Ti(C,N)-Cr_3C_2-A1_2O_3混合粉末のホットプレス

概要

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Cutting tools of Ti (C, N) - Cr_3C_2 ceramics have better wear resistance than those of TiC-TiN cermets and WC-Co alloy tools for carbon steel. Sintered bodies of this system have the fracture toughness K_<lC> of 2.5 MPa・m^<1/2>. Higher fracture toughness is necessary for wider application. Therefore, addition of Al_2O_3 to Ti(C, N) = Cr_3C_2 system is tried. The main results are as follows : (1) Ti(C, N)-5 wt% Cr_3C_2-Al_2O_3 sintered bodies containing 30-50 wt% Al_2O_3 have the porosity of 0.1 vol% , K_<lC> of 4.2 MPa・m^<l/2>, transverse rupture strength of about 700 MPa, and Vickers hardness of 1850 Hv. (2) These sintered bodies consist of (Ti, Cr) (C, N, O) and Al_2O_3 (3) It is thought that high K_<lC> is due to high toughness of Al_2O_3 grains and grain boundaries between (Ti, Cr) (C, N, O) and Al_2O_3.
社団法人日本セラミックス協会の論文
1990-07-01