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標題: 6061鋁合金真空硬銲接合面之機械性能與氣密性
Mechanical Properties and Gas Sealing Capability of 6061 Aluminum Alloy Vacuum Brazing Joints
作者: 廖盛如
Liao, Sheng-Ju
Contributors: 吳威德;陳石法
沈君洋
中興大學
關鍵字: 6061 aluminum alloy;vacuum brazing;mechanical properties;leakage
鋁合金;真空硬銲;機械性能;氣密性
日期: 2008
Issue Date: 2012-09-11 11:31:49 (UTC+8)
Publisher: 機械工程學系所
摘要: 本論文主要探究不同之製程參數對鋁合金6061真空硬銲接合面之機械性能與氣密性之影響。此研究中硬銲之過程採階段升溫,所考慮之變數有中間階段溫度(580℃)下之持溫時間(t580℃=80~130 min)、升溫速率(Rb=1~5℃/min)、銲接溫度(Tb=590~610℃)及銲接溫度下之持溫時間(tb=2~8 min)等四種,所製作之試片乃分別進行拉力、剪力與氣密性之測試,同時試片之銲道處亦經金相觀察。拉力測試之結果發現,升溫速率與銲接溫度對拉伸應力之影響較小,而中間階段溫度(580℃)與銲接溫度(600℃)下之持溫時間兩者對接合面拉伸與剪切應力之影響最大,在製程參數為t580℃=80 min、Rb=1℃/min、Tb=600℃、tb=5 min時,測試之結果顯示,拉伸與剪切應力分別可達到294.7 與112.5 。氣密測試之結果顯示,當銲道厚度小於1 mm後,試棒漏氣之機率即會大幅增加。銲道金相觀察則顯示,銲道中會出現大小不一之空孔,當銲道中大空孔之數量較多時,其相對之拉伸強度反而會較高。
This work deals with the effect of processing parameters on the mechanical properties and leakage at the interface for vacuum brazing of 6061 aluminum alloy. A step-temperature heating process with an intermediate temperature of 580℃ was adopted. Various holding periods at the intermediate step temperature (t580℃=30~130 min), rates of temperature rise (Rb =1~5℃/min), brazing temperatures (Tb =590~610℃) and holding periods at brazing temperature (tb =2~8 min) were considered. The tests of tensile stress, shear stress and leakage for the brazed samples were individually performed. The brazing interfaces were observed using a microscope. The result of the tensile test shows that the effects of Tb and Rb on the tensile stress are insignificant. The t580℃ and tb appears to significantly affect the tensile and shear stresses. For t580℃=80 min, Rb =1℃/min, Tb =600℃ and tb =5 min, the tensile and shear stresses individually reach 294.7 and 112.5 . As the thickness of the brazing sample less than 1 mm, the probability to have a leaking interface will largely increase. The microscopy of the brazing interface indicates that various sizes of cavities appear on the interface. The actual brazed area on the interface for samples with larger cavities would be more than those with smaller cavities. This makes the former possess a larger tensile stress.
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