Analysis of SF6 Solid Decomposition Products after Breaking Tests

2019 ◽  
Author(s):  
Xiao Wang ◽  
Yuyou Long ◽  
Shixin Xiu ◽  
Zepeng Chen ◽  
Zhiheng Sun
Keyword(s):  
Decomposition Products ◽  
Solid Decomposition

Effect of the partial pressure of water vapour on the thermal decomposition of γ-FeOOH and on the dispersity of the solid decomposition products

1984 ◽  
Vol 19 (1) ◽  
pp. 183-188 ◽  
Author(s):  
D. G. Klissurski ◽  
J. Šubrt ◽  
V. N. Blaskov ◽  
J. Lipka ◽  
P. Hanousek ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Partial Pressure ◽  
Water Vapour ◽  
Decomposition Products ◽  
Solid Decomposition

scholarly journals Synthesis, Polymorphism and Thermal Decomposition Process of (n-C4H9)4NRE(BH4)4 for RE = Ho, Tm and Yb

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1329
Author(s):  
Wojciech Wegner ◽  
Tomasz Jaroń
Keyword(s):  
Thermal Decomposition ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Decomposition Products ◽  
Gaseous Products ◽  
Dsc Measurements ◽  
Unit Cells ◽  
Polymorphic Forms ◽  
Solid Decomposition ◽  
Derivatives Of

In total, three novel organic derivatives of lanthanide borohydrides, n-But4NRE(BH4)4 (TBAREB), RE = Ho, Tm, Yb, have been prepared utilizing mechanochemical synthesis and purified via solvent extraction. Studies by single crystal and powder X-ray diffraction (SC-XRD and PXRD) revealed that they crystalize in two polymorphic forms, α- and β-TBAREB, adopting monoclinic (P21/c) and orthorhombic (Pnna) unit cells, previously found in TBAYB and TBAScB, respectively. Thermal decomposition of these compounds has been investigated using thermogravimetric analysis and differential scanning calorimetry (TGA/DSC) measurements, along with the analysis of the gaseous products with mass spectrometry (MS) and with analysis of the solid decomposition products with PXRD. TBAHoB and TBAYbB melt around 75 °C, which renders them new ionic liquids with relatively low melting points among borohydrides.

scholarly journals A Synergistic Flame Retardant System Based on Expandable Graphite, Aluminum (Diethyl-)Polyphospinate and Melamine Polyphosphate for Polyamide 6

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2712
Author(s):  
Florian Tomiak ◽  
Angelina Schoeffel ◽  
Klaus Rathberger ◽  
Dietmar Drummer
Keyword(s):  
Flame Retardant ◽  
Expanded Graphite ◽  
Polyamide 6 ◽  
Partial Substitution ◽  
Expandable Graphite ◽  
Heating Rates ◽  
Sem Images ◽  
Decomposition Products ◽  
Solid Decomposition ◽  
Synergistic Flame Retardant

Expandable graphite (EG), aluminum (diethyl)polyphosphinate (AlPi) and melamine polyphophate (MPP) was used as flame retardant multi-material additive in a polyamide 6 (PA6) matrix. Flame inhabitation performances were conducted by cone calorimeter, LOI and UL-94 tests, synergisms identified analyzed by TGA-FTIR and TGA-GC/MS and effects found were comprehensively discussed. SEM images were used for char residue characterization. For PA6 containing 20 wt.% EG and 5 wt.% AlPi/MPP (3:2), a well working synergism in limiting oxygen indices could be identified exhibiting the highest oxygen index (OI) measured: 46%. The study shows that the synergism due to the partial substitution of EG by AlPi/MPP can be attributed to two effects: (1) When PA6/AlPi/MPP mixtures decompose predominantly CO2 evaporates in early decomposition stages. CO2 evaporations was found to be sensitive to the heating rate applied, whereas specifically high heating rates increased the CO2 yield measured. (2) Solid decomposition products of AlPi/MPP act as “glue” between expanded graphite and thus increase the mechanical residue stability.

