Effect of Different Firing Temperature on Thermal Conductivity of Ceramic Tiles

2020 ◽  
Vol 1010 ◽  
pp. 665-671
Author(s):  
Khairul Anuar Shariff ◽  
Muhammad Syahir Juhari ◽  
Lynette Wei Ling Chan ◽  
Shah Rizal Kasim
Keyword(s):  
Thermal Conductivity ◽  
Firing Temperature ◽  
The Body ◽  
Thermal Constant ◽  
High Porosity ◽  
Ceramic Tiles ◽  
Tile Body ◽  
Trapped Air ◽  
Hot Disk ◽  
Body Formulation

The aim of this study is to investigate the effect of different firing temperature on thermal conductivity of ceramic tiles. The body formulation powders of ceramic tiles were made according to the formulation given by company and compacted at 18 MPa using pressing machine in order to obtain button shape specimen with 50 mm diameter. The button shape specimen was fired at different firing temperature which 1150°C, 1175°C, 1200°C and 1225°C. Then, the thermal conductivity of fired specimens was measured by using Hot-Disk Thermal Constant Analyzer. Thermal conductivity result shows that the ceramic tile body fired at 1150 °C producing the lowest thermal conductivity values (0.97 W/mK) in comparison with other specimens. This low thermal conductivity performance is due to the high porosity value in the specimen as a result of more trapped air and implies delaying the heat transfer either inward or outward from the ceramic tiles. Therefore, this study proved that by altering firing temperature, different thermal conductivity values of ceramic tiles were obtained.

Study on Effect of Lattice Distortion on Infrared Properties of Ceramic Tiles at Ambient Temperature

2011 ◽  
Vol 243-249 ◽  
pp. 5794-5797
Author(s):  
Xing Yong Gu ◽  
Ting Luo ◽  
Yu Xia Chen
Keyword(s):  
Solid Solution ◽  
Ambient Temperature ◽  
Firing Temperature ◽  
Lattice Distortion ◽  
Raw Materials ◽  
The Body ◽  
Infrared Emissivity ◽  
Ceramic Tiles ◽  
Elemental Impurities ◽  
Firing Schedule

Effect of the lattice distortion of the main crystal mullite, addition of copper mine tailing and the firing schedule on the infrared properties were studied. The study revealed that the higher lattice distortion is, the higher infrared emissivity of ceramic tiles is. The addition of raw materials containing iron and other elemental impurities could form the solid solution in the body what promote the degree of lattice distortion of main crystal which affects the infrared emissivity of the ceramic tiles. With the increasing of firing temperature, the degree of lattice distortion of main crystals will decrease and the infrared properties also decrease.

scholarly journals Study of Ultrasonic Attenuation and Thermal Conduction in Bimetallic Au/Pt Nanofluids

2020 ◽  
Author(s):  
Alok Kumar Verma ◽  
Navneet Yadav ◽  
Shakti Pratap Singh ◽  
Kajal Kumar Dey ◽  
Devraj Singh ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Thermal Conduction ◽  
Base Fluid ◽  
Ultrasonic Attenuation ◽  
Thermal Constant ◽  
Absorption Feature ◽  
Two Phase ◽  
Mechanistic Approach ◽  
Hot Disk

Here, we report the frequency dependent ultrasonic attenuation of monometallic Au and bimetallic Au/Pt based aqueous nanofluids (NFs). The as synthesized bimetallic nanofluids (BMNFs) revealed less resistance to ultrasonic wave compared to the monoatomic NFs. Thermal conductivity of both nanofluids taken at different concentrations, measured by the Hot Disk Thermal Constant Analyzer (TPS-500) revealed substantial conductivity improvement when compared to the base fluid, although Au/Pt showed lesser improvement compared to Au. We rationalized our obtained results with thorough characterization of the as synthesized nanoparticles/fluids with techniques such as XRD, UV-Vis, TEM, EDS etc. and some of the important information revealed were about the distinct two-phase bimetallic nature of Au/Pt, its two plasmonic band optical absorption feature and the spherical morphology of the particles. The findings were correlated with the observed thermal and ultrasonic behaviour and proper rationalization was provided. It was revealed that the comparatively lesser thermal conductivity of Au/Pt had direct implication on its attenuation property. The findings could have important repercussions in both industrial applicational aspects and mechanistic approach towards the field of ultrasonic attenuation in nanofluids

scholarly journals The Equivalent Thermal Conductivity of the Micro/Nano Scaled Periodic Cubic Frame Silver and Its Thermal Radiation Mechanism Analysis

