基于SLS的高强度低密石墨陶瓷复合隔热材料快速制备

本文率先利用选择性激光烧结技术快速制备了高强度石墨陶瓷复合隔热材料,重点研究了二次固化、真空压力浸渍、碳化和高温烧结等后处理工艺以及材料配方组成对其密度、抗压强度和导热系数的影响。研究发现加入适量的硅粉和可膨胀石墨可以对石墨陶瓷复合隔热材料的密度、抗压强度和导热系数进行调控,采取合适后处理工艺路线可以改变石墨陶瓷复合隔热材料的综合性能。最终实现了低密度(<1.2 g/cm^3)、高抗压强度(>10 MPa)、低的导热系数(<2 W/(m·K))和耐高温(>1650℃)等多个性能指标的统一,满足了工业应用需求。

Rapid preparation of high strength and low density graphite ceramic composite thermal insulation material based on SLS

In this paper,high strength graphite ceramic composite thermal insulation materials were prepared by selective laser sintering.The effects of post-treatment processes such as secondary curing,vacuum pressure impregnation,carbonation and high temperature sintering and the composition of materials on their density,compressive strength and thermal conductivity were studied.It is found that the density,compressive strength and thermal conductivity of graphite ceramic composite thermal insulation materials could be controlled by adding appropriate amount of silicon powder and expandable graphite.The comprehensive properties of graphite ceramic composite thermal insulation materials could be changed by adopting appropriate post-treatment process.Finally,it realized the unification of many performance indexes,such as low density(<1.2 g/cm^3),high compressive strength(>10 MPa),low thermal conductivity(<2 W/(m·K))and high temperature resistance(>1650℃),which met the needs of industrial applications.