Preparation, microstructure, and thermophysical properties of Cr3+-modified cordierite high emissivity ceramic for metal thermal protection

2021 ◽  
pp. 162164
Author(s):  
Haipeng Zhang ◽  
Yaming Wang ◽  
Yanlin Hu ◽  
Wei Mao ◽  
Yongchun Zou ◽  
...  
Keyword(s):  
Thermophysical Properties ◽  
Thermal Protection ◽  
High Emissivity

Preparation of a flexible high emissivity coating on quartz fiber fabric for thermal protection

2017 ◽  
Vol 43 (16) ◽  
pp. 14292-14300 ◽  
Author(s):  
Xin Tao ◽  
Lingyu Zhang ◽  
Xiaohui Ma ◽  
Xiaojing Xu ◽  
Anran Guo ◽  
...  
Keyword(s):  
Thermal Protection ◽  
Quartz Fiber ◽  
Fiber Fabric ◽  
High Emissivity

Novel Concept of Advanced Thermal Protection Coating Based on Fullerenes

2001 ◽  
Author(s):  
Raouf O. Loutfy ◽  
Eugene M. Wexler
Keyword(s):  
Thermal Conductivity ◽  
Experimental Study ◽  
Elevated Temperatures ◽  
Thermal Protection ◽  
Temperature Decrease ◽  
Cold Surface ◽  
Novel Concept ◽  
Protection Coating ◽  
High Emissivity ◽  
Thermal Protection Coating

Abstract Experimental study has been carried out to investigate thermal protection properties of thin fullerene coatings subjected to external heating. It was shown that due to low thermal conductivity and high emissivity, micron-scale fullerene films were capable of withstanding elevated temperatures (up to 800°C) resulting in over 100°C temperature decrease on the “cold” surface of the underlying substrate. Based on obtained results, practically important recommendations are made.

Research of Thermophysical Properties of the Ultrathin Liquid Heat-Insulation

2018 ◽  
Vol 284 ◽  
pp. 1080-1085 ◽  
Author(s):  
O.V. Burlachenko ◽  
O.G. Chesnokova ◽  
T.F. Cherednichenko
Keyword(s):  
Thermal Properties ◽  
Thermophysical Properties ◽  
Thermal Protection ◽  
Heat Insulation ◽  
Outer Wall ◽  
Graphical Analysis ◽  
Average Temperature ◽  
Inner Surface ◽  
Liquid Heat ◽  
Bearing Part

The article highlights the results of the study of thermophysical properties of ultrathin liquid insulation when used to protect steel elements embedded in a multilayer outer wall. Conducted graphical analysis of the problem being solved. The results of temperature calculations with linear thermal properties showed that the unprotected insulation of steel embedded elements may freeze, and the formation of mold on the inner surface of the wall. The use of superfine heat insulation for thermal protection of mortgages of steel elements inside the construction of multilayer exterior walls gives a positive result. As a result of constructive solutions with the use of superfine thermal insulation can increase the average temperature of the inner bearing part of a wall of concrete. In addition, there is also a possibility to increase the temperature on the contact line between steel element with a load-bearing wall of concrete.

scholarly journals Heat Treatment Technology of Porous Building Materials with Predictability of Thermophysical Properties

2018 ◽  
Vol 7 (3.2) ◽  
pp. 501
Author(s):  
Mustafa Baba Babanli ◽  
Liubov Shumska ◽  
Maryna Leshchenko
Keyword(s):  
Heat Transfer ◽  
Heat Treatment ◽  
Porous Material ◽  
Thermophysical Properties ◽  
Building Materials ◽  
Process Development ◽  
Thermal Protection ◽  
Raw Material ◽  
Technological Parameters ◽  
Treatment Technology

The work is devoted to theoretical and experimental research of thermophysical features of the creation of new porous heat insulating materials, precisely: research of thermodynamic parameters of the heating processes, swelling and drying of materials; substantiation of the choice of the raw mixture method formation and determination of the optimal energy parameters of the swelling process; development of mathematical models of material heat treatment process and methods of basic technological parameters determination; development of advanced technologies for thermal protection of buildings and power equipment. Experimentally determined dependencies of technological parameters of heat treatment of the raw material mixture in the discharge, its composition, which allows obtaining material with minimal thermal conductivity. Also, the resulting dependencies ensure to find the required mode of heat treatment for the given thermophysical properties. The experimental setup has been developed, which provided to determine the basic laws of heat transfer of porous material, on the basis of which data were obtained, which allow to carry out an estimation of heat transfer and exchange characteristics of the new dispersed porous material necessary for technological calculations. A complex mathematical model of the heat energy mode of the building was created, as well as a program for solving the equations of this model, which makes it possible to determine the basic energy characteristics.  

