Ti(C,N)-Cr_3C_2混合粉の真空焼結

概要

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Ti(C,N), TiN, and TiN have high melting points, high hardness and extremely good wear resistance to steel. Among them, the densification of Ti(C,N) is easiest. However, the sintered body of pure Ti(C, N) has a porosity of several volume persent. The properties of Ti(C, N) - Cr_3C_2 ceramics were studied. Also, the densification behavior of the Ti (C, N) - Cr3C_2 system was compared with those of the TiC- Cr_3C_2, TiN- Cr3C2 and TiC- TiN- Cr_3C_2 systems. The main results are as follows : (1) The Ti(C, N) - Cr_3C_2 system can be sintered at relatively low temperatures from 1873 to 1973 K. The Cr_3C, additive plays an effective role in the densification of Ti(C, N) . (2) Ti(C,N) -5% Cr_3C_2 ceramics had a porosity of 0.1 vol%, a transverse rupture strength of 450 MPa and a Vickers hardness of 1900. (3) In the TiC-20% Cr_3C_2 and TiN-20% Cr_3C_2 system, the chromium carbide phase dissolves completely into TiC and TiN, and does not remain among the grains. Thus, TiC and TiN grains grow. (4) Both Ti(C,N) -20% Cr_3C_2 and TiC-TiN-20% Cr_3C_2 ceramics had a Cr_7C_3 phase among the grains. Cr_7C_3 re-strains the Ti(C. N) grain growth more effectively than TiC- TiN grain growth.
社団法人日本セラミックス協会の論文
1989-02-01