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Ceramic Rheology

Ceramic "fluids" (slips, suspensions, pastes) have a wide range of flow properties. These flow properties vary not only by binder and filler constitution, but by manufacturer and by production batch to batch. It is accepted that ceramics vary, and accepted that some control of the variation should be employed. In terms of flow characterisation, this leads to two major questions :- 1. What is the rheology of this particular ceramic fluid ? and 2. What has changed between batches ?
Ceramic fluid rheology covers a number of properties - shear viscosity, wall slip, extensional viscosity yield stress. Each of these properties plays a prevalent role at different points in a process ( request DrRheology Technical QuickSheet for extrusion, injection and spraying of ceramic suspensions and pastes). These properties can vary independently and so it is important to characterise the correct property for a given application. DrRheology offers the measurement of a range of rheological properties. We can also model a process and show the relevant changes that can be expected.

Going about the job of testing.

Testing always can be classified as either 1. We don't know what it is, and we're finding out about it. or 2. We know what it should be, and we're just checking. The first kind of testing requires some time to check on the fundamentals - is the flow stable? is the temperature optimum ? does it degrade? is it repeatable ? is there significant inhomogeneity ? The second kind of test is generally referred to as QC testing, where we simply repeat what we did before.

Testing for processability should generally be done at rates, pressures and temperatures that resemble those found in the process. For this kind of work, we will generally recommend a capillary rheometer or an extruder. For sedimentation in suspensions we will generally recommend a rotational rheometer. We can supply results as raw data, or as a model. We can also supply calculated and CFD models of the flow in a process.

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Shear Viscosity

Measured on lab rotational rheometer
Ideal for yield stress of slips and suspensions (for sedimentation).
Note - we would recommend that for yield stress in viscous pastes that this measurement should be carried out on a capillary unit.
Request for testing

Shear Viscosity

Measured on lab capillary rheometer (request poster)
Ideal for processing data
Data available fitted to standard models
Degradation testing available
Wall slip
Request for Shear Viscosity testing

Wall Slip


Measured using capillary flow
Multiple measurements analysed to give -
- correct shear viscosity
- extensional viscosity
- wall slip
Request for Wall Slip testing

Yield Stress


Measured on lab capillary rheometer
Ideal for processing data
Measures shape retention in extrusion of pastes
Request for Yield Stress testing

Extensional Viscosity


Measured using contraction flow
Sensitive measurement of binder and filler formulations
Measurement of spraying behaviour for suspensions
Sensitive measurement of degradation
Rupture stress
Request an example of the change in extensional viscosity with formulation changes.
Request for Extensional Viscosity testing

Analysis of your existing data

We can take your existing data files and :-
Fit data to any standard model
Fit data to shear, extension and slip.
Request for Rheology analysis

Calculation of process effect

We can calculate :-
1. The process pressures that will result from the measurements on your material
2. The process changes that will take place as a result of changes to the fluid
Request for Process Calculation

Rheometer Training

We can train your staff to make a range of measurements and on how to interpret and use the data.
Request for Rheometer training

PIM - Testing, analysis & training

PIM materials when tested on a rheometer gives the user a lot of understanding about the material: - how good the formulation is, how stable the formulation is, how repeatable the material is in batch production, how the material can be processed.
At DrRheology, we can not only test your materials, but advise on formulation and use.
Request an example of various rheology curves from different PIM formulations.
Request for PIM testing, analysis & training

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