Porous Structures and their Effect on Thermophysical Properties of Thermal Protection Elements

2019 ◽  
Vol 291 ◽  
pp. 20-27
Author(s):  
Anatolii Pavlenko ◽  
Andrii Cheilytko ◽  
Serhii Ilin Ilin ◽  
Hanna Koshlak
Keyword(s):  
Porous Structure ◽  
Thermophysical Properties ◽  
Thermal Protection ◽  
Spherical Shape ◽  
Experiment Planning ◽  
Thermophysical Characteristics ◽  
Moisture Evaporation ◽  
Thermal Insulating ◽  
Coefficient Of Thermal Conductivity ◽  
Laboratory Investigations

The improvement of the thermal insulating material thermophysical characteristics of the thermal protection elements by studying the porous structure is a promising direction of research. The article describes the effects of the porosity and coupling of the porous structure on the thermophysical characteristics of thermal insulating materials. The article uses standard systematized techniques and instruments of scientific research applied in thermophysics. The research methodology of highly-porous material thermophysical properties is based on performance of empirical laboratory investigations of the samples obtained. It was found that for the pore structure effect on the material characteristics it is rational to use the following complex indices: porosity, number of pores, pore position in space, the pore form, pore formation energy. The article shows the effect of the porous structure on the thermophysical characteristics of the material. The complex parameters of the porous structure, which will allow to develop a new method of control of the porous structure, are proposed. As a result of the experiment planning method, the regression equation of an effective coefficient of thermal conductivity for porous thermal protection structures was developed. It was established that for a more even distribution of the mixture in a volume it is necessary to minimize the size of the dispersed components, thereby increasing the area of their contacts. The experimental method revealed that the moisture evaporation caused the formation of pores inside the clay. The shape of the pores was determined using electron microscope MMP-2P, both on the sample section and surface. The clearest clay has the greatest porosity (no iron oxide and calcium oxide). The pores have a spherical shape in it. The presence of impurities reduces the material porosity due to the increased clay viscosity.

Simplification and Improvement of the Efficiency of Testing Thermophysical Properties of Facade Composite Materials

2022 ◽  
Vol 906 ◽  
pp. 77-83
Author(s):  
Anna Karamyan ◽  
Karen Movsesyan ◽  
Tigran Manukyan
Keyword(s):  
Composite Materials ◽  
Thermophysical Properties ◽  
Energy Demand ◽  
Thermal Protection ◽  
Efficiency Index ◽  
New Approach ◽  
Effective Factor ◽  
Building Facades ◽  
U Value ◽  
The Relationship

The choice of highly efficient materials for the opaque parts of the building facades is the most effective factor in increasing its thermal protection. A decrease in the coefficient of U-value of opaque parts of a building directly affects the consumption of both thermal energy and the energy demand for cooling. Two-component or multi-component composite materials today occupy a large place in modern construction. This article analyzes the methodology for testing the thermophysical properties of these materials, reveals a new approach to determine to it, taking into account the links between the thermal conductivity and the thermal diffusivity of materials. The article analyzes the relationship between buildings and the surfaces of the outer envelope and the dependence of the energy efficiency index of the building.

scholarly journals Study of thermal conductivity coefficient of basalt fiber insulation at various temperature conditions

Vestnik IGEU ◽  
2021 ◽  
pp. 15-24
Author(s):  
E.R. Bazukova ◽  
Yu.V. Vankov ◽  
S.O. Gaponenko ◽  
N.N. Smirnov
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Thermophysical Properties ◽  
Thermal Conductivity Coefficient ◽  
Thermal Protection ◽  
Operating Temperature ◽  
Basalt Fiber ◽  
Electric Heater ◽  
Insulating Materials ◽  
Temperature Conditions

Industrial thermal insulation fibrous materials (mineral wool and fiberglass products) are mainly used for thermal protection of the systems transporting high-temperature heat carriers. The data known in the scientific literature about the effect of insulation density and operating temperature conditions on the thermophysical properties of materials made of basalt fiber differ significantly. Taking these data into account let us improve the accuracy of thermal calculations and the validity of design solutions for thermal protection of industrial networks up to 60 %. The aim of the study is to obtain data on the change of the heat-shielding properties of insulating materials made of basalt fiber of various densities, depending on the temperature conditions of operation. An experimental study of the thermophysical properties of several samples of basalt fiber insulation has been carried out on a laboratory bench. The density of a constant heat flux passing through the sample has been determined by the additional wall method. The experimental unit consists of a cylindrical metal tube with a built-in electric heater, on the top of which a heat-insulating basalt fiber of various densities is placed. The temperature on the pipe surface is changed in the range from 50 to 350 оC. The dependence of the thermal conductivity coefficient of thermal insulation basalt fiber samples on its density and operating temperature of the material is obtained. The research results show that thermal conductivity coefficient of basalt fiber insulation increases with temperature increase of the pipeline surface. The lower the value of the material density is, the higher the increment of the thermal conductivity coefficient is. The obtained results enrich the data about the dependence of the thermal conductivity of fibrous heat-insulating materials on density and temperature (for cases of operation at high temperatures). Considering the density of the examined materials made of basalt fiber when determining the thermal conductivity makes it possible to increase the accuracy of calculations up to 20 % and temperature modes of operation up to 60 %. The results obtained can be applied to find the thickness of the thermal insulation of pipelines and heat losses in the networks.

Evaluation of a Modified Fused Filament Fabrication Material for Use As Thermal Protection

2019 ◽  
Author(s):  
Steven Kim ◽  
Alexa Devega ◽  
Mallory Sico ◽  
Hao Wu ◽  
William Fahy ◽  
...  
Keyword(s):  
Thermal Protection ◽  
Fused Filament Fabrication
Sign in / Sign up

Export Citation Format

Share Document