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AgCu+nano-Al2O3復(fù)合釬料釬焊TC4合金與Al2O3陶瓷：界面結(jié)構(gòu)及接頭性能
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國(guó)家自然科學(xué)基金 (51405099)；中國(guó)博士后科學(xué)基金 (2013M531032)；山東省優(yōu)秀中青年科學(xué)家科研獎(jiǎng)勵(lì)基金 (BS2013CL028)


Brazing TC4 Alloy to Al2O3 Ceramic Using Nano-Al2O3 Reinforced AgCu
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    摘要:

    通過向AgCu共晶釬料中添加nano-Al2O3增強(qiáng)相(2%, 質(zhì)量分?jǐn)?shù))并采用高能球磨的方法獲得了AgCu+nano-Al2O3復(fù)合釬料（AgCuC釬料）。采用AgCuC釬料實(shí)現(xiàn)了TC4合金與Al2O3陶瓷的高質(zhì)量釬焊連接，確定了TC4/AgCuC/Al2O3釬焊接頭的典型界面組織結(jié)構(gòu)為：TC4/α-Ti+Ti2Cu擴(kuò)散層/Ti3Cu4層/Ag(s,s)+Ti3Cu4+TiCu/Ti3Cu4層/Ti3(Cu,Al)3O層/Al2O3。Nano-Al2O3的添加抑制了釬縫中連續(xù)的Ti-Cu化合物層的生長(zhǎng)，同時(shí)在釬縫中形成了顆粒狀Ti-Cu化合物相增強(qiáng)的Ag基復(fù)合材料，改善了釬焊接頭的界面組織。隨著釬焊溫度的升高，各反應(yīng)層厚度逐漸增加，顆粒狀Ti-Cu化合物不斷長(zhǎng)大，Ag基復(fù)合材料組織逐漸細(xì)小。當(dāng)釬焊溫度T=920 ℃，保溫時(shí)間t=10 min時(shí)接頭抗剪強(qiáng)度達(dá)到最大為67.8 MPa，典型斷口分析表明：壓剪過程中，裂紋起源于釬角處并沿釬縫擴(kuò)展后轉(zhuǎn)入Al2O3陶瓷，最終在Al2O3陶瓷母材側(cè)發(fā)生斷裂

    Abstract:

    A nano-Al2O3 reinforced AgCu composite filler (named AgCuC) was developed by introducing nano-Al2O3 (2 wt%) into AgCu eutectic powder filler and then by high-energy ball milling. High-quality brazing of TC4 alloy to Al2O3 ceramic was achieved using the AgCuC filler. The typical interfacial microstructure of TC4/AgCuC/Al2O3 joint was TC4/α-Ti+Ti2Cu diffusion layer/Ti3Cu4 reaction layer/Ag(s,s)+Ti3Cu4+TiCu/Ti3Cu4 reaction layer/Ti3(Cu,Al)3O reaction layer/Al2O3. The addition of nano-Al2O3 in AgCuC filler could improve the interfacial microstructure by constraining the growth of continuous Ti-Cu intermetallic layers. Moreover, granular Ti-Cu phases reinforced Ag based composite is formed in brazed joint. Both the thickness of reaction layers and the size of granular Ti-Cu phases increase with an increasing brazing temperature, while the content of Ag based composite decreases. The highest shear strength of 67.8 MPa is achieved when brazed at 920 °C for 10 min. Typical fracture analyses show that the crack originates in the fillet, extends along the brazing seam and then transforms into Al2O3 ceramic, and finally fractures in the Al2O3 substrate side

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趙一璇,王美榮,宋曉國(guó),唐冬雁,馮吉才,王 昕. AgCu+nano-Al2O3復(fù)合釬料釬焊TC4合金與Al2O3陶瓷：界面結(jié)構(gòu)及接頭性能[J].稀有金屬材料與工程,2015,44(4):922~926.[Zhao Yixuan, Wang Meirong, Song Xiaoguo, Tang Dongyan, Feng Jicai, Wang Xin. Brazing TC4 Alloy to Al2O3 Ceramic Using Nano-Al2O3 Reinforced AgCu[J]. Rare Metal Materials and Engineering,2015,44(4):922~926.]
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  • 收稿日期:2014-04-21
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  • 在線發(fā)布日期: 2015-06-08
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