Zvuk Co.

Developing of means and tehniques of nondestructive test

devices NDT
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Principle of action
Application of equipment


Method of natural oscillation
Test of abrasive materials

Application of "Zvuk" equipment

Test of abrasive articles.
 Type “Zvuk” equipment is used for the control of physicomechanical characteristics (hardness) of abrasive articles of the widest range of sizes from 3 up to 1200 mm, allowing practically instantly to receive a final result of test.
 Advantage of devices such as "Zvuk" in comparison with the device "Grindo Sonic" consists in the opportunity of test of the small-sized tool, cutting wheels, as well as simplicity and convenience in operation.

Test of refractory.
 For refractory articles there is a correlative dependence between the sound velocity Cl, measured by devices “Zvuk”, and such parameters, as the open porosity, apparent density and strength.

Test of building materials
  For construction articles correlation interdependence between Cl and strength characteristics of articles made of concrete, various kinds of brick, pavement tiles and etc. is established, that operatively allows to estimate variation of strength characteristics of the articles in one set.

Test of carbon products.
  “Zvuk” devices find application at the target test of physicomechanical properties of carbon articles: hearth-level blocks of baths of electrolyzers, electrographited electrodes used in the course of manufacture of aluminum and other metals.

Test of cast iron blanks.

  For cast iron parts there are correlation interdependences between sound velocity Ńl and such important parameters as Brinnell hardness, strength characteristics, composition of spherical graphite. Application of a method of NOF measuring “Zvuk” devices has enabled on-the-fly to identify these parameters on blanks of rings of electric stoves, parts of power units: clutch plates, flywheels etc. prior to their machining.

Test of articles made of high-strength ceramics and synthetic highly hard materials.
  Correlation dependences between elastic characteristics (velocity Ńl, Poison’s ratio) and hardness, density, as well as operational parameters (wear resistance and strength characteristics) of articles are established. It is possible to test ceramic articles from materials on the basis of corundum, silicon carbide, boron carbide, cubic boron nitride etc. with various additives which are used for manufacturing cutting plates, wearproof parts, elements of organoceramic armour and coverings etc.

Test of elastic constants of materials.

  Type “Zvuk” devices have full metrological software and can be used for determination of elastic constants: Young’s modulus, Poison’s ratio and other parameters describing elastic characteristics of various materials. Devices also can be used for determination of elastic constants of ceramic articles according to the USA standard of ASTM C1259-94.

Defectoscopy of articles.
  The acoustic test based on NOF measuring, provides an integrated evaluation of all volume of an article. However, normally presence of defects and infringements in structures uniformity of an article results in downturn of NOF and appropriate Ńl value, that is lower than some predetermined value, and in change of NOF spectrum, i.e. change of a ratio between NOF of different modes of oscillations. These circumstances in some cases make it possible to find out the specified infringements. Such work with positive results was carried out to detect occurrence of defects of structure of carbon articles at various stages of technological process of their manufacturing, as well as to detect various sort of defects in cast iron casts such as “cap of isolator”. For some types graphitized carbon and ceramic articles the change of NOF values is revealed under repeated cyclic thermo-load, that shows an opportunity of use of results of the test for an estimation of article resource with the purpose of its duly withdrawal from operation and prevention of emergency situations.

© Zvuk Co. 2003-2007 ă.