在炭材料表面通过莫来石(3Al2O3.2SiO2)或锆石(ZrSiO4)氧化物薄膜涂层与SiC的浓度梯度薄层结合,成功地获得了在空气流中1400℃下的高抗氧化性能.在1450℃时,采用将炭材料直接浸入熔融Si金属形成SiC浓度梯度,通过溶胶-凝胶过程形成锆石和莫来石氧化薄膜.水解速率的控制是产生均匀薄膜的关键.具有SiC浓度梯度和莫来石涂层的各向同性高密度石墨块足以在空气中1400 ℃下抗氧化和1400℃到液氮温度下抗淬火.莫来石涂层比锆石涂层更有效.
High oxidation resistance at 1400℃ in a flow of air was successfully obtained by a coating of oxide thin film of either zircon(ZrSiO4) or mullite(3Al2O3.2SiO2)coupled with thin layer with a gradient of SiC concentration on the surface of carbon material.SiC concentration gradient was formed by a direct dipping into a melt of Si metal at 1450℃.Oxide thin films of zircon and mullite were formed through sol-gel process.The control of the hydrolysis rate was a key to the production of a homogeneous thin film.Mullite coating was more effective than zircon coating.The isotropic high-density graphite block with SiC concentration gradient and mullite coating had enough resistance to oxidation at 1400℃ in air and to quenching from 1400℃ to liquid nitrogen temperature.
参考文献
| [1] | Mckee D W .Borate treatment of carbon fibers and carbon/carbon composites for improved oxidation resistance[J].Carbon,1986,24:737. |
| [2] | Mckee D W .Oxidation behavior of matrix-inhibited carbon/carbon composites[J].Carbon,1988,26:659. |
| [3] | Ogawa I;Kobayashi K;Nishikawa S .Oxidation resistance of carbon-ceramics composite materials sintered from ground powder mixtures of raw coke and ceramics[J].Journal of Materials Science,1988,23:1363. |
| [4] | Nixon T D;Cawley J .Oxidation inhibition mechanisms in coated carbon-carbon composites[J].Journal of the American Ceramic Society,1992,75:703. |
| [5] | Kobayashi K;Maeda K;Sano H.High temperature oxidation of carbon/SiC/B4C Composite in different atmospheres[M].Tanso,1992:20. |
| [6] | Filipuzzi L;Gamus G;Naslain R et al.Oxidation mechanisms and kinetics of 1D-SiC/C/SiC composite materials:I An experimental approach[J].Journal of the American Ceramic Society,1994,77:459. |
| [7] | Yamamoto O;Imai K;Sasamoto T et al.Preparation of Carbon material with SiC-concentration gradient by silicon impregnation and its oxidation behaviour[J].Journal of the European Ceramic Society,1993,12:435. |
| [8] | Yamamoto O;Sasamoto T;Inagaki M .Coating of SiC-gradient carbon material with mullite film and its oxidation resistance[J].Journal of the Ceramic Society of Japan,1994,102:165. |
| [9] | Yamamoto O.;Inagaki M.;Sasamoto T. .ANTIOXIDATION OF CARBON-CARBON COMPOSITES BY SIC CONCENTRATION GRADIENT AND ZIRCON OVERCOATING[J].Carbon: An International Journal Sponsored by the American Carbon Society,1995(4):359-365. |
| [10] | Strife J R;Sheehan J E .Ceramic coating for carbon-carbon composites[J].American Ceramic Society Bulletin,1988,67:369. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%