Investigation on the thermal decomposition and thermal reaction process of PTFE/Al/MoO3 fluorine-containing thermite

Wu, Jiaxiang; Bin, Feng; Gao, Zhenru; Li, Yu Chun; Wu, Shuangzhang; Yin, Qiang; Huang, Junyi; Ren, Xinxin

doi:10.1016/j.jfluchem.2020.109676

Cited by 18 publications

(8 citation statements)

References 29 publications

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“…In contrast, compared with the amount of metastable‐CaAl 2 Si 2 O 8 crystal particles formed when CAS GC‐Hs were prepared using MoO 3 ‐H and CB (Product‐A), the amount formed when CAS GC‐Hs were prepared using MoO 3 ‐H and CB‐S (Product‐C) increased (Figure 4A,C). The relatively lower melting point of MoO 3 (795°C 17 ) suggests that the molten MoO 3 is present before the glass melts, assuming that the molten MoO 3 spreads to the interfaces between the particles of the starting materials. Notably, the melting point of WO 3 is 1493°C 34 .…”

Section: Resultsmentioning

confidence: 99%

“…In contrast, the nucleation process of CAS GC‐H proceeds during glass‐melting process where metallic molybdenum (Mo) particles were obtained via molybdenum(VI) oxide (MoO 3 ) reduction by carbon 16 . Controlling the metal precipitation at the glass melting stage is thus critical for controlling the nucleation process in the CAS glass; the redox reaction of MoO 3 by carbon could strongly relate to the size of MoO 3 and carbon, because the melting of MoO 3 (795°C 17 ) and the combustion reaction of carbon (∼600°C 18 ) proceed under the glass‐melting stage. We, therefore, devoted special attention to changing the specific surface area of MoO 3 or the particle size of carbon used in our previous reports 11 .…”

Section: Introductionmentioning

confidence: 99%

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Effect of starting materials of nucleation agents on crystallization of CaO–Al₂O₃–SiO₂ glass

Machida

Maeda

Katsumata

et al. 2022

Int J of Appl Glass Sci

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The effect of the starting materials of the nucleation agents for glass-ceramics (GCs) was explored. The number of hexagonal platy particles of metastable-CaAl 2 Si 2 O 8 in CaO-Al 2 O 3 -SiO 2 (CAS) GCs was increased by changing the sizes of molybdenum oxide (MoO 3 ) and carbon particles used as starting materials of the nucleation agents. X-ray diffraction patterns indicated that all of GC specimens display reflections attributed to metastable-CaAl 2 Si 2 O 8 solely. In addition, scanning electron microscopy (SEM) revealed that, compared with the CAS GC with precipitated hexagonal platy particles of metastable-CaAl 2 Si 2 O 8 (CAS GC-H) prepared using MoO 3 particles with a Brunauer-Emmett-Teller (BET) surface area of 3.5 m 2 /g and 10-50 µm carbon particles, CAS GC-Hs prepared using MoO 3 particles with a BET surface area of 1.2 m 2 /g or carbon fibers 10-50 µm in length and ∼5 µm in diameter resulted in approximately a twofold increase in the number of platy particles of metastable-CaAl 2 Si 2 O 8 and a decrease in the average particle size from 13 to 11 µm. The microstructures of the CAS GC-Hs are closer looks. In addition, no major differences in volume fractions estimated using the binarized SEM images are observed between those GC specimens. These results indicated that the starting materials of nucleation agents affect the crystallization of CAS GCs.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of starting materials of nucleation agents on crystallization of CaO–Al₂O₃–SiO₂ glass

Machida

Maeda

Katsumata

et al. 2022

Int J of Appl Glass Sci

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“…The calorific value of oxygen bomb combustion of 2# is 38.829% higher than that of Al/PTFE with a chemical equilibrium mass ratio of 26.5/73.5 [ 31 ], which is 18.731% higher than that of Al/PTFE/TiH 2 [ 31 ] with 30% the content of TiH 2 . Al/PTFE/TiH 2 [ 31 ] with 30% the content of TiH 2 is 28.899% higher than that of Al/PTFE/TiH 2 [ 31 ] with 10% the content of TiH 2 , which is 23.950% higher than that of Al/PTFE/MoO 3 [ 43 ] with 43% the content of MoO 3 . The calorific value of oxygen bomb combustion of 5# is 33.766% higher than that of Al/PTFE/TiH 2 [ 31 ] with 10% the content of TiH 2 , which is 23.214% higher than that of Al/PTFE/TiH 2 [ 31 ] with 30% the content of TiH 2 , and Al/PTFE/TiH 2 [ 31 ] with 30% the content of TiH 2 is 28.630% higher than that of Al/PTFE/MoO 3 [ 43 ] with 43% the content of MoO 3 .…”

Section: Resultsmentioning

confidence: 99%

“…Al/PTFE/TiH 2 [ 31 ] with 30% the content of TiH 2 is 28.899% higher than that of Al/PTFE/TiH 2 [ 31 ] with 10% the content of TiH 2 , which is 23.950% higher than that of Al/PTFE/MoO 3 [ 43 ] with 43% the content of MoO 3 . The calorific value of oxygen bomb combustion of 5# is 33.766% higher than that of Al/PTFE/TiH 2 [ 31 ] with 10% the content of TiH 2 , which is 23.214% higher than that of Al/PTFE/TiH 2 [ 31 ] with 30% the content of TiH 2 , and Al/PTFE/TiH 2 [ 31 ] with 30% the content of TiH 2 is 28.630% higher than that of Al/PTFE/MoO 3 [ 43 ] with 43% the content of MoO 3 . Based on the above data, the oxygen bomb calorific value of Al/TiH 2 active material is the highest when TiH 2 is added to Al, and the oxygen bomb calorific value of Al/PTFE active material is the highest when TiH 2 is added to Al-rich Al/PTFE active material, that of which is higher than the Al/PTFE active materials with different contents of TiH 2 and MoO 3 under the equilibrium state.…”

