中文摘要：

利用放电等离子烧结工艺制备了BNw／Si3N4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／Si3N4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1 500℃、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·m1／2、4．07和4×1 0^-3综合性能优良的BNw／Si3N4复合透波材料。

英文摘要：

BNw/Si3N4 wave-transparent composites were prepared by spark plasma sintering. Scanning electronmicroscope, X-ray diffractometer and vector network analyzer were used to characterize the micro, phase compositionand dielectric property of the BNw/Si3N4 wave-transparent composites, respectively. The results show that BNw/Si3N4wave-transparent composites with better comprehensive properties that flexural strength of 404 MPa, fracture toughnessof 4.23 MPa · m^ 1/2, dielectric constant of 4.07 and dielectric loss tangent of 4x10-s can be prepared when sintered at1500 ℃ under 40 MPa with BNw content of 7.5 wt%