(南京航空航天大學 機電學院，南京 210016)
摘 要: 提出一種新的纖維-金屬復合電鑄層——鎢絲-鎳復合電鑄層的電鑄技術，研究脈沖電流、鎢絲體積分數等對復合電鑄層常溫和中溫拉伸性能的影響。結果表明：常溫下，隨著高強度鎢絲的不斷摻入，復合電鑄層的拉伸強度不斷提高，當鎢絲的體積分數達到45%時，拉伸強度達到峰值1 650 MPa；脈沖電流的應用能夠顯著細化鎳晶粒，降低復合電鑄層內部孔隙率，獲得的鎢絲-鎳復合電鑄層拉伸強度比使用普通直流的拉伸強度提高了30%左右；在200、400和600 ℃的中溫條件下，鎢絲-鎳復合電鑄層依然具有很高的拉伸強度，但是隨著溫度的繼續(xù)升高，拉伸強度迅速降低。
關鍵字: 鎳；鎢絲；復合電鑄；拉伸強度；脈沖電鑄
（College of Mechanical and Electrical Engineering,
Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China）
Abstract:A new kind of technology for fiber-metal composite electroformed layer, i.e., W fiber-Ni composite electroformed layer, was presented. The influences of pulse current and W fiber volume fraction on tensile strength of composite coatings at room temperature and middle temperature were investigated. The results show that the final tensile strength of the composite electroformed layer is greatly enhanced with the joining of the W fiber at room temperature. When the volume fraction of the W fiber is 45%, the W fiber-Ni coating has the highest tensile strength of 1 650 MPa. The use of pulse current can refine the Ni grain and reduce the internal pores of the composite electroformed layer. The strength of the W fiber-Ni coating fabricated by pulse current is about 30% greater than by that DC. At the middle temperatures of 200, 400 and 600 ℃, the W fiber-Ni composite electroformed layer still has high tensile strength. But with further increase of temperature, its tensile strength reduces quickly.
Key words: nickel; W fiber; composite electroforming; tensile strength; pulse electroforming
