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2018
Conference Paper
Titel
Mechanical and Thermophysical Properties of Hardmetals at Room and Elevated Temperatures
Alternative
Mechanische und thermophysikalische Eigenschaften von Hartmetallen bei Raumtemperatur und erhöhten Temperaturen
Abstract
Hardmetals or cemented carbides are a widely-used material in cutting applications. To reach maximum efficiency in the cutting process the choice of the proper hardmetal grade is crucial. Often the selection is solely based on mechanical properties such as hardness and fracture toughness while in some cutting applications the selection should also be based on the thermal conductivity too. Thus, for cutting applications both mechanical and thermophysical properties are equally important. In this study different WC-Co hardmetals with the same nominal hardness at room temperature were fabricated by varying both WC grain sizes from nanoscaled to coarse and metallic (Co) binder contents. Hardness and thermal conductivity were determined in the range from room temperature up to 900 °C. Results show significant differences in thermal diffusivity and high temperature hardness of the materials with the same room temperature hardness. The influence of the microstructure on these properties will be discussed. While both mechanical as well as thermophysical properties of hardmetals have been studied separately before, a systematic study of both properties at once is missing. This study presents first results of both hardness and thermal diffusivity measurements as a function of WC grain size, metallic binder content and temperature.
Author(s)