核用氧化锆耐火材料光固化增材制造工艺及性能研究  

Digital Light Processing Additive Manufacturing Process and Properties of Zirconia Refractory for Nuclear Application

作　　者：张勤 赵朗朗 刘征 杨廷贵 ZHANG Qin;ZHAO Lang-lang;LIU Zheng;YANG Ting-gui(Institute of Science and Technology,China National Nuclear Corporation 404,Lanzhou 732850,China;Chengdu Nuclear Engineering Design&Research Institute Co.,Ltd.,404,CNNC,Chengdu 610000,China;Institute of Aviation Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]中核四0四有限公司科学技术研究院,兰州732850 [2]中核四0四成都核技术工程设计研究院有限公司,成都610000 [3]南昌航空大学航空制造工程学院,南昌330063

出　　处：《精密成形工程》2023年第4期217-227,共11页Journal of Netshape Forming Engineering

基　　金：中核集团青年英才科研项目(75);国家自然科学基金青年科学基金(52105356)。

摘　　要：目的为提高精密铸造效率,缩短制模周期,利用光固化增材制造技术制备适合活泼金属铸造用的ZrO_(2)陶瓷模具。方法将光敏树脂与纳米级ZrO_(2)陶瓷粉体混合得到具有光固化性能的陶瓷浆料,采用数字光投影增材制造设备对陶瓷浆料进行逐层曝光,揭示不同固含量对陶瓷浆料固化性能的影响规律;利用光固化3D打印制备ZrO_(2)陶瓷生坯,经过干燥、脱脂和烧结处理,获得所需陶瓷样件,并对成型后的ZrO_(2)陶瓷进行微观组织表征、力学性能(压缩和弯曲)和抗热震性能测试。结果在相同固化强度的基础上,随着ZrO_(2)陶瓷浆料固含量的增加,固化深度逐渐减小,固化宽度无明显变化。光强度越高,固化深度和宽度均越大。选用固含量(体积分数)为50%的陶瓷浆料,在紫外光波长405 nm、光强度25 mW/cm^(2)、曝光时间2000 ms、层厚30μm的工艺条件下制备ZrO_(2)陶瓷生坯,经过最高温度450℃脱脂和最高温度1525℃烧结处理,获得了无变形和开裂的ZrO_(2)陶瓷样件。陶瓷的压缩和弯曲强度分别达到2943、833 MPa,与等静压工艺制备的陶瓷强度相当,优于其他3D打印工艺制备的陶瓷产品。光固化3D打印ZrO_(2)陶瓷在800℃下热震10次和1400℃下热震5次后才开始出现局部细小裂纹,满足核冶金铸造使用要求。结论利用光固化3D打印技术可制备致密度大、强度高、抗热震性能良好的陶瓷模具,是一种工艺简单、效率高的新型陶瓷加工工艺,在核工业领域具有重要的应用前景。The work aims to prepare ZrO_(2)ceramic molds suitable for active metal casting through the digital light processing additive manufacturing technology to improve the efficiency of precision casting and shorten the mold cycle.The ceramic slurry with photocuring properties was obtained by mixing photosensitive resin with nano-sized ZrO_(2)ceramic powder.The ceramic slurry was exposed layer by layer by digital light projection and digital light processing additive manufacturing equipment to reveal the effects of different solid contents on the curing properties of ceramic slurry.The ZrO_(2)ceramic green body was prepared through digital light processing 3D printing.After drying,debinding and sintering,the required ceramic samples were obtained.After forming,the microstructure characterization,mechanical properties(compression and bending)and thermal shock resistance of ZrO_(2)ceramic were tested.On the basis of the same curing strength,the curing depth decreased and the curing width had no obvious change with the increase of the solid content of ZrO_(2)ceramic slurry.The curing depth and width became larger with the higher light intensity.ZrO_(2)ceramic green bodies were prepared through ceramic slurry with solid content of 50 vol.%under the conditions of UV wavelength of 405 nm,light intensity of 25 mW/cm^(2),exposure time of 2000 ms and layer thickness of 30μm.After debinding at the highest temperature of 450℃and sintering at the highest temperature of 1525℃,ZrO_(2)ceramic samples without deformation and cracking were obtained.The compressive and bending strengths of the ceramics reached 2943 MPa and 833 MPa,respectively,which were comparable to those of the ceramics prepared by isostatic pressing process,and superior to those of the ceramics prepared by other 3D printing processes.The ZrO_(2)ceramic made through digital light processing 3D printing began to have local small cracks after thermal shock of 10 times at 800℃and 5 times at 1400℃,which met the requirements of nuclear metallurgy casting.Ceramic

关 键 词：ZRO2陶瓷 光固化3D打印 压缩强度 弯曲强度 抗热震性能 

分 类 号：TF124[冶金工程—粉末冶金]