Researchers have developed a way to create ceramics using 3D printing that results in a strong material with little tendency to crack that can be fabricated into complex, curved and porous shapes.
Ceramic materials offer many appealing qualities, including high-temperature stability, environmental resistance, and high strength. But unlike polymers and some metals, ceramic particles don't fuse together when heated.
This image shows a ceramic spiral created by the additive manufacturing process. This material relates to a paper that appeared in the Jan. 1, 2016 issue of Science, published by AAAS. The paper, by Z.C. Eckel at HRL Laboratories in Malibu, CA, and colleagues was titled, "Additive manufacturing of polymer-derived ceramics."
Credit: HRL Laboratories, LLC
Thus, the few 3D printing techniques that have been developed for ceramics have slow production rates and involve additives that increase the material's tendency to crack.
Zak Eckel and colleagues were able to improve upon these processes by using silicon- and oxygen-based polymers that, upon polymerization, trap the UV light so that additives aren't needed for the UV curing steps.
Once the polymer is printed, the part is heated to a high temperature to burn off the oxygen atoms, thus forming a highly dense and strong silicon carbide product.
Using electron microscopy to analyze the end product, the researchers detected no porosity or surface cracks.
Further tests reveal that the ceramic material can withstand temperatures of 1,400⁰ Celsius (2552⁰ Fahrenheit) before experiencing cracking and shrinkage.
The authors note that these developments, which also create a more efficient ceramic-production process, hold important implications for numerous high-temperature applications, such as in hypersonic vehicles and jet engines.
Natasha Pinol | EurekAlert!
Nagoya University researchers break down plastic waste
29.05.2017 | Nagoya University
A new tool for discovering nanoporous materials
23.05.2017 | Ecole Polytechnique Fédérale de Lausanne
The world's highest gain high power laser amplifier - by many orders of magnitude - has been developed in research led at the University of Strathclyde.
The researchers demonstrated the feasibility of using plasma to amplify short laser pulses of picojoule-level energy up to 100 millijoules, which is a 'gain'...
Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.
Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....
Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.
The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....
An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
24.05.2017 | Event News
23.05.2017 | Event News
22.05.2017 | Event News
29.05.2017 | Earth Sciences
29.05.2017 | Life Sciences
29.05.2017 | Physics and Astronomy