Fabrication and characterization of anorthite foam ceramics having low thermal conductivity

Li, Ye; Cheng, Xudong; Gong, Lunlun; Feng, Junjie; Cao, Wei; Zhang, Ruifang

doi:10.1016/j.jeurceramsoc.2014.08.045

Cited by 65 publications

(28 citation statements)

References 24 publications

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“…Due to their lightweight, low‐thermal conductivity, high‐specific strength, high refractoriness and good chemical resistance, porous anorthite ceramics have been selected as one of the promising materials for thermal insulation applications . Meanwhile, some researches have been done on the fabrication and characteristic of porous anorthite ceramics in recent years . However, the relatively low‐mechanical properties restrict their application.…”

Section: Introductionmentioning

confidence: 99%

“…One way to improve the strength is to develop new fabricating processes. Many methods, such as direct‐foaming process, polymeric foam replication method, addition of a foaming agent, and foam‐gelcasting technique, have been developed to prepare porous ceramics. Among those methods, foam‐gelcasting method is found to be an effective way to prepare porous ceramics with high strength .…”

Section: Introductionmentioning

confidence: 99%

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Fabrication and properties of porous anorthite/mullite ceramics with both high porosity and high strength

Yang

et al. 2019

Int J Applied Ceramic Tech

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Porous anorthite/mullite ceramics with both high porosity and high strength have been successfully fabricated by foam-gelcasting and pressureless sintering technology, using α-Al 2 O 3 , SiO 2 , and CaCO 3 as starting materials and MnO 2 as sintering aids. The porous mullite ceramics prepared in this study had 83.3% porosity and 0.3 W/m·K thermal conductivity, exhibited compressive strength value as high as 6.1 MPa. The samples fabricated with mullite content of 30 mol% possessed 79.4% porosity and 5.9 MPa compressive strength showed thermal conductivity as low as 0.19 W/m·K. With the addition of MnO 2 , the properties of the prepared materials varied slightly when mullite content changed in a large scale. The results showed that the addition of MnO 2 promoted the reaction, affected sintering and grain growth, and contributed to high strength and low-thermal conductivity. K E Y W O R D Sanorthite, compressive strength, mullite, porosity, porous ceramics

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fabrication and properties of porous anorthite/mullite ceramics with both high porosity and high strength

Yang

et al. 2019

Int J Applied Ceramic Tech

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“…Highly porous ceramics provide a growing interest for multifunctional applications such as molten metal filtration, water treatment, catalyst support, and hot gas separation owing to their tunable pore structure and unique thermal properties . Hierarchical structuring of these materials is a burgeoning scientific field which attracts tremendous interests as it contains a vast range of porosity levels with multiple length scales .…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional (3D) flexible nanofibrous network knitting on hierarchical porous architecture

et al. 2018

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Hierarchical structured porous ceramics have attracted tremendous research interests because of their numerous excellent properties including robust mechanical strength and large surface area. In this work, silicon carbide (SiC)-based porous ceramics with three levels of pore hierarchy are fabricated from silicon particlestabilized foams and a subsequent one-step calcination after they were embedded with coke. Three-dimensional (3D) flexible nanofibrous network is adhered and wrapped on cell walls of porous ceramics, which is readily fine-tuned and tailored by the temperature to provide optimized pore structure. The resultant SiC-based porous ceramics present a density of 1.03 g/cm 3 at a porosity of 72% with a large quantity of hierarchical micro-and macropores. This hierarchical structure leads to robust compressive strength (23.52 MPa) and large surface area (64.32 m 2 /g). The fabrication method is straightforward and sought-after, providing a facile technical route for advanced hierarchical porous ceramics used in filtration and catalysis fields.flexible nanofibrous network, hierarchical porous architecture, mechanical properties, particle-stabilized foam, porous ceramics

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“…Through direct foaming and slip casting method, porous anorthite ceramics with low thermal conductivity were successfully prepared using fly ash and gypsum as raw materials. The results show anorthite ceramics with the highest open porosity (94%) and the lowest thermal conductivity (0.042 W/m·K) can be fabricated by adding 10% content of gypsum, 0.8% content of SHMP and using two‐step foaming process . Comprehensively, most research focus on the preparation and properties, while a little work has been done on the synthesis and grain growth of anorthite …”

Section: Introductionmentioning

confidence: 99%

“…The results show anorthite ceramics with the highest open porosity (94%) and the lowest thermal conductivity (0.042 W/mÁK) can be fabricated by adding 10% content of gypsum, 0.8% content of SHMP and using two-step foaming process. 9 Comprehensively, most research focus on the preparation and properties, while a little work has been done on the synthesis and grain growth of anorthite. 7,[10][11][12][13] As well known, composition and microstructure have great influence on properties.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and growth of anorthite crystal during in situ preparation of porous anorthite ceramics by foam‐gelcasting

Han

et al. 2017

Int J Applied Ceramic Tech

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Pure anorthite porous ceramics have been fabricated using γ‐Al2O3, CaCO3, and SiO2 as raw materials through foam‐gelcasting method. XRD, thermal analysis, SEM, and TEM were used to study the synthesis and grain growth of anorthite during the in situ process. The results indicated that the initiator (ammonium presulfate) took part in the chemical reaction to form CaSO4, which played an effective role during synthesis of anorthite. Besides, CaO and CaSiO2 were the other intermediate phase during synthesis. Anorthite first occurred at 1050°C, and it was the only phase after it sintered over 1260°C. With sintering temperature increasing from 1300°C to 1450°C, the large sphere pore wall got denser and the anorthite grains obviously showed platelike. It was deduced that the preferential growth of anorthite crystals was parallel to the (004) plane.

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Fabrication and characterization of anorthite foam ceramics having low thermal conductivity

Cited by 65 publications

References 24 publications

Fabrication and properties of porous anorthite/mullite ceramics with both high porosity and high strength

Fabrication and properties of porous anorthite/mullite ceramics with both high porosity and high strength

Three‐dimensional (3D) flexible nanofibrous network knitting on hierarchical porous architecture

Synthesis and growth of anorthite crystal during in situ preparation of porous anorthite ceramics by foam‐gelcasting

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