Section: Resultsmentioning

confidence: 99%

Mechanism of Pyrolysis Reaction of Al-Rich Al/PTFE/TiH2 Active Material

et al. 2021

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In order to obtain the chemical reaction mechanism of Al-rich Al/PTFE/TiH2 composites in argon and oxygen atmosphere, Al/PTFE, PTFE/TiH2, Al/TiH2 and Al-rich Al/PTFE/TiH2 with different contents of TiH2 composites were prepared by using the wet mixing method. The pyrolysis behavior of the above composites was investigated by thermogravimetric differential scanning calorimeter (TG-DSC). In addition, the calorific value of the above composite was measured by an oxygen bomb calorimeter. The compositions of TG-DSC residues at different peak temperatures and 1000 °C and the residues of oxygen bomb experiment were analyzed by X-ray diffraction (XRD), The results show that the pyrolytic products of Al-rich Al/PTFE/TiH2 materials under argon atmosphere can be divided into four stages. In the first stage (328.6–378.6 °C), the products are TiH1.924, (C2F4)n, (CF2)n, H2(g), Al and TiH2; in the second stage (510.8–534.3 °C), the products are Al, TiH1.924, (C2F4)n, (CF2)n, Ti, AlF3, TiF3, TiF4(g), C and H2(g). In the third stage (540.8–618.1 °C), the products are Al, C, Ti, (C2F4)n, (CF2)n, AlF3, TiF3, TiF4, CF4(g), C3F6(g), C4F8(g), C2F6(g), Al5Ti2 and H2(g); in the fourth stage (918.5–1000 °C), the products are AlCTi2, Al2Ti, AlTi, TiC, AlF3, Al, TiF3, TiC0.957, TiC0.981 and TiC0.95. The calorific value of the combustion of Al-rich Al/PTFE/TiH2 composite with 10% the content of TiH2 is the highest and is 19,899 J/g, which is 3.776% higher than that of Al-rich Al/PTFE composite. When TiH2 content is greater than zero and not more than 10%, the chemical reaction mechanism of Al-rich Al/PTFE/TiH2 is almost the same under oxygen atmosphere. When the content of TiH2 is higher than 10%, the mechanism of this material is different.

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“…The thermal decomposition and thermal reaction process of PTFE/Al/MoO 3 fluorine-containing thermite at different temperatures were investigated by mass spectrometry coupling tests. The results showed that PTFE served as both oxidant and reductant in fluorine-containing thermite [ 287 ]. Hydroxylammonium nitrate monopropellant with its low sensitivity, volatility, and toxicity, not only promises a safer substitute for hydrazine but also offers a higher specific impulse and a positive oxygen balance.…”

Section: Applications To Explosives and Propellantsmentioning

confidence: 99%

On-Line Thermally Induced Evolved Gas Analysis: An Update—Part 1: EGA-MS

et al. 2022

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Advances in on-line thermally induced evolved gas analysis (OLTI-EGA) have been systematically reported by our group to update their applications in several different fields and to provide useful starting references. The importance of an accurate interpretation of the thermally-induced reaction mechanism which involves the formation of gaseous species is necessary to obtain the characterization of the evolved products. In this review, applications of Evolved Gas Analysis (EGA) performed by on-line coupling heating devices to mass spectrometry (EGA-MS), are reported. Reported references clearly demonstrate that the characterization of the nature of volatile products released by a substance subjected to a controlled temperature program allows us to prove a supposed reaction or composition, either under isothermal or under heating conditions. Selected 2019, 2020, and 2021 references are collected and briefly described in this review.

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Investigation on the thermal decomposition and thermal reaction process of PTFE/Al/MoO3 fluorine-containing thermite

Cited by 18 publications

References 29 publications

Effect of starting materials of nucleation agents on crystallization of CaO–Al₂O₃–SiO₂ glass

Effect of starting materials of nucleation agents on crystallization of CaO–Al₂O₃–SiO₂ glass

Mechanism of Pyrolysis Reaction of Al-Rich Al/PTFE/TiH2 Active Material

On-Line Thermally Induced Evolved Gas Analysis: An Update—Part 1: EGA-MS

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Investigation on the thermal decomposition and thermal reaction process of PTFE/Al/MoO3 fluorine-containing thermite

Cited by 18 publications

References 29 publications

Effect of starting materials of nucleation agents on crystallization of CaO–Al2O3–SiO2 glass

Effect of starting materials of nucleation agents on crystallization of CaO–Al2O3–SiO2 glass

Mechanism of Pyrolysis Reaction of Al-Rich Al/PTFE/TiH2 Active Material

On-Line Thermally Induced Evolved Gas Analysis: An Update—Part 1: EGA-MS

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Effect of starting materials of nucleation agents on crystallization of CaO–Al₂O₃–SiO₂ glass

Effect of starting materials of nucleation agents on crystallization of CaO–Al₂O₃–SiO₂ glass