Research On Selective Laser Sintering Of Composite Ceramic

Selective laser sintering (SLS) is one of the most attentive rapid prototyping techniques due to its suitability to process almost any power materials.In this paper, a series of researches on process parameters of selective laser sintering of composite ceramic were carried out. The main works and gain are as following:(1) Analyzing the sintering theory of nano material and the heat conduction theory of laser machining, the mathematic model of grain size growth of nano material in laser irradiation was built. The growth trends of grain size were simulated under different laser technological parameters.(2) Analyzing the selective laser sintering of metal powder materials, especially the theory of ball effect. Introduce the heat-conducting medium into process of composite ceramic manufacture.(3) Single layer selective laser sintering of composite material (Ni/WC) was carried out. Process parameters which affect the sintering quality of selective laser sintering of composite ceramic were analyzed.(4) Used KGH95 Nickel-based metal powder materials as heat-conducting medium and experiments were carried out with SLS for composite ceramic powder materials (Ni/WC). Some 3D-shape composite ceramic parts with compact and even structure were sintered successfully.(5) Mix the SiC nano particles into the powder materials used in step (4) according to the different wt%. With the mixed nano-micro composite ceramic powder, 3D-shape composite ceramic parts were sintered successfully. Some SiC nano particles were dispersed into Nickel-based metal by powerful laser. WC micro particles were separated into smaller particles existent in Nickel-based metal. Nano-micro composite ceramic material can be sintered with SLS.