Researchers have shown how to coat glass and plastic with porous titanium dioxide. The fabrication process is straightforward, the materials are cheap, and the ceramic’s gas sensing performance is considerably improved compared with current devices.

New Plasma Process for Surface Treatment of Implants

TBMG-3711806/01/2020

The medical device industry has long sought surface modification solutions that will improve cell growth and proliferation on titanium, polyetheretherketone (PEEK), and polymer artificial implants. In some cases, plasma sprays are applied. However, within the industry there is concern that small particles of the coating could be released into the surrounding tissue. Radiofrequency (RF) plasma is another alternative, but the process generates quite a bit of heat — a distinct disadvantage when processing polymer implants.

Tungsten Carbide-Cobalt Powder Agglomerated and Sintered

AMS7881B-TEST-REC (Historical)05/06/2020

This specification covers tungsten carbide-cobalt in the form of powder.

AMS F Corrosion Heat Resistant Alloys Committee

Tungsten Carbide-Cobalt Powder Agglomerated and Sintered

AMS7881B (Current)

05/06/2020

This specification covers tungsten carbide-cobalt in the form of powder.

AMS F Corrosion Heat Resistant Alloys Committee

Low-Cost Detection of Thin Film Stress During Fabrication

TBMG-3686805/01/2020

NASA’s Marshall Space Flight Center has developed a simple, cost-effective optical method for thin film stress measurements during growth and/or subsequent annealing processes. Stress arising in thin film fabrication presents production challenges for electronic devices, sensors, and optical coatings; it can lead to substrate distortion and deformation, impacting the performance of thin film products.

Tungsten Carbide-Cobalt Chrome Powder Agglomerated and Sintered

AMS7882C (Historical)

04/21/2020

This specification covers tungsten carbide-cobalt chrome in the form of powder.

AMS F Corrosion Heat Resistant Alloys Committee

Tungsten Carbide-Cobalt Chrome Powder Agglomerated and Sintered

AMS7882C-TEST-REC (Historical)04/21/2020

This specification covers tungsten carbide-cobalt chrome in the form of powder.

AMS F Corrosion Heat Resistant Alloys Committee

Development of a Novel Method to Simulate Cavity Preservation in Automotive Industry

2020-01-090004/14/2020

Corrosion protection is a major topic of research for automotive manufacturers and major suppliers. The most critical parts affected by corrosion are the pillars and cavities. Automotive manufacturers spend a lot of effort to improve protection layers as much as possible to increase the longevity of their products. The Electro-Coat Paint Operation (ELPO) or E-Coat process is key in achieving this goal. Unfortunately, often the electric current does not reach all the areas very well and resulting in undercoating. Also, the consequent baking process might see the ovens not achieving the desired temperatures into the cavities. As a fact it often happens that these areas are exposed by undercoating, and hence undermining the quality of corrosion protection. Some car manufacturers investigate one level more to assure a good quality of corrosion protection also within cavities, by applying wax. This wax coating process aims to cover all problematic areas in a way to make cavities more

Chitneedi, Bhargav Krishna, Schifko, Martin, Verma, Kevin, Menon, Muraleekrishnan, NAIR, Vishal

Spatially Optimized Diffusion Alloys: A Novel Multi-Layered Steel Material for Exhaust Applications

2020-01-105104/14/2020

A novel Spatially Optimized Diffusion Alloy (SODA) material has been developed and applied to exhaust systems, a very aggressive environment with high temperatures and loads, as well as excessive corrosion. Traditional stainless steels disperse chromium homogeneously throughout the material, with varying amounts ranging from 11% to 18% dependent upon its grade (e.g. 409, 436, 439, and 441). SODA steels, however, offer layered concentrations of chromium, enabling an increased amount along the outer surface for much needed corrosion resistance and aesthetics. This outer layer, approximately 70µm thick, exceeds 20% of chromium concentration locally, but is only 3% in bulk, offering selective placement of the chromium to minimize its overall usage. And, since this layer is metallurgically bonded, it cannot delaminate or separate from its core, enabling durable protection throughout manufacturing processes and full useful life. The core material may be of various grades, however, so this

