High-purity mullite corundum refractory saggars with excellent thermal shock resistance and low metal contamination, designed for lithium battery NCM/NCA/LFP cathode high-temperature sintering. Custom sizes available.

Keywords: mullite corundum saggar, corundum mullite sagger, cathode sintering saggar, refractory ceramic saggar, kiln furniture

Changsha ZCXC New Materials manufactures high-performance mullite corundum saggars (also called corundum mullite refractory saggers) — premium kiln containers engineered for high-temperature sintering, calcination and firing processes up to 1750°C.

Formulated with a synergistic composite of α-alumina corundum and mullite (3Al₂O₃·2SiO₂), our saggars balance high structural strength, outstanding thermal shock resistance and ultra-low metal impurity release, making them the ideal consumable for lithium battery cathode materials, advanced ceramics and specialty glass production lines. We support full customization of size, wall thickness and material formula to match your roller kiln, tunnel kiln and pusher kiln parameters.

• Superior High-Temperature Stability

  Max continuous service temperature up to 1650°C, short-term peak temperature resistance up to 1750°C. No softening, deformation or creep under long-term high-temperature loading, suitable for multi-layer stacked sintering production.

• Excellent Thermal Shock Resistance

  The mullite phase brings low thermal expansion coefficient, maintaining structural integrity after rapid heating and cooling cycles, effectively reducing cracking rate and extending service life under frequent thermal cycling conditions.

• Ultra-Low Metal Contamination

  High-purity raw material formula with dense sintered microstructure, minimal elemental precipitation during high-temperature reaction. It avoids pollution to cathode active materials, ensures stable batch consistency of NCM811, NCA, LCO and other high-value powders.

• High Mechanical Strength

  Cold crushing strength ≥ 70 MPa, high load-bearing capacity. It supports dense stacking in kilns, improves single-kiln production capacity, and reduces breakage rate during transportation and automatic loading and unloading.

• Long Service Life & Cost Efficiency

  Optimized grain gradation and sintering process, with corrosion resistance to alkali lithium salts. The cycle life is significantly better than ordinary mullite saggars, reducing the frequency of consumable replacement and total production cost.

• Lithium Battery Industry:

  High-temperature sintering/calcination of NCM/NCA high-nickel ternary cathode, LCO lithium cobalt oxide, LFP lithium iron phosphate and LMO lithium manganate cathode materials, supporting roller kilns and tunnel kilns for mass production.

• Advanced Ceramics:

  Firing of structural ceramics, electronic ceramics, magnetic materials and cemented carbide powders.

• Specialty Glass & Refractories:

  Melting, refining and heat treatment of optical glass, technical glass and high-purity refractory raw materials.

• Powder Metallurgy:

  Sintering of rare earth materials, ceramic metal composite powders and other high-purity powders.

• Custom size, wall thickness, internal structure and lid design according to drawings
• Formula adjustment for specific working conditions (high temperature resistance, alkali corrosion resistance, high strength type, etc.)
• Matching design for different kiln types (roller kiln, pusher kiln, box furnace)

  

  

  

• Surface coating treatment to further improve corrosion resistance and service life