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Home Georgian Technologies Polymeric Composite Developed on the Base of Hybrid Fibers

Polymeric Composite Developed on the Base of Hybrid Fibers

Description

The composite with a matrix from epoxy resin and reinforcing structures from hybrid fibers (glass, carbon, basalt) is proposed. The possibility for partial replacement of high-strength and high-modulus carbon fiber by basalt one without a marked impairment of composite physical-mechanical properties is shown. Basalt fiber, used in the composite, is prepared from Georgian raw material and is characterized by low content of ferrous oxides and by moderate simplicity of the technology for its preparation. Boron carbide and basalt, as the strengtheners of polymeric matrix are used in the form of the powders, prepared by the technology, developed by us.

Composite is fabricated by autoclave method of molding, which is characterized by a number of advantages in comparison with other methods, in particular, with “wet” method, when an impregnation of reinforcing components and further molding of the material are carried out simultaneously. These advantages lie in the fact that at preliminary impregnation and fabrication of semi-finished product-prepreg the practically total wetting of the fiber by a binder and rigorous control of its content in the composite is possible.

Composite structure has been optimized, dedicated for special aims by fiber orientation relative to the axes of projected product. In Fig. 1 and 2 an example of composite structure and exterior view of the samples after mechanical testing are shown, respectively.

Innovative Aspect and Main Advantages

For example by optimization of composite structure and composition the materials with following physical-mechanical characteristics are prepared.

Composite N1: tension-ultimate strength (б) 120/80* MPa, elasticity modulus (E) 39/13 GPa, relative elongation (ε)1,1/1,4%, poisson's ratio (μ)0,43/0,23; bending – б 367/157 MPa, E 52/15 GPa; compression б 163/108 MPa; E 9,8/9,1 GPa; shift – б 7,5/5,0 MPa.

Composite N2: tension б 755/7 MPa; E 79/6 GPa; ε 0,99/0,42%; μ 0,35/0,02; bending – б 718/19 MPa; E 79/6 GPa; compression - б 451/109 MPA; E 106/9 GPa; shift – б 9,5/0,75 MPa
(Remark*: in numerator and denominator – values of the indexes lengthwise and crosswise of composite x–axis, respectively).

Composite endurance coefficient, determined by multicycle alternating given loading comprises 0,16....0,19. Hence the main innovation of technology lies in the fact at composite preparation the scarce and very expensive high-strength and high-modulus carbon fiber is partially replaced by high-strength and low-cost, minimum by an order, basalt fiber, leading to the decrease of the cost of finished product approximately by 30-40%.

Areas of Application

  • Renewable Energy and Energy conservation Technologies;
  • New Materials and Nanotechnology;
  • Aerospace;
  • Nuclear Energy and Safety.

The scheme of the arrangement of reinforcing elements in the matrix.

 

 

 

 

 

Fig.1. The scheme of the arrangement of reinforcing
elements in the matrix.

 

Composite samples after testing on tension
a)

Composite samples after testing on bending
b)

Fig. 2. Composite samples after testing on tension (a) and bending (b).

Stage of Development

Conceptual stage of the technology for fabrication of the material and the stage of development have been passed (fullscale laboratory testing were carried out). The analysis of technical feasibility was performed too, prototypes of material and products for testing were obtained. At present the procedure of patenting is carried out in Agency “Georgian Patent”. Agreement with Ltd “Elita” - with a potential partner in the topic of fabrication and realization of new production from basalt - , glass - , carbon plastic, among them are the blades of wind turbine was reached. Search for financial support for practical realization of this aim.

Contact Details

LPPL - G. Tsulukidze Mining Institute
Address: 7, Mindeli str. 0175 Tbilisi, Georgia
Contact person: Abashidze Guram
Tel./Fax: (+995 32) 32 4716; (/+995 32) 32 5990
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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