scholarly journals Investigation of Thermal Behavior of 3D PET Knits with Different Bioceramic Additives

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1319
Author(s):  
Audronė Sankauskaitė ◽  
Vitalija Rubežienė ◽  
Diana Kubilienė ◽  
Aušra Abraitienė ◽  
Julija Baltušnikaitė-Guzaitienė ◽  
...  
Keyword(s):  
Thermal Behavior ◽  
Far Infrared ◽  
Ceramic Materials ◽  
High Heat ◽  
Heat Accumulation ◽  
Sem Images ◽  
Coating Methods ◽  
Coated Fabrics ◽  
Ceramic Compounds ◽  
3D Pet

The purpose of this study is to investigate the thermoregulatory properties of polyethylene terephthalate (PET) 3D knitted materials with bioceramic additives which are highly absorbing far-infrared (FIR) radiation. Ceramic materials are well-known and useful for thermal insulation applications. In order to compare different types of ceramic additives and coating methods for their incorporation into textile, several types of ceramic compounds with heat-retaining function were selected: germanium (Ge), aluminum (Al) and silicon (Si) additives were applied by impregnation in squeezing padder and titanium (Ti) by the screen printing method. The thermoregulatory properties (thermal resistance, heat-retaining effectiveness and air permeability) of 3D PET knits with bioceramic additives were estimated. In this study scanning electron microscopy (SEM) images were used to analyze the morphology of coated fabrics, X-ray fluorescence spectroscopy (XRF) analysis was applied to evaluate the number of minerals with high heat capacity in each formulation used for treatment. The knits coated with a formulation containing Ti ceramic additives demonstrated the most effective thermal behavior. Furthermore, better heat accumulation effectiveness of Ti ceramics containing knits was confirmed by Fourier transform infrared spectroscopy (FTIR) analysis. It was also determined that 3D knitted fabric with Ti ceramic additives showed the highest emissivity among tested samples and the implication is that this sample radiates its energy more efficiently than others.

Analytical and High-Resolution EM Study of Crystalline Phases formed at Metal-Ceramic Interface

1990 ◽  
Vol 48 (2) ◽  
pp. 426-427
Author(s):  
N. Merk ◽  
A. P. Tomsia ◽  
G. Thomas
Keyword(s):  
Cross Section ◽  
Dissimilar Materials ◽  
Ceramic Materials ◽  
Electron Micrograph ◽  
Scanning Electron Micrograph ◽  
Structural Applications ◽  
Metal Ceramic ◽  
The Subject ◽  
Ceramic Compounds ◽  
Scanning Electron

A recent development of new ceramic materials for structural applications involves the joining of ceramic compounds to metals. Due to the wetting problem, an interlayer material (brazing alloy) is generally used to achieve the bonding. The nature of the interfaces between such dissimilar materials is the subject of intensive studies and is of utmost importance to obtain a controlled microstructure at the discontinuities to satisfy the demanding properties for engineering applications . The brazing alloy is generally ductile and hence, does not readily fracture. It must also wett the ceramic with similar thermal expansion coefficient to avoid large stresses at joints. In the present work we study mullite-molybdenum composites using a brazing alloy for the weldment.A scanning electron micrograph from the cross section of the joining sequence studied here is presented in Fig. 1.

scholarly journals Thermal behavior (TG-DTA-TMA), sintering and properties of a kaolinitic clay from Buenos Aires Province, Argentina

Cerâmica ◽  
2019 ◽  
Vol 65 (374) ◽  
pp. 227-235
Author(s):  
M. S. Conconi ◽  
M. Morosi ◽  
J. Maggi ◽  
P. E. Zalba ◽  
F. Cravero ◽  
...  
Keyword(s):  
Thermal Behavior ◽  
Microstructural Characterization ◽  
Ceramic Materials ◽  
Xrd Analysis ◽  
Sintering Behavior ◽  
Buenos Aires Province ◽  
Mineralogical Characterization ◽  
Processing Strategies ◽  
Basement Rocks ◽  
Kaolinitic Clay

Abstract The technological properties of a local kaolin, considered as a potential industrial material, were correlated with the thermal behavior and sintering processes carried out through a series of thermochemical analyses. The chemical and mineralogical characterization of the material was carried out, together with a simple microstructural characterization. The used material corresponded to the kaolinized basement rocks (saprolite zone) mined at La Verónica quarry, Chillar area, Azul County, Argentina. The complete kaolinite-metakaolinite-spinel-mullite thermal series was characterized. Sintering behavior was studied; a viscous phase sintering mechanism was proposed. Apparent density and porosity of fired ceramics were measured. A light-firing color was confirmed by colorimetry. The viscous phase mechanism was possibly described thanks to the multi-technique thermal behavior analysis complemented by XRD analysis. These results permitted to establish formulation and processing strategies of ceramic materials based on the studied clay. The possible applications include: tile manufacturing, sanitary ware, tableware, kaolinitic proppants, chamotte and refractory materials.

scholarly journals The influence of the nature and textural properties of different supports on the thermal behavior of Keggin type heteropolyacids

