Improved Heat Insulation and Mechanical Properties of Highly Porous YSZ Ceramics After Silica Aerogels Impregnation

2013 ◽  
Vol 96 (10) ◽  
pp. 3223-3227 ◽  
Author(s):  
Sa Li ◽  
Chang-An Wang ◽  
Liangfa Hu
Keyword(s):  
Mechanical Properties ◽  
Heat Insulation ◽  
Silica Aerogels ◽  
Highly Porous

scholarly journals Instrumented Indentation of Super-Insulating Silica Compacts

Materials ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 830 ◽  
Author(s):  
Belynda Benane ◽  
Sylvain Meille ◽  
Geneviève Foray ◽  
Bernard Yrieix ◽  
Christian Olagnon
Keyword(s):  
Mechanical Properties ◽  
Porous Silica ◽  
Silica Aerogels ◽  
Spherical Indentation ◽  
Porous Structures ◽  
Instrumented Indentation ◽  
Multi Scale ◽  
Precipitated Silica ◽  
Highly Porous ◽  
Porosity Fraction

Highly porous silica compacts for superinsulation were characterized by instrumented indentation. Samples showed a multi-scale stacking of silica particles with a total porous fraction of 90 vol %. The two main sources of silica available for the superinsulation market were considered: fumed silica and precipitated silica. The compacts processed with these two silica displayed different mechanical properties at a similar porosity fraction, thus leading to different usage properties, as the superinsulation market requires sufficient mechanical properties at the lowest density. The measurement of Young’s modulus and hardness was possible with spherical indentation, which is an efficient method for characterizing highly porous structures. Comparison of the mechanical parameters measured on silica compacts and silica aerogels available from the literature was made. Differences in mechanical properties between fumed and precipitated compacts were explained by structural organization.

scholarly journals Enhancing Density-Based Mining Waste Alkali-Activated Foamed Materials Incorporating Expanded Cork

CivilEng ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 523-540
Author(s):  
Imed Beghoura ◽  
Joao Castro-Gomes
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Pore Size ◽  
Physical And Mechanical Properties ◽  
Critical Parameters ◽  
Porous Structures ◽  
Foaming Agent ◽  
Al Powder ◽  
Highly Porous ◽  
Alkali Activated

This study focuses on the development of an alkali-activated lightweight foamed material (AA-LFM) with enhanced density. Several mixes of tungsten waste mud (TWM), grounded waste glass (WG), and metakaolin (MK) were produced. Al powder as a foaming agent was added, varying from 0.009 w.% to 0.05 w.% of precursor weight. Expanded granulated cork (EGC) particles were incorporated (10% to 40% of the total volume of precursors). The physical and mechanical properties of the foamed materials obtained, the effects of the amount of the foaming agent and the percentage of cork particles added varying from 10 vol.% to 40% are presented and discussed. Highly porous structures were obtained, Pore size and cork particles distribution are critical parameters in determining the density and strength of the foams. The compressive strength results with different densities of AA-LFM obtained by modifying the foaming agent and cork particles are also presented and discussed. Mechanical properties of the cured structure are adequate for lightweight prefabricated building elements and components.

A facile method to fabricate monolithic alumina–silica aerogels with high surface areas and good mechanical properties

2020 ◽  
Vol 40 (6) ◽  
pp. 2480-2488 ◽  
Author(s):  
Fei Peng ◽  
Yonggang Jiang ◽  
Junzong Feng ◽  
Liangjun Li ◽  
Huafei Cai ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Surface ◽  
Silica Aerogels ◽  
Surface Areas ◽  
Monolithic Alumina

Assembly of silica aerogels within silica nanofibers: towards a super-insulating flexible hybrid aerogel membrane

RSC Advances ◽  
2015 ◽  
Vol 5 (111) ◽  
pp. 91813-91820 ◽  
Author(s):  
Hongxia Zheng ◽  
Haoru Shan ◽  
Ying Bai ◽  
Xianfeng Wang ◽  
Lifang Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Silica Nanoparticle ◽  
Silica Aerogels ◽  
Nanofibrous Scaffold ◽  
Silica Nanofibers ◽  
Insulating Properties ◽  
Hybrid Aerogel

A robust flexible hybrid aerogel membrane with super-insulating properties and improved mechanical properties is developed by forming an interpenetrating silica nanoparticle network inside an electrospun silica nanofibrous scaffold.

