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| Elliptic Ultrasonic Assisted Fixed-Abrasive Polishing of AlN Ceramics |
| LI Gengzhuo, WU Yongbo, WANG Qiang |
| Southern University of Science and Technology, Shenzhen 518055, China |
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Abstract AlN ceramics are considered as the most ideal substrate material for high integration and high-power devices packaging due to its high thermal conductivity, low thermal expansion coefficient and good mechanical strength, and have great prospects for application in automotive chips, aerospace and defense military. However, as the primary methods of the substrate planarization, lapping and polishing of AlN ceramics are encountering the bottleneck of low processing efficiency caused by the employment of loose abrasive slurries. In addition, the chemicals in abrasive slurries can cause increased environmental expenses. In this research, for the purpose of solving environmental problems and improving the polishing efficiency of AlN ceramics, a vitrified-bonded abrasive pellet containing fine abrasives is employed to realize the fixed-abrasive dry polishing. With this method, higher material removal rate can be obtained, but the chip cannot be discharged in time during the dry machining, which will lead to the deterioration of surface integrity. Consequently, an elliptic ultrasonic vibration is applied to the abrasive pellet during the dry polishing. It is found from experiments that the elliptic ultrasonic vibration has a catalytic effect on the chip emission, which is more favourable for better surface quality and higher material removal rate.
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2022, 
