Abstract
MoSi2 is an electrically conductive material with numerous applications mostly in high‐temperature environments. Herein, the production of MoSi2‐containing resistive heating elements by ceramic injection molding (CIM) is described. The sintered parts consist of MoSi2 particles embedded in a matrix of vitrified feldspar and Al2O3. The conductivity of sintered parts can be tuned precisely by varying the content of the conductive phase. For the development of the injection‐molding feedstock, four binder systems are evaluated. The corresponding feedstocks are injection molded into different geometries in traditional molds as well as in additively manufactured, soluble molds. For each feedstock, a debinding and sintering routine is elaborated based on thermogravimetric measurements. Higher debinding temperature leads to more oxidation of MoSi2 and less conductive samples. Therefore, the conductivity as well as density of sintered parts is used to evaluate the applicability of the feedstocks. Finally, glow tests prove that MoSi2/Al2O3/feldspar composite parts can be used as heating elements and by combining infrared temperature measurement data with computational simulations important material data such as thermal and electrical conductivity and thermal capacity can be obtained reliably.
Highlights
Ceramic injection molding allows fabrication of complex components with high throughput and high precision.[1]
Hocker ICP Institute of Computational Physics leading to a complete degradation of the material into MoO3 and SiO2.[5,6,15] In this study, MoSi2 particles were protected by embedding them in a glassy matrix
The binder content has to be optimized to match the rheological requirements for the specific application and the injection molding machine used
Summary
Ceramic injection molding allows fabrication of complex components with high throughput and high precision.[1]. Hocker ICP Institute of Computational Physics leading to a complete degradation of the material into MoO3 and SiO2.[5,6,15] In this study, MoSi2 particles were protected by embedding them in a glassy matrix. A mixture of MoSi2 (for conductivity), feldspar (as a glass-forming agent), and Al2O3 was used. The Al2O3 particles improve the mechanical strength of the sintered parts and allow. Debinding and sintering conditions were evaluated and optimized and important properties such as conductivity, strength, and density of the injection-molded and sintered parts fabricated with the different binder systems were compared. A recently developed method[19] was used to injection mold a range of heating element geometries, such as an M-shaped loop, a spiral, and a helix
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