1070-4272/01/7410-1762 $25.00 C 2001 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 74, No. 10, 2001, pp. 1762!1764. Translated from Zhurnal Prikladnoi Khimii, Vol. 74, No. 10, 2001,
Original Russian Text Copyright + 2001 by Bairamov, Ermakov, Vedernikova.
Effect of Some Organic Compounds on Composition of Products
of Spark Dispersion of Aluminum
R. K. Bairamov, A. I. Ermakov, and N. R. Vedernikova
Novomoskovsk Institute of Mendeleev Russian University of Chemical Technology, Novomoskovsk, Russia
Olimpiya OOO, Novomoskovsk, Russia
Received May 10, 2001
Abstract-The influence exerted by the nature of organic components of the working solution on the com-
position of products formed in spark dispersion of aluminum was studied.
In spark erosion of aluminum, the interaction of
the forming dispersed metal particles with the work-
ing solution depends on the process conditions [1, 2].
The reaction products are bayerite, boehmite, and
aluminum powder. The fact that mainly aluminum
powder is obtained in the process is due to the for-
mation of an oxide film on the surface of dispersed
particles. The film formation may involve oxygen
produced together with other elements in the decom-
position of working solution components in the elec-
tric spark discharge zone. The possibility of occur-
rence of such a reaction is indicated by data obtained
in studying the spark erosion of a metal in a working
solution containing organic compounds (e.g., niobium
in the presence of heptane etc.), in which metal car-
bides are formed together with the metal powder .
The carbides are products of the reaction of dispersed
particles with carbon formed in destruction of organic
compounds in the course of spark erosion.
This study is concerned with the influence exerted
on spark erosion of aluminum by a number of organic
compounds added to the working solution (distilled
water). The experiments were carried out on an instal-
lation similar to that described in .
Figure 1 shows the results of a study of the effect
of sludge treatment temperature (a) and concentration
of introduced organic compounds (b) on the com-
position of the obtained products. It can be seen that
the content of boehmite in erosion products obtained
in the working solution and solutions containing or-
ganic components grows with increasing sludge treat-
ment temperature. The thermal treatment of the sludge
was carried out outside the spark-discharge zone (out-
side the reactor in the collector vessel) . At the
same time, approximately constant sludge temperature
within the reactor (<40oC) was ensured by controlling
Fig. 1. Content w of (133) boehmite and (1'33') bayerite
in products of spark dispersion of aluminum vs. (a) tem-
perature T of sludge treatment and (b) concentration C
of organic substance in the working solution. (a) Additive
concentration (M): (1, 1')0,(2,2') 0,05, and (3, 3') 0,039.
(b) Sludge treatment temperature 90oC. Additive: (a) (2, 2')
ethanol, (3, 3') ammonium acetate; (b) (1, 1') saccharose,
(2, 2') glycerol, and (3, 3') ethanol. Sludge treatment time
t (h): (a) (1, 1') 15, (2, 2') 12, (3, 3') 8; (b) (1, 1') 15,
(2, 2') 9, and (3, 3') 12.