Propellant grade ultrafine aluminum powder by RF induction plasma

2018 ◽  
Vol 29 (3) ◽  
pp. 804-812 ◽  
Author(s):  
P. Sai Karthik ◽  
S.B. Chandrasekhar ◽  
D. Chakravarty ◽  
P.V.V. Srinivas ◽  
V.S.K. Chakravadhanula ◽  
...  
Author(s):  
В.О. Попов ◽  
В.Н. Комов ◽  
Е.М. Попенко ◽  
А.В. Сергиенко

Данная статья посвящена исследованию влияния пористости прессованных таблеток из сверхтонкого порошка алюминия (СТП Al). Определен механизм горения, протекающий в две стадии: первая, медленная, включающая в себя как «кольцевое» горение боковой поверхности, так и параллельное горение концентрическими слоями, вторая стадия объемная, сопровождающаяся резким самопроизвольным увеличением температуры горения и интенсивности свечения. Показано, что увеличение плотности упаковки СТП Al позволяет замедлить процесс окисления алюминия более чем в два раза. Это обусловлено снижением газопроницаемости таблетки и затруднением доступа воздуха вглубь образца. Повышение пористости материала позволяет регулировать процесс нитридообразования за счёт увеличения содержания азота в продуктах при фильтрационном механизме горения, что открывает возможности получения тугоплавких материалов. This article is devoted to the study of the effect of porosity of compressed tablets from ultrafine aluminum powder (STP Al). The combustion mechanism was determined, which proceeds in two stages: the first, slow, which includes both "ring" combustion of the side surface and parallel combustion with concentric layers, the second stage is volumetric, accompanied by a sharp spontaneous increase in the combustion temperature and glow intensity. It has been shown that an increase in the packing density of HFC Al makes it possible to slow down the process of aluminum oxidation by more than two times. This is due to a decrease in the gas permeability of the tablet and the difficulty of air access deep into the sample. An increase in the porosity of the material makes it possible to regulate the process of nitride formation by increasing the nitrogen content in the products during the filtration mechanism of combustion, which opens up the possibility of obtaining refractory materials.


2011 ◽  
Vol 23 (12) ◽  
pp. 3353-3357
Author(s):  
古忠涛 Gu Zhongtao ◽  
叶高英 Ye Gaoying ◽  
金玉萍 Jin Yuping

2000 ◽  
Vol 36 (5) ◽  
pp. 433-437 ◽  
Author(s):  
H. Nishiyama ◽  
Takehiko Sato ◽  
S. Ito ◽  
Takeshi Sato ◽  
S. Kamiyama

1998 ◽  
Vol 41 (2) ◽  
pp. 502-510 ◽  
Author(s):  
Hideya NISHIYAMA ◽  
Norihiro FUKAI ◽  
Shinichi KAMIYAMA

Author(s):  
K. Mailhot ◽  
F. Gitzhofer ◽  
M.I. Boulos

Abstract In this paper, supersonic RF induction plasma deposition of Yttria Stabilized Zirconia (YSZ) has been developed in order to produce dense solid electrolyte membranes for Solid Oxide Fuel Cells (SOFC). Different RF induction plasma torch configurations were tested. The results show that high density layers could be obtained using a supersonic Laval nozzle integrated on a standard torch. 50 to 100 um YSZ coatings with porosity of near 1% could be obtained using this technique at relatively high deposition rates (10g/min.). Attention has been given to the thin coating porosity measurement by using a proper calibration and back scattered electron micrographs of the deposit cross-section coupled with image analysis. Absolute porosity has been measured by using this technique described in another paper of the same conference.


2012 ◽  
Vol 24 (6) ◽  
pp. 1409-1413
Author(s):  
古忠涛 Gu Zhongtao ◽  
叶高英 Ye Gaoying ◽  
金玉萍 Jin Yuping

Sign in / Sign up

Export Citation Format

Share Document