【摘要】：鈦銅復合棒在電解及氯堿制造等工業(yè)中得到了廣泛的應用。目前制備鈦銅復合棒的方法主要為爆炸焊接+軋制復合法和擠壓+拉拔復合法。本文首次提出了用直接擠壓法制備鈦銅復合棒,并設(shè)計出滿足要求的擠壓模具,研究了直接擠壓復合法制備鈦銅復合棒的工藝參數(shù)及界面結(jié)合機理。 根據(jù)鈦、銅兩種金屬的加工特性,結(jié)合產(chǎn)品斷面尺寸,從材料選定、模具外形、模角、孔型、入口圓角R、工作帶長度、延伸孔型系統(tǒng)等方面入手,設(shè)計出了φ32×14×1.5mm鼓形、68×11×1.5mm矩形的兩種鈦銅復合棒擠壓模具。在研究擠壓工藝參數(shù)對擠壓復合過程的影響時,重點探討了擠壓溫度以及擠壓速度的影響。實驗表明,在760℃~800℃溫度范圍內(nèi),以80mm/s~120mm/s的速度,擠壓過程能夠順利進行。為了防止發(fā)生共晶反應,擠壓溫度不應超過820℃;否則會造成界面生成有害的金屬間化合物,影響界面質(zhì)量。 直接擠壓法制備的鈦銅復合棒表面光潔,覆層鈦厚度均勻。通過對擠壓法制備的鈦銅復合棒界面進行金相組織分析,經(jīng)超聲波檢測、拉剪實驗、顯微硬度等進行表征,并比較結(jié)合強度,其結(jié)合強度與純銅的拉伸強度接近,證明其復合界面實現(xiàn)了冶金結(jié)合。直接法制備鈦銅復合棒主要有兩種結(jié)合機理:一種為機械作用機制,主要通過擠壓力作用使鈦銅兩種金屬在強烈的三向壓應力作用發(fā)生強烈的塑性變形,表面擴展產(chǎn)生新鮮表面而實現(xiàn)初步結(jié)合,新鮮表面的多少是影響擠壓結(jié)合的主要因素之一,這可以通過金屬擠壓比的調(diào)整得以改善;第二種結(jié)合機理為擴散機制,主要在擠壓復合后冷卻退火過程中,隨著擠壓溫度的升高,擴散過程進行的較充分。 理論分析和實驗研究表明,用直接擠壓法制備鈦銅復合棒的工藝是可行的,并且也是較好的一種復合方法。所設(shè)計的擠壓模具有效合理,制備的鈦銅復合棒各方面性能均滿足GB/T12769-2003技術(shù)標準要求。研究得到的數(shù)據(jù)對大規(guī)模擠壓制備鈦銅復合棒具有一定的指導意義。
[Abstract]:Titanium-copper composite rod has been widely used in industry such as electrolysis and chlor-alkali manufacturing. At present, the main methods of preparing Ti-Cu composite rod are explosive welding rolling method and extruding drawing composite method. In this paper, titanium-copper composite rod was prepared by direct extrusion method for the first time, and extrusion die was designed to meet the requirements. The technological parameters and interface bonding mechanism of titanium-copper composite rod prepared by direct extrusion composite method were studied. According to the processing characteristics of titanium and copper, the 蠁 32 脳 14 脳 1.5mm drum shape is designed from the aspects of material selection, die shape, die angle, pass type, inlet fillet R, length of working band, extended pass system and so on according to the processing characteristics of titanium and copper, combined with the cross section size of the product. Two kinds of extrusion dies for titanium-copper composite rod with 68 脳 11 脳 1.5mm rectangle were developed. In order to study the influence of extrusion process parameters on extrusion process, the effects of extrusion temperature and extrusion speed are discussed. The experimental results show that the extrusion process can proceed smoothly at the speed of 80mm/s~120mm/s in the temperature range of 760C ~ 800C. In order to prevent eutectic reaction, the extrusion temperature should not exceed 820 鈩，

本文編號：2442354