Ag−P

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Ag−P     

Ag−C

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Ag−C     

Pd／Ag纤维复合材料的制备工艺

用包套拉伸法和挤压法制备Ｐｄ／Ａｇ纤维复合材料，并通过金相和电子显微镜分别观察其微镜分别观察其微观结构，测试其性能，如电阻率，硬度，强度及接触电阻等。通过对比其工艺性及所得材料的微观结构和性能，认为挤压法优于包套拉伸法。此种Ｐｄ／Ａｇ纤维复合材料适合Ｐｄ／Ａｇ型复合铆钉和生产复铜铆钉。     

不同尺寸Mg−Gd−Y−Zn−Ag镁合金零件冷却后的腐蚀行为

研究不同尺寸的Mg?6Gd?3Y?1Zn?0.3Ag(质量分数,％)镁合金零件冷却后的腐蚀行为.小型零件冷却较快,其显微组织由镁基体和粗大的长周期堆垛有序结构(LPSO)相组成.大型零件冷却较慢,其显微组织除镁基体和粗大的LPSO相外,晶粒内部有薄片状LPSO相析出.析氢测试结果表明,大型零件的腐蚀速度高于小型零件.交...     

Ag—10Pd合金超细粉末的制造及应用

将一种化合物加到硝酸银和硝酸钯混合溶液中,共沉淀出中间体,还原得到Ａｇ－Ｐｄ合金粉末。一定条件下再处理,得到Ａｇ－１０Ｐｄ内电极粉末。用该粉末配制的浆料可用于制备性能达到标准的多层陶瓷电容器。     

Production of Ag−ZnO powders by hot mechanochemical processing

Ag–CdO composites are still one of the most commonly used electrical contact materials in low-voltage applications owing to their excellent electrical and mechanical properties. Nevertheless, considering the restriction on using Cd due to its toxicity, it is necessary to find alternative materials that can replace these composites. In this study, the synthesis of Ag?ZnO alloys from Ag?Zn solid solutions was investigated by hot mechanochemical processing. The hot mechanochemical processing was conducted in a modified attritor mill at 138 °C under flowing O₂ at 1200 cm³/min for 3.0 h. The microstructure and phase evolution were investigated using X-ray diffractometry, field emission gun scanning electron microscopy and transmission electron microscopy. The results suggest that it is possible to complete the oxidation of Ag?Zn solid solution by hot mechanochemical processing at a low temperature and short time. This novel synthesis route can produce Ag?ZnO composites with a homogeneous distribution of nanoscale ZnO precipitates, which is impossible to achieve using the conventional material processing methods. Considering the fact that the fundamental approach to improving electric contact material performance resides in obtaining uniform dispersion of the second-phase in the Ag matrix, this new processing route could open the possibility for Ag?ZnO composites to replace non-environmentally friendly Ag?CdO.     

Mechanical behaviour and in situ observation of shear bands in ultrafine grained Pd and Pd–Ag alloys

An in situ tensile test with grey scale correlation has been performed to study the deformation process in ultrafine grained (UFG) Pd and Pd–x at.% Ag (x = 5 or 20) alloys produced by high-pressure torsion. Shear band nucleation and propagation was found to be an important deformation mechanism after strain localization during the tensile test. The underlying microscopic mechanism is related to cooperative grain boundary sliding. Moreover, the additional influence of stacking fault energy was found to change the nature of the deformation mechanism from localized strain in Pd to more homogeneous deformation in Pd–20% Ag. In situ analysis and the findings are new and give innovative insight into the basics of deformation in UFG face-centred cubic metals.     

Effects of trace Ag on precipitation behavior and mechanical properties of extruded Mg−Gd−Y−Zr alloys

The effects of trace Ag element on the precipitation behaviors and mechanical properties of the Mg−7.5Gd− 1.5Y−0.4Zr (wt.%) alloy by means of tensile test, X-ray diffractometry, scanning electron microscopy, electron backscattered diffractometry, and scanning transmission electron microscopy. There is an unusual texture (〈0001〉//extrusion direction) in the extruded Mg−Gd−Y−Zr alloys containing 0.5 wt.% Ag. During the aging periods at 225 °C, the addition of the trace Ag does not form new precipitates, just accelerates aging kinetics, and refines β′ precipitates, thereby increasing the number density of the β′ precipitates by Ag-clusters. Moreover, the Mg−Gd−Y−Zr alloy containing 0.5 wt.% Ag shows the most excellent synergy of strength and plasticity (408 MPa of ultimate tensile strength, 265 MPa of yield strength, and 12.9% of elongation to failure) after peak-aging.     

Enhancement of the glass forming ability of Cu−Zr−Al alloys by Ag addition

The thermal stability and glass forming ability of Cu_50-xZr₄₃Al₇Ag_x (x=0, 1, 3, 5, and 7) bulk metallic glass alloys have been investigated. The glass forming ability in the Cu−Zr−Al−Ag alloys increased proportionally to the Ag content and show good correlations with thermal parameters such as ΔT_x(=T_x-T_g), T_rg(=T_g/T₁) and γ(=T_x/(T_g+T₁)). For the Cu₄₃Zr₄₃Al₇Ag₇ alloy, fully amorphous rods of 8 mm diameter were successfully fabricated by copper mold casting. Mechanical tests on this composition revealed also remarkable properties with compressive strength around 2000 MPa and large ductility.     

