High temperature refractory Cordierite mullite saggar for powder firing

The physical properties (i.e., density/porosity, linear shrinkage, ignition loss, bending strength and residual strength), thermal shock resistance and durability of the saggar in the synthesis of Li(Ni0.5Co0.2Mn0.3)O2 (LNCM) as a ternary cathode material were investigated.

The results show that the cordierite-mullite saggar with 12.50 wt % α-Al2O3 addition prepared at 1420 °C has the optimum properties (i.e., the bending strength of 11.3 MPa, the residual strength of 8.6 MPa and the residual strength retention rate of 76 % after three cycles of thermal shocks) and a prolonged service life at 1000 °C and 4 h for 20 times.

This is because the saggar is attacked by Li2O to generate LiAlSiO4 and LiAlO2 with higher thermal expansion coefficients, and LiAlSiO4 and LiAlO2 fill the pores to compact the structure of the permeable layer in the high-temperature synthesis of LNCM. As a result, a protective layer decreases the likelihood of the reaction with coordinate and mullite to increase the durability of the saggar in the high-temperature synthesis of LNCM.

However, as the time of erosion cycle further increases (i.e., >20 times), the thermal expansion mismatch between LiAlO2/LiAlSiO4 and cordierite/mullite can produce more cracks, declining the mechanical properties of saggar and thus damaging the saggar.

It has high thermal-shock property, which allows high speed firing and rapid cooling. It offers high purity and porosity, and is capable of dealing with special shapes.

Powder firing ,ceramic firing and so on.