Thermal shock resistant 3D printed ceramics reinforced with MgAl_(2)O_(4) shell structure  

作　　者：Yuxiang Qiu Qiaolei Li Kun Yang Funan Jin Jun Fan Jingjing Liang Yizhou Zhou Xiaofeng Sun Jinguo Li 

机构地区：[1]Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China [3]School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China [4]Space Manufacturing Technology(CAS Key Lab),Beijing 100094,China

出　　处：《Journal of Materials Science & Technology》2024年第11期100-111,共12页材料科学技术（英文版）

基　　金：National Key Research and Development Program of China(No.2017YFA0700704);National Defense Basic Scientific Research Program of China(Grant No.JCKY2022130C005);National Natural Science Foundation of China(No.U22A20129);National Science and Technology Major Project(No.2017-VI-0002–0072);National Key Research and Development Program of China(No.2018YFB1106600);Students’Innovation and Entrepreneurship Foundation of USTC(Nos.CY2022G10 and CY2022C24)。

摘　　要：The demand for the swirl nozzle with enhanced temperature resistance and lightweight properties is in-creasing as the thrust-to-weight ratio of aero-engines rises.The Al_(2)O_(3) ceramic swirl nozzle can maintain high strength in a hostile environment of high temperature and severe corrosion,while also meeting the requirements of aircraft to enhance efficiency and decrease weight.However,Al_(2)O_(3) ceramics are limited in their application for aerospace components due to their poor thermal shock resistance(TSR)stemming from their inherent brittleness.This work reported an innovative design and fabrication strategy based on photopolymerization 3D printing technology to realize the three-dimensional shell structure through element interdiffusion and nanoscale stacking of the reinforced phase.With this strategy,a novel type of the new dual-structure Al_(2)O_(3) ceramic composed of MgAl_(2)O_(4) shell structure and matrix could be con-structed in situ.The nano-sized MgAl_(2)O_(4) caused a crack passivation effect after the thermal shock,which could improve the strength and TSR of 3D-printed Al_(2)O_(3) ceramic.In addition,the effects of MgO content and sintering temperature on sintering behavior,flexural strength,porosity,and TSR of Al_(2)O_(3) ceram-ics manufactured by digital light processing(DLP)processing were systematically studied.The optimum overall performance of Al_(2)O_(3) ceramics was obtained at the sintering temperature of 1550℃and the MgO content of 1.0 wt.%,with a maximum flexural strength of 111.929 MPa and a critical temperature difference of 374.24℃for TSR.Based on the above research,an aero-engine swirl nozzle with high ther-mal shock resistance has been successfully prepared by ceramic 3D printing technology,which enhances high-temperature resistance and promotes lightweight design in aero-engine.

关 键 词：3D printing Thermal shock resistance Swirl nozzle Flexural strength Ceramic material 

分 类 号：TQ171.733[化学工程—玻璃工业]