基于熔融沉积技术的多孔氮化硅陶瓷制备与烧结研究

Preparation and Sintering of Porous Silicon Nitride Ceramics Based on Melt Deposition Technology

通过增材制造制备复杂结构的多孔氮化硅陶瓷备受关注。然而,由于陶瓷脆而硬的特性不能直接用于挤压成型。因此,开发一种兼备高温流动稳定性、高均匀性双重功能的多孔氮化硅陶瓷喂料的方法,成功解决陶瓷不能直接应用于熔融沉积成型的困难。即加入石蜡、塑料等有机成分来使陶瓷粉末易于加热为熔融状态,并具有较好的流动性。此外,通过引入表面活性剂、有机粘结剂对陶瓷粉料进行表面改性,提升融合水平。该方法成功地解决了陶瓷不能直接应用于熔融沉积成型的困难,也适用于大范围陶瓷体系基于熔融沉积技术制备,最后对制备的夹层结构陶瓷力热电性能进行测试。

The preparation of porous silicon nitride ceramics with complex structures by additive manufacturing have attracted much attention.However,due to the brittle and hard characteristics of the ceramic which can not be used directly for extrusion molding.Therefore,a method for feeding porous silicon nitride ceramics with dual functions are developed,including flow stability and high uniformity at high temperature,This methods are successfully solved the difficulty that ceramics cannot be directly applied to fused deposition modeling.The specific methods as follows:adding organic components such as paraffin and plastic to make the ceramic powder easy to heat into molten state with good fluidity.In addition,In order to improve the level of fusion,the ceramic powder is modified by adding surfactants and organic binders.The method successfully solves the difficulty that ceramics cannot be directly applied to fused deposition modeling.Furthermore the way is suitable for the preparation of a wide range of ceramic systems based on fused deposition technology.Finally,the mechanics,thermal and electrical properties of the sandwich structure ceramics are tested.