THE DEHYDRATION OF TRICALCIUM ALUMINATE HEXAHYDRATE

1941 ◽  
Vol 19b (5) ◽  
pp. 123-128 ◽  
Author(s):  
W. G. Schneider ◽  
T. Thorvaldson
Keyword(s):  
Calcium Oxide ◽  
Low Temperatures ◽  
Slow Rate ◽  
Decomposition Products ◽  
Prolonged Heating ◽  
Dry Air ◽  
Tricalcium Aluminate ◽  
Composition Formula ◽  
Solid Decomposition ◽  
A Current

Samples of the isotropic hexahydrate of tricalcium aluminate were dehydrated in a current of dry air at various temperatures up to 1050°. The water retained and the lime liberated were determined. The results of earlier preliminary studies in this laboratory were confirmed. At low temperatures an isotropic hydrate of the composition [Formula: see text], having a refractive index of 1.543 ± 0.003, is formed. This hydrate is stable in dry air up to a temperature of approximately 275° and when once formed at lower temperatures has a very slow rate of decomposition below 350°. On continued dehydration above 275° decomposition occurs with the liberation of calcium oxide. Between 550° and 950° quantitative decomposition occurs into calcium oxide and an aluminate of the composition 12CaO∙7Al2O3. In the upper part of this temperature range prolonged heating causes slow recombination of the solid decomposition products, and above 950° this effect becomes marked. Dehydration of the hexahydrate in a current of dry nitrogen gives similar results. The experiments indicate that the system [Formula: see text] would serve as an efficient drying agent at temperatures below 100°.

scholarly journals Analysis of Suspended Potential Discharge Defects by SF6 Decomposition Products

2021 ◽  
Vol 898 (1) ◽  
pp. 012009
Author(s):  
Lijun Fu ◽  
Yanling Guan ◽  
Liang Zhang ◽  
Jian Zhang
Keyword(s):  
Reaction Mechanism ◽  
Decomposition Product ◽  
Circuit Breaker ◽  
Normal Operation ◽  
Forming Process ◽  
Decomposition Products ◽  
Iron Aluminum ◽  
Column Type ◽  
Sf6 Decomposition ◽  
Solid Decomposition

Abstract The type and content of SF6 decomposition products are directly related to the type, location and degree of fault. Based on the analysis of the abnormal SF6 gas decomposition product content and discharge type of 126kV Porcelain Column type circuit breaker, the potential fault of the circuit breaker is judged to be suspension potential discharge fault. After disassembling the circuit breaker, it is found that the abnormal phase of the insulation rod is deformed, the pin become thin, and there are solid decomposition products, the sulfides and fluoride, which are mainly composed of iron, aluminum, chromium and manganese, further confirm that the potential fault of the circuit breaker is suspension potential discharge fault. The forming process and reaction mechanism of the suspended potential discharge fault are analyzed. Once the fault occurs, its function will promote the development of the fault. The influence of the suspension potential discharge fault on the performance of the circuit breaker is also analyzed. When the suspension potential discharge fault exists, it will cause the abnormality and even affect the normal operation of the circuit breake.

Stabilizing pyritic material

1989 ◽  
Vol 4 ◽  
pp. 244-248 ◽  
Author(s):  
Donald L. Wolberg
Keyword(s):  
Significant Contribution ◽  
Organic Materials ◽  
Sedimentary Rocks ◽  
Iron Sulfides ◽  
Decomposition Products ◽  
Iron Minerals ◽  
Pyrite Formation ◽  
Organic Sediments ◽  
Freshwater Environments

The minerals pyrite and marcasite (broadly termed pyritic minerals) are iron sulfides that are common if not ubiquitous in sedimentary rocks, especially in association with organic materials (Berner, 1970). In most marine sedimentary associations, pyrite and marcasite are associated with organic sediments rich in dissolved sulfate and iron minerals. Because of the rapid consumption of sulfate in freshwater environments, however, pyrite formation is more restricted in nonmarine sediments (Berner, 1983). The origin of the sulfur in nonmarine environments must lie within pre-existing rocks or volcanic detritus; a relatively small, but significant contribution may derive from plant and animal decomposition products.

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