Large-scale production of (2,4-DHB) n M micro-nano spheres by spray drying and their application as catalysts for ammonium perchlorate

et al. 2020

Self Cite

This paper mainly describes a nano‐spherical energetic catalyst Cu‐en. The result of particle size distribution shows that the D50 value of Cu‐en is 80.18 nm. The thermal decomposition process of RDX, AP, and NC is improved obviously after mixed with Cu‐en. Among them, the change of AP is the most significant, and its peaks of high‐temperature decomposition and low‐temperature decomposition degenerate into one decomposition peak. The thermal decomposition temperature of NC also decreased from 214.5 °C to 191.6 °C. In the range of 3–9 MPa, Cu‐en can significantly increase the burning rate of HTPB propellant and reduce the pressure exponent n from 0.684 to 0.459. According to the test data results of the CMDB propellant, the nano‐spherical Cu‐en prepared by the spray drying method has a stronger catalytic ability than the micro‐nano Cu‐en prepared by the high‐energy ball milling method.

Section: Resultsmentioning

confidence: 99%

Preparation of Nano‐Spherical Cu‐en and Its Catalytic Study on the Performance of Solid Propellant

et al. 2020

Self Cite

“…Wenyuan Zhao used an ultrasonic spray method to prepare a variety of spherical metal organic salt catalysts. This spherical catalyst has a good promotion effect on the thermal decomposition of AP .…”

Section: Introductionmentioning

confidence: 96%

Preparation of Ta(Ph)‐Fe/AP Composite Microspheres by Ultrasonic Spray Drying and Characterization of Their Catalytic Properties

2020

Self Cite

In this study, the ultrasonic spray drying technology was applied to prepare composite microspheres of catalyst (Ta−Fe, Ph−Fe) and AP. The surface morphology of the two composite microspheres was characterized by scanning electron microscopy (SEM). Their particle size distribution characteristics were tested by a nano laser particle size analyzer. The results showed that the spray drying technology can uniformly compound the AP and the catalyst into spherical particles. The thermal decomposition process of Ta(Ph)‐Fe/AP composite microspheres were tested by differential scanning calorimetry (DSC). The DSC data demonstrated that Ta(Ph)‐Fe/AP composite microsphere had a very good catalytic effect and significantly promoted the thermal decomposition process of AP. In addition, the catalytic mechanism was discussed by calculating the change in activation energy. Compared with the raw AP, the activation energies of the Ta−Fe/AP and Ph−Fe/AP composite microspheres were reduced by 18.5 kJ/mol and 28.1 kJ/mol, respectively.

“…[28] Vincent Pichot et al studied the elaboration of TNT, HMX, and HMX composites by the SFE process [29,30]. (2,4-DHB) nM micro-nano spheres that could catalyze the thermal decomposition of AP were successfully produced by ultrasonic spray drying technology [31]. Victor Stepanov et al prepared nano-RDX and its composite particles with polymeric binder through the rapid expansion of supercritical solutions (RESS) technology [32,33].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Microspherical Ph−Fe/RDX(HMX) Composite Particles and their Thermal Decomposition Behaviors

2021

Self Cite

This paper mainly introduces the PhÀ Fe/RDX (HMX) composite microspheres prepared by ultrasonic spray drying. Their morphology was observed by SEM and found that the composite microspheres were spherical. Also, the composite microspheres exhibited good dispersion. The results of the granularity data show that the D 50 data of PhÀ Fe/RDX and PhÀ Fe/HMX were 580.78 nm and 496.52 nm, respectively. The DSC data showed that the catalytic effect of the composite microspheres was sig-nificantly better than that of the mixed powder. The DSC data showed that the decomposition peak temperature of the PhÀ Fe/RDX(HMX) composite microsphere was 229.6°C (279.6) lower than the 235.6°C (284.3) of the mixed powder. The DSC data demonstrated that the catalytic performance of the composite microspheres was significantly better than that of the mixed powder. Therefore, the ultrasonic spray drying method has great potential for preparing energetic composite microspheres.