Improved thermal stability of SiBCN ceramics by lowering nitrogen content
Source abstract
Abstract
Polymer-derived SiBCN ceramics are well known for their outstanding thermal stability. Although they possess outstanding thermal stability, SiBCN ceramics are easily to decompose out Si3N4 and SiC crystalline phases at high temperature leading to thermal stability worsen. Here, to reduce the Si3N4 crystallization precipitation in SiBCN ceramics, the N contents are reduced from 25 to 8.09 wt%, 11.44 and 14.51 wt%, by adding polycarbosilane into polyborosilazane, respectively. The experimental results illustrated that the precipitation temperature of Si3N4 phase in modified S1–S3 ceramics increased to 1800 °C which was higher than that of S0 ceramics (1600 °C). The results indicated that the crystalline precipitation of Si3N4 in SiBCN ceramics can be suppressed at a high-temperature environment via declining N content, which may provide a new strategy for decreasing carbothermal reduction. In addition, the original SiBCN ceramic had a weight change of 31.7% at T > 1800 °C, while the weight change of modified SiBCN ceramics significantly reduced to 15.7 ~ 19.5%, which attributed to the decrease in carbothermal reduction.
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Research context
OpenAlex topics: Advanced ceramic materials synthesis · Advanced materials and composites · MXene and MAX Phase Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (39)
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