Kotrba, Adam, Quan, Tony, Wei, Winston, Detweiler, Zachary, Keifer, David, Bullard, Daniel

Additive Manufacturing Method for Sub-Microscale Three-Dimensional Structures

TBMG-3637604/01/2020

NASA Goddard Space Flight Center has developed a substantial advancement in additive manufacturing technology. The method eliminates most material restrictions, enabling fabrication of sub-microscale three-dimensional structures composed of nearly any material that is compatible with chemical vapor deposition (CVD) including metallic and ceramic materials. Current technology for the production of microscale three-dimensional structures, such as two-photon lithography, is generally limited to the use of photosensitive polymeric materials.

Choose Surface Treatments Early to Avoid Future Problems

TBMG-3638504/01/2020

Too often, design engineers look at coating parts as an afterthought. Rather than being part of the discussion in the early stages of design, engineers sometimes try to solve problems with coatings during — or even after — manufacturing. While surface treatments such as anodizing, electroplating, and thermal spray provide their own unique set of properties and benefits, these processes also have limitations that demand attention early in the design process to ensure optimal performance.

Hardening Lightweight Metal Foams with Nanocoating

TBMG-3581801/01/2020

Bones are strong and stable and can cope with loads almost as well as steel. But despite their strength, they are light enough to be easily moved by humans and animals. The secret lies in the combination of a hard, exterior shell that encases a porous lattice-like network of bone tissue in the interior of the bone. This structure saves on material and reduces weight.

Experimental Study on Tool Wear and Cutting Temperature during Machining of Nimonic C-263 and Waspaloy Based on Taguchi Method and Response Surface Methodology

2019-28-014410/11/2019

Nickel based materials of Nimonic C-263 and Waspaloy are used nowadays for aerospace applications owing to its superior strength properties that are maintained at a higher temperature. Tool wear and cutting temperature in the vicinity of cutting edge are two essential machinability characteristics for any cutting tool. In this regard, this study is pursued to examine the influence of factors on measuring of tool wear (Vba) and cutting temperature (Ts) during dry machining of two alloys studied experimentally based on Taguchi method and response surface methodology. Taguchi’s L16 orthogonal array is used to design the experiment and a PVD (TiAlN), CVD (TiN/Al2O3/TiCN) coated carbide inserts are used on turning of two alloys. The factor effect on output responses are studied using analysis of variance, empirical models, and responses surface 3D plots. To minimize the response and to convert into one single optimum level, responses surface desirability function approach is applied. The

Kannan, Vetri Velmurugan, Kannan, Venkatesan, Sundararajan, Devendiran

Optimization of RF Magnetron Sputtering Parameters for Deposition of Zinc Oxide Semiconductor Film at Moderate Temperature of 100°C

2019-28-015010/11/2019

Zinc oxide semiconductor thin films are deposited on glass substrate at different RF magnetron sputtering parameters. The deposited films were characterized as a function of substrate - target distance, gas flow ratio, working pressure and RF power. X-ray diffraction, Field emission scanning electron microscopy, and hall measurement were utilized to analyze the effect of the deposition condition on the structure, surface morphology and electrical properties of ZnO thin films. The deposition conditions were optimized to give good quality films suitable for the application of flexible or invisible flat panel display. All the films were deposited at 100°C.