2006 ◽  
Vol 71 (3) ◽  
pp. 235-249 ◽  
Author(s):  
Alexandru Popa ◽  
Viorel Sasca ◽  
Mircea Stefanescu ◽  
Erne Kis ◽  
Radmila Marinkovic-Neducin
Keyword(s):  
Thermal Stability ◽  
Thermal Decomposition ◽  
Thermal Behavior ◽  
Solid Phase ◽  
Textural Properties ◽  
Nitrogen Adsorption ◽  
Active Phase ◽  
Support Surface ◽  
Sem Images ◽  
The Stability

In order to obtain highly dispersed heteropolyacids (HPAs) species, H3PMo12O40 and H4PVMo11O40 were supported on various supports: silica (Aerosil - Degussa and Romsil types) and TiO2. The structure and thermal decomposition of supported and unsupported HPAs were followed by different techniques (TGA-DTA, FTIR, XRD, low temperature nitrogen adsorption, scanning electron microscopy). All the supported HPAs were prepared by impregnation using the incipient wetness technique with a 1:1 mixture of water-ethanol. Samples were prepared with different concentrations to examine the effect of loading on the thermal behavior of the supported acid catalysts. The thermal stability was evaluated with reference to the bulk solid acids and mechanical mixtures. After deposition on silica types supports, an important decrease in thermal stability was observed on the Romsil types and a small decrease on the Aerosil type. The stability of the heteropolyacids supported on titania increased due to an anion-support interaction, as the thermal decomposition proceeded in two steps. The structure of the HPAs was not totally destroyed at 450 ?C as some IR bands were still preserved. A relatively uniform distribution of HPAs on the support surface was observed for all compositions of the active phase. No separate crystallites of solid phase HPAs were found in the SEM images.

scholarly journals Effect of Magnesium Borates on the Fire-Retarding Properties of Zinc Borates

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Azmi Seyhun Kipcak ◽  
Nil Baran Acarali ◽  
Emek Moroydor Derun ◽  
Nurcan Tugrul ◽  
Sabriye Piskin
Keyword(s):  
Raw Materials ◽  
High Strength ◽  
High Heat ◽  
Zinc Borate ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Magnesium Borate ◽  
Sem Images ◽  
Ir And Raman Spectroscopies ◽  
Coefficient Of Elasticity

Magnesium borate (MB) is a technical ceramic exhibiting high heat resistance, corrosion resistance, great mechanical strength, great insulation properties, lightweightness, high strength, and a high coefficient of elasticity. Zinc borate (ZB) can be used as a multifunctional synergistic additive in addition to flame retardant additives in polymers. In this study, the raw materials of zinc oxide (ZnO), magnesium oxide (MgO), and boric acid (H3BO3) were used in the mole ratio of 1 : 1 : 9, which was obtained from preexperiments. Using the starting materials, hydrothermal synthesis was applied, and characterisation of the products was performed using X-Ray diffraction (XRD) and Fourier transform infrared (FT-IR) and Raman spectroscopies. The forms of Zn3B6O12·3.5H2O, MgO(B2O3)3·7(H2O), and Mg2(B6O7(OH)6)2·9(H2O) were synthesised successfully. Moreover, the surface morphology was investigated using scanning electron microscopy (SEM), and the B2O3content was determined. In addition, the reaction yields were calculated. The results of the B2O3content analysis were in compliance with the literature values. Examination of the SEM images indicated that the obtained nanoscale minerals had a reaction efficiency ranging between 63–74% for MB and 87–98% for ZB. Finally, the fire-retarding properties of the synthesised pure MBs, pure ZBs, and mixtures of MB and ZB were determined using differential thermal analysis and thermal gravimetry (DTA-TG) and differential scanning calorimetry (DSC).

Synthesis and Characterization of Hexagonal Boron Nitride Nanosheets

2013 ◽  
Vol 274 ◽  
pp. 411-414 ◽  
Author(s):  
Chao Guo ◽  
Li Min Dong ◽  
Shi Jun Gong ◽  
Chun Yu Miao ◽  
Xian You Zhang
Keyword(s):  
Boron Nitride ◽  
Solid Phase ◽  
Hexagonal Boron Nitride ◽  
Infrared Absorption Spectrum ◽  
Far Infrared ◽  
Hybrid Structure ◽  
Sem Images ◽  
Boron Nitride Nanosheets ◽  
Visible Luminescence

In this article, hexagonal boron nitride nanosheets have been successfully synthesized by the method of solid-phase sintering using boron oxide (B2O3) and sodium azides (NaN3) as the reactants and magnesium powder as catalyst at 450 °C. Results from XRD suggest that the synthesized products be indexed as pure h-BN. The surface morphology of the products was observed by the scanning electron microscope, that the products are constituted of a large number of the structure of nanosheets. And the SEM images show the sheetlike materials with a diameter of about 500-900 nm, and the thickness is about 100 nm. The far-infrared absorption spectrum showed that the typical sp2 hybrid structure of hexagonal boron nitride. The optical properties of the product are observed in the PL spectra, which shows that the prepared BN emits strong visible luminescence at 445 nm (λex = 325 nm).

