复合烧结助剂对Si3N4陶瓷力学性能和热导率的影响

付师, 杨增朝, 李宏华, 王良, 李江涛

Mechanical Properties and Thermal Conductivity of Si3N4 Ceramics with Composite Sintering Additives

FU Shi, YANG Zengchao, LI Honghua, WANG Liang, LI Jiangtao

表1 热压烧结制备Si3N4陶瓷样品的性能

Table 1 Properties of Si3N4 ceramic samples prepared by hot pressing sintering

Sample Ionic radius/nm Relative density/% Grain size/μm Vickers’ hardness/GPa Flexural strength/MPa Fracture toughness/ (MPa·m1/2) Thermal conductivity/ (W·m-1·K-1) ScM 0.073 99.36 0.72±0.32 14.58±0.25 905±36 8.21±0.09 54.7 LuM 0.085 99.53 0.9±0.40 14.75±0.20 785±25 8.01±0.12 49.6 YbM 0.086 99.49 0.97±0.47 14.75±0.27 759±20 8.03±0.16 49.7 YM 0.089 99.73 1.03±0.46 14.64±0.29 819±10 8.65±0.11 51.1 GdM 0.094 99.89 1.01±0.48 14.57±0.22 792±34 7.62±0.47 54.6 NdM 0.100 99.37 0.95±0.42 14.79±0.27 1115±49 7.19±0.10 53.9 LaM 0.106 99.21 0.9±0.41 15.37±0.33 978±39 7.25±0.10 52.8