Muthukarappan, Amutha Surabi, Jeyaseelan, Chandradass, Paramathma, Baskara Sethupathi, Park, Seong-Ju

The Challenge of Replacing Hard Chrome

TBMG-3535910/01/2019

The Challenge of Replacing Hard Chrome

19AERP10_0310/01/2019

The search for a suitable replacement for hard chrome on aerospace components has been a key supply chain priority for aircraft manufacturers. This is because of the documented health risks to workers and the impact on the environment from exposure to hexavalent chromium, a carcinogen that occurs during the chrome plating process and is the most toxic form of chromium. As a result, chromium is a highly regulated chemical in major markets worldwide. In the European Union, hexavalent chromium falls under the domain of the EU regulation, REACH (Registration, Evaluation, Authorization and Restriction of Chemicals), which establishes guidelines for the safe use of chemicals throughout the supply chain. Chromium is also closely regulated in the United States by OSHA.

Designing Sensors for Hazardous Environments

TBMG-3519609/01/2019

Some of the most common applications for hazardous duty sensors are in the oil and gas industry. Rotary encoders are frequently used to provide crucial feedback about moving machinery on the rig. Flammable agents are common in applications near the wellbore, so most electrical components on the rig require special hazardous area certification. Hazardous duty sensors are also used in applications such as paint spray booths because of the volatiles coming off the paint; grain silos because the dust environment is very explosive; chemical factories; explosives factories; and believe it or not, for cosmetics because the very fine powders that are used are highly explosive.

Surface Treatment Could Improve Refrigeration Efficiency

TBMG-3513109/01/2019

Unlike water, liquid refrigerants and other fluids that have a low surface tension spread quickly into a sheet when they come into contact with a surface. For many industrial processes, it would be better if the fluids formed droplets that could roll or fall off the surface and carry heat away with them.

CONNECTOR RECEPTACLE, REVERSE BAYONET COUPLING, DUMMY STOWAGE

AS95234/12 (Current)08/27/2019

AE-8C1 Connectors Committee

Aerospace Work Platforms — More than Meets the Eye

TBMG-3454506/01/2019

For maintenance personnel in the aerospace industry to do their jobs effectively, they need to be able to get physically close to the equipment they are working on. This statement sounds obvious, but in order to meet this requirement, it is very important to utilize quality work platforms. Although most people are familiar with the basic uses of work platforms, there is not always much thought given to everything that goes into their design and fabrication.

Aerospace Work Platforms - More than Meets the Eye

19AERP06_1306/01/2019

Today's work platforms are far more complex than the simple designs of the past. For maintenance personnel in the aerospace industry to do their jobs effectively, they need to be able to get physically close to the equipment they are working on. This statement sounds obvious, but in order to meet this requirement, it is very important to utilize quality work platforms. Although most people are familiar with the basic uses of work platforms, there is not always much thought given to everything that goes into their design and fabrication. In years past, simple platforms were widely used for a variety of different work applications, however, much more is demanded of them in modern facilities. These increased demands have forced the work platform fabrication industry to evolve. The design and fabrication of today's platforms require manufacturers with expertise, experience, and skill. Fabricators and designers must incorporate specialized features in many areas never before seen or even

LED Lighting Improves Efficiency and Imaging

TBMG-3439705/01/2019

Rocket engine testing requires a lot of light since all tests are filmed with high-speed cameras to monitor performance; however, those cameras have to adjust to the bright plume from a firing engine, which would black out the rest of the image. Traditionally, that light has been provided by metal halide bulbs.

Experimental Study on Impingement of Fuel Droplet on Substrates

2019-01-0300

04/02/2019

Within a gasoline direct injection (GDI) engine, the impingement of fuel droplet on substrates induces various problems such as particular matter emission, oil dilution and abnormal combustion. Therefore, in order to solve these problems, it is urgent to have a clear understanding of the impingement behavior of fuel droplet impacting on substrates. Most previous studies have focused on the impingement of either water droplet on dry solid surface or the impinging droplet on the liquid film of the same type of liquid, while little research has been conducted on the impingement of fuel droplet on relevant substrates existing in GDI engines. The impingement of fuel droplet with higher Weber number on dry surface, fuel film and oil film with different thickness and viscosity were investigated experimentally. Results show that fuel droplet impacting on dry wall is easy to be deposited to form a fuel film. The fuel film attached to the wall is the main reason for the splash. The thickness of

Peng, Zhenshan, Pei, Yiqiang, Qin, Jing, Lu, Lili, Zhu, Qingyang

Fabric Alternative to Batteries for Wearable Devices

TBMG-3414804/01/2019

Wearable biosensors for health monitoring lack a lightweight, long-lasting power supply. A new method was developed for making a charge-storing system that is easily integrated into clothing for embroidering a charge-storing pattern onto any garment.