Pd—Ag/BZn复合材料及其在微电机上的应用

叙述Pd—Ag/BZn复合材料的制造工艺、性能及其在微电机上的应用。     

多层陶瓷电容器中的Ag─Pd系内电极浆料

从银钯化合物混合溶液中共沉淀中间体，再还原得到Ａｇ─Ｐｄ合金粉。其粒度随Ｐｄ量增加而降低。预氧化处理合金粉，得到表面为氧化钯和银而中心为Ａｇ─Ｐｄ合金的内电极粉。所配制的浆料可用于制备性能达到规定标准的多层陶瓷电容器。     

多层陶瓷电容器中的Ag—Pd系内电极浆料

从银钯合物混合溶液中共沉淀中间体，再还原得到Ａｇ－Ｐｄ合金粉。其粒度随Ｐｄ量增加而降低。预氧化处理合金粉，得到表面为氧化钯和银而中心为Ａｇ－Ｐｄ合金的内电极粉。所配制的浆料可用于制备性能达到规定标准的多层陶瓷电容器。     

Pd／Ag纤维覆铜触点的制备及其金相组织

用ＡＮ１／ＷＳ型卿钉机加工由挤压法和包套法制备Ｐｄ／Ａｇ５２纤维复铜触点，并进行微观结构剖析，指出挤压更适用于ＡＮ１／ＷＳ型卿钉生产复铜触点。寿命试验后微观结构剖析表明，触点在试验过程中始终保持纤维状态，不会明显形成固溶体合金。     

Pd—Ag／AZn复合材料及其在微电机上的应用

叙述Ｐｄ－Ａｇ／ＢＺｎ复合材料的制造工艺、性能及其在微电机的应用。     

Pd／Ag双层膜系统扩散过程的XRD结构深度分布分析

研究了Ｘ射线衍射的结构深度分布分析新方法，该方法以不同的入射角入射，测量各物查的衍射谱，进而解出中确定深度处薄层的Ｘ射线衍射谱，从而可无损和定量地得到各深度处的衍射线的角度位置，强度和线型等全部结构信息，此方法可是到各确定深度处 结构信息，而不是由表面到某深度处的平均结构信息；并且适用于具有择优取向的样品和吸收系数随深度而变化的样品。     

Tribological behaviors of Ag−graphite composites reinforced with spherical graphite

Two kinds of Ag−graphite composites reinforced with spherical graphite (SG) and conventional flake graphite (FG) were prepared by powder metallurgy technology. The effect of graphite morphology on the tribological behavior for the Ag−SG and Ag−FG under the dry sliding wear was investigated with a pin-on-disk tribometer at a load of 3.0 N in atmosphere condition. The results indicated that the minimum wear rate of 3.5×10⁻⁵ mm³/(N·m) for Ag−FG was achieved and it reduced by nearly an order of magnitude, reaching 1.6×10⁻⁶ mm³/(N·m) for the Ag−SG. The obviously different tribological behaviors between the Ag−SG and Ag−FG were closely related to the formation of cracks in the sub-surface. The stress concentration tended to generate at the edges of flake graphite during sliding process, which resulted in the cracks and severe delamination wear of Ag−FG. However, no cracks were found around the spherical graphite in Ag−SG. The spherical graphite can effectively inhibit the initiation and propagation of cracks, achieving high wear resistance.     

碳纳米管−石墨烯增强纳米Ag膏低温连接功率芯片

纳米Ag烧结因具有优异的导热和耐高温性,将是第三代宽禁带半导体芯片封装的理想的连接材料,如何选择合适的第二相以稳定高温服役过程中烧结层组织的演变,是当前Ag烧结技术面临的重要挑战之一.本文采用碳纳米管?石墨烯(CNT-G)来增强纳米Ag焊膏,通过分析烧结组织和接头剪切性能,研究添加相后对烧结接头的影响规律.结果表明:C...     

Pd—50Ag／BZn15—20复合材料的回复热处理

采用示差扫描量热法(DSC)、硬度测量和X-射线衍射分析法研究标题复合材料的回复过程,发现其DSC曲线在70～220℃区间出现回复放热峰.DSC曲线基本上是由Pd-50Ag与BZn15-20合金各自的DSC曲线叠加而成的.指出经150℃/0.5h的热处理后,材料中的第一类应力基本被消除,第二类应力也部分被消除,而硬度基本不变.     

微量硅对Ag—Cu—Pd合金钎焊特性的改进

研究了０．３０￣１．０ｗｔ％Ｓｉ对Ａｇ－２０Ｃｕ－１５Ｐｄ钎料合金钎焊特性之影响，指出：微量Ｓｉ降低其固相线，液相线温度并使其固－液相线间隔变窄。Ｓｉ的添加还提高了Ａｇ－Ｃｕ－Ｐｄ合金在母材Ｆｅ－Ｎｉ－Ｃｏ上的铺展性。