摘要
对以热塑性树脂和石蜡为要结合剂，ＳｉＣ晶须含量为０～２０％（ｖｏｌ）的ＳｉＣ＿ｗ／Ｓｉ＿３Ｎ＿４复相陶瓷混合物料注射熔体的流变特性进行了研究。实验发现：该体系的流变模型为非牛顿假塑性体，具有剪切变稀特征；其本构方程满足幂律函数：τ＝ｋγ￣ｎ；并在较高剪切速率下（在实际陶瓷注射成型范围内１００～１０００ｓ￣（－１）），ＳｉＣ晶须的引入对注射熔体表观粘度影响较小。本文同时对体积比为１５：８５的ＳｉＣｗ／Ｓｉ＿３Ｎ＿４体系的注射动态过程进行广测试分析，得出了模腔内压力分布规律：Ｐ＿ｘ＝及模腔温度变化特性，＃讨论了它们对陶瓷注射成型的影响。
The rheological properties of SiC_w/Si_3N_4 ceramic composite and its injection moulding werestudied. The mixture consists of Si_3N_4 with 0～20%(vol)silicon carbide whiskers and polymer and wax asthe key organic binder vehicles.The experimental results show that rheological model of the injection mould-ing mixture belongs to non -Newtonian pseudoplastic with the characteristic of shear thinning and the rheo-logical equation of the mixture fits the power law:The apparent viscosity of the mixture increasesonly slightly after adding,silicon carbide whiskers under a high shear rate(in the range of practical injectionmoulding).The injection dynamic process of SiC_w/Si_3N_4 mixture added with 15%(vol)silicon carbidewhiskers was also investigated. It turns out that the cavity pressure distribution can be expressed by the e-quation The influences of rheological properties and injection parameters on ceramic compositeinjection moulding were also discussed.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1995年第2期128-133,共6页
Journal of The Chinese Ceramic Society
关键词
碳化硅
晶须
氮化硅
复合材料
流变
陶瓷
silicon carbide whisker,silicon nitride,composite,injection moulding,rheological properties,ynamic process
