Thermal Decomposition and Thermal Reaction Process of PTFE/Al/MnO2 Fluorinated Thermite

Zhang, Jun; Huang, Junyi; Fang, Xiang; Li, Yuchun; Yu, Zhongshen; Gao, Zhenru; Wu, Shuangzhang; Li, Yang; Wu, Jiaxiang; Kui, Jiaying

doi:10.3390/ma11122451

Cited by 36 publications

(22 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…So peak A is the melting endothermic peak of PTFE. Starting from 509 °C, the TG curve shows a sharp drop in sample mass and the loss is 100%, and peak B starts at 514.02 °C, indicating that peak B is the endothermic decomposition peak of PTFE, and the decomposition product is gaseous product C 2 F 4 with the boiling point of −76 °C [24].…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Sintering Reaction and Pyrolysis Process Analysis of Al/Ta/PTFE

Zhang

Huang

et al. 2019

Polymers

Self Cite

View full text Add to dashboard Cite

When the Al/Ta/PTFE reactive material was sintered at 360 °C in a vacuum sintering furnace, it was found that the material reacted to form a soft fluffy white substance and carbon black. To explore the reaction process further, powder samples of pure PTFE, Al/PTFE, Ta/PTFE and Al/Ta/PTFE, and molded cylindrical specimens were prepared. A TG-DSC test was carried out on the thermal reaction of four reactive materials, and XRD phase analysis was conducted on the white product, formed by the sintering reaction and the residue of the TG-DSC test sample, based on which of the pyrolysis processes and reaction mechanisms were analyzed. The results show that Ta and PTFE could have a chemical reaction at sintering temperature (360 °C) to form soft and fluffy white material TaF3 and carbon black, which can overflow the surface of the specimen and cause cracking of the specimen, which is tightly pressed. Since no obvious exothermic peak showed up on the TG-DSC curve, the composition of the residue of TG-DSC sample at different temperatures was tested and TaF3 was detected in the residue at 350 °C and 360 °C, indicating that Ta began to react with PTFE at a temperature range of 340–350 °C. According to the chemical properties and product formation of Ta, it could be speculated that the reaction mechanism between Ta and PTFE involves the PTFE decomposing first, then the fluorine-containing gas product reacting with metal Ta. According to the temperature range of the reaction, it is estimated that PTFE starts to decompose before 500 °C, but it is not detected effectively by TG-DSC, and the introduction of Ta could also affect the decomposition process of PTFE.

show abstract

Section: Resultsmentioning

confidence: 99%

“…The boiling point of the produced AlF 3 is low and could not hinder the reaction by covering on the surface of Al particles [27]. The peak temperature of peak D is 659 °C, resulting from heat absorption of Al powder, which has not reacted completely at about 660 °C [24].…”

Section: Resultsmentioning

confidence: 99%

Sintering Reaction and Pyrolysis Process Analysis of Al/Ta/PTFE

Zhang

Huang

et al. 2019

Polymers

Self Cite

View full text Add to dashboard Cite

show abstract

“…Because type B specimen possessed excellent ductility and absorbed the most energy during compression, the energy could stimulate the thermite reaction as well as the reaction of Al and PTFE. Zhang et al 27 investigated the thermal decomposition and thermal reaction process of PTFE/Al/MnO 2 uorinated thermite. Experimental results indicate that PTFE behaved as both oxidizer and reducer in PTFE/Al/MnO 2 uorinated thermite.…”

Section: Reaction Phenomenon Under Quasi-static Compressionmentioning

confidence: 99%

A comparative study on the mechanical and reactive behavior of three fluorine-containing thermites

Liu

Bin³

et al. 2020

RSC Adv.

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the last ten years, the main research based on Al/PTFE reaction materials is as follows: (1) study on the composition ratio and mixing methods of Al/PTFE-based active materials; (2) study on the mechanical properties, reaction characteristics, impact sensitivity, ignition mechanism and hot spot formation mechanism of crack tip of Al/PTFE-based active materials; (3) study on the energy release characteristics of Al/PTFE-based active materials; (4) study on the establishment of a theoretical model of impact-induced chemical reaction of Al/PTFE-based active materials. Among them, some scholars introduce high density metals such as Ni [ 13 ], W [ 14 , 15 ] and Ta [ 16 ] into Al/PTFE-based active materials to improve their hardness, density, strength and other characteristics; some scholars have added metal oxides CuO [ 17 ], Fe 2 O 3 [ 18 ] and MnO 2 [ 19 ] to Al/PTFE-based active materials to improve their reaction characteristics; some scholars have added high-energy additives such as TiH 2 [ 20 ] and ZrH 2 [ 21 ] to Al/PTFE-based active materials to improve their energy release characteristics. Based on published literature of the above studies, it can be found that most scholars mainly study the influence of distribution ratio, particle size and other factors on material properties through a given sintering control curve, while few scholars study the influence of sintering control factors on material properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sintering Factors on Properties of Al-Rich PTFE/Al/TiH2 Active Materials

2021

View full text Add to dashboard Cite

Sintering process is an important part of the specimen preparation process, which directly affects the properties of materials. In order to obtain the best sintering control factors of Al-rich PTFE/Al/TiH2 active materials, Al-rich PTFE/Al/TiH2 active specimens with different sintering control factors were prepared using a mold pressing sintering method. A quasi-static compression experiment was carried out on a universal material testing machine, and a real stress-strain curve was obtained. The effects of sintering control factors on the properties of Al-rich PTFE/Al/TiH2 active materials were analyzed by means of mechanical parameters such as compressive strength, failure strain and toughness. SEM and XRD were used to analyze the microstructure and phase of the sintered samples. The results show that: (1) With the increase of cooling rate, the density, yield strength, strain hardening modulus, compressive strength and toughness of Al-rich Al/PTFE/TiH2 specimens decrease gradually, while the failure strain and pores of the specimens increase gradually. (2) With the increase of sintering temperature, the density, maximum true strain and toughness of the specimens first increase and then decrease, and the failure strain of the specimens gradually increases. When the sintering temperature is 360 °C, the PTFE matrix and particles inside the specimen are closely combined, a small number of particles are exposed on the PTFE matrix and there are a small number of voids. (3) With the increase of holding time at 360 °C, the strength and toughness of the material first decrease and then increase. When the holding time is 6 h, the interface between particles and matrix inside the specimen is the strongest, and the crack propagation inside the specimen is less. (4) When the sintering time increased from 1 h to 4 h at 315 °C, the compressive strength of the specimen increased by 1.62%, the toughness of the specimen decreased by 0.55% and the failure strain of the specimen decreased by 0.54%. The interface between PTFE matrix and particles is the strongest and the crack propagation is less in the specimen with a holding time of 4 h. (5) Above all, the optimum sintering parameters of Al-rich Al/PTFE/TiH2 materials are cooling rate of 25 °C/h, sintering temperature of 360 °C, holding time of 6 h and holding time of 4 h at 315 °C. (6) The reactivity of Al-rich Al/PTFE/TiH2 specimens with 10% content of TiH2 under static compression is not significantly affected by sintering parameters.

show abstract

Thermal Decomposition and Thermal Reaction Process of PTFE/Al/MnO2 Fluorinated Thermite

Cited by 36 publications

References 12 publications

Sintering Reaction and Pyrolysis Process Analysis of Al/Ta/PTFE

Sintering Reaction and Pyrolysis Process Analysis of Al/Ta/PTFE

A comparative study on the mechanical and reactive behavior of three fluorine-containing thermites

Effect of Sintering Factors on Properties of Al-Rich PTFE/Al/TiH2 Active Materials

Contact Info

Product

Resources

About