High‐Precision Printing of Cermets by Collapsable Matrix Assisted Digital Light Processing

Author:

Shan Yupeng1,Zhao Zhi1ORCID,Wang Haibin1,Li Yurong1,Wang Yue1,Xing Ming1,Song Xiaoyan1

Affiliation:

1. Key Laboratory of Advanced Functional Materials, Education Ministry of China, College of Material Science and Engineering Beijing University of Technology Beijing 100124 China

Abstract

AbstractShaping hard and brittle materials, e.g. cermets, at micrometer resolution has long been known challenging for both mechanical machining and high energy beam based additive manufacturing. Digital light processing (DLP), which features great printing quality and decent precision, unfortunately lacks capability to deal with the popular slurry‐typed cermet precursor due to the tremendous optical absorption by its particles. Here, an innovative protocol based on a versatile collapsable matrix is devised to allow high‐precision printing of WC‐Co cermets on DLP platform. By tuning the external environment, this matrix attenuates composite powders to facilitate photopolymerization at the printing stage, and shrinks to condense green parts prior to thermal sintering. The as‐obtained samples by collapsable matrix assisted DLP can reach a relative density of ≈90%, a record‐breaking resolution of ≈10 µm, and a microhardness of up to 14.5 GPa. Complex delicate structures, including school emblem, honeycomb, and micro‐drill can be directly fabricated, which has never been achieved before. Impressively, the as‐obtained micro‐drill is able to be directly used in drilling tasks. The above strategy represents a great progress in DLP by enabling shaping strong light attenuating materials at high resolution. Such advantages are ideal for the next generation ceramic‐metal composite additive manufacturing.

Funder

National Natural Science Foundation of China

National Key Research and Development Program of China

Publisher

Wiley

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