Meaning
Gas displacement measurement provides a method for determining the true density of raw materials. Using precursor pycnometry, lab technicians inject helium or nitrogen into a sealed chamber containing a known mass of material. The gas fills every accessible crevice.
This provides a more accurate value than traditional liquid displacement methods.
Volume Displacement
Inert gases are used because their small atomic size allows them to penetrate into the smallest microscopic features. The volume displacement of precursor pycnometry relies on the ideal gas law to correlate pressure changes with the volume of the sample. Helium is the preferred medium.
Accuracy depends on the sensitivity of the pressure transducers. High precision sensors are needed for repeatable results.
Purity Assessment
Knowing the mass to volume ratio of the starting material is essential for predicting the final energy density of the finished electrode. Within the purity assessment of precursor pycnometry, manufacturers can detect if a batch of coke or resin contains hidden porosity. High density usually correlates with better structural integrity.
Quality Control
Monitoring the raw inputs ensures that the furnace settings remain appropriate for the incoming material. The quality control of precursor pycnometry identifies shifts in the supply chain that might lead to inconsistent carbonization. If the density changes, the yield will likely follow.
Stable inputs lead to stable outputs.
