Improving saggar lifetime in advanced materials processing through failure analysis and kiln modelling
In advanced materials manufacturing, particularly in battery electrode production, maintaining reliable high-temperature processing is a persistent challenge. Lucideon works with manufacturers to address this by improving the performance and lifespan of critical equipment such as refractory saggars, which are exposed to aggressive chemistries and repeated thermal cycling during firing and calcination.
As production volumes increase, particularly in response to demand from electric vehicles, the performance and reliability of these components become increasingly critical. As well as being a materials issue, saggar degradation is a process and cost challenge that directly impacts manufacturing efficiency.
Under typical operating conditions, saggars are subjected to a combination of chemical attack, thermal loading, and mechanical stresses. These factors act together over repeated firing cycles, gradually weakening the material. Failure rarely results from a single mechanism. Instead, it reflects the cumulative effects of interacting degradation processes within a specific manufacturing environment.
When failure occurs, the consequences can be significant. Breakage during processing can contaminate high-value powders, often resulting in the loss of an entire batch. In battery electrode manufacturing, where material purity and composition are closely linked to performance metrics such as energy density, even minor contamination can render material unusable. Depending on the scale of production, this can lead to the loss of tens of kilograms of product.
There are also wider operational impacts. Once exposed to process chemistries such as lithium compounds, failed saggars cannot be recycled and must be treated as hazardous waste, increasing disposal costs. In more severe cases, breakage can lead to unplanned kiln shutdowns while contamination is removed, adding further disruption and cost.
Identifying effective solutions is complicated by the variability inherent in these processes. Differences in electrode chemistries, firing atmospheres, thermal profiles, and saggar materials mean that there is no single approach that can be applied universally. Trialling alternative saggars without a clear understanding of failure mechanisms can be time consuming, costly, and unlikely to deliver consistent improvements.
A more effective approach is to start with detailed failure analysis. By examining how and where degradation initiates, it is possible to understand the interaction between the fired material, the kiln environment, and the saggar’s composition and design. This typically involves a combination of mechanical testing and advanced characterisation techniques, such as scanning electron microscopy and X-ray diffraction, to identify chemical and microstructural changes.
Once the underlying drivers are understood, potential improvements can be assessed through targeted testing. Smaller-scale or accelerated trials allow different materials, designs, or stacking configurations to be evaluated without disrupting full-scale production. This reduces both the cost and risk associated with process optimisation.
In parallel, advances in kiln modelling offer additional opportunities to improve saggar performance. Thermo-mechanical modelling can be used to predict strain development during firing and identify conditions that promote crack initiation. Modelling the kiln environment, including saggar arrangement and loading strategies, can also help optimise thermal uniformity and reduce localised stresses.
By combining failure analysis, targeted testing, and modelling, Lucideon supports manufacturers in taking a more systematic approach to improving saggar lifetime. This reduces reliance on trial-and-error methods, shortens development cycles, and supports more efficient scale-up of production processes.
