HIGH-TEMPERATURE THERMAL-INSULATION TIZOLIT ARTICLES
V. N. Khabarov
and A. V. Zuev
Translated from Novye Ogneupory, No. 4, pp. 82 – 85, April, 2010.
Original article submitted September 11, 2009.
High-temperature thermal insulation Tizolit articles made from mulit-silica fibers are reviewed. The basic
stages of the technology are discussed and the values of the physico-technical properties of the articles are pre
sented. The indicators of the properties of Tizolit articles are compared to articles produced by certain Russian
and foreign manufacturers of this type of product.
Keywords: mullite-silica fiber, thermal-insulation Tizolit articles, preforms, high-temperature clay
The Russian market for high-temperature thermal-insula
tion articles is developing along the lines of improvements in
the range of the product line, the indicators and stability of
the properties of the products, and an expansion of the deliv-
ery geography. The range of products produced by domestic
manufacturers is due chiefly to the availability of the Russian
natural resources base, the originality of scientific and tech-
nical designs, technical capabilities, and marketing policies.
Articles based on mullite-silica fiber have become very
common because of the combination of the physico-chem-
ical properties of the fibers and the high indicators of the
physico-technical properties of articles based on these fibers
. OOO NPTs Tizol has developed a technology and set up
the production of high-temperature thermal-insulation Tizolit
articles from mullite-silica fiber which are characterized by
maximally high indicators of the physico-technical proper
The creation of three-dimensional porous structures with
uniform distribution of the fibers and pores in the body is the
basic task that must be solved in order to create high-temper
ature thermal-insulation fiber articles. The target properties
of such articles are as follows: high operating temperature,
thermal stability, low thermal conductivity, and high relative
The production of Tizolit ariticles from mullite-silica fi
ber is based on deposition of fibers from aqueous suspen
sions containing inorganic binder compounds. The
dispersive medium wets and penetrates the surface of the fi-
bers, thus ensuring uniform distribution in the body and tend-
ing to increase the viscosity of the system. Volumetric pre-
forms are obtained by pouring the suspension into a matrix
of a metallic mesh. Molding is accomplished on specially de-
signed vacuum-forming machines. Degassing of the suspen-
sion accompanied by simultaneous top recompacting leads to
the formation of a crosslinked-schistose structure of the pre-
form in which the fibers themselves possess a binding effect.
The crude preforms are extracted from the matrix and
subjected to drying. The commercial form and target proper
ties of the article are acquired following high-temperature
roasting in electrical resistance furnaces. Thermal decompo
sition of the binder is accompanied by a decrease in the
weight of the article and release of gaseous products. Real
ization of the solid-phase reactions leads to the formation of
effective intra-fiber junctions in the course of roasting and
shrinkage along with the formation of the rigid fibrous
framework of the articles.
A protective coating 0.2 – 0.3 mm thick based on
electrocorundum, compounds that bonds chemically rigidly
to the body of the base material is deposited on the surface of
the articles in order to impart erosion-preventive properties
to the articles. The coatings have a maximal operating tem
perature of 1600°C and their apparent density is in the range
2500 – 2800 kg/m
Thermal-insulation paper and cardboard are manufac
tured according to paper production technology on standard
paper-making machines. The principal production operations
are the preparation of the suspension, creation of the paper
fabric, dehydration, drying, smoothing out, and winding of
Refractories and Industrial Ceramics Vol. 51, No. 2, 2010
1083-4877/10/5102-0079 © 2010 Springer Science+Business Media, Inc.
OOO NPTs Tirol, St. Petersburg, Russia.
GOUVPO St. Petersburg State Technological Institute (technical
university), St. Petersburg, Russia.