In-situ constructing nano ternary Ni-P-Cu alloy shell on the micro-aluminum surface: Enhancing its ignition and combustion performances

To improve the combustion efficiency of widely used micro-aluminum (mu Al) particle, enhancing its ignition and combustion performances is a critical issue via breaking through the intrinsic Al2O3 layer covering the Al-core. This study proposed a facile in-situ 'one-pot' electroless plating method to functionalize the surface of mu Al particles with ternary-shelled nickel-phosphorus-copper alloy coating and furthermore investigated the ther-mochemical and ignition/combustion behaviors of energetic core-shell composites (defined as Al@Ni-P-Cu). The microstructure characterization results of Al@Ni-P-Cu demonstrated that a spherically distributed triple-shell Ni-P-Cu alloy with the thickness of 129 nm was tightly coated on mu Al particle surface. Through TG-DSC analysis, the Al@Ni-P-Cu composites exhibited improved heat release (7597.7 J/g) and decreased initial oxidation temper-ature (814.3 degrees C) in comparison to that of mu Al particle with 949.2 J/g and 960.1 degrees C, respectively. The Al@Ni-P-Cu exhibited extremely shorter laser ignition delay time of 36.3 ms under 1 MPa O2 atmosphere, reducing by 86.86% compared with that of raw mu Al particles (276.3 ms); and its maximum flame temperature could reach up to 1588.93 degrees C, increasing by 243.36 degrees C compared with that of mu Al (1345.57 degrees C). The drastic improving per-formances were attributed to the synergistic effects of surface/interfaces reactions along with heat release in the core-shell structure, resulting in enhanced mass and heat transfer to facilitate the combustion of internal Al-core.