PTCR
4Pages

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Catalog excerpts

PTCR - 1

simply high temperature technology With this data sheet we provide a general overview about PTCR. For further technical information, useful hints and application advice for the use of Process Temperature Control Rings PTCR please refer to our PTCR Much better measurement for the quantity of absorbed heat by the product, is the shrinkage of a ceramic ring made of defined material and optimised for the desired application The Process Temperature Control Ring PTCR has been developed to give a better representation of the firing/sintering processes to allow a tight control of the real amount of heat transferred, taking into account the above described influences. Trouble shooting and problem handling in the Cost-effective process control and optimisation Improvement of product quality Process control, as formulated in ISO 9001:2015

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PTCR - 2

simply high temperature technology The PTCR is a ceramic ring which shrinks if it is exposed to heat. The degree of shrinkage depends on the actual temperature in the kiln/furnace, the ability of the kiln/furnace to transfer the heat and the time it is exposed to the heat treatment. The amount of contraction - the amount by which the ring diameter has shrunk - is measured with a numerical or digital micrometer. For ease and for comparison, the shrinkage of PTCR - and therefore the total absorbed heat quantity - is converted by means of a chart into a single, fictitious conversion...

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PTCR - 3

simply high temperature technology PTCR can be placed at almost any location in the kiln/furnace, on kiln furniture, trolleys etc. The use of multilocation and multi-level positioning is recommended, as this provides the most insight into the temperature distribution within the kiln/furnace. Rings do not have to be measured before they are put into the kiln/ furnace, because differences are statistically corrected and integrated in the conversion chart. Sticking of the rings is prevented e.g. by placing a small amount of aluminum oxide powder (AI2O3) underneath the ring. Measurement After...

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PTCR - 4

simply high temperature technology In the process of establishing a standard, the firing/sintering process is characterized by mapping the ring temperatures of PTCR distributed throughout the kiln/furnace. This allows the "hot" and "cold spots" to be detected and defined. Using the heat treatment mapping, the firing process can than be optimized by offsetting heat sources or thermocouples as indicated by the variations in ring temperatures. As a rule of thumb, one degree of ring temperature (RT) corresponds to one degree Celsius. The exact relationship between ring temperature (RT) and...

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