Page 11 - July-Aug 2018 web
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                                          FocusVSDu¨ykWth Q¨dl

  Electrolytic Polishing
        and Etching

     This table-top equipment is
 programmable, automatic and
 has provision of electrolytic
 polishing and etching of diverse
 varieties of metallic materials
 in a matter of just few minutes
 thereby cutting down the time of
 sample preparation drastically.
 Integrated chiller maintains the
 bath at -10 oC.

         Experimental Set-up for
    Determination of Fiber Volume
   Fraction for Composite Samples

     This test method determines constituent
 content of composite material which consists
 of matrix (resin) and reinforcement (C-fibre).
 The matrix is removed by hot acid digestion
 leaving the reinforcement essentially unaffected
 and the weight percent of the reinforcement is
 calculated. If the densities of both composite
 and reinforcement are known, the volume
 per cent or volume fraction is calculated. This is
 one of the parameters for the characterisation of
 composite materials.

         Determination of Open Porosity
                of Graphite Samples

     Refractory materials are used for demanding conditions
 and need to be sound, robust and capable. Material
 properties like density, porosity, permeability are
 indication of manufactured quality and during the service
 these properties influence strength, slag resistance, flow of
 gases and liquids, thermal conductivity and thermal shock
 resistance of the refractory. Understanding these properties
 and their interactions will help users to understand the
 performance of these materials better.

     Open porosity is the percentage of the total volume of
 the material occupied by both open and closed pores. Pore
 size and distribution in the carbon system are the keys to its
 performance particularly in a re-entry environment.

Material Development and Characterisation								 July-August 2018 11
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