Scalable Manufacturing Process for Creating Spools of Graphene

TBMG-3369502/01/2019

For many researchers, graphene is ideal for use in filtration membranes. A single sheet of graphene resembles atomically thin chicken wire, and is composed of carbon atoms joined in a pattern that makes the material extremely tough and impervious to even the smallest atom: helium.

Optimizing Plasma Treatments to RESOLVE Challenging Adhesion Issues

TBMG-3342312/01/2018

The process of determining the ideal plasma treatment that will resolve a challenging bonding or adhesion issue is an exact science, often the domain of chemists and physicists.

Enhanced Contacts for Inverted Metamorphic Multi-Junction Solar Cells Using Carbon Nanotube Metal Matrix Composites

TBMG-3336812/01/2018

In order to address issues related to mechanical and vibrational stresses that are commonly experienced in mounting, launch, and deployment of spacecraft, metal matrix composite (MMC) electrodes were fabricated with carbon nanotubes (CNTs) as reinforcement. The research plans were centered on first developing and selecting appropriate processes for fabricating CNT-MMCs based on characterization of their material properties, followed by optimizing MMC designs based on electrical testing under stress. Efforts in the program were also directed toward implementing the CNT-MMCs into solar cell device processing in a process compatible with standard clean room procedures.

Does Your Coating System Require Climate Control? What to Look For and What to Expect

TBMG-3342212/01/2018

There is one aspect of the paint and coatings finishing business virtually guaranteed to give the budget director heart failure: climate control. There's no way around it – climate control systems are expensive.

Two-Dimensional Semiconductor Materials Created Using Artificial “Superlattices”

TBMG-3324111/01/2018

One current method to build a semiconductor superlattice — materials comprised of alternating layers of ultra-thin, two-dimensional sheets only one or a few atoms thick — is to manually stack ultrathin layers one on top of the other, but this is labor-intensive. In addition, since the flake-like sheets are fragile, it takes a long time to build because many sheets will break during the placement process. The other method is to grow one new layer on top of the other, using a process called chemical vapor deposition. But since that means different conditions such as heat, pressure, or chemical environments are needed to grow each layer, the process could result in altering or breaking the layer underneath. This method is also labor-intensive with low yield rates.

Increase Dental Implant Longevity with Bio-functional TiN and DLC Coatings

TBMG-3306410/01/2018

Artificial dental implants are the most reliable restoration option available for mature tooth loss. Despite their long potential lifespan, poor integration into the jaw and a slow healing process often create implant failure. Ensuring longevity requires adequate protection of the abutment-implant interface, protection achieved with surface functionalization by biocompatible coatings or advanced surface plasma treatments. The research summarized in this article examines the effect of using titanium nitride (TiN) and diamond-like carbon (DLC) thin-film coatings for implants.

Electric double layer capacitors prepared with polyvinyl alcohol and multi-walled carbon nanotubes

2018-36-031309/03/2018

Portable electronics, wearables, electric vehicles and solar cells are sectors in increasingly development which include innovation and miniaturization of the devices. In this scenario, the development of smaller and lightweight energy storage devices, which store more energy, is required. Besides, it is desirable for these devices to be environmentally friendly to minimize pollution. In an attempt to meet these requirements, this work purposes the development and the characterization of nanofibers-based electrode composed of Polyvinyl alcohol (PVA) and multi-walled carbon nanotubes (MWCNT) for electric double layer capacitors (ELCDs) devices with aqueous electrolyte. This composite has been prepared by electrospinning technique and consolidate an electrical conductive and high-surface material electrode. After that, the PVA/MWCNT electrode was assembled in coin cell device with Sodium Sulfate (Na2SO4) electrolyte for electrochemical characterization. The characterization results

