Abstract

The effects of boron or manganese added as B_4C, Mn, TiB_2, B on TiC-30vo1.%Ni_3Al cermet sintered at 1380 and 1400°C for 1 hour, were examined in relation with shrinkage, relative density, microstructure, lattice parameter, hardness and fracture toughness (K_IC). The results are summarized as follows: 1) The highest shrink-age showed about 30.5% in the specimen added B_4C and the maximum relative density was about 99% in the specimen added TiB_2; 2) The grains of TiC were grown during sintering and made the surrounding structure by adding boron and manganese. The largest grain size showed about 2.8mutextrmm in the specimen with boron sintered at 1400°C;3) The lattice parameter of TiC was about 4.325AA and Ni_3Al about 3.592AA by adding other elements; 4) The highest hardness was about 1100kgf/textrmmm2 in the specimen with B4C; 5) The fracture toughness (K_IC) showed about 15MNm-3/2 in the specimen added TiB_2.

• Keywords: Cermet;Ni_3Al;TiB_2;Microstructure;Hardness;