Effect Of Ag Content Research Articles

Effect of Ag Content on the Optical Properties of a- Ge15 Se85-x Agx Alloys

Effect of Ag Content on the Optical Properties of a- Ge15 Se85-x Agx Alloys

Influence of Ag Content and H2S Exposure on 1,3-Butadiene/1-Butene Adsorption by Ag Ion-Exchanged Y-Zeolites (Ag−Y)

It was found earlier in our laboratories that Ag ion-exchanged zeolite was capable of purifying 1-butene by selective adsorbing trace amounts of 1,3-butadiene. The effect of Ag content in Ag ion-exchanged Y-zeolite (Ag−Y) on 1,3-butadiene/1-butene adsorption was investigated using Ag−Y with different Si/Al ratios and different degrees of Ag+/Na+ exchange (AgNa−Y). AgNa−Y with a Ag content of 34 Ag/u.c. exhibited excellent adsorption performance in terms of both separation factor and uptake rate. The influence of H2S exposure on sorbent performance was also examined. Although both 1,3-butadiene and 1-butene adsorption amounts were decreased by H2S exposure, the separation factors remained well over 100, which were still good for purification. XPS analysis revealed that Ag+ in Ag−Y reacted with H2S to form Ag2S. The high selectivity for butadiene over 1-butene was indicative of the π-complexation ability of Ag2S. This work demonstrated that (1) an intermediate silver loading was the best for 1,3-butadiene/1...

Transient and Steady State Creep of Al-10 wt% Ag and Al-22 wt% Ag Alloys Containing ??- and ?-Precipitates

Al-10 wt% Ag and Al-22 wt% Ag alloys were used to trace the effect of Ag content on the behavior of both transient and steady state creep. After solid solution treatment, specimens of both alloys were aged at 563, 613 and 683 K for different periods of time (5-120 min) and creep tests were performed at different testing temperatures (353-413 K) by applying a stress of 115 MPa. A higher Ag content in the Al-Ag system is assumed to accelerate the rate of dissolution of GP zones and the rate of formation and growth of γ'- and γ-precipitates which generally reduced the creep rate, a matter that is confirmed by TEM investigations. Values of the activation energy of the mechanisms operating in both transient and steady state stages were found in the range of 10-23 kJ/mol and 40-55 kJ/mol, respectively.

Effect of Ag Content on Properties of Sn-Ag Binary Alloy Solder

Sn–Ag binary alloys, with Ag content in the range between 0 mass% and 4.0 mass%, were examined in order to understand the effect of Ag addition on microstructural and mechanical properties of the solders. Fine Ag3Sn fibrous precipitates form the Ag3Sn/Sn eutectic network surrounding the β-Sn primary grains. Increasing Ag content produces finer precipitates and finer networks. Sn–4.0 mass%Ag has additional large Ag3Sn primary particles. Thermal expansion coefficient of the alloy decreases with increasing Ag content. The 0.2% proof stress of Sn–Ag alloy increases with increasing Ag content up to 4.0 mass%Ag, and is higher than that of Sn–37 mass%Pb solder above 2.0 mass%Ag. In contrast, tensile strength increases up to 3.5 mass%Ag but decreases at 4.0 mass%Ag slightly. The formation of primary Ag3Sn is attributed to the degradation at 4.0 mass%Ag. The wettability of the Sn–Ag alloys on Cu is slightly improved by the Ag addition but is worse than Sn–37 mass%Pb solder. Two intermetallic layers are formed at the interface, Cu3Sn adjacent to Cu and Cu6Sn5 adjacent to the solder. The Cu6Sn5 layer is thicker than the Cu3Sn layer and grows into the solder forming scallop shape. The thickness of the reaction layers slightly increases with increasing Ag content. The composition of Sn–(2–3.5 mass%)Ag is the best selection for obtaining high joint strength. Sn–Ag alloy is superior to Sn–37 mass%Pb solder for establishing a rigid interface.

Microstructure and its influence on thermal and electrical conductivity of ZrO 2–Ag composites

The effects of Ag content on the thermal diffusivity and conductivity of the ZrO 2–Ag composites were investigated. Experimental results showed a significant increase in thermal conductivity at Ag≥∼10 vol.%, which was primarily due to the formation of continuous Ag phase and a direct evidence was confirmed by a precipitous drop in electrical resistivity. The formation of interconnected Ag phase made the thermal conductivity of the ZrO 2–Ag composites far beyond theoretical expectation.

Effect of Ag content on the yield strength of Pb (Ag) alloys at 77 K

Effect of Ag content on the yield strength of Pb (Ag) alloys at 77 K