| Title |
Properties of SiC-Ti B_2 Electroconductive Ceramic Composites by Pressureless Annealing |
| Authors |
신용덕 ; 주진영 ; 최광수 ; 오상수 ; 윤양웅 |
| Keywords |
Electroconductive ; Pressureless Annealed ; Liquid Additive YAG ; Fracture Toughness ; PTCR |
| Abstract |
The mechanical and electrical properties of the hot-pressed and pressureless annealed SiC-Ti B_2electroconductive ceramic composites were investigated as functions of the liquid additives of Al_2 O_3+ Y_2 O_3. The result of phase analysis for the SiC-Ti B_2 composites by XRD revealed α-SiC(6H), Ti B_2, and YAG(A l_{5} Y_3 O_{12} ) crystal phase. The relative density of SiC-Ti B_2 composites was increased with increased Al_2 O_3+ Y_2 O_3 contents. The fracture toughness showed the highest value of 6.04 Mpa m^{ frac{1}{2}} for composites added with l2wt% A1_2 O_3+ Y_2 O_3 additives at room temperature. The electrical resistivity showed the lowest value of 6.2×10^{-3} Ω·cm for composite added with l6wt% Al_2 O_3+ Y_2 O_3 additives at room temperature. The electrical resistivity of the SiC-Ti B_2 composites was all positive temperature cofficient resistance(PTCR) in the temperature ranges from 25°C to 700°C. |