以鹽浴爐硬焊430不銹鋼及6061鋁合金之接合特性影響

本研究以硬焊方式對430不銹鋼與6061鋁合金進行接合，藉此改善散熱能力以便之後應用在煞車碟片上，因目前市面上為了讓煞車碟片重量減輕，採用鋁合金及不銹鋼並以螺栓拴緊方式做結合，但此方式並不能提供良好的散熱能力，並且影響材料使用壽命，因此為求開發出具有良好散熱的煞車碟盤，中間層則選用鋅箔或黃銅箔以不同順序之堆疊進行接合，以510℃、530℃、550℃下中三種不同熱處理溫度並持溫一小時後使用空冷方式進行降溫以完成接合步驟，而在剪應力測試則由550°C下由Al-Z-B-Z-SUS430有最佳之剪應力達到1.57MPa，另外在熱傳導性能測試則由550℃下以Al-Z-B-Z-SUS430接合方式有較好之熱傳導達到13.25W/mK，此外藉由微觀組織及X光繞射儀分析，可發現6061鋁合金與黃銅箔會產生Al_2Cu及AlCu共晶相，此為硬而脆之金屬間化合物，並在截斷面之硬度測試，硬度可達到200HV以上。

關鍵字

異種金屬接合；硬焊；顯微組織；熱傳導；剪應力

並列摘要

In this study, 430 stainless steel and 6061 aluminum alloy were joined by brazing to improve heat dissipation ability for later application to brake discs. Due to the current market, in order to reduce the weight of the brake discs, aluminum and stainless steel are used and bolted together. However this method does not provide good heat dissipation and affects the service life of the material. Therefore, in order to improve the heat dissipation capacity, this study uses brazing to connect stainless steel and aluminum alloy, and the middle layer is selected from zinc foil or brass foil to be stacked in different orders for joining. For joining, three different heat treatment temperatures at 510°C, 530°C, and 550°C were held for one hour, and then the temperature was reduced by air cooling to complete the joining step. In the shear stress test, the best shear stress is reached from 550°C through the air cooling method from Al-Z-B-Z-SUS430 to 1.57MPa. In addition, in the heat conduction performance test, the air-cooled method Al-Z-B-Z-SUS430 has a good thermal conductivity of 13.25 W/mK . Also analyzed by microstructure and X-ray diffraction can be found in the 6061 aluminum alloy and brass foil is generated AlCu and Al_2Cu eutectic phase, which is the hard and brittle intermetallic compounds, and hardness of the cut-off plane of the test Hardness can reach 200HV or more.