TiC-Ni3Al Cermet에 타성분(B4C, Mn, TiB2, B) 첨가의 영향

Abstract

The effects of boron or manganese added as B4C, Mn, TiB2, B on TiC-30vol.%Ni3Al cermet sintered at 1380 and 1400℃ for 1 hour, were examined in relation with shrinkage, relative density, microstructure, lattice parameter, hardness and fracture toughness (KIC). The results are summarized as follows: 1) The highest shrinkage showed about 30.5% in the specimen added B4C and the maximum relative density was about 99% in the specimen added TiB2; 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 2.8 μm in the specimen with boron sintered at 1400℃; 3) The lattice parameter of TiC was about 4.325Å and Ni3Al about 3.592Å by adding other elements; 4) The highest hardness was about 1100 kgf/mm2 in the specimen with B4C; 5) The fracture toughness (KIC) showed about 15 MNm-3/2 in the specimen added TiB2.