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La2O3改性ZrB2-SiC涂層C/C復(fù)合材料全溫域抗氧化行為研究
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西北工業(yè)大學(xué)

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TB 332

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國家自然科學(xué)基金資助(51502245); 中央高?；究蒲袠I(yè)務(wù)費專項資金資助(31020019TS0409)


Antioxidant Behavior of La2O3 Modified ZrB2-SiC Coating for C/C Composites at Full Temperature
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    摘要:

    采用高溫反應(yīng)熔滲工藝制備了ZrB2-SiC和La2O3改性ZrB2-SiC涂層C/C復(fù)合材料，對比了兩種涂層試樣在中溫（700-1100℃）、高溫（1200-1500℃）和超高溫（2000℃以上）三個溫域范圍內(nèi)的抗氧化性能。結(jié)果表明：700-1100℃范圍內(nèi)，隨著溫度的升高，La2O3改性涂層試樣的抗氧化性能提升幅度在逐漸提高。1200-1500℃范圍內(nèi)，涂層均表現(xiàn)出良好的長時抗氧化性能，La2O3改性ZrB2-SiC在1200℃下恒溫氧化250 h后，仍保持微量的增重；1500℃下恒溫氧化550h后，失重率僅為0.6 %，這主要是由于氧化過程中涂層表面形成的La-Si-O復(fù)合玻璃層和釘扎相ZrSiO4的協(xié)同作用提升了氧化膜的高溫穩(wěn)定性。在2000℃以上的氧乙炔火焰燒蝕環(huán)境下，La2O3的添加使得ZrB2-SiC涂層的質(zhì)量燒蝕率和線燒蝕率均降低了近50%。

    Abstract:

    ZrB2-SiC and La2O3 modified ZrB2-SiC coated C/C composites were prepared by high temperature reactive infiltration process. The oxidation resistance of the two coated samples in three temperature ranges, i.e. medium temperature (700-1100℃), high temperature (1200-1500℃) and super high temperature (over 2000℃), was compared. The results show that the oxidation resistance of La2O3 modified coatings increases gradually with the increase of temperature in the range of 700-1100 C. The coating exhibited good long-term oxidation resistance in the range of 1200-1500℃. The weight loss rate of ZrB2-SiC modified by La2O3 was only 0.6% after 250 h oxidation at 1200℃ and 550 h oxidation at 1500℃. This is mainly due to the synergistic effect of La-Si-O composite glass layer and pinning phase ZrSiO4 formed on the surface of the coating during oxidation, which improves the high temperature stability of the oxide film. The mass and linear ablation rates of ZrB2-SiC coatings were reduced by nearly 50% with the addition of La2O3 under the flame ablation environment of acetylene and oxygen above 2000℃.

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姚西媛,李賀軍,陳苗苗,馮廣輝. La2O3改性ZrB2-SiC涂層C/C復(fù)合材料全溫域抗氧化行為研究[J].稀有金屬材料與工程,2020,49(1):241~246.[Yao Xi Yuan, Li Hejun, Chen Miaomiao, Feng Guanghui. Antioxidant Behavior of La2O3 Modified ZrB2-SiC Coating for C/C Composites at Full Temperature[J]. Rare Metal Materials and Engineering,2020,49(1):241~246.]
DOI：10.12442/j. issn.1002-185X.20190642

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  • 收稿日期:2019-08-05
  • 最后修改日期:2019-09-11
  • 錄用日期:2019-10-11
  • 在線發(fā)布日期: 2020-02-16
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