Laminates with alternating layers of NiCoCrAlY and NiCr were fabricated by using electron beam physical vapor deposition (EB-PVD) method. The influence of the substrate temperature on morphology of the laminates was i...Laminates with alternating layers of NiCoCrAlY and NiCr were fabricated by using electron beam physical vapor deposition (EB-PVD) method. The influence of the substrate temperature on morphology of the laminates was investigated. The results show that in order to produce NiCoCrAlY/NiCr laminates with lower porosity, higher substrate temperature is required. The mechanical properties of the as-deposited samples and heat-treated samples were examined using tensile tests. The stress-strain curve of the as-deposited laminate shows a typical characteristic of multilayered materials and the fracture behavior is improved by annealing the samples at high temperatures. The tensile strength of the samples annealed at 760℃ is 658.4MPa, and the elongation reaches 6.2%.展开更多
本文介绍了使用SPDR(Split Post Dielectric Resonator)法研究高频下,湿热环境对覆铜板基材介电常数Dk和介电损耗角正切Df的影响,用恒温恒湿处理箱,将温湿度设为85℃和85%RH处理样品,并分别测出处理前后的Dk和Df值。使用此方法,对普通F...本文介绍了使用SPDR(Split Post Dielectric Resonator)法研究高频下,湿热环境对覆铜板基材介电常数Dk和介电损耗角正切Df的影响,用恒温恒湿处理箱,将温湿度设为85℃和85%RH处理样品,并分别测出处理前后的Dk和Df值。使用此方法,对普通FR-4、无卤FR-4、Low Dk FR-4进行了测试,效果良好。展开更多
文摘Laminates with alternating layers of NiCoCrAlY and NiCr were fabricated by using electron beam physical vapor deposition (EB-PVD) method. The influence of the substrate temperature on morphology of the laminates was investigated. The results show that in order to produce NiCoCrAlY/NiCr laminates with lower porosity, higher substrate temperature is required. The mechanical properties of the as-deposited samples and heat-treated samples were examined using tensile tests. The stress-strain curve of the as-deposited laminate shows a typical characteristic of multilayered materials and the fracture behavior is improved by annealing the samples at high temperatures. The tensile strength of the samples annealed at 760℃ is 658.4MPa, and the elongation reaches 6.2%.
