Influence of the Total Porosity on the Properties of Sintered Materials—A Review

Fernández, Fátima Ángela Ternero; Rosa, Luı́s Guerra; Urban, Petr; Montes, J. M.; Cuevas, F. G.

doi:10.3390/met11050730

Cited by 65 publications

(48 citation statements)

References 72 publications

(87 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The presence of pores has a remarkable impact on material’s properties. Relying on a significant number of models proposed [ 26 ], it is believed that the stiffness and hardness decrease from those of the fully dense material to practically zero as the porosity is increased from zero porosity to the porosity of freely settled powder. Additionally, for a given value of porosity, the property of porous material is proportional to the property of the skeletal material.…”

Section: Resultsmentioning

confidence: 99%

Microstructural, Mechanical and Corrosion Characteristics of Degradable PM Biomaterials Made from Copper-Coated Iron Powders

et al. 2022

View full text Add to dashboard Cite

Copper-containing iron-based materials have recently been recognized as potential biomaterials possessing antimicrobial ability. Since then, iron-copper systems have been prepared by different methods and investigated. This article is focused on PM materials made from composite powders. The powders, each particle of which consisted of an iron core and a copper shell, were prepared by electroplating. Test-pieces with copper contents of 0, 3.2, and 8 wt.% were fabricated by pressing and sintering from iron and composite powders. Some microstructural, mechanical, and corrosion characteristics of test-pieces were examined. Microstructures were composed of pores and iron grains with alloyed peripheral regions and copper-free cores. As the copper content in test-pieces was increased, their density and Young’s modulus decreased, and macrohardness, corrosion potential and corrosion current density increased. Likely causes of density and Young’s modulus reduction were higher porosity, low enough copper content, and compliant inclusions in stiff matrix. The increase in macrohardness was attributed to the precipitation hardening which prevailed over softening induced by pores. The increase in corrosion potential and corrosion current density was most likely due to the presence of more noble phase providing surfaces for a faster cathodic reaction.

show abstract

Section: Resultsmentioning

confidence: 99%

Microstructural, Mechanical and Corrosion Characteristics of Degradable PM Biomaterials Made from Copper-Coated Iron Powders

et al. 2022

View full text Add to dashboard Cite

show abstract

“…In bcc-structure type HEA cleavage provides a moderate degree of toughness but these alloys are in general more brittle than those of fcc-structure type structure. In general porosity in sintered materials is also detrimental for mechanical properties [28], the ratio of about 0.7 between macrohardness and microhardness is lower than expected with the measured densification 97%-95%, hinting at an additional brittleness mechanism. The segregation of brittle intermetallic phases at grain boundaries have been identified as detrimental to the fracture resistance of HEAs [27].…”

Section: Resultsmentioning

confidence: 67%

Improvement of Mechanical Properties with Non-Equimolar CrNbTaVW High Entropy Alloy

et al. 2022

View full text Add to dashboard Cite

CrNbTaVWx with (x = 1 and 1.7) high entropy alloys have been devised for thermal barriers between the plasma-facing tungsten tiles and the copper-based heat sink in the first wall of fusion nuclear reactors. These novel materials were prepared by ball milling and consolidated by Upgrade Field Assisted Sintering Technology at 1873 K under an applied pressure of 90 MPa for 10 min. In this work, the structural and mechanical properties of these materials were evaluated. Consolidated samples presented a major phase with a bcc-type structure with lattice parameter value of 0.316 nm for CrNbTaVW and CrNbTaVW1.7 compositions. Moreover, observation of the microstructures evidences also two minor phases: Ta-Nb-Cr and Ta-V rich (in which carbon is detected). Despite the similarity in the structural properties of these two alloys, their mechanical properties are distinct. The flexural stress for the sample with higher amount of W (CrNbTaVW1.7) is higher by 50% in the 298–873K range, with an increased strain to fracture, which can be associated with reduced brittleness caused by the additional W incorporation.

show abstract

“…Equation (1) [8] is a universal generalization that describes the dependence of the porosity of the investigated properties:…”

Section: Literature Reviewmentioning

confidence: 99%

Influence of Technological Manufacturing Conditions on the Porosity of Calcium-Phosphate Scaffolds

Chernobrovchenko¹,

Dyadyura²,

Balynskyi³

et al. 2021

JES

View full text Add to dashboard Cite

The implantation of bone substitutes depends on the material’s osteoconductive potential and the structure’s porosity Porosity is a characteristic feature of most materials. The porosity of materials has a strong influence on some of their properties, both structural and functional. An essential requirement for bone scaffolds is porosity, which guides cells into their physical structure and supports vascularization. The macroporosity should be large enough and interdependent for bone ingrowth to occur throughout the entire volume of the implant. The pore size for cell colonization in bioceramics is approximately 100 μm. Pores larger than this value promote bone growth through the material. This pore size allows the flow of growth factors and cell adhesion and proliferation, allowing the formation of new bone and developing the capillary system associated with the ceramic implant. Porosity also affects the rate of resorption of ceramics: the larger the number of micropores, the higher the dissolution rate. The investigated properties were elastic moduli, ultimate strength, compressive strength, and average apparent density. The results obtained in this work are consistent with previous studies, proving the positive role of microporosity in osseointegration and bone formation.

show abstract

Influence of the Total Porosity on the Properties of Sintered Materials—A Review

Cited by 65 publications

References 72 publications

Microstructural, Mechanical and Corrosion Characteristics of Degradable PM Biomaterials Made from Copper-Coated Iron Powders

Microstructural, Mechanical and Corrosion Characteristics of Degradable PM Biomaterials Made from Copper-Coated Iron Powders

Improvement of Mechanical Properties with Non-Equimolar CrNbTaVW High Entropy Alloy

Influence of Technological Manufacturing Conditions on the Porosity of Calcium-Phosphate Scaffolds

Contact Info

Product

Resources

About