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| Abstract No.: |
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Scheduled at:
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Wednesday, May 04, 2022, Hall G2 2:00 PM
Precision Melt Engineering
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| Title: |
Can thermal spraying revolutionize current tempering in plastics and metal processing?
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| Authors: |
Andreas Schacht* / RWTH Aachen University, Germany
K. Bobzin / RWTH Aachen University, Germany
H. Heinemann/ RWTH Aachen University, Germany
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| Abstract: |
In processes such as plastic injection molding or metal die casting, an efficient temperature control of the mold surfaces is crucial for part quality. As it is applied directly to the cavity surface, a thermally sprayed heating coating could provide dynamic heating features within a compact space. First, a heating coating system based on TiOx/Cr2O3 as resistive heater was investigated in a laboratory environment. Following field tests in plastic injection molding as well as in metal die casting supplemented the coating development. As a result, the developed heating coating system exhibits heating rates of more than 25 K/s while supplied with an electrical power of about 40 W/cm². While the ceramic coating system withstands the demands of plastics processing, its durability in metal processing is still restricted. However, the beneficial influence of the uniform heat input was observed in both processes. With the inclusion of such heating coatings, melt based processes may become more dynamic and efficient by directing the thermal energy exactly where it is required. In summary, the potential of thermally sprayed heating coatings for injection molding and die casting was demonstrated for the first time in practical tests.
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