Header menu link for other important links
X
Development and quality assessment of multi-point brazed diamond dressers produced by active brazing under high vacuum
Prithviraj Mukhopadhyay,
Published in Springer London
2018
Volume: 99
   
Issue: 1-4
Pages: 647 - 662
Abstract
In the current work, multipoint single layer brazed diamond dressers were indigenously developed by high vacuum brazing technology using Ni-Cr and Ag-Cu-2Ti alloy. The vacuum level was maintained in the range of 10 −6 –10 −7 mbar. To assess the quality, the developed dressers were subjected to eight dressing cycles with increasing grit penetration depth. The Ag-Cu-2Ti alloy, possessing a lower liquidus temperature of 820 °C, showed a superior grit retention ability compared to Ni-Cr alloy, having a higher liquidus temperature of 1050 °C. Higher thermal residual stresses developed in the case of Ni-Cr alloy, due to higher brazing temperature and difference in Young’s moduli and the coefficient of thermal expansion of the diamond grit, filler alloy, unfavorably led to the premature bond level failure of brazed diamond grit under lower specific loads. Elevated brazing temperature and formation of unfavorable intermetallic phases were found impairing the effectiveness of Ni-Cr alloy and caused severe graphitization of diamond. On the other hand, the silver-based bond experienced a potential threat of rapid wear by the hard bond-abrasive system of the grinding wheel during dressing. Localized “scooping” of bond material was observed in Ag-based bond layer securing diamond grits. Through a separate pin-on-disc test, it was demonstrated that this alloy received a substantial wear rate of 3.364 mm 3 /min and exhibited deterioration of frictional behavior, despite the presence of silver. The Ag-Cu-2Ti alloy with lower brazing temperature and lower tendency of graphitization has otherwise a more promising scope but only if the composition is suitably altered to bring in significantly higher abrasion resistance in its mechanical characteristics. © Springer-Verlag London Ltd., part of Springer Nature 2018.
About the journal
JournalData powered by TypesetInternational Journal of Advanced Manufacturing Technology
PublisherData powered by TypesetSpringer London
ISSN02683768
Open AccessNo
Concepts (26)
  •  related image
    Abrasives
  •  related image
    Binary alloys
  •  related image
    Bond strength (materials)
  •  related image
    Brazing
  •  related image
    Copper alloys
  •  related image
    Diamonds
  •  related image
    Graphite
  •  related image
    Graphitization
  •  related image
    Mechanical properties
  •  related image
    Microstructure
  •  related image
    Nickel alloys
  •  related image
    Silver alloys
  •  related image
    Ternary alloys
  •  related image
    Thermal expansion
  •  related image
    Titanium alloys
  •  related image
    VACUUM BRAZING
  •  related image
    Wear of materials
  •  related image
    ABRASIVE RESISTANCE
  •  related image
    ACTIVE BRAZING
  •  related image
    GRAPHITIZATION OF DIAMONDS
  •  related image
    Intermetallic phasis
  •  related image
    LIQUIDUS TEMPERATURE
  •  related image
    MECHANICAL CHARACTERISTICS
  •  related image
    MULTI-POINTS
  •  related image
    THERMAL RESIDUAL STRESS
  •  related image
    Chromium alloys