Achieving Super‐Metallophobicity on Silicon‐based Ceramics at High Temperature

Abstract As a critical concept in physical chemistry, superwettability is widely concerned in both fundamental science and practical engineering in past few decades. Despite this, investigation on high temperature superwettability is still a void, which is significant both in scientific and industrial fields. Herein, a ceramic with specific high temperature non‐wetting property, Si 2 N 2 O is proposed. Compared with other materials, Si 2 N 2 O is elucidated with better practical non‐wetting property against various non‐ferrous metals. Combining with micro‐nanostructures, the metallophobicity is further improved (contact angle >150° and contact angle hysteresis ≈0°). The extraordinary metal repellency is defined as “super‐metallophobicity”, which is proved to be induced by distinctive thermodynamic and dynamic wetting behavior on the rough surface. The research of super‐metallophobicity not only sheds light on superwettability at high temperature, but also offers worthy insights for future potential material design in a wide range of applications, such as metallurgy, 3D printing and semiconductor industry.