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International Innovation and technological cooperation
REPORT
STRUCTURE OF ENGINEERING
NANOCOMPOSITE FLUORINATED
MATERIALS, PRODUCTION
TECHNOLOGIES.
Lecturer:
SAROKIN VALERY
Y. Kupala State University, Grodno, Belarus.
Abstract
Influence of technological modes of
formation on characteristics of composite
materials
on
a
basis
polytetrafluoroethylene, modified carbon
fillings is investigated. Efficiency of a way
of formation of half-finished products in
the
conditions
of
the
all-round
compression
allowing
essentially
reducing a work cycle is shown and to
provide effect increases durability and
tribotechnical characteristics.
1. Introduction
Fluor
plastics
and
fluorine-containing
composites are among the most widespread
polymeric materials used for the manufacture of
sealants and tribological products for static and
mobile units with high technical requirements.
However depending on operating conditions,
required resources, security settings can be used in
products such as the basic polymer, particularly,
polytetrafluoroethylene (PTFE) and of the
compositions on their base, containing dispersed
and fibrous fillers, modifiers, and functional
additives of various composition, production
technology and size.
The purpose of this study was to assess
the feasibility of improving the efficiency of
technological processes used in the present,
the technology of composites based on
PTFE.
2. Materials and methods of research
For
research
use
industrially
produced
polymer
materials - polytetrafluoroethylene F-4 (Flubon) with a particle
size less than 150 microns in the state of industrial supplies. For
the modification of the polymer matrix using different grades of
carbon and graphite fibers.
Composite materials have received and processed into
products by conventional methods, including the operations of
mixing, cold pressing of blanks followed by sintering
(monolithization) at temperatures of 350-370В°C using a specialized
process equipment. The charge state of the modifiers was
evaluated from the spectra of thermally stimulated current (TSC)
by heating the sample between the isolated electrodes.
Tribotechnical characteristics of fluorinated materials and
coatings were determined on a friction machine according to the
schemes testing "shaft - partial liner" and "finger - disc".
3. Results of research and discussion
Among the most effective methods to improve the
indices of service characteristics of composite materials
of different composition are mechanical-chemical
(tribochemical), which are based on the managed
interaction of components in the processes of grinding,
mixing, processing and exploitation. It is established
that mechanochemical technology is also effective in
obtaining composite materials based on PTFE. The
main method of their implementation is mechanical
activation by mixing the components in the mixer blade
or anchor-type with adjustable parameters of impact of
elements on a powdered mixture.
Scheme of the total manufacturing cycle of products
of fluorine-containing composites "Flubon" type
presented in Fig. 1.
Fig. 1. Scheme mode of formation of composite materials such as "Flubon"
To assess the influence of forming parameters on the
characteristics of products of fluorine-containing composite
"Flubon-20" model samples produced under various
technological regimes (Fig. 2).
a
b
c
Fig. 2. Technological
scheme for forming
samples of the material
type
"Flubon"
by
optimized cycle
d
e
The experimental results
show the decisive role of the
contact process at the "matrixfiller"
interface
in
the
mechanism monolithization of
composites formed by various
technological schemes.
Results of physical mechanical (index Пѓt) and tribological
characteristics (index Iп‚ґ107) testing are presented in Fig. 3 and 4.
43
45
rupture strength, MPa
40
40,8
44,85
44,85
36
Fig.
3.
Physical
and
mechanical properties of
composites
such
as
"Flubon", formed by various
technological modes
35
30
25
20
17
15
10
5
0
Standart Mode в„–1 Mode в„–2 Mode в„–3 Mode в„–4 Mode в„–5
technology
3,5
3,5
3
Wear (IГ—107)
Fig.
4.
Durability
of
composites
such
as
"Flubon", formed by various
technological modes
2,4
2,5
1,81
2
1,5
1,3
1
0,5
0
0,43
0,51
Standart Mode в„–1 Mode в„–2 Mode в„–3 Mode в„–4 Mode в„–5
technology
4. Conclusion
The technology of forming articles made of
composite
materials
based
on
polytetrafluoroethylene by reduced technological
process, ensuring higher rates of physical
mechanical and tribological characteristics is
developed.
The developed technology for forming
tribological and sealing products of fluorinecontaining composites implemented at Grodno
Mechanical Plant in accordance with the
normative documentation and is protected by a
series of patents for inventions.
Thank you for your
attention!
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