Resumo O objetivo foi estudar o processamento de materiais cerâmicos alumina com porosidade graduada a partir das técnicas freeze casting e colagem barbotina sequencial, utilizando hidróxido alumínio como fase sacrifício. Após conformação, caracterizada por microscopia eletrônica varredura, medidas aparente pelo princípio Arquimedes distribuição tamanho médio poros pela técnica porosimetria mer...

Copper (Cu) foams with high porosity of about 63–78% were processed by the freeze-casting (FC) and space-holder (SH) methods. The FC SH techniques yielded lamellar polygonal pore structures, respectively, similar porosities. deformation behaviors two different types Cu compared using uniaxial compression a simultaneous acoustic emission (AE) video recording analysis. It was found that compressi...

The hierarchical nacre-like three-dimensional (3D) assembly of porous and lightweight materials is in high demand for applications such as sensors, flexible energy storage harvesting devices, electromagnetic interference shielding, biomedical applications. However, designing a biomimetic architecture highly challenging due to the lack experimental approaches achieve necessary control over mater...

The use of photocatalysts to enhance the performance construction materials with large surfaces exposed sunlight has become an increasingly common practice in recent decades. Although material durability is crucial importance and extensively studied when incorporating new additions, very few studies have specifically addressed effects adding photocatalysts. This paper discusses effect TiO2-base...

Porous materials manufactured by freeze-casting are demonstrating potential application as oxygen carriers for the production and purification of hydrogen, or anode material lithium-ion batteries. However, to obtain required pore morphology sufficient mechanical strength, suspension processing parameters must be controlled. Fe2O3 nanoparticles/camphene suspensions were fabricated using stearic ...

Casting has many process variations depending upon the material, the type of pattern, mould and the pouring technique like sand casting, investment casting, die casting, squeeze casting and lost foam casting. Sand casting is the most widely used process which can be used to produce intricate parts in almost every metal that can be melted. Casting defects analysis is process of finding the root ...

The effect of casting pores on the very high cycle fatigue (VHCF) behavior of a directionally solidified (DS) Ni-base superalloy DZ4 is investigated. Casting and hot isostatic pressing (HIP) specimens were subjected to very high cycle fatigue loading in an ambient atmosphere. The results demonstrated that the continuously descending S-N curves were exhibited for both the casting and HIP specime...