Far IR Emission and Thermal Properties of Ceramics Coated Fabrics by IR Thermography

2006 ◽  
Vol 321-323 ◽  
pp. 849-852 ◽  
Author(s):  
Chung Hee Park ◽  
Myoung Hee Shim ◽  
Huen Sup Shim
Keyword(s):  
Far Infrared ◽  
The Body ◽  
Thermal Manikin ◽  
Evaporative Resistance ◽  
Clothing Insulation ◽  
Ir Camera ◽  
Warm Up ◽  
Coated Fabrics ◽  
Ir Emission ◽  
Body Heat

The purpose of this study was to develop the warm-up suit that is comfortable as well as has good thermal performance. The function of warm-up suit is to keep the body warm and thus to lose it’s weight by sweating. Ceramic powders, such as zirconium and magnesium oxide have been incorporated into the textile structures to utilize the far infrared radiation effect of ceramics, which heat substrates homogeneously by activating molecular motion. Thermal manikin tests were conducted to determine the clothing insulation and evaporative resistance of the selected warm-up suits. Also, the far IR emission effects of ceramics containing laminate on the body heat transfer were evaluated with the thermogram data using IR camera. The results showed that the ceramics inside laminate slightly increased the thermal insulation and the evaporative resistance. Thermogram showed that when the fabric was heated with the thermal manikin, surface mean temperatures of fabrics were increased as the ceramic incorporated, and the heat storage performance was confirmed.

Research on the Selection of Materials as Oil and Water Separating Membrane for Underwater Oil Tanks

2013 ◽  
Vol 664 ◽  
pp. 996-1001
Author(s):  
Yu Guang Cao ◽  
Song Sen Xu ◽  
Shi Hua Zhang
Keyword(s):  
Glass Fiber ◽  
Sea Water ◽  
Test Results ◽  
Wave Pressure ◽  
Water Replacement ◽  
Coating Methods ◽  
Coated Fabrics ◽  
Coating Agents ◽  
Oil Tanks ◽  
Selection Of

In order to decrease the pollution to sea water during the course of oil and water replacement, oil and water separating membrane will be adopted. Considering the expansion and contraction of oil and water separating membrane, transmission of wave pressure and the density difference between the oil and water, the membrane may be damaged by tension, buckling, friction, scraping and so on. Thus, the material used as oil and water separating membrane should have enough strength and flexibility. The generally used coating fabrics were discussed in this paper as per the coating agents, base cloths, and coating methods. Glass fiber cloth coated with silica gel and polyurethane coated fabrics were chosen and a series of tests were performed as per the corresponding standards. By analyzing the test results, the preferred material for oil and water separating membrane was proposed.

scholarly journals Effects of Far‐Infrared Emitting Ceramic Material Clothing on Recovery After Maximal Eccentric Exercise

2019 ◽  
Vol 70 (1) ◽  
pp. 135-144
Author(s):  
Renan Felipe Hartmann Nunes ◽  
Naiandra Dittrich ◽  
Rob Duffield ◽  
Marília Cavalcante Serpa ◽  
Tiago Martins Coelho ◽  
...  
Keyword(s):  
Creatine Kinase ◽  
Lactate Dehydrogenase ◽  
Muscle Damage ◽  
Eccentric Exercise ◽  
Muscle Soreness ◽  
Far Infrared ◽  
Ceramic Materials ◽  
Voluntary Contraction ◽  
Delayed Onset Muscle Soreness ◽  
Delayed Onset

Abstract The purpose of this study was to determine whether Far-Infrared Emitting Ceramic Materials worn as Bioceramic pants would improve neuromuscular performance, biochemical and perceptual markers in healthy individuals after maximal eccentric exercise. Twenty-two moderately active men were randomized into Bioceramic (n = 11) or Placebo (n = 11) groups. To induce muscle damage, three sets of 30 maximal isokinetic eccentric contractions of the quadriceps were performed at 60°·s-1. Participants wore the bioceramic or placebo pants for 2 hours immediately following the protocol, and then again for 2 hours prior to each subsequent testing session at 24, 48 and 72 hours post. Plasma creatine kinase and lactate dehydrogenase activity, delayed-onset muscle soreness, perceived recovery status, and maximal voluntary contraction were measured pre-exercise and 2, 24, 48, and 72 hours post-exercise. Eccentric exercise induced muscle damage as evident in significant increases in delayed-onset muscle soreness at 24 - 72 hours (p < 0.05) and creatine kinase between Pre to 2, 24, 48 and 72 hours (p < 0.05). Despite the increased delayed-onset muscle soreness and creatine kinase values, no effect of Bioceramic was evident (p > 0.05). Furthermore, decreases in maximal voluntary contraction between Pre and immediately, 2, 24, 48 and 72 hours post (p < 0.05) were reported. However, the standardized difference was moderate lower for lactate dehydrogenase at 24 h (ES = 0.50), but higher at 48 h (ES = -0.58) in the Bioceramic compared to the Placebo group. Despite inducing muscle damage, the daily use of Far-Infrared Emitting Ceramic Materials clothing over 72 hours did not facilitate recovery after maximal eccentric exercise.

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