Citation
(2015), "New materials and equipment", Anti-Corrosion Methods and Materials, Vol. 62 No. 6. https://doi.org/10.1108/ACMM.12862faa.002
Publisher
:Emerald Group Publishing Limited
New materials and equipment
Article Type: New materials and equipment From: Anti-Corrosion Methods and Materials, Volume 62, Issue 6
New long-lasting ceramic coating launched by Morgan
An innovative silicon nitride coating for ceramic components is now available from Morgan Advanced Materials, across a variety of its oxide and non-oxide ceramic materials.
Haldenwanger® HalCoat™ comprises two grades of Si3N4 coating which can be applied to a variety of Morgan products, including fused silica, silicon carbide and mullite bonded ceramics to offer a host of benefits from enhancing durability to avoiding contamination within a crucible.
Designed for fused silica rollers in applications such as hot stamping roller kilns, the standard purity of the first HalCoat™ grade helps prevent alloy build-up in the annealing process. The coating’s anti-wetting properties can extend the longevity of silica rollers, which are typically subject to layers of AlSi12 alloy forming on the surface.
The second HalCoat™ grade has been developed for the coating of fused silica crucibles, as Michael Rozumek, R&D Director for the Haldenwanger® products business at Morgan Advanced Materials, explains:
The latest advances in crucible technology utilise electro-magnetic fields to fine-tune the flow characteristics of melting silicon, which is invaluable in controlling the directional solidification of multi-crystalline photovoltaic silicon ingots. However, a knock-on effect is the considerable increase in mechanical wear within the crucible. Using HalCoat™ to treat these surfaces helps avoid delamination of the coating and therefore decreases the risk of contamination in the melt.
More information is available from: http://www.morganthermalceramics.com/products/kiln-furniture
Anomet Platinum-Clad Tantalum Wire designed for implantable medical devices
Anomet Products custom manufactures a special clad composite wire that is biocompatible, strong and corrosion-resistant for use in fabricating implantable medical devices.
Anomet Platinum-Clad Tantalum Wire combines the properties of each alloy to provide a biocompatible, high-strength and corrosion resistant radiopaque wire for use in short-term and long-term implantable medical devices. Suitable for coils, electrodes, leads and sensors, this conductive wire can be made in sizes from 0.002″ to 0.125″ (0.05 to 3 mm) O.D. with 2 per cent typical cladding thickness.
Providing greater ductility and formability than filled or plated wire, Anomet Platinum-Clad Tantalum Wire is suitable for use in deep-brain neuro-stimulators, Cochlear implants, gastric stimulators, insulin pumps, cardiac defibrillators and pacemakers. Platinum-Iridium Clad Tantalum and other clad wire material combinations and different cladding layers are offered.
Anomet Platinum-Clad Tantalum Wire is priced according to configuration and quantity. Samples and pricing are available upon request.
Anomet Products is well-known as the leader in innovative composite metal products. Founded in 1976, Anomet specializes in the manufacture of custom clad metal composites featuring a true metallurgical bond. The company has been dedicated to developing new products using advanced metallurgical technology resulting in long-lasting, high-reliability, cost-effective materials. Given that material costs today represent 90 per cent of the overall cost of products, Anomet engineers are experts at cost reduction while improving the material properties and quality.
Producing clad wire, rod, bars, ribbon and plates, Anomet Products can offer a wide range of metal alloy compositions available with virtually any ratio or thickness. Major industries served include aerospace, automotive, appliance, defense, corrosion protection, electronic, electrochemical, industrial, medical and oil and gas industries. Each year, Anomet reinvests a considerable amount of its resources in R&D to stay on the leading edge in the industries it serves.
More information is available from: http://www.anometproducts.com
Research findings point way to designing crack-resistant metals
Potential solutions to big problems continue to arise from research that is revealing how materials behave at the smallest scales.
The results of a new study to understand the interactions of various metal alloys at the nanometer and atomic scales are likely to aid advances in methods of preventing the failure of systems critical to public and industrial infrastructure.
Research led by Arizona State University materials science and engineering professor Karl Sieradzki is uncovering new knowledge about the causes of stress-corrosion cracking in alloys used in pipelines for transporting water, natural gas and fossil fuels – as well as for components used in nuclear power generating stations and the framework of aircraft.
