摘要
将光固化成型和凝胶注模技术相结合成形涡轮叶片陶瓷型芯,克服了熔模铸造中陶瓷型芯制备周期长、成本高、响应慢等不足,对新型复杂结构单晶叶片的快速研制具有重要意义。研究氧化硅基陶瓷型芯的高温强度和收缩率演变规律,探究了纳米氧化锆和铝粉的添加量以及烧结时间对其影响。通过场发射扫描电镜对样件的微观形貌进行表征,采用三点抗弯法测试了样件的高温强度。结果表明:当纳米氧化锆质量分数为2.16%、铝粉质量分数为9.8%、烧结时间为3.9 h时,氧化硅基陶瓷型芯的高温强度达到14.3 MPa,满足单晶叶片定向凝固铸造需求。制备的陶瓷型芯表面无明显裂纹,结构完整,成型质量较好。
The shortcomings of long period,high cost and slow response in making ceramic core by using investment casting method were overcome by using stereolithography and gel casting,which is of great significance for the rapid manufacturing of the single crystal blades with complex structure.The evolution rule of high temperature strength and shrinkage of silica based ceramic core was studied.The addition amount of nano zirconia power and aluminum powder and sintering time were explored.The micro morphology of the sample was characterized by field emission scanning electron microscope,and the high temperature strength of the sample was measured by three-point bending method.The results show that:when the mass fraction of nano zirconia power is 2.16%,the mass fraction of aluminum powder is 9.8%and the sintering time is 3.9 h,the maximum high temperature strength value of silicon oxide-based ceramic core reaches 14.3 MPa.The value of high temperature strength meets the needs of directional solidification casting of single crystal blade.There are no obvious cracks on the surface of the prepared ceramic core,the structure is complete and the molding quality is good.
作者
王权威
王程冬
鲁中良
苗恺
艾子超
李涤尘
WANG Quanwei;WANG Chengdong;LU Zhongliang;MIAO Kai;AI Zichao;LI Dichen(State Key Laboratory of Mechanical Manufacturing System Engineering,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2022年第7期51-58,共8页
Journal of Materials Engineering
基金
国家科技重大专项(J2019-Ⅶ-0013-0153)。
关键词
空心涡轮叶片
陶瓷型芯
高温强度
响应面分析法
hollow turbine blade
ceramic core
high temperature strength
response surface metho-dology
