Ceramics | Single point viscosity measurements and yield stress of clay suspensions
This application report provides a fast and simple test method for determining single point dynamic viscosity of clay suspensions using ViscoQC. Furthermore, it aims to provide a test method for determining the yield stress of clay suspensions.
The rheological behavior of clay suspensions plays a decisive role in the industrial production and processing of casting slip. The key parameters defining this behavior are viscosity and yield stress, both of which directly influence the flow, stability, and overall processing of ceramic slurries. Controlling viscosity helps to ensure homogeneous pouring, consistent layer formation, and predictable casting times. Deviations in flow behavior can lead to sedimentation, surface irregularities, or incomplete mold filling.
Additionally, the yield stress describes the stress required to initiate flow, making it a critical parameter for pumpability. Reliable viscosity measurements therefore serve as a fundamental tool for quality control, allowing early detection of changes in suspension structure and ensuring reproducible conditions for processing and mold filling. This report presents methodology and results of viscosity measurements performed on clay suspensions. Its findings aim to support quality control, improve process stability and stabilize product quality in ceramic manufacturing.
As a representative sample, casting slip from a local supplier was slightly diluted by the addition of water. It’s dynamic viscosity and yield stress were determined using the Anton Paar rotational viscometer ViscoQC 300.
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