Energies ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4158
Author(s):  
Haiyan Yu ◽  
Haochun Zhang ◽  
Heming Wang ◽  
Dong Zhang
Keyword(s):  
Thermal Conductivity ◽  
Thermal Radiation ◽  
Cell Size ◽  
Near Infrared ◽  
High Porosity ◽  
Mechanism Analysis ◽  
Infrared Band ◽  
Spectral Radiation ◽  
Radiation Mechanism ◽  
Equivalent Thermal Conductivity

Currently, there are few studies on the influence of microscale thermal radiation on the equivalent thermal conductivity of microscale porous metal. Therefore, this paper calculated the equivalent thermal conductivity of high-porosity periodic cubic silver frame structures with cell size from 100 nm to 100 µm by using the microscale radiation method. Then, the media radiation characteristics, absorptivity, reflectivity and transmissivity were discussed to explain the phenomenon of the radiative thermal conductivity changes. Furthermore, combined with spectral radiation properties at the different cross-sections and wavelength, the radiative transmission mechanism inside high-porosity periodic cubic frame silver structures was obtained. The results showed that the smaller the cell size, the greater radiative contribution in total equivalent thermal conductivity. Periodic cubic silver frames fluctuate more in the visible band and have better thermal radiation modulation properties in the near infrared band, which is formed by the Surface Plasmon Polariton and Magnetic Polaritons resonance jointly. This work provides design guidance for the application of this kind of periodic microporous metal in the field of thermal utilization and management.

scholarly journals Thermal insulation properties of green vacuum insulation panel using wood fiber as core material

BioResources ◽  
2019 ◽  
Vol 14 (2) ◽  
pp. 3339-3351 ◽  
Author(s):  
Baowen Wang ◽  
Zhihui Li ◽  
Xinglai Qi ◽  
Nairong Chen ◽  
Qinzhi Zeng ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Bulk Density ◽  
Thermal Insulation ◽  
Wood Fiber ◽  
Core Material ◽  
High Porosity ◽  
Total Thermal Conductivity ◽  
Wood Fibers ◽  
Vacuum Insulation ◽  
Vacuum Insulation Panel

Wood fibers were prepared as core materials for a vacuum insulation panel (VIP) via a dry molding process. The morphology of the wood fibers and the microstructure, pore structure, transmittance, and thermal conductivity of the wood fiber VIP were tested. The results showed that the wood fibers had excellent thermal insulation properties and formed a porous structure by interweaving with one another. The optimum bulk density that led to a low-cost and highly thermally efficient wood fiber VIP was 180 kg/m3 to 200 kg/m3. The bulk density of the wood fiber VIP was 200 kg/m3, with a high porosity of 78%, a fine pore size of 112.8 μm, and a total pore volume of 7.0 cm3·g-1. The initial total thermal conductivity of the wood fiber VIP was 9.4 mW/(m·K) at 25 °C. The thermal conductivity of the VIP increased with increasing ambient temperature. These results were relatively good compared to the thermal insulation performance of current biomass VIPs, so the use of wood fiber as a VIP core material has broad application prospects.

scholarly journals Hygrothermal simulation of building performance: data for Scottish masonry materials

2021 ◽  
Vol 54 (4) ◽  
Author(s):  
P. F. G. Banfill
Keyword(s):  
Thermal Conductivity ◽  
Water Vapour ◽  
Material Properties ◽  
Simulation Software ◽  
Water Vapour Permeability ◽  
High Porosity ◽  
Water Absorption Coefficient ◽  
Vapour Permeability ◽  
Hygrothermal Simulation ◽  
Current Production

