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Pt+Hf改性的γ-Ni+γ′-Ni3Al涂層結(jié)構(gòu)及其抗氧化性能研究
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上海市科學(xué)技術(shù)委員會(huì) (10JC1405100，11520701200)；國(guó)家自然科學(xué)基金 (51271107)


Investigation of Microstructures of Pt+Hf Modified γ-Ni+γ′-Ni3Al Coatings and Their Oxidation Resistance
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    摘要:

    通過(guò)包埋Al-Hf共滲在高溫合金DZ417G表面制備出Pt+Hf 共同改性的γ-Ni+γ′-Ni3Al涂層。Al-Hf共滲過(guò)程中，Hf含量不同，涂層表面形成的相結(jié)構(gòu)也不同。當(dāng)滲劑中Hf含量為2%時(shí)(質(zhì)量分?jǐn)?shù), 下同)，涂層呈γ-Ni+γ′-Ni3Al結(jié)構(gòu)；滲劑中Hf含量為6%時(shí)，涂層相結(jié)構(gòu)為b-NiAl+Al16Hf6Ni7；而當(dāng)Hf含量達(dá)到12%時(shí)，涂層相結(jié)構(gòu)為Al16Hf6Ni7。隨著后續(xù)熱處理的進(jìn)行，β-NiAl+Al16Hf6Ni7涂層的相結(jié)構(gòu)轉(zhuǎn)變?yōu)棣?Ni+γ′-Ni3Al；Al16Hf6Ni7涂層轉(zhuǎn)變?yōu)棣?Ni+γ′-Ni3Al+Al3HfNi12結(jié)構(gòu)。1100℃的等溫氧化實(shí)驗(yàn)表明，經(jīng)過(guò)10 h氧化，高溫合金基體表面已經(jīng)出現(xiàn)了脫落；而滲劑中Hf含量為2%時(shí)形成的Pt+Hf改性的γ-Ni+γ′-Ni3Al涂層經(jīng)過(guò)30 h氧化后，其表面依然完整。與單純的Pt改性的γ-Ni+γ′-Ni3Al涂層相比，Pt+Hf共同改性的γ-Ni+γ′-Ni3Al 涂層由于適量活性元素Hf的加入，其抗氧化性能得到了提高

    Abstract:

    The Pt and Hf modified γ-Ni+γ′-Ni3Al coatings were fabricated on the DZ417G superalloy substrates by combined aluminizing and hafnizing using a pack cementation. During the co-deposition process, the phase structure formed on the coating surface changes with the increasing of hafnium contents in packs. When the hafnium contents are 2 wt%, 6 wt% and 12 wt% the coatings consist of the γ-Ni+γ′-Ni3Al, b-NiAl+Al16Hf6Ni7, and Al16Hf6Ni7, respectively. During post heat treatment the β-NiAl+Al16Hf6Ni7 and Al16Hf6Ni7 coatings are transformed to γ-Ni+γ′-Ni3Al and γ-Ni+γ′-Ni3Al+Al3HfNi12. Isothermal oxidation tests at 1100 ℃ for 10 h show that there are a lot of spallation on the surface of the substrate without coating, while the Pt and Hf modified γ-Ni+γ′-Ni3Al coating formed in the packs with 2 wt% Hf remains to be integrated after being oxidized for 30 h. The addition of the reactive element hafnium makes a further improvement on the oxidation resistance of the Pt+γ-Ni+γ′-Ni3Al coatings

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姚培培,付 超,操光輝. Pt+Hf改性的γ-Ni+γ′-Ni3Al涂層結(jié)構(gòu)及其抗氧化性能研究[J].稀有金屬材料與工程,2014,43(1):224~228.[Yao Peipei, Fu Chao, Cao Guanghui. Investigation of Microstructures of Pt+Hf Modified γ-Ni+γ′-Ni3Al Coatings and Their Oxidation Resistance[J]. Rare Metal Materials and Engineering,2014,43(1):224~228.]
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  • 收稿日期:2012-12-17
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  • 在線發(fā)布日期: 2014-04-16
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