Real, Carla Giselle Martins, Vicentini, Rafael, Nunes, Willian Gonçalves, Boas, Otávio Vilas, Costa, Lenon Henrique, Soares, Davi Marcelo, Zanin, Hudson

Q&A: Dr. André D. Taylor, Chemical & Biomolecular Engineering Dept., New York University Tandon School of Engineering, New York, NY

TBMG-3285609/01/2018

An international team of university researchers, led by Dr. Taylor, reports solving a major fabrication challenge for perovskite cells — the intriguing potential challengers to silicon-based solar cells. These crystalline structures show great promise because they can absorb almost all wavelengths of light. Perovskite solar cells are already commercialized on a small scale, but recent vast improvements in their power conversion efficiency are driving interest in using them as low-cost alternatives for solar panels.

Specifying Coatings for Military and Aerospace Applications

TBMG-3287609/01/2018

Optics are employed in virtually every area of military operations, from vision systems and target designators used by troops on the ground, through guidance systems utilized in both manned and unmanned aircraft, to reconnaissance and surveillance packages carried by satellites in Earth orbit. These optics are often subjected to large variations in ambient temperature and humidity, as well as contact with abrasive or corrosive materials (such as sand or salt spray). Thin film coatings, which are almost universally required on military optics, must be able to physically withstand these stressors, as well as deliver their design performance in an environment where “failure is not an option.” But, increasingly, achieving these ends must also be balanced with cost.

Coatings Make Natural Fabrics Waterproof

TBMG-3284509/01/2018

Fabrics that resist water are essential for everything from rainwear to military tents, but conventional water-repellent coatings have been shown to persist in the environment and accumulate in our bodies, and so are likely to be phased out for safety reasons. That leaves a big gap to be filled if safe substitutes can be found. The goal is for the materials to be repellent — for the drops to bounce back.

White Paper to Support Supersession of MIL-S-8879C With AS8879C

AIR5926 (Current)

08/23/2018

This paper was prepared to support supersession of MIL-S-8879C with Screw Thread Conformity Task Force selected industry standard AS8879C, published by the Society of Automotive Engineers (SAE). Other documentation changes will be covered by separate papers. Separate papers are anticipated for thread gaging issues, and thread gage calibration procedures. The STC-TF decided that the thread design standard needed to be completed before thread gage definition could be addressed. Thread gage definition has to be known before calibration procedures can be addressed.

E-25 General Standards for Aerospace and Propulsion Systems

Hardface Coating Systems for Wear and Corrosion Resistance

TBMG-3249608/01/2018

Metal alloys, such as titanium alloys and steels, are known to have a good combination of mechanical properties for many structural applications, but these metal alloys do not meet the wear and corrosion resistance requirements for some structural applications. Titanium alloys, for example, have many attractive properties such as high specific strength and stiffness, relatively low density, and excellent corrosion resistance, but have poor resistance to wear and oxidation at high temperatures. Conventional surfacing (such as nitriding), coating deposition (such as plasma spraying and sputtering), and plating have significant shortcomings that include potentially providing distorted substrates, deteriorated surfaces, and/or weak interfacial bonding.

Scientists Create Continuously Emitting Microlasers With Nanoparticle-Coated Beads

TBMG-3245208/01/2018

Researchers have found a way to convert nanoparticle-coated microscopic beads into lasers smaller than red blood cells. These microlasers, which convert infrared light into light at higher frequencies, are among the smallest continuously emitting lasers of their kind ever reported and can constantly and stably emit light for hours at a time, even when submerged in biological fluids such as blood serum.

Items per page:

1 – 50 of 498