Paper Title:
Defect Structures in Diamond Composite Coated Cemented Tungsten CarbideSubstrates
  Abstract

Variability in the abrasive wear of PCD coatings on cemented WC substrates has been investigated. Six samples of PCD coated carbides were tested in a wear testing rig. The PCD coated element was used to turn an industry standard vitrified bonded corundum grinding wheel. The wear rate was measured as the weight loss of the cutting element per cubic metre of grinding wheel machined during the test. Two grades of cutting elements were observed. One grade had wear rates between 6 and 7.3 g/m³ but of the three poor quality samples, only one valid test was made realising wear rate of ~7,800 g/m³. The microstructures of the samples were studied using SEM, X-ray imaging, neutron diffraction and XRD. SEM images revealed differences in the volume percentage of diamonds in the two grades and the XRD scans highlighted the variable distribution of the diamond phase in the coating. Estimates of the residual stresses in a good and poor quality samples indicated significantly higher compressive stresses in the good quality versus poor quality coating. These results have revealed two extremes in the wear rates of these PCD coated carbides. It is suggested that the difference in diamond content between the two grades is not sufficient to account for the 3 orders-of-magnitude difference in the observed wear rates. However, the presence of intrusive veins of carbide material in the coatings, especially around the curved cutting tip, suggested that the macroscopic defects observed in the x-ray and SEM images were the major cause of the high wear rates in the poor quality sample.

  Info
Periodical
Chapter
Chapter 2: Turning, Milling and Drilling
Edited by
Taghi Tawakoli
Pages
339-344
DOI
10.4028/www.scientific.net/AMR.325.339
Citation
J. N. Boland, X. S. Li, D. Hay, C. M. MacRae, S. Elbracht, R. P. Rassool, V. Luzin, P. Imperia, "Defect Structures in Diamond Composite Coated Cemented Tungsten CarbideSubstrates", Advanced Materials Research, Vol. 325, pp. 339-344, 2011
Online since
August 2011
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: Li Gou, Ji Lei Zhu, Jun Guo Ran, Suang Feng Yan
Abstract:In order to improve the adhesion between diamond coatings and cemented tungsten carbide (WC-Co) substrates, the diamond coatings were...
1889
Authors: Murat Aydın, L.S. Ozyegin, Faik N. Oktar, E.Z. Erkmen, O. Anzabi, Kārlis A. Gross
Abstract:In order to overcome the fragility and to improve the physical stability of hydroxyapatite (HA) on the implant, 5, 10, and 15 % yttria...
631
Authors: G. Deniz, Saduman Sen, Ugur Sen
Abstract:In this work, some surface properties of AISI M2 steel were improved by a thermoreactive deposition process. Gas nitriding was realized on...
219
Authors: Xin Bo Xiong, Xie Rong Zeng, Chun Li Zhou
Abstract:Calcium phosphate coatings were deposited on H2O2-treated carbon/carbon composites by ultrasonicated induction heating (UIH) method under...
1763
Authors: X.Y. Wang, S.Q. Pang, Q.X. Yu
Abstract:The aim of this work is to investigate the machinability of new coated carbide cutting tools that are named C7 plus coatings under turning of...
173