Improvement in Quality of PCB-drills Made of Micro-grained Cemented Carbide by Using Continuous Sinter-HIP Equipment

Abstract

Recently, the demand for drills for printed circuit boards (PCB-drills) has increased with the growth of the electronics industry. WC-Co alloys with relatively fine grain size have been put to industrial use, but the drills are now required to have more and more excellent wear and breaking resistance, as PCB has come to have a higher density. For that reason, micro-grained cemented carbide has become to be of great importance. In such circumstances, new micro-grained grades (MD10, MD20 and MD30) specially designed for PCB-drills have been developed, and the mass production of PCB-drill blanks having a stable high quality and reliability has been available through the use of a continuous Sinter-HIP equipment.