Gas pressure sintering of BN/Si3N4 wave-transparent material with Y2O3-MgO nanopowders addition
Gas pressure sintering of BN/Si3N4 wave-transparent material with Y2O3-MgO nanopowders addition
复制标题
Y2O3-MgO纳米粉体气压烧结BN/Si3N4透波材料
DOI：
10.1016/j.ceramint.2014.05.054
复制
发表时间：
2014
影响因子：
5.2
通讯作者：
Li Qisong
中科院分区：
文献类型：
--
作者：
Zhao Yujun;Zhang Yujun;Gong Hongyu;Sun Haibin;Li Qisong
以氮化硼、氮化硅和Y2 O3-MgO纳米粉体为原料，在1700 °C、6 MPa、N2气氛下气压烧结，制备了BN/Si 3 N4航天透波陶瓷。研究了Y2 O3-MgO纳米粉体对BN/Si 3 N4材料的致密化、相演变、显微结构和力学性能的影响。Y2 O3-MgO纳米粉体的加入有利于提高BN/Si 3 N4复合材料的力学性能。添加8wt%Y2O3-MgO纳米粉体的BN/Si 3 N4陶瓷的相对密度为80.2%，断裂韧性为4.6 MPa m1/2，弯曲强度为396.5 MPa。
BN/Si3N4ceramics performed as wave-transparent material in spacecraft were fabricated with boron nitride powders, silicon nitride powders and Y2O3–MgO nanopowders by gas pressure sintering at 1700 °C under 6 MPa in N2atmosphere. The effects of Y2O3–MgO nanopowders on densification, phase evolution, microstructure and mechanical properties of BN/Si3N4material were investigated. The addition of Y2O3–MgO nanopowders was found beneficial to the mechanical properties of BN/Si3N4composites. The BN/Si3N4ceramics with 8 wt% Y2O3–MgO nanopowders showed a relative density of 80.2%, combining a fracture toughness of 4.6 MPa m1/2with an acceptable flexural strength of 396.5 MPa.