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Nanometer silicon carbide can be used in high strength ultra

2018-09-29 15:07 View:
Any new technology will go through the process of development to maturity, and nano-SiC SiC is no exception.
 
 
A research team at the University of California, Los Angeles, recently developed a new type of metal that is extremely strong but extremely lightweight. This new type of metal – precisely metal nanocomposites – is made of magnesium with nano-silicon carbide particles that can be used to make light aircraft, space probes, cars, etc. and help to improve these devices. Fuel efficiency. The results of the study were published in the journal Nature.
 
 
Magnesium is only two-thirds the density of aluminum and is the lightest structural metal. Silicon carbide is an ultra-hard ceramic that is used in industrial manufacturing for cutting edges. Scientists believe that nano-ceramic particles can increase their strength without destroying metal plasticity. However, due to the attraction characteristics of tiny particles, nano-ceramic particles tend to condense together after adding liquid metal, rather than being uniformly dispersed. . Previously no research team was able to successfully disperse ceramic nanoparticles in molten liquid metal.
 
Researchers at the School of Engineering and Applied Sciences at Henry Satyrley have found a new way to stably and evenly disperse nanoparticles in liquid metals. In order to make this new type of metal, researchers have dispersed nano-ceramic particles in a liquid magnesium-zinc alloy, allowing them to disperse on their own kinetic energy and avoid mutual agglomeration. They also use a high pressure torsion technique to further increase the strength of the metal. With this method, researchers uniformly added a large amount of silicon carbide particles smaller than 100 nanometers to magnesium, increasing the strength, stiffness, plasticity and heat resistance of magnesium.


The specific strength and specific modulus exhibited by this new type of metal have broken records. The so-called specific strength is the force per unit area when the material is broken, divided by its apparent density. The higher the specific strength, the lighter the material used to achieve the corresponding strength. The specific modulus, that is, the modulus of the material (the ratio of the stress to the strain of the material under stress) to the density, is an important indicator to measure the load carrying capacity of the material. By combining physics and material processing, the nanoparticles are uniformly and densely dispersed in the metal, paving the way for improving the performance of different metals so that they meet the energy and sustainability requirements of today's society. The new metal family has subversive attributes and functions, and the results of the study only reveal the veil of its potential value. silicon nitride
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