摘要
将 Si_3N_4原料预热处理以及预合成 Si_3N_4-Al_2O_3-Y_2O_3系的晶界相,两者按适当比例制得的坯体,经无压烧结得到相对密度>97%的 Si_3N_4烧结体。其高温抗弯强度达400MPa(1300℃下),比通常工艺(未经处理的)制得的强度相应提高约25%。用 SEM、TEM 对这种 Si_3N_4试样的显微结构进行了研究分析,解释了强度提高的原因。
The bending strength of Si_3N_4 compacts prepared by pre-heating Si_3N_4 powdersand pre-synthetic grain-boundary phase of Si_3N_4-Al_2O_3-Y_2O_3 system and then sin-tered to a relative density>97% is 400 MPa(at 1300℃),which is 25% increasedas compared with,that obtained by usual technique(no heat treatment).The microstructures of the specimens were studied by SEM and TEM.Thereason of improving the mechanical properties was discussed in this paper.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
1990年第2期132-138,共7页
Journal of Inorganic Materials
关键词
氮化硅陶瓷
晶界相预合成
高温性能
Pre-synthetic grain boundary phase
Si_3N_4 ceramics
High temperature mechanical strength
Si_3N_4-Al_2O_3-Y_2O_3 system
