Combustion of activated aluminum

Abstract Combustion of activated aluminum was studied by four different methods: microscopic imaging of the preignition process, digital imaging of the combustion process at pressures up to 64 bar in air, nitrogen, and carbon dioxide, TGA, and DSC. Activation by three fundamentally different methods was found effective in enhancing both the ignitability and the burn rate. The complex fluoride coating prevented agglomeration completely in all stages of combustion, while the nickel and cobalt coatings promoted agglomeration of aluminum oxide at combustion, but prevented the agglomeration of the aluminum metal before combustion. Nickel coating catalyzed aluminum nitride formation, accelerating burn rate more than other coatings in air and in nitrogen, while complex fluoride coating was most effective in carbon dioxide. Carbon coagulation in carbon dioxide quenched burning in many cases at higher pressures than 8 bar. The complex fluoride activation accelerated combustion in CO 2 extremely effectively, but did not prevent carbon shell formation and subsequent quenching at high pressures. Ni coating negated the effects of carbon coagulation in CO 2 , but enhanced the burn rate only slightly. Co coating reduced the carbon shell formation, but did not accelerate combustion in CO 2 . Only the Ni coating applied in large amounts promoted combustion in nitrogen.

[1]  R. K. Sigman,et al.  Behavior of Aluminum in Solid Propellant Combustion. , 1978 .

[2]  C. Chauveau,et al.  Ignition and Combustion of Levitated Magnesium and Aluminum Particles in Carbon Dioxide , 2001 .

[3]  Alon Gany,et al.  Agglomeration and ignition mechanism of aluminum particles in solid propellants , 1979 .

[4]  C. Chauveau,et al.  Ignition and Combustion of Al Particles Clad by Ni , 2002 .

[5]  A. Gany,et al.  Aluminized Solid Propellants Burning in a Rocket Motor Flowfield , 1978 .

[6]  H. S. Fogler,et al.  Elements of Chemical Reaction Engineering , 1986 .

[7]  N. Cohen,et al.  A pocket model for aluminum agglomeration in composite propellants , 1983 .

[8]  S. Seshadri,et al.  Electroless nickel-phosphorus coating on Ti and Al elemental powders , 2001 .

[9]  W. Eccleston,et al.  Mater. Res. Soc. Symp. Proc. , 2006 .

[10]  J. Loraud,et al.  Etude numérique et paramétrique de la combustion de particules d'aluminium , 1997 .

[11]  Shou-Yi Chang,et al.  Electroless nickel plating on SiC powder with hypophosphite as a reducing agent , 1996 .

[12]  S. Goroshin,et al.  Burning velocities in fuel-rich aluminum dust clouds , 1996 .

[13]  A. Gany,et al.  A Microscopic and Analytic Study of Aluminum Particles Agglomeration , 2001 .

[14]  J. Schoonman,et al.  Nanomaterials for Heterogeneous Combustion , 2004 .

[15]  V. A. Babuk,et al.  Propellant Formulation Factors and Metal Agglomeration in Combustion of Aluminized Solid Rocket Propellant , 2001 .

[16]  Kenneth K. Kuo,et al.  Challenges in Propellants and Combustion: 100 Years after Nobel. , 1997 .

[17]  E. Dreizin.  On the mechanism of asymmetric aluminum particle combustion , 1999 .

[18]  A. Varma,et al.  GASLESS COMBUSTION OF ALUMINUM PARTICLES CLAD BY NICKEL , 2001 .

[19]  S. Rashkovsky.  Metal agglomeration in solid propellants combustion. Part 1: Dynamical model of process , 1998 .

[20]  E. Dreizin.  Experimental study of stages in aluminium particle combustion in air , 1996 .