To study the influence of burning rate inhibitors on the combustion performance of four-component HTPB propel-lants,two typical burning rate inhibitors(quaternary ammonium salt and adamantane derivative)were introduced into the alu-minum based composite particles with core-shell structure Al@HMX and AP@Al,and the site of action of inhibitors was set to be inside HMX particles or on the surface of AP to prepare two types of Al-based core-shell composites(Al/A@HMX,Al/B@HMX,AP@Al/A and AP@Al/B).Results show that the heat of explosion of solid propellants can be reduced by these burning rate inhibitors,whereas the propellants containing Al@HMX in the presence of quaternary ammonium salt could be increased by 338 J/g.Thermal decomposition process of HMX and AP can be inhibited,exhibiting a"platform"with a low-intensity before the AlO irradiation peak.The inclusion of Al@HMX can reduce the ignition delay time of corresponding propellants by 49.4％.The two kinds of burning rate inhibitors can significantly reduce the burning rates of propellants over the pressure range of 10-20MPa.A burning rate reduction of 7.1 mm/s(38.4％)and a decreasing pressure exponent of 0.25 were ob-tained for propellant containing Al@HMX composites and quaternary ammonium salt.The propellant burning rate can be de-creased by 5.0 mm/s(27.3％)under 20 MPa when 1％of quaternary ammonium salt was sited on the surface of AP.
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