DEVELOPMENT STAGES AND INTRODUCTION
INTO SERIES PRODUCTION OF A QUASI-ISOSTATIC
M. I. Timokhova
Translated from Novye Ogneupory, No. 10, pp. 20 – 24, October 2009.
Original article submitted March 5, 2009.
Results are provided for introduction of a bulk compaction method for compaction of a broad range of ceramic
refractory objects. The method provides high object quality, it is highly productive, submitting to complete
mechanisation and automation. The new method is the most economic of all isostatic and static compaction
Keywords: technology, introduction, series production, saggers, rings, grinding balls, pipes, press-powder, at
omizing dryer, powder materials, quasi-isostatic compaction, objects, mechanization, assimilation of
The quasi-isostatic compaction method was worked out
during development of the isostatic compaction method, and
it is a simplified version of it. By providing volumetric com-
pression of pressed material the quasi-isostatic compaction
method makes it possible to prepare compacted objects with
a density of 94 – 95% of theoretical.
Quasi-isostatic compaction is the most economic method
of all known compaction methods. In articles [1 – 4] its ad
vantages are considered in producing ceramic and refractory
objects. In subsequent publications theoretical and practical
bases for quasi-isostatic compaction and the theory of de
signing the overall dimensions of elastic compaction ele
ments are provided. Recommendations for the configuration
of pressing elements of different compaction schemes and
the ratios of their dimensions are given .
The kinetics of elastic compaction of elements and their
dimensions for different compaction schemes have been con
sidered in . Mold constructions have been described pro
viding features of the quasi-isostatic compaction mold have
been give, providing volumetric compaction of objects of
powder materials and waste-free technology for producing
them. Recommendations have been made for these molds
compared with static compaction molds .
A simple solution for vibration of both the pressed pow
der, poured into a mold, and also the process of vibration
compaction of objects have been described [6, 8].
Development of quasi-isostatic compaction started by us
in 1964 with a search for pressing materials and the creation
of mold construction. Preliminary development of the theory
of this process was necessary and the kinetics were studied
for plastic pressing elements with increasing compaction
pressure and removal. A study of these questions made it
possible under test plant conditions to perform fundamental
development of the process and to create operational molds,
whose repeated adjustment made it possible to accomplish
compaction of objects without breakage.
Simultaneously considerable attention was devoted to
the choice of production plastifying binder for nonplastic ce
ramic materials. A study of 25 compositions of organic
plastifiers was carried out, as a result of which the optimum
polyvinyl glycerine binder was selected providing good
compaction capacity of pressed powders of all compositions
of ceramic materials used by us in the production of objects
by both quasi-isostatic and static compaction methods.
In 1968 the technology for producing vacuum-tight rings
with a diameter of 250 and a thickness of 90 and 130 mm,
and then other standard sizes were introduced into the test
plant, that over several years accomplished the supply of ob
jects to enterprises of the electronic industry. Objects have
high physicomechanical and electrical properties, and they
have been awarded the highest quality category. This has
made it possible for enterprises of the electronic industry to
develop a series of instruments of considerable power ex
ceeding in properties all known domestic and overseas
Refractories and Industrial Ceramics Vol. 50, No. 5, 2009
1083-4877/09/5005-0340 © 2009 Springer Science+Business Media, Inc.