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利用放电等离子烧结工艺制备了BNw/Si_3N_4复合透波材料,并借助扫描电子显微镜、X射线衍射仪和矢量网络分析仪等仪器分别对BNw/Si_3N_4复合透波材料的微观形貌、物相组成和介电常数等性能进行分析。研究结果表明:当氮化硼晶须含量为7.5 wt%时,放电等离子烧结温度为1500℃、烧结压力为40 MPa时可制备出弯曲强度、断裂韧性、介电常数和介电损耗分别为404 MPa、4.23 MPa·m~(1/2)、4.07和4×10~(-3)综合性能优良的BNw/Si_3N_4复合透波材料。
BNW / Si_3N_4 composite transparent materials were prepared by spark plasma sintering. The microstructure, phase composition and phase composition of BNw / Si_3N_4 composite transparent materials were characterized by scanning electron microscopy, X-ray diffraction and vector network analyzer, respectively Dielectric constant and other properties for analysis. The results show that the flexural strength, fracture toughness, dielectric constant and dielectric loss of the boron nitride whiskers are respectively 404% and 1500 ℃ when the content of boron nitride whiskers is 7.5 wt% MPa, 4.23 MPa · m ~ (1/2), 4.07 and 4 × 10 ~ (-3).