Speaker
Description
Additive manufacturing using photolithography has now reached a level of technical development that enables the achievement of superior mechanical and physical properties. To achieve these properties, the specific characteristics of the materials—particularly their thermodynamic properties—must be taken into account. Common to both systems is the necessity of quantitatively removing the carbon, which is introduced into the system in large quantities as a processing aid, in order to achieve good properties. For stainless steels, thermal debinding in air has proven effective here, utilizing the stability of the surface oxide layer of the powders to prevent the introduction of additional oxygen, which is also undesirable. Low residual carbon levels can then be removed during the sintering process through reaction with the oxides. Excess oxygen is ultimately removed by the atmosphere (H2). With copper, however, debinding with air has not proven effective, as this leads to a significant increase in oxygen content. From a thermodynamic perspective, this oxygen is easily reducible with H2; however, when sintering copper, care must be taken to ensure that pore closing does not occur prior to the reduction processes, as this would otherwise cause blowing of the components
Solutions for both materials are presented and compared in this paper, and the specific characteristics of the debinding and sintering processes are discussed.
| Speaker Country | Austria |
|---|---|
| Would you like to publish your paper in the special issue of BHM "Berg- und Hüttenmännische Monatshefte" | Yes |