Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
TOWARDS THE FLOWABILITY AND SPREADABILITY OF CEMENTED CARBIDES AND CERMET POWDERS FOR ADDITIVE MANUFACTURING: EXPERIMENTAL AND NUMERICAL APPROACH – PART 1
Submission Author:
Fabio Miranda , SP
Co-Authors:
Fabio Miranda, André Maiolini, Marcelo Otavio dos Santos , Daniel Rodrigues, Suzilene Real Janasi, Gilmar Batalha
Presenter: Fabio Miranda
doi://10.26678/ABCM.COBEM2023.COB2023-0100
Abstract
Powders processed by rotary electrode via plasma are perfectly spherical particles with smooth, fine and uniform surfaces and are the most requested for additive manufacturing, mainly for the PBF-L technique, due to their good flowability and the ease of providing a continuous flow in the powder bed. However, the cost of raw materials is very high and dependence on imports can become problematic situations in the product supply chain. Substituting irregular, cohesive powders with coarse textures results in poor flowability and interruption of powder flow in the ducts and powder bed. One of the major challenges for this work will be to analyze the dry flowability of WC and NbC refractory elements mixed with Co and Ni. For this, a container-type vibrating device was developed, with a capacity of 1.5 kg, coupled with a compacting roller that allowed to drain by gravity and vibration, ranging from 0.25 MPa to 0.35 MPa, for metallic sieves, with meshes varying between #35mesh (500 µm) and #50 mesh (300µm), and at the same time promote the compressibility of the mixtures in the powder bed. The survey of dry flow characteristic curves was obtained and the packing of these mixtures in the powder bed were analyzed.
Keywords
metal powders, PBF-L, Cemented carbides, Cermets, new flowability strategy
