热喷涂镍粉在SUS304及A6063基体上的沉积行为

为阐明基体材料对单个颗粒沉积行为的影响,采用大气等离子喷涂技术将镍粉喷涂到镜面研磨后的不锈钢SUS304及铝合金A6063基体上,并通过扫描电子显微镜及聚焦离子束等技术观察在基体上收集的沉积物正面及截面形貌。结果表明:Ni在SUS304基体上呈明显的溅射沉积,单个沉积物的中心部位与周围溅射物相分离,沉积物底部及内部均可见明显气孔,溅射可能是由基体表面的吸附质在熔滴在基体表面铺展过程中脱附所导致。同时,Ni粉在A6063基体上呈现花朵状溅射,中心部位有明显的分层现象,这可能与基体材料的热导率、熔点以及基体表面吸附质的脱附等因素密切相关。

Deformation behavior of A6063 tube with initial thickness deviation in free hydraulic bulging

Experiment on seamless tubes of aluminum alloy A6063 with initial thickness deviation of 0-20% was conducted through a free hydraulic bulging with tube ends free. The influence of initial thickness deviation on the cross-section profile, thickness distribution, maximum internal pressure and maximum radial expansion was investigated. FEM simulation was also performed in order to examine and help explaining the experimental results. The results indicate that the internal pressure and maximum internal pressure appear to be little influenced by the initial thickness deviation, and that the cross-section profile of the bulged tube changes diversely and can not be a perfect circle. The results also suggest that the increase in initial thickness deviation may lead to a remarkable decrease in maximum radial expansion, and a rapid increase in thickness deviation and the center eccentricity of the inner and outer profiles.

铝合金型材及其在电子设备上的应用

从工业用铝合金型材的材料性能、应用特点出发 ,通过与普通钢件的机械性能、加工工艺进行比较 ,显示出铝合金型材自身的优越性 。

铝合金型材在电子专用设备上的应用

从工业用铝合金型材的材料性能、应用特点出发，通过与普通钢件之间的机械性能、加工工艺性的比较，显示出铝合金型材自身的优越性并举例说明其在电子专用设备中的应用。