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利用相变超塑性现象 ,在自制的电阻加热扩散连接试验机上 ,对扩散连接的方法以及热作模具钢 3Cr2W8V与H13扩散连接接头的性能进行了试验研究 ,分析了不同条件对接头显微组织和连接效果的影响。结果表明 :本试验条件下按优选工艺参数连接的试样在拉断试验时 ,断裂发生在基体处 ,表明接头强度已不低于基体强度 相似文献
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利用相变超塑性现象,在自制的电阻加热扩散连接试验机上,对扩散连接的方法以及热作模具钢3Cr2W8V与H13扩散连接接头的性能进行了试验研究,分析了不同条件对接头显微组织和连接效果的影响。结果表明:本试验条件安优选工艺参数连接的试样在拉断试验时,断裂发生在基体处,表明接头强度已不低于基体强度。 相似文献
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The amorphous/polycrystalline Si3N4/CrN nancrstructured multilayer films have been prepared by radio frequency (RF) reactive magnetron sputtering. The composition, microstructure and mechanical properties of these films were characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM) and nano-indentation. The CrN and Si3N4 single layer films are polycrystalline face centered-cubic and amorphous structures, respectively. The CrN and Si3N4 layers are nearly stoichiometric. The HRTEM image indicates that the interfaces are planar and modulation structure is clear in multilayers. The hardness values of Si3N4/CrN multilayers are between those of the constituent CrN and Si3N4 films at a substrate temperature of 20℃, and are somewhat higher than those of Si3N4 films at a deposition temperature of 500℃. There is no superhardness effect in the Si3N4/CrN multilayers. Based on the experimental results, the hardening mechanisms in the multilayers have been discussed. 相似文献
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研究了纯镍及其表面磁控溅射Ni 0 5Y微晶涂层在 10 0 0℃空气中的恒温氧化和循环氧化行为。通过扫描电镜(SEM)和透射电镜 (TEM)对涂层以及表面NiO膜的形貌和结构进行了研究。此外 ,还用激光拉曼 (Raman)谱对两种样品表面NiO膜内应力大小进行了测量。结果表明 ,Ni 0 5Y微晶涂层与基体镍相比有更低的氧化增重速率 ,表面NiO氧化膜的晶粒尺寸明显减小 ,膜的高温塑性得以改善。同时 ,氧化膜内的压应力水平也有所降低 ,因而改善了NiO膜的粘附性和保护性。磁控溅射涂层的微晶结构以及稀土元素Y的存在均有助于提高涂层的抗高温氧化性能 相似文献
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