MDPI - Publisher of Open Access Journals

11 pages, 2598 KiB

Open AccessArticle

Characterization and Analysis of Micromechanical Properties on DNTF and CL-20 Explosive Crystals

by Hai Nan, Yiju Zhu, Guotao Niu, Xuanjun Wang, Peipei Sun, Fan Jiang and Yufan Bu

Crystals 2023, 13(1), 35; https://doi.org/10.3390/cryst13010035 - 25 Dec 2022

Cited by 3 | Viewed by 1988

To study the crystal mechanical properties of 3,4-dinitrofurazanofuroxan (DNTF) and hexanitrohexaazaisowurtzitane (CL-20) deeply, the crystals of DNTF and CL-20 were prepared by the solvent evaporation method. The crystal micromechanical loading procedure was characterized by the nanoindentation method, and then obtained the mechanical parameters. In addition, the crystal fracture behaviors were investigated with scanning probe microscopy (SPM). The results show that the hardness for DNTF and CL-20 was 0.57 GPa and 0.84 GPa, and the elastic modulus was 10.34 GPa and 20.30 GPa, respectively. CL-20 obviously exhibits a higher hardness, elastic modulus and local energy-dissipation and a smaller elastic recovery ability of crystals than those of DNTF. CL-20 crystals are more prone to cracking and have a lower fracture toughness value than DNTF. Compared to DNTF crystals, CL-20 is a kind of brittle material with higher modulus, hardness and sensitivity than that of DNTF, making the ignition response more likely to happen. Full article

(This article belongs to the Special Issue Advanced Energetic Materials: Testing and Modeling)

► Show Figures

Figure 1

13 pages, 4890 KiB

Open AccessArticle

Inkjet Printing of GAP/NC/DNTF Based Microscale Booster with High Strength for PyroMEMS

by Yining He, Xiuti Guo, Yanling Long, Guangwu Huang, Xiangpu Ren, Chuanhao Xu and Chongwei An

Micromachines 2020, 11(4), 415; https://doi.org/10.3390/mi11040415 - 14 Apr 2020

Cited by 18 | Viewed by 3196

Abstract

In order to improve the mechanical strength of micro-booster based on 3,4-dinitrofurazanofuroxan (DNTF), 2,4-toluene diisocyanate (TDI) was introduced into the composite binder of nitrocotton (NC) and glycidyl azide polymer (GAP). A full-liquid explosive ink containing DNTF, binder and solvent was printed layer by layer. By the polymer cross-linking technology, the inkjet printed sample with three-dimensional network structure was obtained. The morphology, crystal form, density, mechanical strength, thermal decomposition and micro scale detonation properties of the printed samples were tested and analyzed. The results show that the printed sample has a smooth surface and a dense internal microstructure, and the thickness of the single layer printing is less than 10 μm. Compared with the raw material DNTF, the thermal decomposition temperature and activation energy of the printed samples do not change significantly, indicating better thermal stability. The addition of curing agent TDI increases the mechanical properties and charge density of the energetic composites. The elastic modulus and hardness are increased by more than 20%. The charge density can attain 1.773 g·cm⁻³, which can reach 95.5% of the theoretical density. The critical detonation size of the sample can reach 1 mm × 0.01 mm or less and the detonation velocity can achieve 8686 m·s⁻¹, which exhibits excellent micro-scale detonation ability. Full article

(This article belongs to the Special Issue Miniaturized Pyro Devices)

► Show Figures

Figure 1

Search Results (2)

Further Information

Guidelines

MDPI Initiatives

Follow MDPI

Saved Queries

Search Filter Reset All

Years

Feature Papers

Subjects

Journals

Article Types

Countries / Regions

Search Results (2)

Further Information

Guidelines

MDPI Initiatives

Follow MDPI