| Coating with boron nitride on SiC fiber using atomic substitution |
Woo‑Seong Tak1,2, Jin‑Uk Hwang1, Young‑Keun Jeong2, Woo‑Sik Kim1
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1Fibrous Ceramics and Aerospace Materials Center, Korea Institute of Ceramic Engineering and Technology, Jinju 52851, Korea
2Graduate School of Convergence Science, Pusan National University, Busan 46241, Korea |
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Received: September 27, 2019; Revised: December 3, 2019 Accepted: December 4, 2019. Published online: February 29, 2020. |
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| ABSTRACT |
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To increase the mechanical properties of ceramic matrix composite, it is important that formation of lubricant layer for crack deflection between matrix and fiber. Therefore, we fabricated uniform boron nitride (BN) lubricant layer using atomic substitution method. Silicon carbide (SiC) fiber surface was modified with amine groups using (3-amonipropyl)triethoxysilane to coat SiC fiber with BN as a solid lubricant. Then, surface was coated with graphene oxide (GO). Boric acid powder was supplied to the GO-coated fibers and the samples were heat-treated at 1200–1400 ℃ under N2 and NH3 atmospheres. An uniform BN layer could be coated on SiC fiber with 10 nm-1.11 μm. Crystallinity and thickness of BN layer could be controlled by reaction temperature. It was also confirmed that crystalline BN formed under process conditions of higher than 1400 ℃. |
| Key words:
SiC fiber · Boron nitride · Graphene oxide · Atomic substitution |
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