SURVEY OF RUSSIAN FEDERATION PATENTS ON REFRACTORIES
Survey prepared by Zh. N. Demidova
Translated from Novye Ogneupory, No. 4, pp. 78 – 79, April, 2008,
and No. 5, pp. 59 – 60, May, 2008.
A METHOD OF MAKING
A FIBROUS-STRUCTURE CERAMIC FILTER
B. L. Krasnyi, V. P. Tarasovskii, and T. S. Marinina
RU Patent 2288903
IPC C04B 35/80
The method of making a ceramic filter with fibrous
structure includes dispersing the ceramic fibers to a given
L/d, preparing a suspension of the ceramic fibers, polymer
binder, and ceramic bonding agent, deposition, drying, and
firing. The method differs in that the dispersal is performed
in the presence of a surface-active substance; to prepare the
suspension, one makes a mixture of Bingham liquids
containing the polymer binder of film type and the ceramic
bonding agent; to that liquid mixture one adds the fibers;
homogenization with shearing stresses is used, and then the
suspension is deposited by filtering it under vacuum through
a hollow water-permeable mold, in shape and size cor
responding to the hollow internal volume of the ceramic
filtering element, with a given angle for the vector for the
motion of the suspension relative to the filtration surface; the
blank is dried to remove the residual liquid; and the firing is
done at the temperature of formation for the crystalline
phases of a given chemical composition in the ceramic
binding agent, but below the recrystallization temperature for
the fiber material.
The fibers can be provided by technological wastes from
the manufacture of basalt, quartz, and kaolin fibers, and also
acicular single crystals of zirconium dioxide, aluminum
oxide, or mixtures of them. The surfactant may consist of
fatty acids from the following series: oleic, stearic, linolenic,
linoleic, palmitic, arachidonic, or mixtures of them with
contents from 0.5 to 1.5 wt.% of the fiber mass. A polymer
bonding agent of film type may be provided by polyvinyl
alcohol or polyvinylbutyral in amounts from 1.5 to 6 wt.% of
the fiber mass.
As the ceramic binding agent, one can use ortho
phosphoric acid, aluminum phosphate, magnesium phosphate,
aluminum-magnesium phosphate, aluminum-boron phosphate,
or mixtures of them in amounts from 3 to 8 wt.% of the fiber
mass. The Bingham liquids have dynamic viscosity
35 – 50 Pa·sec. The deposition is performed with an angle
for the motion vector of the suspension flow relative to the
surface of the filtration varying from 0 to 90°. The blank is
dried to remove the residual liquid in the mold by blowing
with air at 60 – 100°C.
Bulletin Inventions: Utility Models
, No. 34, 206 (2006).
A STEEL-POURING LADLE
A. S. Lavrov, Yu. I. Larin, S. A. Lavrov, V. D. Lavrent’ev,
V. I. Lebedev, A. V. Yaroshenko, and B. N. Tonkikh
RU Patent 2296647
IPC B22D 41/00
The steel-pouring ladle has a metal jacket with lining of
the side wall and bottom with shaped bricks established in
the bottom of the ladle with displacement relative to the
diametral axis of it, together with shutter gates equipped with
refractory inserts set at the bottom of the ladle symmetrically
with respect to the pouring vessels up to the side wall of the
ladle at the bottom and at the sides. The distance m between
the side walls of the insert at the point of contact with the
side wall of the ladle is (0.15 – 0.40)D; the length l of the
side walls of the insert is (0.2 – 0.4)D, where D is the
diameter of the bottom of the ladle in the working cavity; the
height of the side walls of an insert is 0.05 – 0.09 of the
height of the working cavity in the ladle; the bottom of the
insert is inclined at an angle a of 2 – 10° to the bottom of the
ladle towards the center, while the side walls of the insert are
set at angle b of 5 – 15° to the diametral plane of the ladle.
Bulletin, No. 10, 384 (2007).
Refractories and Industrial Ceramics Vol. 49, No. 3, 2008
1083-4877/08/4903-0235 © 2008 Springer Science+Business Media, Inc.
Intermet Engineering Corporation, Russia.
Subsequently we use the abbreviated name Bulletin.