Possibility of aluminium/magnesium exchange in composite rocket propellants

Abstract

Composite solid propellants based on ammonium perchlorate/hydroxyterminated polybutadiene/isophorone dyisocyanate including two metal components: aluminium and magnesium with different contents have been represented in this paper. The mass of metal powder has increased in relation to oxidant, with constant bimodal fraction ratio and total solid phase. Parameters of burning rate laws, apparent viscosity, uniaxial mechanical characteristic, density and energetic values have been determined and compared in accordance to the propellants of the smoke reduction research.

Enhancing the performance of HTPB‐IPDI‐based polyurethane composite liner through effective carbon black dispersion**

“…The main structure of a solid rocket motor consists of four parts that are propellant, motor case, nozzle, and igniter. The propellant is a combustible material that generates hot gases after the combustion and is then expelled through a nozzle resulting in a high‐speed thrust [2]. There are also non‐combustible materials such as insulation to protect the combustion chamber from high temperatures, and a liner that is an adhesion layer between the propellant and insulation and acts as a stress transfer medium.…”

Effects of micro and nano fillers on the mechanical and thermal properties of hydroxyl‐terminated polybutadiene‐polyurethane based rocket motor liner

“…Among solid rocket motors, case bonded motors are of great importance in both defense and aerospace industries due to capability of carrying higher payloads for longer ranges [1,2]. In a typical solid rocket motor to adhere solid propellant to the insulator, an adhesive layer called liner is applied between them [3][4][5]. Adhesion at propellant-liner and liner-insulator interfaces are of critical importance as any failure at that region may end up with a catastrophic consequence [6][7][8].…”

“…Polyurethanes based on hydroxyl-terminated polybutadiene (HTPB) binder are frequently used as propellant and liner materials due to superior chemical and physical properties of HTPB. [4,10,11]. In many cases, fillers are added to the HTPB based liner to provide structural integrity as well as high temperature resistance against flow of hot gases [4].…”

“…[4,10,11]. In many cases, fillers are added to the HTPB based liner to provide structural integrity as well as high temperature resistance against flow of hot gases [4]. Structural reinforcement is provided by the fillers which can be described as polymer chains and segments are adsorbed on the filler surface that consequently reduces the mobility of the polymer molecules partially and hence affects the viscoelastic behavior [12].…”

“…Structural reinforcement is provided by the fillers which can be described as polymer chains and segments are adsorbed on the filler surface that consequently reduces the mobility of the polymer molecules partially and hence affects the viscoelastic behavior [12]. Another benefit of using fillers is the obstruction effect against diffusion of mobile species across propellant-insulator layers which leads to the changes in desired properties of propellant and liner [4,[13][14][15][16][17]. Obstruction effect of fillers is delivered by limiting the diffusion rate of the diffusing molecules [14].…”