2-Ti3Al和Ti3Al2等物相組成,Nb只有部分發(fā)生了原位反應(yīng)。N2能夠降低Ti-Al二元反應(yīng)之間的反應(yīng)溫度,提高反應(yīng)速率,對(duì)Ti-Al二元反應(yīng)起催化作用。復(fù)合涂層中沒(méi)出現(xiàn)通常激光熔覆所具有的外延生長(zhǎng)柱狀晶組織,而是形成了細(xì)小的等軸晶組織。"/>

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激光熔覆高鈮Ti-Al金屬間化合物復(fù)合涂層的原位反應(yīng)機(jī)制及其微結(jié)構(gòu)特征
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昆明理工大學(xué),昆明理工大學(xué),昆明理工大學(xué),昆明理工大學(xué),昆明理工大學(xué)

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中圖分類(lèi)號(hào):

TG156.99

基金項(xiàng)目:

國(guó)家自然科學(xué)基金(61368003、11674134)、云南省應(yīng)用基礎(chǔ)研究計(jì)劃重點(diǎn)項(xiàng)目(P0120150044)和云南省中青年學(xué)術(shù)和技術(shù)帶頭人后備人才資助項(xiàng)目(2014HB007)


Microstructure and in situ reaction mechanism of high niobium Ti-Al intermetallic compound composite coating by laser cladding process
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School of Materials Science and Engineering,Kunming University of Science and Technology,School of Materials Science and Engineering,Kunming University of Science and Technology,School of Materials Science and Engineering,Kunming University of Science and Technology,School of Materials Science and Engineering,Kunming University of Science and Technology,School of Materials Science and Engineering,Kunming University of Science and Technology

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    摘要:

    通過(guò)激光熔覆增技術(shù)在BT3-1鈦合金表面制備了高鈮Ti-Al金屬間化合物復(fù)合涂層。根據(jù)差熱(DTA)和熱重(TG)曲線,探討了氬氣和氮?dú)獗Ｗo(hù)下Ti、Al、Nb三種元素混合粉末之間的激光原位合成反應(yīng)機(jī)制。借助X射線衍射(XRD)和掃描電鏡(SEM)分析了復(fù)合涂層的物相結(jié)構(gòu)和微觀形貌。結(jié)果表明：復(fù)合涂層主要由單質(zhì)Nb、金屬間化合物γ-TiAl、α2-Ti3Al和Ti3Al2等物相組成,Nb只有部分發(fā)生了原位反應(yīng)。N2能夠降低Ti-Al二元反應(yīng)之間的反應(yīng)溫度,提高反應(yīng)速率,對(duì)Ti-Al二元反應(yīng)起催化作用。復(fù)合涂層中沒(méi)出現(xiàn)通常激光熔覆所具有的外延生長(zhǎng)柱狀晶組織,而是形成了細(xì)小的等軸晶組織。

    Abstract:

    High niobium (Nb) Ti-Al intermetallic compound composite coating was fabricated on BT3-1 titanium alloy surface by laser cladding process. According to differential thermal analysis (DTA) and thermogravimetry (TG) curves, the laser in situ synthesis reaction mechanism of Ti, Al, Nb three kinds of elements mixed powder under the argon and nitrogen protection was discussed. The phase composition and microstructure of composite cladding coatings were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show the composite coating is mainly composed of Nb elemental and γ-TiAl intermetallic compounds, α2-Ti3Al and Ti3Al2, and Nb is only part of the in situ reaction happened in coating. N2 can reduce the reaction temperature and increase the reaction rate between Ti and Al, and also can promote the reaction between Ti and Al. The laser cladding composite coating does not appear columnar crystal having a laser cladding epitaxial growth characteristics, but produce the fine equiaxed grain structure.

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李正學(xué),劉洪喜,張曉偉,李慶玲,蔣業(yè)華.激光熔覆高鈮Ti-Al金屬間化合物復(fù)合涂層的原位反應(yīng)機(jī)制及其微結(jié)構(gòu)特征[J].稀有金屬材料與工程,2018,47(5):1437~1444.[Li Zhengxue, Liu Hongxi, Zhang Xiaowei, Li Qingling, Jiang Yehua. Microstructure and in situ reaction mechanism of high niobium Ti-Al intermetallic compound composite coating by laser cladding process[J]. Rare Metal Materials and Engineering,2018,47(5):1437~1444.]
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  • 收稿日期:2016-03-12
  • 最后修改日期:2017-02-27
  • 錄用日期:2017-02-28
  • 在線發(fā)布日期: 2018-06-08
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