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Sintering of binderless cubic boron nitride and its modification by β-Si3N4 additive for hard machining applications

Bushlya, V. LU ; Petrusha, I. ; Gutnichenko, O. LU ; Osipov, O. ; M'Saoubi, R. LU ; Turkevich, V. LU and Ståhl, J. E. LU (2020) In International Journal of Refractory Metals and Hard Materials 86.
Abstract

This study present the results of HP-HT sintering, microstructure, properties, and performance of binderless cBN tool material. Within the investigated sintering temperature range of 1900–2600 °C the optimum was found to be 2200–2300 °C. Lower temperature results in incomplete diffusion bonding between cBN grains, while higher temperature results in high degree of recrystallization of initial structure, grain growth, and even formation of hexagonal boron nitride in triple joints. Introduction of stress-inducing β-Si3N4 minor inclusions resulted in high overall mechanical and thermal properties: HK = 41 GPa; KIC = 12.6 MPa·m1/2; λ = 180 W/(m·K). Machining experiments in roughing of hardened... (More)

This study present the results of HP-HT sintering, microstructure, properties, and performance of binderless cBN tool material. Within the investigated sintering temperature range of 1900–2600 °C the optimum was found to be 2200–2300 °C. Lower temperature results in incomplete diffusion bonding between cBN grains, while higher temperature results in high degree of recrystallization of initial structure, grain growth, and even formation of hexagonal boron nitride in triple joints. Introduction of stress-inducing β-Si3N4 minor inclusions resulted in high overall mechanical and thermal properties: HK = 41 GPa; KIC = 12.6 MPa·m1/2; λ = 180 W/(m·K). Machining experiments in roughing of hardened tool steels show that binderless cBN material provides high performance in terms of resistance to tool cratering, chipping, and tool fracture.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Binderless cBN, Hard machining, HP-HT sintering
in
International Journal of Refractory Metals and Hard Materials
volume
86
article number
105100
publisher
Elsevier
external identifiers
  • scopus:85073440890
ISSN
0263-4368
DOI
10.1016/j.ijrmhm.2019.105100
language
English
LU publication?
yes
id
2ce06576-6a84-463f-9dc8-f88de45cc848
date added to LUP
2019-10-25 10:47:03
date last changed
2020-01-13 02:28:48
@article{2ce06576-6a84-463f-9dc8-f88de45cc848,
  abstract     = {<p>This study present the results of HP-HT sintering, microstructure, properties, and performance of binderless cBN tool material. Within the investigated sintering temperature range of 1900–2600 °C the optimum was found to be 2200–2300 °C. Lower temperature results in incomplete diffusion bonding between cBN grains, while higher temperature results in high degree of recrystallization of initial structure, grain growth, and even formation of hexagonal boron nitride in triple joints. Introduction of stress-inducing β-Si<sub>3</sub>N<sub>4</sub> minor inclusions resulted in high overall mechanical and thermal properties: HK = 41 GPa; K<sub>IC</sub> = 12.6 MPa·m<sup>1/2</sup>; λ = 180 W/(m·K). Machining experiments in roughing of hardened tool steels show that binderless cBN material provides high performance in terms of resistance to tool cratering, chipping, and tool fracture.</p>},
  author       = {Bushlya, V. and Petrusha, I. and Gutnichenko, O. and Osipov, O. and M'Saoubi, R. and Turkevich, V. and Ståhl, J. E.},
  issn         = {0263-4368},
  language     = {eng},
  publisher    = {Elsevier},
  series       = {International Journal of Refractory Metals and Hard Materials},
  title        = {Sintering of binderless cubic boron nitride and its modification by β-Si<sub>3</sub>N<sub>4</sub> additive for hard machining applications},
  url          = {http://dx.doi.org/10.1016/j.ijrmhm.2019.105100},
  doi          = {10.1016/j.ijrmhm.2019.105100},
  volume       = {86},
  year         = {2020},
}