| Autor: |
Elgazzar A; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.; Mechanical Engineering Department, Faculty of Engineering at Shoubra, Benha University, Cairo 11629, Egypt., Zhou SJ; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China., Ouyang JH; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China., Peng ZJ; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China., Yao JT; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China., Liu ZG; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China., Wang YJ; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China., Wang YM; School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China. |
| Abstrakt: |
Development of high-performance cutting tool materials is one of the critical parameters enhancing the surface finishing of high-speed machined products. Ti(C,N)-based cermets reinforced with and without different contents of silicon nitride were designed and evaluated to satisfy the requirements. In fact, the effect of silicon nitride addition to Ti(C,N)-based cermet remains unclear. The purpose of this study is to investigate the influence of Si 3 N 4 additive on microstructure, mechanical properties, and thermal stability of Ti(C,N)-based cermet cutting tools. In the present work, α-Si 3 N 4 "grade SN-E10" was utilized with various fractions up to 6 wt.% in the designed cermets. A two-step reactive sintering process under vacuum was carried out for the green compact of Ti(C,N)-based cermet samples. The samples with 4 wt.% Si 3 N 4 have an apparent solid density of about 6.75 g/cm 3 (relative density of about 98 %); however, the cermet samples with 2 wt.% Si 3 N 4 exhibit a superior fracture toughness of 10.82 MPa.m1/2 and a traverse rupture strength of 1425.8 MPa. With an increase in the contents of Si 3 N 4 , the Vickers hardness and fracture toughness of Ti(C,N)-based cermets have an inverse behavior trend. The influence of Si 3 N 4 addition on thermal stability is clarified to better understand the relationship between thermal stability and mechanical properties of Ti(C,N)-based cermets. |
