摘要
为制造表面台阶清晰、高螺旋线精度的陶瓷变螺距混合器腔芯,以黏土粉体为固相,采用了水基注凝成型、高温无压烧结工艺,考察了pH值、分散剂浓度对浆料Zeta电位及粘度的影响,引发剂浓度对聚合反应温度-时间的影响,及烧结温度对烧结体的微观结构及物理性能的影响,得出最佳工艺参数。研究结果表明:pH=12、分散剂浓度为3 vol.%时,可制备出粘度低于1 Pa·s的黏土悬浮体系浆料;引发剂浓度为4 vol.%时,聚合度最高,固化时间可控制在3 min左右,其链增长反应的活化能为17.9 kJ/mol;在1200℃烧结,可得抗压强度为(19.6±0.926)MPa、密度为4.20 g/cm^(3)的烧结体。通过以上工艺参数可制出圆柱度为0.7506 mm的一体式陶瓷变螺距混合器腔芯。
In order to fabricate the ceramic spiral mixer core with accurate variable screw according to a spiral equation and apparent small steps on surface,clay powder was used as solid phase,and gelcasting and pressureless sintering were employed simultaneously in this study.Effects of pH and concentrations of dispersant on the Zeta potential and viscosity,concentrations of initiator on the temperature-time of this polymerization reaction,and sintering temperatures on microstructure and physical properties were investigated to optimize these parameters.The results show that a clay suspension slurry less than 1 Pa·s can be acquired when the pH and the dispersant are 12,3 vol.%,respectively.High polymerization degree can also be obtained when the initiator is 4 vol.%,and curing time is about 3 minutes.Besides,activation energy of the chain growth reaction is 17.9 kJ/mol.After sintering at 1200℃,a sintered body with the compressive strength of(19.6±0.926)MPa and density of 4.20 g/cm^(3) is prepared.Consequently,a ceramic spiral mixer core as a whole with cylindricity of 0.7506 mm meeting the application requirement can be manufactured successfully by the optimized parameters.
作者
李政洁
高哲
崔政伟
LI Zhengjie;GAO Zhe;CUI Zhengwei(Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology,School of Mechanical Engineering,Jiangnan University,Wuxi 214122,China)
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2021年第4期627-633,共7页
Journal of Materials Science and Engineering
基金
国家自然科学基金资助项目(21606109)
江苏省研究生科研与实践创新计划资助项目(SJCX19_0786)。
关键词
注凝成型
黏土粉体
陶瓷
变螺距混合器
链增长活化能
Gelcasting
Clay powder
Ceramic
Spiral mixer with variable screw pitch
Activation energy for chain growth
