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Micrograded ceramic-metal composites

2019; Elsevier BV; Volume: 39; Issue: 12 Linguagem: Inglês

10.1016/j.jeurceramsoc.2019.03.018

1873-619X

Thomaz Augusto Guisard Restivo, Rafael Fonseca Beccari, Wellington Rafael Padilha, Michelangelo Durazzo, Victor Bridi Telles, Jorge Luís Coleti, Chieko Yamagata, A.C. Silva, Eduardo Matheus Ricciardi Suzuki, Jorge Alberto Soares Tenório, Sonia Regina Homem de Mello-Castanho,

Additive Manufacturing and 3D Printing Technologies

The article shows new designed cermets and processes concerning primary to applications as thermal insulation materials with low emissivity. A new projected microstructure was obtained where dense regions (micropellets) rest inside the main porous pellet. The feature resembles a frozen hypercube, therefore such architecture is called hyper-pellet/ cermet. The processing method to obtain the hyper-cermet is based on sequential tape castings and sintering techniques. Ni-zirconia lamellae were prepared by a special mechanochemical process followed by sintering, which remain inside the main pellets as a dense region. The whole pellet is turned to be porous by employing pore-forming additives. All the constituents and porosity shapes are aligned along the disc/ flake planes. Thermal conductivity is estimated for the materials up to 800 °C by a flash diffusivimeter. Ceramographic analyses show graded density regions with directional constituents and pores. Applications of such materials are foreseen as temperature insulation materials and thermal radiation shields.