Casting method controls how that phase and any shrinkage cavity are distributed: the data table therefore lists density separately for the PT/QX, MS/ZWS and WS casting categories, because the same chemistry poured by different methods gives different soundness at the working face.
The grade number states the zirconia content. XZK-FAZS33 carries at least 32.5% ZrO2, FAZS36 at least 36% and FAZS41 at least 41%. Zirconia is the phase that resists dissolution by the glass melt, so corrosion resistance rises with the number, and so does dense-part bulk density, from 3.75 to 3.95 g/cm3. At the same time the silica content falls from 14.0% to 13.0% and the soda content from 1.5% to 1.3%, both of which reduce the proportion of glassy phase and its tendency to exude.
Grade selection follows the mechanism that destroys the block at a given position. FAZS33 has the highest silica and the largest glassy fraction, which gives it the best tolerance of thermal shock; it suits blocks that see repeated heating and cooling and reversal cycling. FAZS41 is the most corrosion resistant and among the least exudable, and is used where melt flow and chemical attack are most severe. FAZS36 sits between the two and is the general-purpose grade for sidewalls, paving and superstructure. Refractoriness under load is at least 1700°C (T0.5) in all three grades, so the choice is never about heat resistance — only about which attack the block will face.
| Technical Properties | XZK-FAZS33 | XZK-FAZS36 | XZK-FAZS41 |
| Al₂O₃ (%) | ≥ 50.0 | ≥ 48.0 | ≥ 45.0 |
| ZrO₂ (%) | ≥ 32.5 | ≥ 36.0 | ≥ 41.0 |
| SiO₂ (%) | ≤ 14.0 | ≤ 14 | ≤ 13.0 |
| Na₂O (%) | ≤ 1.5 | ≤ 1.4 | ≤ 1.3 |
| Bulk Density (g/cm³) | ≥3.75 | ≥3.80 | ≥3.95 |
| Bulk Density (PT/QX, g/cm²) | 3.4 | / | / |
| Bulk Density (MS/ZWS, g/cm²) | 3.6 | 3.7 | 3.85 |
| Bulk Density (WS, g/cm²) | 3.7 | 3.75 | 3.9 |
| Cold Crushing Strength (MPa) | ≥300 | ≥300 | ≥300 |
| Refractoriness Under Load T0.5 (℃) | ≥1700 | ≥1700 | ≥1700 |
| Glass Phase Exudation (%) 1500℃×16h | ≤ 2.0 | ≤3.0 | ≤2.5 |
Test methods follow GB/T and ISO practice; ASTM equivalents and full certificates of analysis are issued with every shipment.
Zirconia content is the single variable that governs service life at a given position, so grade selection is normally read directly from a zoning drawing rather than chosen per furnace.
Glass Industry (Primary Application): The dominant use, essential for glass melting furnaces.
Non-Ferrous Metallurgy:
Iron and Steel Industry (Specific Applications):
Waste Incineration & Melting:
Chemical & Ceramic Industries:
Fused cast AZS occupies the melt-contact positions of the tank, where the combination of high temperature, melt flow and chemical attack is most severe. Grade choice changes with the position rather than with the furnace.
Manufacturing is controlled from raw material through to finished brick. Four automatic batching lines feed 20 CNC presses ranging from 630 to 2000 tonnes, so density is set by press force rather than operator judgement, and firing runs through four 108-metre fully automatic tunnel kilns and five ultra-high-temperature shuttle kilns for a uniform soak.
Every batch is tested for bulk density, apparent porosity, cold crushing strength and refractoriness under load, and ships with a certificate of analysis. XZK Group holds ISO 9001, ISO 14001, ISO 45001 and ISO 50001 certification and operates the Henan Provincial Engineering Technology Research Center for Sintered Refractories for Glass Furnaces.
Fused cast AZS is the melt-contact layer of a complete melting basin system, working with sintered AZS bricks in the doghouse and superstructure, zircon bricks and zircon ramming mass in the sub-layer and bottom, AZS ramming mass at the paving joints and high-alumina insulating bricks beneath the tank. See the AZS bricks range for zoning guidance or browse all refractory products.
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