Concluding Remarks

Scheffler, Michael; Colombo, Paolo

doi:10.1002/3527606696.notes

Cited by 80 publications

(155 citation statements)

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“…These were larger than those observed for AC with 0.25% Al, which indicates the coalescence of the pores in mixtures with higher Al content. Scheffler and Colombo explained the coalescence of the pore to the high reactivity of the Al powder [23]. The fracture surfaces of the AC samples with different Al contents in this study are shown in Figure 5.…”

Section: Density and Porositymentioning

confidence: 93%

Mechanical properties of lightweight aerated concrete with different aluminium powder content

Shabbar

Nedwell

2017

MATEC Web Conf.

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Abstract. Aerated concrete is produced by introducing gas into a concrete, the amount dependent upon the requirements for strength. One method to achieve this is by using powdered aluminium which reacts with the calcium hydroxide produced upon hydration of the cement. The aim of the current study was to investigate the influence of the powder content on the mechanical properties of aerated concrete namely; compressive and flexural strengths, modulus of elasticity, density and porosity. The results indicated that an increase in aluminium content caused a decrease in the compressive and tensile strengths. It also produced a decrease in the modulus of elasticity. When the aluminium content increased, the density decreased and the porosity increased.

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Section: Density and Porositymentioning

confidence: 93%

Mechanical properties of lightweight aerated concrete with different aluminium powder content

Shabbar

Nedwell

2017

MATEC Web Conf.

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“…Porous ceramics are widely used in various versatile applications, such as liquid gas filters, catalysis supports, gas distributors, insulators, preforms for metal-impregnated ceramic metal composites, and implantable bone scaffolds [1,2]. Unlike in metallic or polymeric products, pores have been traditionally avoided in ceramic components because of their inherently brittle nature [3,4].…”

Section: Introductionmentioning

confidence: 99%

Porous Ceramics

Sarkar¹,

Kim²

2015

Advanced Ceramic Processing

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The unique chemical composition and microstructure of porous ceramics enable the ceramic products used in a number of applications such as filtration of molten metals and hot corrosive gases, high-temperature thermal insulation, support for catalytic reactions, filtration of diesel engine exhaust gases, etc. These applications take advantage of special characteristics of porous ceramics such as low thermal mass, low thermal conductivity, controlled permeability, high surface area, low density, and high specific strength. In this chapter, we emphasize on direct foaming method, a simple and versatile approach that allows fabrication of porous ceramics with tailored microstructure along with distinctive properties. Foam stability is achieved upon controlled addition of amphiphiles to the colloidal suspension, which induce in situ hydrophobization, allowing the wet foam to resist coarsening upon drying and sintering.

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“…At the early stage, there is a slight weight loss of about 5% within the temperature range of 30°C to 100°C. This may be due to the removal of moisture in the wood precursors which results in dehydrocellulose condition [3]. The woods started to lose most of their weight at temperature about 275°C to 380°C that causes almost 70% of weight loss.…”

Section: Thermogravimetric Analysis (Tga)mentioning

confidence: 99%

“…The weight loss during pyrolysis process was complete at 600°C. The stage of graphitic carbon formation began above 600°C, which is necessary for infiltration process in next stage [3]. At the end of pyrolysis of wood preform, a carbon template structure were produced which is essential for silicon infiltration process.…”

Section: Thermogravimetric Analysis (Tga)mentioning

confidence: 99%

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Conversion of biomorphic silicon carbide from wood powders carbon template

Elias

Hyie

Kalam

et al. 2016

AIP Conference Proceedings

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Abstract. Ecoceramic product produced by natural and renewable resources is a new variety of materials which has been widely used in industries over the recent years. A novel process regarding the fabrication of biomorphic silicon carbide ceramics has been explored from natural wood waste. The synthesis of biomorphic silicon carbide (SiC) requires two crucial processes, which are pyrolysis and silicon infiltration. In this study, the processing and characterization of silicon carbide ceramics from natural wood powders precursor was investigated by using two types of Asian wood powders, which are Kapur and Dark Red Meranti. The fine wood powders were hot pressed to obtain pre-templates, which then undergo carbonization process to form carbon templates. Pyrolysis up to 850°C was conducted in Argon flow atmosphere to produce the carbon template. The carbon template was then converted into biomorphic SiC ceramics through liquid infiltration at 1500°C. This study was to investigate the effect of infiltration holding time on the formation of dense SiC. Three different holding times of 2 to 4 hours were used during the infiltration process. Thermogravimetric analysis (TGA) was done to investigate the weight loss of wood during pyrolysis. Scanning electron microscopy (SEM) and energy dispersive x-ray (EDX) analysis were used to analyze the characteristics of the biomorphic silicon carbide. The density was determined by Archimedes method whereas Vickers hardness test was used to investigate the mechanical properties of the SiC. A homogenous microstructure was found in dense SiC consisting less than 1μm diameter of pores. The density and hardness of the samples were found to be increase as the holding time was increased. It was found that the conversion rate of carbon into SiC was improved with the increase in holding time.

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Concluding Remarks

Cited by 80 publications

References 0 publications

Mechanical properties of lightweight aerated concrete with different aluminium powder content

Mechanical properties of lightweight aerated concrete with different aluminium powder content

Porous Ceramics

Conversion of biomorphic silicon carbide from wood powders carbon template

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