Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

First powder injection molding process for pure niobium

17.10.2005


Penn State researchers have developed the first powder injection molding process for pure niobium, a biocompatible material similar to platinum and titanium but cheaper.



The researchers, who are based in the University’s Center for Innovative Sintered Products, say the new process could open the door to injection-molded niobium parts ranging from rocket nozzles, to wires, to human bone replacements, to orthodontic braces.

Gaurav Aggarwal, doctoral candidate in engineering science and mechanics, will present the team’s work in a paper, Development of Niobium Powder Injection Molding, at the International Symposium on Tantalum and Niobium in Pattaya, Thailand, Oct. 17. His co-authors are Seong J. Park, research associate in engineering science and mechanics, and Dr. Ivi Smid, associate professor of engineering science and mechanics, who is Aggarwal’s thesis adviser.


Aggarwal notes that other researchers have developed techniques for processing niobium via powder metallurgy and some have applied powder injection molding to niobium-based alloys and superalloys. However, the Penn State team is the first to explore processing pure niobium via powder injection molding. They have developed a method to calculate the optimal proportions of niobium powder to binder in feedstocks as well as the appropriate temperature and duration for sintering.

The team’s method for calculating the optimal metal powder/binder proportions also can be applied to other materials which, like niobium, have irregularly-shaped particles.

Aggarwal points out that pure niobium products are currently formed from powders and, therefore, there is no powder cost penalty as in ferrous materials, for example. Although it is biocompatible and benign in use, niobium is difficult to control at the high temperatures needed to process it because of its high reactivity.

In the Penn State approach, powdered niobium is mixed with the appropriate binder in proportions roughly 92 percent niobium by weight and 8 percent binder by weight. The feedstock is then processed in a standard injection-molding machine.

The resulting part is placed in a solvent that dissolves out the binder and then is heated to drive off the solvent and any remaining binder. The part is then processed in a sintering furnace.

The researchers have validated their approach experimentally. The injection temperature and pressures were determined for optimal filling time based on simulation.

A’ndrea Elyse Messer | EurekAlert!
Further information:
http://www.psu.edu

More articles from Health and Medicine:

nachricht Penn vet research identifies new target for taming Ebola
12.01.2017 | University of Pennsylvania

nachricht The strange double life of Dab2
10.01.2017 | University of Miami Miller School of Medicine

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

Im Focus: How to inflate a hardened concrete shell with a weight of 80 t

At TU Wien, an alternative for resource intensive formwork for the construction of concrete domes was developed. It is now used in a test dome for the Austrian Federal Railways Infrastructure (ÖBB Infrastruktur).

Concrete shells are efficient structures, but not very resource efficient. The formwork for the construction of concrete domes alone requires a high amount of...

Im Focus: Bacterial Pac Man molecule snaps at sugar

Many pathogens use certain sugar compounds from their host to help conceal themselves against the immune system. Scientists at the University of Bonn have now, in cooperation with researchers at the University of York in the United Kingdom, analyzed the dynamics of a bacterial molecule that is involved in this process. They demonstrate that the protein grabs onto the sugar molecule with a Pac Man-like chewing motion and holds it until it can be used. Their results could help design therapeutics that could make the protein poorer at grabbing and holding and hence compromise the pathogen in the host. The study has now been published in “Biophysical Journal”.

The cells of the mouth, nose and intestinal mucosa produce large quantities of a chemical called sialic acid. Many bacteria possess a special transport system...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

Nothing will happen without batteries making it happen!

05.01.2017 | Event News

 
Latest News

Water - as the underlying driver of the Earth’s carbon cycle

17.01.2017 | Earth Sciences

Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

17.01.2017 | Materials Sciences

Smart homes will “LISTEN” to your voice

17.01.2017 | Architecture and Construction

VideoLinks
B2B-VideoLinks
More VideoLinks >>>