BiOF的掺入对n-Al/CuO纳米铝热体系性能的影响

Effect of BiOF Addition on Properties of n-Al/CuO Nano-Thermite System

为了提高n-Al/CuO体系的增压能力,改善其点火性能,选用含氟氧化剂氟氧化铋(BiOF)作为典型铝热体系n-Al/CuO中CuO的替代,并将BiOF成功复合于n-Al/CuO体系中。分别使用扫描电镜(SEM)、X射线衍射仪(XRD)、X射线光电子能谱仪(XPS)研究了复合材料的微观结构、晶体结构特征和表面元素组成及价态。使用高速摄影、高速红外热像仪和压力传感器研究了复合体系在限制条件下的火焰传播速率、点火温度和增压性能。结果表明,BiOF可以在n-Al/CuO体系中作为CuO的良好的替代物。当BiOF的替代质量分数为9%时,体系在限制条件下的火焰传播速率从385 m/s提高至478 m/s,提高了24.1%;输出的峰值压力从1.32 MPa提高至1.51 MPa;增压速率从43 MPa提高至72 MPa;点火温度也得到显著的下降。总之,作为CuO的替代物,BiOF可以有效改善n-Al/CuO的点火性能,并提升体系在限制条件下的能量输出能力。

In order to improve the pressurization capacity and ignition performance of n-Al/CuO system,fluorine containing oxidant BiOF was selected as a substitute for CuO,and it was successfully composite in the typical aluminothermal system n-Al/CuO.The microstructure,crystal structure characteristics,surface element composition and valence states of the composite materials were studied using scanning electron microscopy(SEM),X-ray diffraction(XRD),and X-ray photoelectron spectroscopy(XPS),respectively.The flame propagation rate,ignition temperature,and pressurization performance of the composite system under confinement conditions were studied using high-speed photography,high-speed infrared thermal imager,and pressure sensor.The results indicate that BiOF can serve as a good substitute for CuO in the n-Al/CuO system.When the mass fraction of the substituted BiOF is 9%,the flame propagation rate of the system under confinement conditions increases from 385 m/s to 478 m/s,an increase of 24.1%.The output peak pressure increased from 1.32 MPa to 1.51 MPa,and the pressurization rate increased from 43 MPa to 72 MPa,respectively.The ignition temperature has also significantly decreased.In conclusion,as a substitute for CuO,BiOF can effectively improve the ignition performance of n-Al/CuO and enhance its energy output ability under confinement conditions.