Materials Literature
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ABSTRACT In 2006, the European Union RoHS legislation prohibited the use of lead in many electronic systems. This has resulted in increased use of pure tin finishes and tin rich lead-free alloys in aerospace and defense electronic systems. While aerospace and defense are currently exempt from the RoHS legislation, the…
ABSTRACT Printed circuit board design and expected performance is driven today by three main markets; high functioning portable devices, infrastructure to support these portables and the ever increasing demand from the automotive industry for increased electronic content in automobiles. These technology areas both req…
ABSTRACT An IPC specification is a consensus document that specifies attributes relevant to the plated surface. Plating specifications are designed to be applicable to a wide range of products types. As product continues to evolve and new product types are needed, it is necessary for the committee to periodically revi…
ABSTRACT As the aerospace electronics industry becomes increasingly more reliant on COTS surface mount processors (FPGAs, CPUs, etc.) with demanding thermal dissipation requirements and packaging optimized for convection cooling (top heat-sinked devices), thermal designers have been driven to broaden their search in t…
ABSTRACT Package on Package (PoP) components offer a low cost, high performance solution for stacking of a logic device with memory. There are a number of challenges in the final assembly at the Electronic Manufacturing Services (EMS) facility. An assembly process has been developed for a Bond Via Array (BVA) PoP pack…
ABSTRACT The Tin-silver copper alloy SAC305 is the most commonly used in lead-free electronic assembly, especially in SMT process. Due to the evolution and the diversification of assembly technologies, needs for suitable lead-free alternative alloys have appeared. While remaining a relatively small market, the demand…
ABSTRACT Mixed Flow Gas (MFG) testing is an industry standard for field corrosion risk evaluation. Based on extensive data collected in the late 20th century, test conditions and gas constituents for MFG test exposure were established for qualification of connectors against corrosion that they may see in the field. Ho…
ABSTRACT The influence of surface finishes and solder alloys on the solder ball joint reliability after multiple reflow cycles and thermal aging were investigated by conducting a high-speed solder ball shear test. In the case of SAC305, It was found that the electroless Ni/Pd/Au provided excellent reliability comparab…
In this paper, a thermal-based dynamic model of a Solid Oxide Fuel Cell under different direct current load conditions is improved by using our previously developed fuel cell model, which includes ohmic, activation and concentration voltage losses, thermal dynamics and methanol reformer. The modified Solid Oxide Fuel…
In the present communication, the effect of mercerization or alkali (NaOH) treatment on mechanical and wear behavior of chopped Roselle fiber-reinforced vinyl ester (CRFRV) composite have been studied as the function of fiber content. The results show that the tensile, flexural and impact strength values of untreated…
Amine by itself is alkaline and generally not corrosive; however, in the presence of sour gases such as hydrogen sulfide (H2S) and carbon dioxide (CO2), which can be stripped out of feed gas, off-gas, and olefinic and saturated liquefied petroleum gas, the solution becomes extremely corrosive. The corrosiveness is def…
A criterion for evaluating the efficiency of corrosion inhibitors for metallic samples in aqueous solutions is proposed for the first time. The derivation of this criterion was based on calculating the limit of the ratio of the resistivity of a carbon steel (CS) sample in inhibited seawater (ρins) to the resistivity o…
The results of studies of new laws governing the distribution of endogenous industrial uranium deposits of Kirovogradsky uranium ore district and industrial Li and Та-Li deposits of Shpolyano-Tashlyksky ore district of the Ukrainian shield in close connection with the peculiarities of deep structure of lithosphere and…
The toughening of epoxy resins with the addition of organic or inorganic compounds is of great interest nowadays, considering their large scale of applications. In the present work, composites of epoxy are synthesized with kaolin particles having different particle sizes as reinforcement. Composites of epoxy with vary…
The paper deals with the experimental investigation of combustion operating parameters and burner’s constructional parameters on the formation of nitrogen oxides. The tests were performed using the burner prototype with the maximal capacity of 1.5 MW. The burner is both fuel-staged and air-staged. During the testing c…
In addition to high hardness, Ni-P coatings obtained by the electroless method are widely used due to their high corrosion resistance. The corrosion resistance depends on the content of phosphorus in the coating. Various phosphorus contents result from changes in pH in the process of obtaining layers. The layers obtai…
As part of the economy, metallurgy must address the problem of product \nquality in all aspects, especially in view of the the usage properties and physico-mechanical \ncharacteristics. The paper deals with vacuum melting \nprocesses used to eliminate gases and inclusions from both small amounts of \nmolten steel and…
A simple, original method of producing cold deformed (hard-wrought) structural middle carbon alloys work pieces for next producing impact test samples are proposed. This method saves the metal and can significantly to reduce a consumption of the tungsten-carbide inserts.
Abstract Background: Thrombotic microangiopathy (TMA) is a rare syndrome that leads to excessive formation of blood clots, microthrombosis and is accompanied by non-autoimune haemolytic anemia and thrombocytopenia. Only few cases describing TMA caused by cancer are being reported in the literature. Patient: A 42-year…
Silver nanowires were pulse electrodeposited into nanopore anodic alumina \noxide templates. The effects of continuous and pulse electrodeposition \nwaveform on the microstructure properties of the nanowire arrays were \nstudied. It is seen that the microstructure of nanowire is depend to pulse \ncondition. The off ti…