The Effect of High-Quality RDX on the Safety and Mechanical Properties of Pressed PBX
In order to investigate and compare the effects of RDX crystal quality on the safety and mechanical properties of pressed PBX, different RDX-based PBXs were prepared by a water suspension granulation method. The surface morphology, thermal decomposition properties, impact sensitivity, and mechanical...
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| Format: | Article |
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MDPI AG
2022-02-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/3/1185 |
| _version_ | 1797486534417448960 |
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| author | Shixiong Chen Hua Qian Bingxin Liu Feiyang Xu Jiuhou Rui Dabin Liu |
| author_facet | Shixiong Chen Hua Qian Bingxin Liu Feiyang Xu Jiuhou Rui Dabin Liu |
| author_sort | Shixiong Chen |
| collection | DOAJ |
| description | In order to investigate and compare the effects of RDX crystal quality on the safety and mechanical properties of pressed PBX, different RDX-based PBXs were prepared by a water suspension granulation method. The surface morphology, thermal decomposition properties, impact sensitivity, and mechanical properties of high-quality RDX (H-RDX) and PBX were characterized by SEM, optical microscope, DSC, impact sensitivity tester, and universal material testing machines. The results have shown that the H-RDX crystal has a smoother surface, regular shape, higher density, fewer defects, better thermal stability, and lower impact sensitivity than raw RDX. The activation energy of H-RDX-based PBX is 26.0% higher than that of raw RDX-based PBX, and <i>H</i><sub>50</sub> increased by 2.8 cm, indicating that the application of H-RDX to PBX can effectively improve its thermal stability and reduce the impact sensitivity in the safety performance. However, the compressive strength of pressed H-RDX-based PBX is 36% lower than that of pressed raw RDX-based PBX, showing that H-RDX results in the deterioration of the compressive strength of pressed PBX in mechanical performance. Fortunately, this study found a strategy on how to effectively improve mechanical performance, which is changing the type of binder and increasing the pressing pressure. Under the same pressing conditions, the order of compressive strength of PBX prepared by the three binders is FKM DS2603 > Viton A > PVAc. Moreover, the compressive strength of H-RDX-based PBX with FKM DS2603 can be increased by 33.7% compared with PVAc. When the pressing pressure is 200 MPa, the average compressive strength of H-RDX-based PBX with FKM DS2603 reaches 10.00 MPa, which can basically meet application requirements. |
| first_indexed | 2024-03-09T23:34:37Z |
| format | Article |
| id | doaj.art-f116fb73d37940758fc9d422f676033d |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T23:34:37Z |
| publishDate | 2022-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-f116fb73d37940758fc9d422f676033d2023-11-23T17:03:45ZengMDPI AGMaterials1996-19442022-02-01153118510.3390/ma15031185The Effect of High-Quality RDX on the Safety and Mechanical Properties of Pressed PBXShixiong Chen0Hua Qian1Bingxin Liu2Feiyang Xu3Jiuhou Rui4Dabin Liu5School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaSchool of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaSchool of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaSchool of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaState Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, ChinaSchool of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, ChinaIn order to investigate and compare the effects of RDX crystal quality on the safety and mechanical properties of pressed PBX, different RDX-based PBXs were prepared by a water suspension granulation method. The surface morphology, thermal decomposition properties, impact sensitivity, and mechanical properties of high-quality RDX (H-RDX) and PBX were characterized by SEM, optical microscope, DSC, impact sensitivity tester, and universal material testing machines. The results have shown that the H-RDX crystal has a smoother surface, regular shape, higher density, fewer defects, better thermal stability, and lower impact sensitivity than raw RDX. The activation energy of H-RDX-based PBX is 26.0% higher than that of raw RDX-based PBX, and <i>H</i><sub>50</sub> increased by 2.8 cm, indicating that the application of H-RDX to PBX can effectively improve its thermal stability and reduce the impact sensitivity in the safety performance. However, the compressive strength of pressed H-RDX-based PBX is 36% lower than that of pressed raw RDX-based PBX, showing that H-RDX results in the deterioration of the compressive strength of pressed PBX in mechanical performance. Fortunately, this study found a strategy on how to effectively improve mechanical performance, which is changing the type of binder and increasing the pressing pressure. Under the same pressing conditions, the order of compressive strength of PBX prepared by the three binders is FKM DS2603 > Viton A > PVAc. Moreover, the compressive strength of H-RDX-based PBX with FKM DS2603 can be increased by 33.7% compared with PVAc. When the pressing pressure is 200 MPa, the average compressive strength of H-RDX-based PBX with FKM DS2603 reaches 10.00 MPa, which can basically meet application requirements.https://www.mdpi.com/1996-1944/15/3/1185high-quality RDXthermal decomposition performanceimpact sensitivitymechanical performancecompressive strength |
| spellingShingle | Shixiong Chen Hua Qian Bingxin Liu Feiyang Xu Jiuhou Rui Dabin Liu The Effect of High-Quality RDX on the Safety and Mechanical Properties of Pressed PBX Materials high-quality RDX thermal decomposition performance impact sensitivity mechanical performance compressive strength |
| title | The Effect of High-Quality RDX on the Safety and Mechanical Properties of Pressed PBX |
| title_full | The Effect of High-Quality RDX on the Safety and Mechanical Properties of Pressed PBX |
| title_fullStr | The Effect of High-Quality RDX on the Safety and Mechanical Properties of Pressed PBX |
| title_full_unstemmed | The Effect of High-Quality RDX on the Safety and Mechanical Properties of Pressed PBX |
| title_short | The Effect of High-Quality RDX on the Safety and Mechanical Properties of Pressed PBX |
| title_sort | effect of high quality rdx on the safety and mechanical properties of pressed pbx |
| topic | high-quality RDX thermal decomposition performance impact sensitivity mechanical performance compressive strength |
| url | https://www.mdpi.com/1996-1944/15/3/1185 |
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