Method for preparing high-strength high temperature resistance SiC ceramic turbine impeller through SLS/CVI

• Main Authors: CHENG SU, ZENG TAO, LIU GUANTING, MAN JIYOU, ZHANG KUN
• Format: Patent
• Language: Chinese; English
• Published: 17.10.2017
• Subjects: ADDITIVE MANUFACTURING TECHNOLOGY; ADDITIVE MANUFACTURING, i.e. MANUFACTURING OFTHREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVEAGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING,STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING; ARTIFICIAL STONE; BLASTING; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; ENGINE PLANTS IN GENERAL; HEATING; LIGHTING; LIME, MAGNESIA; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; METALLURGY; NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES; PERFORMING OPERATIONS; REFRACTORIES; SLAG; STEAM ENGINES; TRANSPORTING; TREATMENT OF NATURAL STONE; WEAPONS

The invention discloses a method for preparing a high-strength high temperature resistance SiC ceramic turbine impeller through SLS/CVI, and relates to a method for preparing a SiC ceramic turbine impeller. The method aims at solving the technical problem of low ceramic strength and density of SiC ceramic prepared through the conventional 3D printing technology. The method comprises the following steps: firstly, establishing a three-dimensional model of the turbine impeller; secondly, performing layering processing on the three-dimensional model; thirdly, preparing a ceramic powder; fourthly, printing layer by layer, and preparing a ceramic green body; fifthly, removing a redundant powder; sixthly, performing thermocuring; seventhly, performing degreasing; eighthly, performing chemical vapor infiltration densifying. The method designs a technology of the combination of SLS and CVI methods, is simple in technology, low in material and equipment costs, short in manufacture period, ensures that excess materials