Fabrication of Composite Blocks Containing Alumina Bubble Particles for Porous CBN Abrasive Wheels

Abstract:

Alumina (Al2O3) bubble particles were added into the mixture of CBN abrasive grains, Cu-Sn-Ti alloy and graphite particles to prepare the composite blocks for porous CBN abrasive wheels. The specimens were sintered at the temperature of 920°C for the dwell time of 30 min. The bending strength of the composite blocks was measured by the three-point bending tests. The fracture surface of the blocks was characterized. The results show that, the content of alumina bubble particles does not take significant effect on the mechanical strength of the composite blocks. Even the lowest strength of the composite blocks, 98 MPa, is higher than that of the vitrified CBN abra-sive wheels. Cu-Sn-Ti alloy has bonded firmly alumina particles and CBN grains by means of the chemical reaction and corresponding products. Finally, the chip space was formed through the re-moval of the ceramic wall of the alumina bubble particles within the CBN abrasive wheel during dressing.

• Periodical: Key Engineering Materials (Volume 499)
• Pages: 229-234
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.499.229
• Online since: January 2012
• Authors: Q. Pan, Wen Feng Ding, Jiu Hua Xu, B. Zhang, H.H. Su, Y.C. Fu
• Keywords: Alumina Bubble Particles, CBN Grain, Composite Block, Porous Abrasive Wheels

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