燃烧合成氮化硅粉体的性能一致性评价方法和应用

李宏华, 东婉茹, 王良, 杨增朝, 李江涛

Consistency of Silicon Nitride Powders Produced by Combustion Synthesis: Evaluation and Application

LI Honghua, DONG Wanru, WANG Liang, YANG Zengchao, LI Jiangtao

表3 三个类中心处粉体性能指标

Table 3 Performance index of powder at three class centers

General indicator Secondary indicator Symbol Unit Class ① Class ② Class ③ Physical/ chemical indicator Physical property Size D10 μm 1.870 1.854 2.275 D50 μm 6.439 6.158 7.798 D90 μm 16.819 16.038 19.092 Bulk density ρB kg/m3 0.229 0.211 0.261 Specific surface area S m2/g 2.599 2.480 1.892 Component property α phase content A % (in mass) 92.625 94.350 92.231 O content O % (in mass) 1.368 0.940 0.800 Moisture content H2O % (in mass) 1.086 1.206 1.654 Liquidity indicator Stability and variable flow rate Basic flowability energy BFE mJ 412.750 458.000 510.500 Stability index SI — 1.058 1.009 1.033 Flow rate index FRI — 1.840 1.659 1.731 Specific energy SE mJ/g 9.283 8.986 9.423 Compressibility Conditioned bulk density CBD g/mL 0.295 0.287 0.403 Compressibility CPSm % 32.463 37.462 33.388 Shear test Cohesion Cm kPa 1.609 1.949 1.711 Unconfined yield strength UYSm kPa 6.540 7.874 6.989 Maximum principal stress MPSm kPa 28.175 28.337 28.281 Flow function FFm — 4.341 3.619 4.055 Angle of internal friction AIF ° 37.612 37.325 37.800 Aeration Test Aerated energy AEn — 100.200 140.750 104.262 Aeration ratio AR — 4.053 3.975 6.719 Normalized aeration sensitivity NAS s/mm 0.119 0.089 0.119 Permeability Pressure drop PDm mbar 20.025 12.492 5.169