AZS ramming mass is a dry alumina-zirconia-silica mix that is compacted into place with pneumatic rammers to seal joints and form a backing layer where the surrounding brick is AZS. With a ZrO2 content of 30% or more and Al2O3 at 50% or more, it matches the chemistry of fused cast and sintered...
AZS ramming mass is a dry alumina-zirconia-silica mix that is compacted into place with pneumatic rammers to seal joints and form a backing layer where the surrounding brick is AZS. With a ZrO2 content of 30% or more and Al2O3 at 50% or more, it matches the chemistry of fused cast and sintered AZS brick, so the seal moves with the brick instead of cracking away from it.
XZK Group supplies the grade as XZK-RM-AZS. Like all ramming masses it is a dry material placed in thin layers, used for sealing and bedding rather than as a wearing surface.
The mix is a graded combination of corundum and zircon grains with a fines fraction, giving Al2O3 at 50% or more and ZrO2 at 30% or more, with a maximum particle size of 5 mm. It is supplied dry and is compacted dry. The glassy-phase content typical of AZS chemistry helps the layer sinter into a tight, well-bonded mass on heat-up, and it is this sintering as much as the initial compaction that closes the seal in service.
The reason to match AZS brick with an AZS ramming mass is differential movement. A ramming mass in contact with brick must expand and contract at a similar rate, or the joint between them opens as the furnace heats and cools. Because the AZS mass shares the corundum-zircon system of the brick around it, it stays in contact with the brickwork and keeps the joint sealed through thermal cycling. Density is still decisive — the layer is only as impermeable as the compaction that produced it — but chemical compatibility is the additional requirement that sets this grade apart from the zirconite mass.
In service the material reaches a cold crushing strength of 20 MPa or more after drying at 110°C and 40 MPa or more after 1200°C. It is used where the surrounding working layer is AZS and where a slightly more shock-tolerant, lower-density seal is acceptable in place of the very high density of the zirconite grade.
| Technical Properties | XZK-RM-AZS (AZS Mass) | XZK-RM-ZR (Zirconite Mass) |
| ZrO₂ (%) | ≥ 30 | ≥ 63 |
| Al₂O₃ (%) | ≥ 50 | - |
| Bulk Density (g/cm³) | ≥ 2.85 | ≥ 3.3 |
| Compressive Strength (110℃, MPa) | ≥ 20 | ≥20 |
| Compressive Strength (1200℃, MPa) | ≥ 40 | ≥ 50 |
| Max Particle Size (mm) | 5 | 5 |
Test methods follow GB/T and ISO practice; ASTM equivalents and full certificates of analysis are issued with every shipment.
XZK-RM-AZS is the AZS-matching grade, with 30% or more ZrO2, 50% or more Al2O3 and a rammed density of 2.85 g/cm3 or more. Choose it where the working layer is AZS and chemical compatibility with the surrounding brick matters as much as maximum density.
Where the working layer is zircon rather than AZS and the highest possible resistance to metal drilling is needed, the denser zircon ramming mass with 63% ZrO2 and 3.3 g/cm3 is the better choice. Both grades are normally supplied together with sintered AZS bricks and fused cast AZS blocks, and the surrounding system is covered in the monolithic refractory section.
AZS ramming mass is used in the melting basin wherever an AZS working layer has to be sealed:
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.
AZS ramming mass works with fused cast AZS blocks, sintered AZS bricks, zircon ramming mass, zircon bricks and high alumina castable. Browse all refractory products or the AZS range.
Al₂O₃:46%-60%;
Fe₂O₃: 0.7%-1.0%;
Operating Temp:1300-1500℃;
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