AbstractRetrofitting thermal insulation to solid masonry walls alters their hygrothermal behaviour, which can be modelled by hygrothermal simulation software. However, such software needs values of key material properties to ensure satisfactory results and until now data has not been available for Scottish masonry buildings. This work aims to contribute to a Scotland-specific dataset of material properties for use by designers working on such buildings. Thermal conductivity, water vapour permeability, sorptivity, water absorption coefficient, hygroscopic sorption, density and porosity were all determined experimentally for selected historic and contemporary masonry materials. Within the range of materials tested three groups of materials properties emerge. Natural hydraulic lime mortars, hot-mixed quicklime mortar and earth mortar all show comparatively low density, high porosity, low thermal conductivity, high water vapour permeability and variable but generally high hygroscopic sorption. Craigleith, Hailes and Giffnock sandstones, no longer available but obtained from conservation works on historic buildings, and Locharbriggs and Hazeldean sandstones, obtained from current production, all show intermediate values of these properties. Crathes granodiorite and Scottish whinstone (from current production) show high density, low porosity, high thermal conductivity, low water vapour permeability and low hygroscopic sorption. It is shown that these materials are all relevant to Scottish buildings constructed in traditional masonry and this paper presents the first comprehensive set of hygrothermal property data for them.

scholarly journals Fabrication of cellulose-based aerogel for thermal and acoustic insulation applications

2021 ◽  
Vol 947 (1) ◽  
pp. 012030
Author(s):  
Ngan N T Thai ◽  
Quyen N D Chau ◽  
Nam D Do ◽  
Tuan D Tran ◽  
Ha K P Huynh ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Sound Absorption ◽  
Young Modulus ◽  
High Porosity ◽  
Water Contact ◽  
Acoustic Insulation ◽  
Conductivity Water ◽  
Oil Adsorption ◽  
High Sound ◽  
Absorption Measurements

Abstract A method to prepare aerogels from rice straw and polyvinyl alcohol in the presence of fiberglass and glutaraldehyde is herein reported. The morphology, pore structure and physical properties of the aerogels were characterized by scanning electron microscopy (SEM), thermogravimetric analysis (TGA), thermal conductivity, water contact angle (WCA) measurements, oil adsorption and sound absorption measurements. The obtained aerogels should be considered as a promising material for upcoming applications, since it has high porosity (up to 93.72%), low density (0.083-0.127 g/cm3), super low thermal conductivity (0.032-0.048 W/mK), high Young modulus (0.201-1.207 MPa), high sound absorption (absorption coefficient of 0.87) and a good oil adsorption capacity (4.8 g/g).

scholarly journals Coupling characteristics of meso-structure and thermophysical parameters of deep granite under high geo-temperature

2021 ◽  
Vol 25 (6 Part B) ◽  
pp. 4621-4629
Author(s):  
Huan Wang ◽  
Shuang You ◽  
Hong-Guang Ji ◽  
Hui-Ci Xu ◽  
Qi Li ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Heat Capacity ◽  
Specific Heat ◽  
Specific Heat Capacity ◽  
Thermal Constant ◽  
Structure Characteristics ◽  
Thermophysical Parameters ◽  
Before And After ◽  
Coupling Characteristics ◽  
Granite Samples

Polarizing microscope, nuclear magnetic resonance, and thermal constant analyzer were used to test the granite samples in the depth of 1500-2000 m in San?shandao before and after the heat treatment and be carried out to study the cor?responding relationship between rock meso-structure characteristics and different geothermal temperature circumstances, and the influence of thermal cycling on rock meso-structure. Tests results present that the porosity, pore size distribution, thermal conductivity and specific heat capacity are significantly affected by the environment where the rock occurs, mineral composition and particle size, and the increase in porosity and water content will cause the thermal conductivity and specific heat capacity to decrease.

Sign in / Sign up

Export Citation Format

Share Document