Elastic and plastic mechanical properties of nanoparticle-based silica aerogels and xerogels

2021 ◽  
pp. 111569
Author(s):  
Michal Marszewski ◽  
Ali Dashti ◽  
Patricia E. McNeil ◽  
Maggie Fox ◽  
Vivian Wall ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Silica Aerogels

Mechanical properties of cellulose aerogels and cryogels

Soft Matter ◽  
2019 ◽  
Vol 15 (39) ◽  
pp. 7901-7908 ◽  
Author(s):  
Nela Buchtová ◽  
Christophe Pradille ◽  
Jean-Luc Bouvard ◽  
Tatiana Budtova
Keyword(s):  
Mechanical Properties ◽  
Compressive Modulus ◽  
Cellulose Materials ◽  
Highly Porous

Compressive modulus of highly porous and lightweight cellulose materials prepared via dissolution–coagulation and different drying routes.

Production of Biodegradable Board Using Corn Straw and its Mechanical Properties

2012 ◽  
Vol 602-604 ◽  
pp. 1190-1195 ◽  
Author(s):  
Ting Ting Wu ◽  
Xiu Lun Wang ◽  
Koji Kito
Keyword(s):  
Mechanical Properties ◽  
Renewable Resources ◽  
Heat Insulation ◽  
Human Life ◽  
Renewable Resource ◽  
Corn Straw ◽  
Experimental Conditions ◽  
Food Container ◽  
Plastic Materials ◽  
Technical Evaluation

In order to keep the sustainable developement of human life, renewable resources must be developed because of the limitation of fossil resources. Biomass as a renewable resource has been watched by all the world with interest. The purpose of this study is to utilize the biomass to produce biodegradable board. Corn straw was used to produce Bio-board with the process of refining, defibrating, forming and drying. The mechanical properties of the Bio-board were measured. Technical evaluation of the result shows that corn straw can be processed to produce Bio-board. The test for mechanical properties indicates that the rupture stress of Bio-board produced with the experimental conditions were 6.23MPa~16.95MPa and 8.6~23.5 times greater as compared with the polystyrene plastic used in food container. Therefore, the use of Bio-board as food packing container, heat insulation in architecture, mulch film in agriculture as a substitute for the chemical plastic materials is technically possible.

scholarly journals Expansion volume of alkali activated foamed cork composites from tungsten mining mud waste with aluminium

2019 ◽  
Vol 274 ◽  
pp. 03002
Author(s):  
Imed Beghoura ◽  
Joao Castro-Gomes ◽  
Haroon Ihsan ◽  
John Pickstone ◽  
Nuno Estrada
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Physical And Mechanical Properties ◽  
Mechanical And Thermal Properties ◽  
Porous Structures ◽  
Expansion Process ◽  
Foaming Agent ◽  
Al Powder ◽  
Highly Porous ◽  
Alkali Activated

Several mixes of alkali activated foams from tungsten mud waste (MW), grounded glass (GG) and metakaolin (MK) were developed incorporating expanded granulated cork (EGC). This study presents preliminary results of the expansion process obtained with the addition of aluminium (AL) powder as a foaming agent. 0.3 wt.%, 0.4 wt.% to 0.5wt.% of AL powder were added to the alkali activated matrix. The physical and mechanical properties of the obtained foams, the effects of the type and amount of the foaming agent added are presented and discussed. Highly porous structures were obtained, with overall expansion up to 68.2% when the AL powder was added. The size and distribution of pores are shown. The compressive strength of foams in the case of highly porous structures achieved of 1.2 MPa for the samples containing 0.5 wt.% of AL powder. Mechanical and thermal properties of the cured structure are good and can therefore be used for applications in acoustic panels and lightweight prefabricated components for thermal insulation purposes.

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