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Hot moulding of sintered silicon carbide
Heißgießen von gesintertem Siliziumcarbid
During the last 20 years, the injection moulding process which was originally developed for plastics processing, was successfully applied to the production of complex shaped ceramic structural elements. An interesting alternative way for forming complex shaped ceramics is the so-called hot moulding (low pressure injection moulding), which was originated in Russia more than 40 years ago. The basic idea of hot moulding is to manufacture a thermoplastic low-viscosity ceramic formulation which can be filled into the die at low pressure. The manufacture of pressureless sintered silicon carbide materials using hot moulding process was hindered by two unsolved problems up to now: - Realization of a high volume solid content (bigger than 50 Vol%) in the thermoplastic slip - Homogeneous distribution of the sinteractivating addtives (boron and carbon) in the thermoplastic slip. The Fraunofer-Facility of Ceramic Technologies and Sintered Materials (Dresden), the Institute of ChemicalTechnology D .I. Mendelejev (Moscow), and the former Saxonia Engineering Ceramics GmbH developed a process for the manufacturing of pressureless sintered silicon carbide by hot moulding.