Al-LiH复合燃料制备及性能OACSTPCD

To improve the combustion efficiency of aluminum powders,Al-LiH composite fuels with mass contents of 3%,5%,10%,and 15%were prepared using the ball milling method,respectively.The sample structure,morphology,and particle size are characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),and particle size analyzer.The thermal oxi-dation performance was characterized using the DSC-TG.Finally,their combustion performance was investigated using the CO2 laser ignition device,high-speed camera,and oxygen bomb calorimeter.The results show that LiH can be embedded into Al powder through the ball milling method,and the LiH content is a key factor affecting its microstructure,particle size,and parti-cle size distribution.The addition of LiH increases the mass calorific value of fuel.At the same time,with the increase of LiH con-tent,the combustion flame intensity of Al-LiH composite fuel increases and the ignition delay time significantly decreases.Among them,Al-3LiH and Al-10LiH composite fuels achieve second oxidation after the first oxidation.The analysis suggests that the second oxidation phenomenon is caused by the microexplosion phenomenon of Al-LiH composite fuel at high temperatures.