Gel-casting of porous alumina ceramics with high mechanical strength
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Samaneh Ghofrani
Abstract
Alumina foams with high mechanical strength were prepared by means of gel-casting. After preparation of gel-cast raw segments, they were dried in a controlled humidity chamber. Samples were sintered at a temperature of 1 350 °C held for 2 h. The effects of additives and alumina loading on the initial suspension behavior, ultimate porosity, relative density, and mechanical strength of sintered samples were investigated by means of different techniques including densitometry, scanning electron microscopy and compressive strength measurements. Results showed that the optimal conditions for the preparation of desired alumina foam are 0.03 wt.% of sodium dodecyl sulfate, 1 g L−1 of initiator and 8.3 mL L−1 of catalyst for suspensions with 0.8 – 1 wt.% of Tiron and 70 % of alumina loading. The value of compressive strength was measured as high as 25.62 MPa for alumina foam with very low relative density of 19.27 %.
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© 2016, Carl Hanser Verlag, München
Artikel in diesem Heft
- Contents
- Contents
- Original Contributions
- Interdiffusion in bcc_B2 Ni–Al–Cu alloys at 1 173 K
- Hydrogen storage kinetics of nanocrystalline and amorphous NdMg12-type alloy–Ni composites synthesized by mechanical milling
- Phase equilibria in the Au–Bi–Sn ternary system at temperatures of 80, 125, and 150 °C
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- Wrought aluminium–magnesium alloys subjected to SPD processing
- Relationships between mechanical and tribological properties of Zn-15Al-based ternary and quaternary alloys
- Gel-casting of porous alumina ceramics with high mechanical strength
- Comparing predictions from constitutive equations and artificial neural network model of compressive behavior in carbon nanotube–aluminum reinforced ZA27 composites
- Identification of the effective thermal conductivity of a powdered composite using a genetic algorithm
- Short Communications
- Boride coating on the surface of WC–Co-based cemented carbide
- People
- Prof. Dr. Dr. h. c. mult. Günter Petzow on the occasion of his 90th birthday
- DGM News
- DGM News
Artikel in diesem Heft
- Contents
- Contents
- Original Contributions
- Interdiffusion in bcc_B2 Ni–Al–Cu alloys at 1 173 K
- Hydrogen storage kinetics of nanocrystalline and amorphous NdMg12-type alloy–Ni composites synthesized by mechanical milling
- Phase equilibria in the Au–Bi–Sn ternary system at temperatures of 80, 125, and 150 °C
- Microhardness of decorative gold coatings obtained from gold complex based on mercaptotriazole: Comparison with cyanide
- Friction and wear of diamond-like carbon film deposited on CoCrMo alloy under different lubrication
- Wrought aluminium–magnesium alloys subjected to SPD processing
- Relationships between mechanical and tribological properties of Zn-15Al-based ternary and quaternary alloys
- Gel-casting of porous alumina ceramics with high mechanical strength
- Comparing predictions from constitutive equations and artificial neural network model of compressive behavior in carbon nanotube–aluminum reinforced ZA27 composites
- Identification of the effective thermal conductivity of a powdered composite using a genetic algorithm
- Short Communications
- Boride coating on the surface of WC–Co-based cemented carbide
- People
- Prof. Dr. Dr. h. c. mult. Günter Petzow on the occasion of his 90th birthday
- DGM News
- DGM News
