炭化ケイ素傾斜炭素材のムライト被覆とその耐酸化性

概要

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The optimum conditions for mullite coating on SiC gradient carbon substrates and its oxidation resistance were studied. A homogeneous precursor solution with the composition of Al/Si = 3 was prepared by refluxing an ethanol solution of Al (NO_3)_3 and silicon ethoxide (TEOS) of 0.1 mol/1 at its boiling point for 12h. A mullite film with a thickness of 1.0 pln without any cracks was obtained under the following conditions; the drawing up the substrate from the precursor solution at a rate of 0.05 cm/s, keeping at room temperature for 24h and at 100℃ for 48h in air, and then heating up to 1300℃ at a rate of 200℃/h. The SiC gradient carbon substrates coated with the mullite film showed the excellent oxidation resistance; no appreciable weight loss by oxidation at 1000℃ for 15h was observed.
社団法人日本セラミックス協会の論文
1994-02-01