Effects of microsilica addition on the microstructure and properties of alumina foams

Huang, Keke; Li, Yuanbing; Li, Shujing; Wang, Li; Wang, Shihan

doi:10.1016/j.ceramint.2016.07.134

Cited by 20 publications

(5 citation statements)

References 9 publications

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“…Furthermore, their compressive strength decreases gradually, as demonstrated in Figure i. Sample MB4 with an apparent porosity of 93.8% possesses a compressive strength of 2.7 MPa, which is greater than those of ceramic filters. , …”

Section: Resultsmentioning

confidence: 91%

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Hierarchical Ceramic Foams with 3D Interconnected Network Architecture for Superior High-Temperature Particulate Matter Capture

Liu

Ren

Zhang

et al. 2019

ACS Appl. Mater. Interfaces

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Developing new filters for the effective removal of hightemperature particulate matter is of great importance but still remains a challenge. Herein, we demonstrate a novel and facile strategy for producing hierarchical ceramic foams with three-dimensional interconnected porous architecture via the combination of chemical grafting of pore-forming agent and polyurethane foaming technique. Carbamate groups are directly grafted onto carbon black surface to enhance its dispersion. Abundant micrometersized pores are generated on the cell walls of porous frameworks to form three-dimensional interconnected porous architectures, resulting in the mullite foam with high particulate matter removal efficiency and relatively low pressure drop. The optimized mullite foam exhibits integrated properties of high particulate matter removal efficiency (96.7%), ultralow pressure drop (35 Pa), and outstanding recyclability. Our results open new opportunities for fabricating efficient particulate matter filters used in high-temperature environmental fields.

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Section: Resultsmentioning

confidence: 91%

“…Sample MB4 with an apparent porosity of 93.8% possesses a compressive strength of 2.7 MPa, which is greater than those of ceramic filters. 38,39 3.3. Filtration Performance at High Temperature.…”

Section: Resultsmentioning

confidence: 99%

Hierarchical Ceramic Foams with 3D Interconnected Network Architecture for Superior High-Temperature Particulate Matter Capture

Liu

Ren

Zhang

et al. 2019

ACS Appl. Mater. Interfaces

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“…Temperature increase the melting of the mixture with the decrease in the amount of sodium hydroxide is compensated by addition of the silica fume into the mix. It is known that the silica fume has a high reactivity and improves the properties of various materials [30]. The porous material, obtained from mixing of silica fume and sodium hydroxide, foams at a temperature as low as 200 °С, but has no water resistance.…”

Section: Resultsmentioning

confidence: 99%

“…This standard determines that the water absorption is calculated as the difference in the mass of material in the dry state and after 1-hour immersion in water. The compressive strength of the pellets was determined by the following formula [30]:…”

Section: Experimental Methodsmentioning

confidence: 99%

Influence of Silica Fume on the Production Process and Properties of Porous Glass Composite

2023

Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.

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The article is devoted to the development of the composition and production of a porous glass composite for thermal insulation purposes using a single-stage technology with a reduced NaOH content at temperatures not exceeding 850 °C. Silica-containing natural (tripoli) and technogenic (silica fume) raw materials were used for the synthesis of glass composite. The composition of the charge based on tripoli and silica fume is proposed, which ensures the production of a porous glass composite using energy-saving technology. A mixture of tripoli and silica fume activated with sodium hydroxide is an alternative to the traditional method of producing foam glass materials. The high dispersion of raw materials, the amorphous-crystalline structure of tripoli and the amorphous structure of silica fume ensure a high reactivity of the charge. The novelty of the study lies in reducing the amount of alkali to 10.5% and obtaining a material with increased mechanical strength (up to 4 MPa). It is established that the increased mechanical strength of the material is due to the dissolution of residual quartz and crystallization of cristobalite, as well as the production of a homogeneous fine-porous structure of a porous glass composite with an average pore size of 0.6+ 0.2 mm. Addition of SiO2 to the charge in the form of silica fume in an amount from 10 to 50 wt.% reduces the foaming temperature from 860 to 820 °C and increases the strength of the material from 1.5 MPa (without silica fume) to 4 MPa (30 wt.% of silica fume). The resulting porous glass composite differs from traditional foam glass type heat insulators in increased strength and is considered as a thermal insulation and structural material. The article is of great practical importance, as it solves two problems. On the one hand, the expansion of the raw material base for the production of porous materials with the involvement of waste. On the other hand, the expansion of the scope of application by increasing the strength of the material.

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“…Foamed ceramics could be used as high-temperature thermal-insulating materials, gas filters and heat exchangers, due to their high porosities, low conductivities and high specific strengths [1][2][3][4][5][6][7][8][9]. Mullite [10][11][12][13][14] is a well-known refractory material with high resistance to chemical attack, high compressive strength, low thermal conductivity, etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of microsilica content on microstructure and properties of foamed ceramics with needle-like mullite

Zhou

Yan

et al. 2019

PAC

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In this study, five foamed ceramics with struts containing needle-like mullite were prepared by direct-foaming method using white clay, industrial alumina and microsilica powder as raw materials. The effects of microsilica content on the phase compositions, microstructures and properties of foamed ceramics were investigated. The results showed that the adding of microsilica decreased the average pore size and apparent porosity and increased the compressive strength and thermal conductivity of the foamed ceramics by affecting the properties of foamed slurry and reaction sintering process. The foamed ceramics with 10 wt.% microsilica content showed the best properties with high porosity of 75.8%, positive reheating linear change, compressive strength of 1.44 MPa and low thermal conductivity of 0.219 W/(m·K) (at 350°C).

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Effects of microsilica addition on the microstructure and properties of alumina foams

Cited by 20 publications

References 9 publications

Hierarchical Ceramic Foams with 3D Interconnected Network Architecture for Superior High-Temperature Particulate Matter Capture

Hierarchical Ceramic Foams with 3D Interconnected Network Architecture for Superior High-Temperature Particulate Matter Capture

Influence of Silica Fume on the Production Process and Properties of Porous Glass Composite

Effect of microsilica content on microstructure and properties of foamed ceramics with needle-like mullite

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