Open-Cell Metallic Porous Materials Obtained Through Space Holders—Part I: Production Methods. A Review

2016 ◽  
Vol 139 (5) ◽  
Author(s):  
Lenko Stanev ◽  
Mihail Kolev ◽  
Boris Drenchev ◽  
Ludmil Drenchev
Keyword(s):  
Liquid Phase ◽  
Porous Materials ◽  
Inorganic Materials ◽  
Structure Parameters ◽  
Porous Structures ◽  
Structural Elements ◽  
Open Cell ◽  
Production Methods ◽  
Flexible Application ◽  
Removal Technique

This article presents a review of current methods for production of metallic open-cell porous materials through space holders. The methods are divided into two major groups: on the basis of sintering and using liquid phase processing. Details about technologies are given, and their relations to structure parameters of obtained materials are discussed. Methods with 11 different space holders are described. The space holders could be metallic or nonmetallic (organic and inorganic) materials which could be leached or burned depending on removal technique. It is concluded that the flexible application of different space holders offers opportunities for obtaining large variety of metallic porous structures. A new line of development should be elaboration of complex techniques for production of porous structure with graded pore size and/or porosity which will meet various engineering requirements and will open new possibilities for applications as functional and structural elements. The next part of this work is devoted to the structure, the properties, and application of the open-cells porous materials obtained through space holders.

scholarly journals Hydrogels as Porogens for Nanoporous Inorganic Materials

Gels ◽  
2018 ◽  
Vol 4 (4) ◽  
pp. 83 ◽  
Author(s):  
Christian Weinberger ◽  
Dirk Kuckling ◽  
Michael Tiemann
Keyword(s):  
Metal Oxides ◽  
Porous Materials ◽  
Nucleation And Growth ◽  
Inorganic Materials ◽  
Organic Component ◽  
Organic Polymer ◽  
Metal Chalcogenides ◽  
Soft Or ◽  
Polymer Hydrogels ◽  
Synthesis Of Materials

Organic polymer-hydrogels are known to be capable of directing the nucleation and growth of inorganic materials, such as silica, metal oxides, apatite or metal chalcogenides. This approach can be exploited in the synthesis of materials that exhibit defined nanoporosity. When the organic polymer-based hydrogel is incorporated in the inorganic product, a composite is formed from which the organic component may be selectively removed, yielding nanopores in the inorganic product. Such porogenic impact resembles the concept of using soft or hard templates for porous materials. This micro-review provides a survey of select examples from the literature.

Performance Oriented Design of Semiregular Anisotropic Porous Structures

2018 ◽  
Author(s):  
Chao Xu ◽  
Lili Pan ◽  
Ming Li ◽  
Shuming Gao
Keyword(s):  
3D Printing ◽  
Porous Materials ◽  
Design Problem ◽  
Degrees Of Freedom ◽  
Design Space ◽  
Manufacturing Technology ◽  
Porous Structures ◽  
Precise Control ◽  
And Performance

Porous materials / structures have wide applications in industry, since the sizes, shapes and positions of their pores can be adjusted on various demands. However, the precise control and performance oriented design of porous structures are still urgent and challenging, especially when the manufacturing technology is well developed due to 3D printing. In this study, the control and design of anisotropic porous structures are studied with more degrees of freedom than isotropic structures, and can achieve more complex mechanical goals. The proposed approach introduces Super Formula to represent the structural cells, maps the design problem to an optimal problem using PGD, and solves the optimal problem using MMA to obtain the structure with desired performance. The proposed approach is also tested on the performance of the expansion of design space, the capture of the physical orientation and so on.

Adsorption of single and mixed haloacetonitriles on silica-based porous materials: Mechanisms and effects of porous structures

2019 ◽  
Vol 79 ◽  
pp. 346-360 ◽  
Author(s):  
Panida Prarat ◽  
Chawalit Ngamcharussrivichai ◽  
Sutha Khaodhiar ◽  
Patiparn Punyapalakul
Keyword(s):  
Porous Materials ◽  
Porous Structures

scholarly journals Design of Mechanical Properties of Open-Cell Porous Materials Based on μCT Study of Commercial Foams

2015 ◽  
Vol 30 ◽  
pp. 03005 ◽  
Author(s):  
Jakub Skibinski ◽  
Karol Cwieka ◽  
Tomasz Wejrzanowski ◽  
Krzysztof J. Kurzydlowski
Keyword(s):  
Mechanical Properties ◽  
Porous Materials ◽  
Open Cell

Mechanical Analysis of Functionally Graded Porous Structures: A Review

2020 ◽  
Vol 20 (13) ◽  
pp. 2041015
Author(s):  
Helong Wu ◽  
Jie Yang ◽  
Sritawat Kitipornchai
Keyword(s):  
Porous Materials ◽  
Material Properties ◽  
Mechanical Analysis ◽  
Functionally Graded ◽  
Future Research ◽  
Spatial Gradient ◽  
Porous Structures ◽  
Research Activities ◽  
Key Factor ◽  
New Generation

Functionally graded porous structures (FGPSs), characterized by a continuous spatial gradient in both porosity and material properties, have been considered as the new generation lightweight structures. Research activities on FGPSs have grown rapidly in recent years. This paper is devoted to review the existing research works on FGPSs and to highlight the important advances in this emerging area. It consists of: (i) a brief introduction of porous materials and Functionally graded porous materials (FGPMs); (ii) an elaboration of the key factor and micromechanical models related to material properties of FGPMs; (iii) a comprehensive review of mechanical analysis of FGPSs; (iv) a detailed discussion of the main challenges and future research directions; (v) a conclusion.

Characterization of laminar flow in periodic open-cell porous structures

2019 ◽  
Vol 201 ◽  
pp. 397-412 ◽  
Author(s):  
Pedro Jorge ◽  
Miguel A.A. Mendes ◽  
Eric Werzner ◽  
José M.C. Pereira
Keyword(s):  
Laminar Flow ◽  
Porous Structures ◽  
Open Cell

Metallic Foams Obtained from Nickel Based Superalloy Hollow Spheres

2011 ◽  
Vol 672 ◽  
pp. 141-144 ◽  
Author(s):  
Ioan Vida-Simiti ◽  
Nicolaie Jumate ◽  
Emil Bruj ◽  
Niculina Sechel ◽  
György Thalmaier ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Catalyst Support ◽  
Hollow Spheres ◽  
High Porosity ◽  
Structural Elements ◽  
Metallic Foams ◽  
Hollow Particles ◽  
Nickel Based Superalloy ◽  
Shock Absorbers ◽  
Thermal Barriers

In this work, hollow spherical nickel based superalloy powders obtained by liquid phase atomization were used. The obtained powder was divided into six size particle ranges between 200 µm and 630 µm using a shatter box. Samples from all six ranges were obtained by spreading the powder into the sintering die and consolidating them by sintering at 900°C and 1000°C for 30 minutes in vacuum (10-4 Torr). The metallic foams obtained by sintering hollow particles presents high porosity, and can be used as thermal barriers, catalyst support, shock absorbers or lightweight structural elements.

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