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TiAl與Si3N4f/Si3N4復(fù)合材料釬焊接頭界面結(jié)構(gòu)及性能研究
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國(guó)家自然科學(xué)基金（50805038）


Research on the Interfacial Structure and Properties of TiAl - Si3N4f/Si3N4 Brazed Joints
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    摘要:

    采用AgCuTi釬料實(shí)現(xiàn)了TiAl與Si3N4f/Si3N4復(fù)合材料的釬焊，確定了釬焊接頭的典型界面組織結(jié)構(gòu)為T(mén)iAl/AlCuTi /Ag(s,s)/TiN/ Si3N4f/Si3N4。釬焊過(guò)程中，液相釬料在Si3N4f/Si3N4復(fù)合材料表面發(fā)生較好潤(rùn)濕，釬料中活性元素Ti與Si3N4基體及纖維發(fā)生反應(yīng)形成連續(xù)的TiN化合物層。過(guò)高的釬焊溫度或過(guò)長(zhǎng)的保溫時(shí)間導(dǎo)致釬縫中脆性的AlCuTi化合物增加，且由于接頭應(yīng)力的作用在釬縫中產(chǎn)生微裂紋甚至開(kāi)裂，嚴(yán)重地降低了釬焊接頭性能。當(dāng)釬焊溫度T=850 ℃，保溫時(shí)間為10 min時(shí)，接頭抗剪強(qiáng)度達(dá)到最大，為9.4 MPa，超過(guò)Si3N4f/Si3N4母材層間抗剪強(qiáng)度的60%。斷口分析表明：壓剪過(guò)程中，斷裂發(fā)生在Si3N4f/Si3N4復(fù)合材料一側(cè)。

    Abstract:

    The TiAl alloy was brazed to Si3N4f/Si3N4 composite using AgCuTi filler metal. The typical interfacial microstructure of the joint is TiAl/AlCuTi reaction layer/Ag based solid solution/TiN reaction layer/Si3N4f/Si3N4. During the brazing process, liquid solder wets the surfaces of Si3N4f/Si3N4 composite well, and the active element Ti reacts with Si3N4 matrix and fibers to form continuous TiN compounds layer. The amount of brittle AlCuTi intermetallics increases when the brazing temperature is much higher or the brazing time is much longer. Some microcracks form in AlCuTi intermetallics due to the residual stress in the joint, which seriously degrade the joining properties. A maximum of 9.4 MPa of the shear strength can be obtained when the brazing temperature T=860 °C and holding time t=5 min, which exceeds 60% of the strength of composite materials. Fracture analysis shows that fracture occurs in the side of Si3N4f/Si3N4 composite.

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宋曉國(guó),曹 健,王義峰,馮吉才. TiAl與Si3N4f/Si3N4復(fù)合材料釬焊接頭界面結(jié)構(gòu)及性能研究[J].稀有金屬材料與工程,2012,41(7):1247~1250.[Song Xiaoguo, Cao Jian, Wang Yifeng, Feng Jicai. Research on the Interfacial Structure and Properties of TiAl - Si3N4f/Si3N4 Brazed Joints[J]. Rare Metal Materials and Engineering,2012,41(7):1247~1250.]
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  • 收稿日期:2011-07-23
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