Sieradzki is on the faculty of the School for Engineering of Matter, Transport and Energy, one of ASU’s Ira A. Fulton Schools of Engineering.
His research team’s findings are detailed in an advance online publication on June 22 of the paper “Potential-dependent dynamic fracture of nanoporous gold” on the website of the journal Nature Materials.
Using advanced tools for ultra-high-speed photography and digital image correlation, the team has been able to closely observe the events triggering the origination of stress-corrosion fracture in a model silver-gold alloy and to track the speed at which cracking occurs.
They measured cracks moving at speeds of 200 m per second corresponding to about half of the shear wave sound velocity in the material.
This is a remarkable result, Sieradzki said, given that typically only brittle materials such as glass will fracture in this manner and that gold alloys are among the most malleable metals.
In the absence of a corrosive environment, these gold alloys fail in the same manner as children’s modeling clay, Sieradzki explained: roll modeling clay into a cylindrical shape and you can stretch it by a by 100 per cent before it slowly tears apart. In the presence of corrosive environments, silver is selectively dissolved from the alloy causing porosity to form (see photo). If this occurs while the alloy is stressed, then the material fails as if it were made of glass.
These results provide a deeper understanding of the stress-corrosion behavior of metals such as aluminum alloys, brass and stainless steel that threatens the mechanical integrity of important engineered components and structures.
The team’s discoveries could provide a guide for “designing alloys with different microstructures so that the materials are resistant to this type of cracking”, Sieradzki said.
More information is available from: Nature Materials (2015) doi: http://10.1038/nmat4335
New Form Talysurf i-Series combines high-accuracy surface measurement with cost-effective performance
The new Form Talysurf i-Series precision surface measurement tool from Taylor Hobson, a global leader in ultra-precision measurement instruments, offers such features as industry-leading precision gauges and datums, simultaneous surface finish and contour measurement and a full suite of roughness and waviness parameters.
The new Talysurf i-Series is ideal for the shop floor environment and provides excellent value for the money. The versatile instrument combines Taylor Hobson’s decades of experience in high-accuracy surface measurement with its expertise in ultraprecision machining. It relies on a low-noise metrology frame (<8 nm), a high-precision manufactured datum and software datum correction to guarantee accurate and repeatable results and a best-in-class straightness specification of less than 0.15 μm.
The Talysurf’s high-resolution gauge measures curved or flat surfaces for contour and surface finish. I-Series’ measurement analysis package includes least squared line, arc and polynomial form removal plus the most up-to-date filtering techniques. These include but are not limited to spline and robust Gaussian filters and a complete set of parameter definitions set to the latest international standards.
New Quick Start Technology (QST) aids in improving measurement speed and set-up time. QST technology aids the quick spot check of parts and ensures ease of use for any operator, helping to reduce training time and cycle time. The new i-Series also allows operators to save interrupted measurements.
The new Talysurf i-Series comes with Taylor Hobson’s Dual Profile Analysis, a powerful utility that allows the analysis of two consecutive profiles and can be used to demonstrate not only instrument repeatability but also the integrity of the measurement taken.
Optional Q-Link software allows for simple use and automatic summary reports and is fully accredited by Q-DAS. Q-Link is built to automatically create Q-DAS file formats, which automatically import such details as part number, serial number, line number, batch number, operator, etc.
Q-Link also can be equipped to work seamlessly with any barcode scanner, allowing an operator to simply scan a part and have the part program begin in a fully automatic fashion. Q-Link also has the ability to report results in a simple CSV format for compatibility with other SPC packages. By permitting automated operation and part traceability, Q-Link is a powerful tool for practically any work environment.
Taylor Hobson is a leading manufacturer of ultra-precision measurement instruments for a variety of markets, including optics, semiconductors, hard disk drives and nanotechnology research. It is a unit of Ametek, Inc, a leading global manufacturer of electronic instruments and electromechanical devices, with 2014 annual sales of $4.0 billion (Figure 1).
Figure 1 - Talysurf i-series surface measurement tool
More information is available from: http://www.taylor-hobson.com