| Title |
The Properties of β-SiC-ZrB_2 Electroconductive Ceramic Composites with Al_2O_3+Y_2O_3Contents |
| Authors |
신용덕(Shin, Yong-Deok) ; 주진영(Ju, Jin-Young) ; 황철(Hwang, Chul) |
| Keywords |
Electroconductive ceramic composites ; Al_2O_3+Y_2O_3 ; Electrical Resistivity ; Fracture Toughness Resistance Temperature Coefficient |
| Abstract |
The mechanical and electrical properties of the hot-pressed and annealed β-SiC-ZrB_2 electroconductive ceramic composites were investigated as a function of the liquid forming additives ofAl_2O_3+Y_2O_3 Phase analysis of composites by XRD revealed α-SiC(6H) ZrB_2 and YAG(Al_5Y_3O_{12}) The relative density of composites were increased with increased Al2O3+Y2O3 contents. The Flexural strength showed the highest value of 390.6MPa for composites added with 20wt% Al2O3+Y2O3 additives at room temperature. Owing to crack deflection crack bridging phase transition and YAG of fracture toughness mechanism the fracture toughness showed the highest value of 6.3MPa.m1/2 for composites added with 24wt% Al2O3+Y2O3 additives at room temperature. The resistance temperature coefficient showed the value of 2.46×10^{-3} , 2.47×10^{-3}, 2.52×10^{-3}/°C for composite added with 16, 20, 24wt% Al2O3+Y2O3 additives respectively. The electrical resistivity of the composites was all positive temperature coefficient resistance(PTCR) in the temperature range of 256°C to 900°C |