Corundum Mullite Saggar for High-Temperature Kiln Firing Applications
Corundum mullite saggar is a critical type of kiln furniture used to hold, protect, and position ceramic products during high-temperature firing processes. It is widely applied in industries where dimensional stability, thermal reliability, and long service life are essential, including electronic ceramics, lithium battery materials, technical ceramics, and advanced refractory production.
Compared with conventional mullite or cordierite kiln furniture, corundum mullite refractory saggar offers significantly improved mechanical strength, creep resistance, and chemical stability, allowing it to operate reliably in firing temperatures ranging from 1350°C to 1700°C.
Products Composition
Corundum mullite saggar is produced from carefully selected high-purity raw materials, typically including:
High-grade alumina (Al₂O₃)
Synthetic or natural mullite
Low-alkali binders and additives
Through controlled sintering at ultra-high temperatures, the material forms a stable microstructure dominated by corundum phase (α-Al₂O₃) and interlocking mullite crystals.
This microstructure provides:
High refractoriness
Low creep deformation under load
Excellent resistance to chemical attack
Long-term dimensional stability
The optimized grain size distribution and low open porosity ensure consistent performance throughout repeated kiln cycles.
Product Parameters
|
Specifications |
|||||||
|
Brand |
Al2O3 (%) |
SiO2 (%) |
Fe2O3 (%) |
Porosity (%) |
Bulk Density (g/cm3) |
Cold Crushing Strength(Mpa) |
Operating Temperature(oC) |
|
GYS/95 |
90-92 |
8-6 |
<0.15 |
18 |
2.8-2.85 |
90 |
≤1750 |
|
GYS/85 |
82-85 |
17-15 |
<0.2 |
19 |
2.7-2.75 |
75 |
≤1700 |
|
GYS/75 |
72-75 |
26-23 |
<0.3 |
20 |
2.5-2.55 |
60 |
≤1600 |
|
GYS/65 |
65-70 |
32-27 |
<0.3 |
20 |
2.5-2.55 |
50 |
≤1500 |
Key Features of Corundum Mullite Saggar:
High load-bearing capacity suitable for stacked firing and heavy ceramic components
Excellent thermal shock resistance, reducing cracking during heating and cooling
Low creep deformation under long soaking times
Strong resistance to alkali vapors and glaze attack
Stable dimensions after repeated firing cycles
Long service life, reducing replacement frequency and operating costs
Product Applications
Corundum mullite saggar is widely used in:
Electronic ceramics firing
Lithium battery cathode and anode material sintering
Technical and structural ceramics
Advanced refractory product firing
Powder metallurgy and specialty materials
It is often used together with corundum mullite support trays and beams to form a complete kiln furniture system.
Performance Advantages in Industrial Kilns
Superior Load Stability
Corundum mullite saggar maintains structural integrity even under continuous high-temperature load. This makes it particularly suitable for firing environments where sagging or warping would lead to product deformation or kiln damage.
Excellent Thermal Cycling Resistance
Repeated heating and cooling cycles are unavoidable in industrial kilns. The corundum–mullite structure absorbs thermal stress effectively, minimizing crack propagation.
Chemical and Atmospheric Resistance
In kilns firing electronic ceramics or battery materials, volatile compounds and alkali vapors are common. Corundum mullite saggar resists chemical penetration better than standard mullite or cordierite products
Design Options and Customization
To meet different kiln conditions and production requirements, corundum mullite saggar can be customized in:
Size and wall thickness
Shape (round, square, rectangular, special geometry)
Reinforced ribs or edge structures
Surface treatment for improved release and wear resistance
Customized designs help optimize load distribution and extend service life under specific firing conditions.
Product technology:
The production of Corundum Mullite Saggers involves advanced technology and rigorous quality control to ensure superior performance. Key steps include:
Key steps include:
Raw Material Selection
High-purity alumina and mullite materials are selected to ensure chemical stability.
Batching and Mixing
Precise formulation controls thermal and mechanical performance.
Forming
Isostatic pressing or casting is used to achieve uniform density.
Controlled Drying
Prevents internal stress and cracking.
High-Temperature Sintering
Fired at temperatures above 1600°C to develop final strength.
Inspection and Quality Control
Dimensional accuracy, density, and load resistance are strictly checked.
Why Choose Us?
23+
years experience focus on refractories field
2 plants
with 3 sets of tunnel kilns for 120,000 tonnes capacity
3 QC
Labs Technology Centres
120+ employees
with ISO9001,TUV,SGS,Intertek certifications
100+
abroad customers in 50+ countries
20+
major industry furnace projects yearly
Packing
Protective inner packaging
Export-grade wooden pallets or crates
Shock-resistant stacking
Moisture protection for long-distance shipping
Handling, Installation, and Use Recommendations
Avoid impact during transport and loading
Ensure even load distribution inside the saggar
Control heating and cooling rates, especially in mid-temperature zones
Clean residue and glaze deposits regularly
Proper handling and operation significantly extend the service life of corundum mullite saggar.
FAQ
Q1: What is the maximum working temperature of corundum mullite saggar?
A1: Depending on grade and design, it can operate continuously at 1600–1700°C.
Q2: How does corundum mullite saggar compare with cordierite saggar?
A2: Corundum mullite saggar offers higher load strength and longer service life at high temperatures.
Q3: Can saggar size be customized?
A3: Yes, customized dimensions and structures are available for specific kiln layouts.
Q4: What causes cracks in corundum mullite saggar?
A4: Uneven loading, rapid temperature changes, or improper handling are common causes.
Q5: Is it suitable for lithium battery materials?
A5: Yes, it is widely used for cathode and anode material sintering.
Q6: How can service life be extended?
A6: Proper material selection, optimized loading, and controlled kiln operation are key.
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