摘要
为了解决复杂形状陶瓷构件成型难的问题,利用光固化快速成型技术,以酚醛树脂为原料,制作了陶瓷复合材料构件。用XRD分析了炭支架和陶瓷构件的物相组成;应用TGA和SEM研究了生成炭支架的热解特性、孔道系统和陶瓷构件的微观组织结构;建立了渗硅的反应机理模型。结果表明:炭支架主要为酚醛树脂热解后生成的无定形碳,其残碳率为65%;渗硅温度为1500℃时生成的陶瓷构件是由Si、SiC和C组成的致密复相陶瓷;渗硅后如果温度升高至1650℃进行排Si,则生成多孔复相陶瓷;光固化树脂网格结构和淀粉结合生成的孔道系统,能够有效避免制件的破裂并有利于渗硅反应;在1500℃温度渗硅30 min得到的SiC层厚为20μm。
Using phenolic resin as the raw material, complex-shaped components, which were composed of SiC, C and Si, were formed by stereolithography technology. X-ray diffraction was employed to analyze the phase of carbon templates and ceramic components. The pyrolysis behaviors and the forming mechanism of the porous system were studied with thermo-gravimetric analysis. The microstructures of the ceramic components were observed with scanning electron microscope. A model of the mechanism of reactive infiltration of Si into the carbon template was built. The carbon templates obtained by the pyrolysis of phenolic resin precursor possess amorphous state structures, and the residual carbon is 65 wt%. The ceramic components obtained at 1500℃ by reactive infiltration of Si are dense ceramics containing SiC, C and Si. At 1650℃ the ceramics are porous ceramics. The porous system formed by photocurable resin structures and starch powders could effectively prevent the carbon templates from breaking and cracking and facilitate penetrating Si to the carbon templates to form SiC. The thickness of SiC obtained at 1500 ℃ for 30 min is 20 μm.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2006年第6期138-143,共6页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(50475082)
陕西省科技攻关计划项目(2005K05-G3)
关键词
陶瓷
碳化硅
模具
快速成型
热解
ceramic
SiC
mould
rapid prototype
pyrolysis
