High temperature self-healing SiBCN ceramics derived from hyperbranched polyborosilazanes

Abstract

Self-healing functionality is an important issue of ceramics or ceramic matrix composites used in high temperature and oxidation environment. In this contribution, we reported the cross significant crack self-healing behaviors and mechanism of SiBCN ceramics derived from hyperbranched polyborosilazanes. The self-healing ability of cracks and indention cross sign are enhanced with the increase of oxidation time. And the temperature also influences the healing self-behaviors. The crack healing and indention sign occurred at 1000°C in air atmosphere. The ceramics with high content of boron show much more obvious self-healing performance because the silicon and boron atoms can be reacted with the available oxygen at high temperature to form SiO 2 (l), B 2 O 3 (l), and B 2 O 3 .SiO 2 . The liquid-like products will fill the crack and prevents the destructive of substrates. The preceramic precursor-derived SiBCN ceramics show good self-healing performance and possess great potential in aeronautics, aerospace, and nuclear power industries.

Promoting healing progress in polymer composites based on Diels‐Alder reaction by constructing silver bridges

“…Polymer materials have been used widely in many fields, including energy storage and conversion, 1‐6 electromagnetic interference (EMI) shielding, 7 thermal management, 8,9 sensors, 10,11 cryogenic temperature, 12 carbon dioxide adsorption, 13 solar cell, 14 energy savings, 15 micro/nano‐manufacturing technology, 16 flame retardants, 17 injection molding, 18 coating, 16,19 biomedicine, 20,21 flexible electronics, 21 aerospace, 22 automotive, 22 and defense industries 22 and so forth, due to their lightweight, low cost, low density, easy processing and flexible. However, it is common fact for polymer materials that those composites are extremely easy to be damaged due to the internal or external factors of polymer materials in the process of actual working 23‐27 . These failures would seriously degrade the functionality and lifetime of the devices, resulting in abundant waste, and safety hazards 28,29 .…”

Self-healing Materials: A Review of Recent Developments

“…At present, once the mobile phone screen is broken, users have to throw it away, which is bound to cause waste, and the application of self-healing materials on the screen will effectively solve this problem. It can be predicted that with the continuous progress of polymer materials design and preparation technology, self-healing materials [128][129][130][131] will also play a key role in the broader field.…”

A review of some of experimental and numerical studies of self‐crack‐healing in ceramics

“…Fei Liu et al reported a high‐temperature healing capability of SiCBN through the oxidation process of the ceramic derived from hyperbranched polyborosilazanes at conditions of 1000°C in an air environment as a result of the high content of boron and silicon in the ceramic. Self‐crack‐healing behavior as demonstrated by Fei Liu et al is shown in Figure 3 below 117 :…”

“…These oxides fill the cracks and prevent further damage of the substrate. 91 Nguyen et al studied the self-healing behavior of ytterbium disilicide. In their study, they reported that the composite (Yb 2 Si 2 O 7 -Yb 2 SiO 5 /SiC) has the ability to heal the cracks.…”