High temperature thermal barrier coatings from recycled fly ash cenospheres

Morquecho, Ana María Arizmendi; Chávez-Valdez, A.; Alvarez-Quintana, J.

doi:10.1016/j.applthermaleng.2012.05.004

Cited by 44 publications

(25 citation statements)

References 12 publications

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“…The volume was calculated by measuring dimensions of sample. The thermal conductivity and thermal effusivity were calculated using α*ρ* C p and ( k *ρ* C p ) 1/2 , respectively …”

Section: Methodsmentioning

confidence: 99%

“…Various methods have been developed to obtain thermal barrier coating like chemical vapor deposition (CVD) and plasma spray which has some disadvantages like high cost, consumes more time, complexity of process . It also as a filler in polymer, Al alloy, Mg or Mg alloy/cenosphere composites and light weight composites . These FAC also are mixed with cement in order to reduce density as well as to improve thermal insulation to the buildings .…”

Section: Introductionmentioning

confidence: 99%

“…The thermal diffusivity measure rate of transfer of heat from hot side to cold side in the material. It is calculated by α = k /ρ C p. Here, k is the thermal conductivity, ρ is the density and C p is the specific heat capacity. The product of ρ and C p is known as the volumetric heat capacity.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Light‐weight thermal insulating fly ash cenosphere ceramics

Urunkar

Pandit

Bhargava

et al. 2018

Int J Applied Ceramic Tech

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Light weight fly ash cenosphere (FAC) ceramic composites were developed by simple slip casting method. Thermal properties, Bulk density, Microstructure, flexural strength, and phase analysis of the FAC ceramic composites were measured. The results proved that the FAC have ability to lower bulk density and thermal conductivity effectively. The lowest thermal conductivity achieved for FAC ceramic composites (0.27 W/m.K) was further reduced 0.21 W/m.K by adding combustible additives ie activated charcoal and corn starch. The flexural strength, bulk density and thermal conductivity of FAC ceramic composites reduced consistently with an increase in FAC content. The maximum flexural strength of 13.45 MPa was achieved with 50% FAC and the minimum flexural strength of 4.07 MPa was obtained with 80% FAC. The open porosity increased from 35.51% to 43.76% and 38.19% with an addition of 15% activated charcoal and corn starch, respectively, when compared to no additives. The bulk density of 699, 619, and 675 kg/m3 was achieved with 80% FAC, 80% FAC with the addition of 15% activated charcoal and corn starch, respectively. The 80% FAC ceramic composite shows low thermal expansion coefficient 6.54 × 10−6/°C at the temperature of 50°C then it varies between 3.7 and 5 × 10−6/°C in the temperature range above 100°C. These results prove that the developed light weight FAC ceramic are excellent low‐cost thermal insulating materials.

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“…The volume was calculated by measuring dimensions of sample. The thermal conductivity and thermal effusivity were calculated using α*ρ* C p and ( k *ρ* C p ) 1/2 , respectively …”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Light‐weight thermal insulating fly ash cenosphere ceramics

Urunkar

Pandit

Bhargava

et al. 2018

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

show abstract

“…Abyzov et al [47] developed a composite material from particles of diamond in a copper matrix of good thermal and mechanical properties. Arizmendi-Morquecho et al [48] analyzed the high temperature behavior of recycled fly ash cenospheres which deposited thermal barrier coatings. Barshilia et al [49] found that the multi-functional ZnO coating was reliable for high temperature photothermal conversion applications.…”

Section: Introductionmentioning

confidence: 99%

Analytical solutions for three-dimensional steady and transient heat conduction problems of a double-layer plate with a local heat source

Jiang

Dai

2015

International Journal of Heat and Mass Transfer

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“…Estimation shows that the production of coal fly ash is about 500 million tonnes per year [1]. Even though global utilization of coal fly ash is estimated around 40 %, the disposal of large amounts of coal fly ash is still a prominent threat to the environment such as leaching of toxic substance into the ground [2] .…”

Section: Introductionmentioning

confidence: 99%

Production of Cenospheres from Coal Fly Ash through Vertical Thermal Flame (VTF) Process

Soh

Tan

Heng

et al. 2016

MSF

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Abstract.Coal fly ash is a complex mixture of anthropogenic materials produced during the combustion of pulverised coal in coal fired power plants. They pose environmental concerns that lead to air and water pollution. Effort has been done to reduce the production of coal fly ash or to extract potentially valuable products from coal fly ash, such as cenospheres. Cenospheres are light, low density, thin-walled hollow ceramic microsphere with unique properties. Conventional cenosphere production methods involve the separation of cenospheres from coal fly ash. Due to its small quantities in fly ash (1 % wt.), separation process results in low production of cenospheres. In this work, an attempt by applying a vertical thermal flame (VTF) process is done to produce cenospheres from coal fly ash. Particle size of coal fly ash 63 to 90 μm and 90 to 126 μm are selected to undergo the VTF process. Effect of size of precursor, number of passes through the thermal process, density, morphology and particles size of generated spheres are evaluated. The results show that different sizes of coal fly ash and number of passes through the VTF process affect the morphology of obtained spheres and the overall real density. Further optimization of the VTF process design in terms of heat source and the feeding mechanism are required to increase the transformation of coal fly ash to cenospheres.

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High temperature thermal barrier coatings from recycled fly ash cenospheres

Cited by 44 publications

References 12 publications

Light‐weight thermal insulating fly ash cenosphere ceramics

Light‐weight thermal insulating fly ash cenosphere ceramics

Analytical solutions for three-dimensional steady and transient heat conduction problems of a double-layer plate with a local heat source

Production of Cenospheres from Coal Fly Ash through Vertical Thermal Flame (VTF) Process

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