Cutting performance improvement of Si3N4 ceramic cutting tools by adding boride |
| |
| Authors: | Sheng-Jin He Si-Chun Luo Wei-Ming Guo Wan-Xin Wei Hua-Tay Lin |
| |
| Affiliation: | 1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, China;2. School of Mechanical and Electronic Engineering, Pingxiang University, Pingxiang, China;3. Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, China |
| |
| Abstract: | Cutting performances of silicon nitride (Si3N4) ceramic cutting tools with and without boride additive (2.5 vol% ZrB2 or TiB2) prepared by hot-pressing at 1500°C were investigated. Due to the α- to β-Si3N4 phase transformation and low densification temperature, boride-containing Si3N4 ceramics with high hardness and high toughness were obtained. The turning tests showed that the effective cutting lengths of the Si3N4–2.5 vol% TiB2 ceramic (～2480 m) and Si3N4–2.5 vol% ZrB2 ceramic (～2200 m) were higher than the monolithic Si3N4 ceramic (～1780 m). As the toughness was improved while maintaining relative high hardness, the cutting performances of the boride-containing Si3N4-based inserts were improved by adding 2.5 vol% ZrB2 or TiB2. The improved cutting performance indicated that the boride-containing Si3N4 ceramics are expected to be used in the field of ceramic cutting tools. |
| |
| Keywords: | cutting performance cutting tools mechanical properties silicon nitride wear mechanism |
|
|
