Paper Title:
Use of Electric Discharge Sintering for Elaboration of Diamond Tools
  Abstract

A number of installations for electric discharge sintering of powder materials is developed. There are installations in which energy is delivered by following currents: 1) superposition of the direct and alternating (with frequency up 7900 Hz) currents, 2) alternating current (50 Hz). The sintering is carried out in conductive (graphite) moulds. The sintering is often done in thermal and electric insulator moulds (for example, ceramic on Si3N4 base, asbestos cement). At sintering of metal-diamond composition in insulator moulds metallic electrodespunches (steel) are used. Such a variant of sintering allows one its duration to short from ~900 s down to ~60–150 s. This ensures complete safety of dimensions and operating characteristics of diamond grains. The technologies of various diamond elements for tools for treatment of glasses and soft stones (stone saws, tools in forms of tablets, rings). The preliminary pressure which is applied to powder sample simultaneously with current was equal to ~10 MPa (~100 kg/cm2). The end pressure was equal to ~100 MPa (~1000 kg/cm2). The current density was equal to ~700– 1200 A/cm2. Tests of diamond tablets (diamond 20/14 mkm, binder 80 % Cu+20 % Sn) at grinding of glass had shown: the abrasivity of tablets with common diamonds is equal to ~50 g/(cm2 min), and abrasivity in case with diamonds annealed in hydrogen is equal to ~70 g/(cm2 min).

  Info
Periodical
Edited by
P. VINCENZINI and E. CAPPELLI
Pages
127-132
DOI
10.4028/www.scientific.net/AST.48.127
Citation
O.I. Raychenko, T.I. Istomina, R.O. Morozova, I.A. Morozov, O.V. Derev'yanko, "Use of Electric Discharge Sintering for Elaboration of Diamond Tools", Advances in Science and Technology, Vol. 48, pp. 127-132, 2006
Online since
October 2006
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Qin He Zhang, Jian Hua Zhang, J.H. Cheng, C.Q. Zhang, Sheng Feng Ren
406
Authors: Janusz Konstanty
Abstract:The methods of making diamond tools have undergone a fantastic development since the invention of the synthetic diamond in the mid-1950’s....
1121
Authors: Luciano José de Oliveira, Marcello Filgueira
Abstract:This work deals with the use of Fe-Cu alloys for use as matrix for diamonds in cutting tools. In this case it was processed diamond beads...
241
Authors: Bai Yang Lou, Pei Hua Li, Le Guo Li
Abstract:The main causes of segment failure of diamond saw blade are studied in this paper. The segment material, the microstructure and the wear...
1616
Authors: Guerold Sergueevitch Bobrovinitchii, Marcello Filgueira, Sérgio Neves Monteiro, Rômulo Crespo Tardim
Abstract:Powder metallurgy-based technologies of saw blades production for stone cutting normally uses cobalt as binder agent. Cobalt was chosen for...
182