Research On Processing Technology Of Porous Silicon Carbide Ceramic Parts Based On 3D Printing Composite Molding

Silicon ceramic has the characteristics of excellent bending strength,oxidation resistance,corrosion resistance,etc.,and has excellent performance among known ceramic materials.Related products of SiC ceramics have many applications in industrial,high-tech and medical fields.The traditional SiC ceramic processing technology has low production efficiency and is difficult to meet the processing requirements of non-standard parts.However,3D printing technology can meet the processing of complex parts through its own unique processing methods,and maintain high production efficiency and molding.Accuracy.This paper mainly researches the processing technology of porous SiC ceramics based on 3D printing composite molding,prepares SiC ceramic slurry suitable for surface molding3D printing technology,and studies the printing of parts and the sintering process.At the same time,in view of the high sintering temperature and harsh sintering conditions of SiC ceramic materials,this paper studies the addition of Al₂O₃ as a sintering aid to assist sintering molding,and analyzes in detail the viscosity and solid phase of the SiC ceramic slurry by adding sintering aids.The content and the influence of sintering temperature.This article briefly introduces two different processing techniques of surface forming 3D printing technology,and analyzes the differences and advantages and disadvantages of the two processing techniques.At the same time,a relatively in-depth study was carried out on the preparation of the slurry required for printing,and the selection of photosensitive resin and SiC powder,as well as the preparation process route of the slurry,the setting of the process parameters in the ball milling stage,the SiC powder of different particle sizes,and the The effect of solid content,modification treatment,temperature,etc.on the viscosity of the slurry,and the effect of the addition of Al₂O₃ on the viscosity and solid content of the slurry.In the research of printing and sintering process,the photocuring performance of the slurry was studied,the critical light intensity and curing depth of the slurry of different particle sizes were studied,and the temperature range of the debinding and sintering stage was divided,and the different temperatures were clarified.The causes of interval debinding and sintering defects have been studied on the component changes,dimensional changes,and appearance changes of parts during debinding and sintering,and the resulting problems have been optimized to achieve defect-free debinding of parts.In the high-temperature sintering stage,the problem of parts collapse in the high-temperature sintering stage is effectively solved by adding sintering aids.The temperature required for densification of parts with sintering aids and parts without sintering aids added during high-temperature sintering,the mechanism of sintering aids and the positive effects of sintering aids on reducing the sintering temperature of SiC ceramics are clarified.