Browse Topic: Metal finishing
In the realm of low-altitude flight power systems, such as electric vertical take-off and landing (eVTOL), ensuring the safety and optimal performance of batteries is of utmost importance. Lithium (Li) plating, a phenomenon that affects battery performance and safety, has garnered significant attention in recent years. This study investigates the intricate relationship between Li plating and the growth profile of cell thickness in Li-ion batteries. Previous research often overlooked this critical aspect, but our investigation reveals compelling insights. Notably, even during early stage of capacity fade (~ 5%), Li plating persists, leading to a remarkable final cell thickness growth exceeding 20% at an alarming 80% capacity fade. These findings suggest the potential of utilizing cell thickness growth as a novel criterion for qualifying and selecting cells, in addition to the conventional measure of capacity degradation. Monitoring the growth profile of cell thickness can enhance the
This SAE Standard defines the method for deriving and verifying the peening intensity exerted onto a part surface during shot peening or other surface enhancement processes
Anode-free sodium metal batteries (AFSMBs) with initial zero sodium anodes are promising energy-storage devices to achieve high energy density and low cost. The morphology and reversibility of sodium controls the cycling lifespan of the AFSMBs, which is directly affected by the separator. Here, we compared the sodium deposition and corresponding electrochemical behaviors under the influence of three commercial separators, which were Celgard 2500, Al2O3-coated PP separator and glass fiber (denoting as 2500, C-PP and GF). Firstly, the reversibility of sodium plating/stripping was tested using half-cells, where coulombic efficiencies were stable at ~99.89% for C-PP and GF compare to 99.65% for 2500, indicating more dead sodium were formed for 2500. Then, the morphologies of deposited sodium were compared using optical microscopy. Compared to inhomogeneous sodium growth under 2500, C-PP obtained more flatter sodium layer with less height difference, attributing to the high mechanical
This specification covers the requirements for electrodeposited bronze plate and its subsequent removal
This specification covers metric aircraft quality spacers for use as positioners for tubes, flat washers for use as load spreaders, galling protection of adjacent surfaces and or material compatibility, and key or tab washers for use as locks for bolts, nuts, and screws
This specification covers the requirements for electroless nickel with phosphorus deposited on various materials
This specification covers the requirements for an electrodeposit of cadmium diffused into an electrodeposit of nickel on carbon, low-alloy, and corrosion-resistant steels
This specification covers the requirements for electrodeposition of tin on metals and the properties of the deposit
A research team from Pohang University has successfully enhanced the performance and durability of all-solid-state batteries. This breakthrough was made possible through the implementation of a novel approach known as bottom electrodeposition
This specification covers the requirements for electrodeposited zinc-nickel on metal parts, including fasteners and other standard parts
The complete requirements for procuring the product shall consist of this document and the latest Issue of the basic specification, AMS2431
This specification covers pyrometric requirements for equipment used for the thermal processing of metallic materials. Specifically, it covers temperature sensors, instrumentation, thermal processing equipment, correction factors and instrument offsets, system accuracy tests, and temperature uniformity surveys. These are necessary to ensure that parts or raw materials are heat treated in accordance with the applicable specification(s
This specification defines the requirements for in-process correction of foundry discontinuities by manual welding of castings
This document establishes the requirements for the sequencing of processes relating to parts fabricated from 300M or 4340 modified steel heat treated to, or to be heat treated to, 270,000 psi (1860 MPa) minimum ultimate tensile strength (UTS) and higher
For years, expertise in terrestrial applications has served as a launchpad for innovation. Companies honed their skills by building the networks that connected us on earth, but now, eyes are turning skyward. By adapting their capabilit ies to the unique demands of non-terrestrial applications, these same players are unlocking new possibilities and rewriting the rules of communication beyond the atmosphere. Here, Dan Rhodes, Director of Business Development at designer and manufacturer of RF-to-mmWave components and subsystems, Filtronic, explores the bridge between terrestrial expertise and non-terrestrial ambitions, highlighting how terrestrial success is becoming the fuel for stellar solutions. Bridging the terrestrial and non-terrestrial worlds is not merely a matter of applying existing technologies to a new canvas. While both environments share fundamental principles of communication and rely on robust components such as transmitters, receivers, filters and amplifiers, the shift
