Parameter Optimization via Orthogonal Experiment to Improve Accuracy of Metakaolin Ceramics Fabricated by Direct Ink Writing  

作　　者：Ming Wu Fuchu Liu Yuxiao Lin Miao Wang Shilin Zhou Chi Zhang Yingpeng Mu Guangchao Han Liang Hao 

机构地区：[1]School of Mechanical Engineering and Electronic Information,China University of Geosciences,Wuhan,430074,China [2]Shenzhen Research Institute,China University of Geosciences,Shenzhen,518057,China [3]Advanced Manufacturing Center,China University of Geosciences,Wuhan,430074,China [4]Gemmological Institute,China University of Geosciences,Wuhan,430074,China

出　　处：《Chinese Journal of Mechanical Engineering(Additive Manufacturing Frontiers)》2023年第4期43-58,共16页中国机械工程学报（增材制造前沿）（英文）

基　　金：supported by National Key Research and Develop-ment Program of China(Grant.No.2022YFB4602502);Free Exploration Basic Research Project of Local Science and Technology Development Funds Guided by the Central Government of China(Grant.Nos.2021Szvup158,2021Szvup159);National Nature Science Foundation of China(Grant.No.52375395);Shenzhen Fundamental Research Program of China(Grant.No.JCYJ20220818102601004);Research Project of the Fundamental Research Funds for the Central Universities,China University of Geosciences(Wuhan)(Grant.No.CUG2106346);Science and Technology Reveal System Project of Hubei Province of China(Grant.No.2021BEC010);Research Project of State Key Laboratory of Materials Processing and Die&Mould Technology of China(Grant.No.P2021-020);the Scientific Compass Testing Institute for the SEM images.

摘　　要：Kaolin/metakaolin-insulating ceramic components fabricated using direct ink writing(DIW)have important ap-plication prospects in architecture and aerospace.The accuracy of the entire process including the forming and sintering accuracy of ceramics greatly limits the application scope,and high-accuracy ceramic samples can meet the usage requirements in many scenarios.The orthogonal experiment was designed with four process parame-ters,including nozzle internal diameter,filling rate,printing layer height/nozzle internal diameter,and printing speed,to investigate the evolution of the DIW forming accuracy,sintering shrinkage rate and surface roughness of metakaolin-based ceramics with different process parameters.The influence of each process parameter and its mechanism were analyzed to obtain the DIW parameters for high-accuracy metakaolin ceramics.Multiple linear regression models between the dimensional change rate,surface roughness,and process parameters of the ceramic samples were established and validated.The results show that comprehensively considering the forming accuracy of the ceramic green bodies,sintering shrinkage rate and surface roughness,the optimal DIW process parameters were a 0.41 mm nozzle internal diameter,100%filling rate,50%printing layer height/nozzle inter-nal diameter,and a 15 mm/s printing speed.Multiple linear regression models were developed for the process parameters and the printing accuracy,sintering shrinkage rate and surface roughness.The error rates between the theoretical results obtained by substituting the optimal process parameters into the multiple linear regression models and the actual results obtained by printing the samples with the optimal parameters were extremely small,all less than 0.8%.This verified the correctness and predictability of the multiple linear regression models.This work provides a reference basis for rapid fabrication of high-accuracy ceramics via DIW and accuracy prediction with different process parameters.

关 键 词：Direct ink writing Metakaolin ceramics ACCURACY Multiple linear regression models 

分 类 号：TQ174[化学工程—陶瓷工业]