SiO_(2)含量对光固化3D打印SiC浆料及素坯性能的影响

Effect of SiO_(2)content on properties of SiC ceramic slurry and green body for stereolithography 3D printing

光固化3D打印技术的出现为制备复杂结构SiC陶瓷零部件提供了新的技术方案,但SiC高吸光、高折射率的特性导致其出现打印难固化的共性问题。通过在SiC陶瓷基体粉末中加入低吸光度、低折射率的SiO_(2)作为填料以改善SiC陶瓷浆料的固化性能和打印精度。研究了不同SiO_(2)添加量对浆料流变性、稳定性和固化性的影响及其作用机理,利用光固化3D打印技术制备出了高精度、表面质量好的素坯,对素坯的微观结构和性能进行了测试分析。结果表明:在SiC浆料中添加SiO_(2)能降低浆料的黏度、改善浆料的稳定性、提高浆料的固化性能;SiO_(2)的添加显著改善了SiC素坯的表面粗糙度,使素坯的抗弯强度先增大后减小。

The stereolithography 3D printing technology provides a new technical solution for the preparation of complex structure SiC ceramic parts,but the characteristics of high light absorption and high refractive index of SiC lead to a common problem that printing is difficult to cure.SiO_(2)with low absorbance and low refractive index was added to SiC ceramic matrix powder as filler to improve the curing property and printing accuracy of SiC ceramic paste.The effects of different amounts of SiO_(2)on the rheology,stability and curing properties of the slurry and its mechanism were studied.The green body with high precision and good surface quality was prepared by stereolithography 3D printing technology,and the microstructure and properties of the green body were tested and analyzed.The results show that the adding SiO_(2)to the SiC slurry can reduce the viscosity,improve the stability,and improve the curing property of the slurry.The addition of SiO_(2)can significantly improve the surface roughness of the SiC green body and make the bending strength increase at first and decrease then.