대상 데이터

• and 304 stainless steel were joined by the active metal vacuum-brazing method in 800・850*C. A copper sheet was used as the interlayer and Ti-Ag-Cu alloy (Cusil-ABA, WESGO Metals, San Carlos, USA) was used as the brazing filler metal. Si3N₄ specimens were cut into 3×4×20 mm bars.
• Results showed that controlled porosity is obtainable by varying the carbon content and green density. The samples exhibit the microstructure that is conposed of fibrous Si3N₄ grains and nanosized SiC particles, fine pore size, and a good permeability due to the high porosity. The bending strengths linearly increased with increasing strain rate at room teneerature and distributed from 350 to 400 MPa.
• and carbon powders. The used powders were high purity Si3N₄ powder (SN-E10, UBE Industries Ltd, Tokyo, Japan; a ratio: >95%, mean particle size: 0.5 μm, main impurities by weight: 0=1.6%; C<0.2%; Cl, Fe, Ca and Al2O₃<50 ppm), carbon powder (No. 2600, Mitsubishi Chemical Corp., Tokyo, Japan; mean particle size: 13 nm) and sintering aid Y2O₃ powder (99.9% purity, Kojundo Chemical Lab. Co, Ltd, Sakado, Japan). For fabrication of the SigNJSiC nanoconq)osites with 20 vol.