Effect of sintering temperature on microstructure and properties of 3D printing polysilazane reinforced Al_(2)O_(3)core  

作　　者：Wen-jun Dong Qiao-lei Li Tian-ci Chen Ming-ke Zou Jing-jing Liang Li-rong Liu Hui Mei Jin-guo Li 

机构地区：[1]School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China [2]Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [3]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China [4]School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China [5]Space Manufacturing Technology(CAS Key Lab),Beijing 100094,China [6]Science and Technology on Thermostructural Composite Materials Laboratory,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an 710072,China

出　　处：《China Foundry》2023年第5期387-394,共8页中国铸造（英文版）

基　　金：This work was financially supported by the 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);Fundamental Research Funds for the Central Universities(WK5290000003);Students'Innovation and Entrepreneurship Foundation of USTC(Nos.CY2022G10 and CY2022C24).

摘　　要：Ceramic cores are the key intermediate components of hollow blades for aero-engine.Conventional processes,such as hot-press molding and gel film casting,face difficulties in fabricating complex-structured ceramic cores due to the complexity of moulds and long process cycles.Stereolithography 3D printing provides a new idea for the fabrication of complex-structured ceramic cores.The effect of sintering temperature on open porosity,bulk density,weight loss rate,shrinkage rate,flexural strength and microstructure of the Al_(2)O_(3)-based ceramic core doped with 10vol.%polysilazane(PSZ)was studied.The sintering mechanism of PSZ-reinforced ceramic cores was analyzed.Results show that the optimum sintering temperature of PSZ-reinforced ceramic cores is 1,450°C.At this temperature,the open porosity of the ceramic core is 36.60%,bulk density is 2.33 g·cm^(-3),weight loss rate is 22.11%,shrinkage rate along the X,Y,Z directions is 5.72%,5.01%,9.61%,respectively;the flexural strength is 28.794 MPa at 25°C and 13.649 MPa at 1,500°C.Properties of 3D printing PSZ-reinforced ceramic cores can meet the casting requirement of superalloy hollow blades,which is expected to promote the industrial application of 3D printing complex structure ceramic cores.

关 键 词：investment casting ceramic core 3D printing sintering temperature flexural strength 

分 类 号：TG221.1[金属学及工艺—铸造]