This SAE Aerospace Recommended Practice (ARP) addresses the general procedure for the best practices for minimizing uncertainty when calibrating thermal conductivity and cold cathode vacuum gauges, which includes the vacuum sensor(s) and accompanying electronics necessary for a pressure measurement to be made. It also includes the best practices for an in-process verification where limitations make it impossible to follow the best practices for minimizing uncertainty. Verifying the accuracy and operation of vacuum gauges is critical to ensure the maintenance of processes while under vacuum
This specification establishes the requirements for a hard anodic coating on aluminum and aluminum alloys
This specification establishes nondestructive testing methods, sampling frequency, and acceptance criteria for the inspection of metal castings
This specification covers the requirements for a layer of electrodeposited silver followed by a layer of electrodeposited rhodium
This specification establishes the engineering requirements for producing an acid-type, anodic coating on magnesium alloys and the properties of the coating
This specification covers requirements for silver deposited on metal parts with a nickel strike between the basis metal and the silver deposit
This document provides a recommended practice for determining decarburization and carburization in heat treated carbon and low-alloy steel parts other than case hardened parts. It is not applicable to raw materials
This specification covers the requirements for electrodeposited zinc plating
This specification covers the requirements for vacuum deposited cadmium
This specification establishes the requirements for a chemical conversion coating on titanium alloys
This specification covers the requirements for qualification, requalification, and certification of etch inspectors
This specification covers a procedure for revealing the macrostructure and microstructure of titanium alloys
This specification establishes the engineering requirements for producing an acid-type, anodic coating on magnesium alloys and the properties of the coating
This specification covers the requirements for ion vapor deposited (IVD) aluminum on steel, titanium, and aluminum alloys
This specification covers an aluminum alloy in the form of bars, rods, and wire
This specification covers characteristics for chemistry, microstructure, density, hardness, size, shape, and appearance of zirconium oxide-based ceramic shot, suitable for peening surfaces of parts by impingement
This specification covers engineering requirements for the grinding of tungsten carbide high velocity oxygen/fuel (HVOF) thermal spray coatings applied to high strength steels (220 ksi and above
Engineers, managers, technicians and other automation professionals at most manufacturers understand the value of pretreating metal surfaces of parts to remove corrosion, grease, residue, old coatings, or to roughen the surface of metals prior to coating. By ensuring the items are cleaned down to bare metal, manufacturers can avoid costly warranty issues that result when coatings peel, flake, bubble, or otherwise fail prematurely
Improvements in component/system design is a daily challenge these days, always looking for high performance, reduced mass and low costs. The source for the best fit between these factors, coupled with adequate durability performance, is crucial to the success of a given product and this is what motivates engineering teams around the world. The demand for efficient projects with short deadlines for validation and certification is huge and simulation tools focused on accelerated durability and virtual validation are increasingly being used. When developing a new spring for commercial vehicles, lessons learned from the actual loads applied to the suspension are the “key” to a successful project. The loads/stresses from the ground (vertical loads, lateral loads, longitudinal and braking loads) are quite high and, consequently, relevant to the proper definition of the design of the suspension components. The objective of this work is to describe the main development activities faced during
This SAE Recommended Practice pertains to blast cleaning and shot peening and provides for standard cast shot and grit size numbers. For shot, this number corresponds with the opening of the nominal test sieve, in ten thousandths of inches1, preceded by an S. For grit, this number corresponds with the sieve designation of the nominal test sieve with the prefix G added. These sieves are in accordance with ASTM E11. The accompanying shot and grit classifications and size designations were formulated by representatives of shot and grit suppliers, equipment manufacturers, and automotive users
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