The physics of ceramic graphene composites. Ceramics are more resistant to cracks when graphene is added according to recent physics research.

“Peter the Great St. Petersburg Polytechnic University (SPbPU) physicists and materials researchers studied the structures in nanomaterials made of ceramic and graphene plates in which cracks occur most frequently.
 
The Mechanics of Materials Journal released the outcomes of the model’s first trial, which explains this regularity. This model will assist to create products that are crack-resistant. The Russian Science Foundation grant endorsed the study.
 
Graphene is the composite of carbon that is lightest and strongest. In addition, the electrical conductivity is very large. Graphene is often included in the structure of fresh ceramic-based products because of these features.
 
Ceramics are resistant to elevated temperatures and the composites become multifunctional when carbon changes are added. Flexible electronic devices, sensors, construction, and aerospace can be used in the future.”
 
From many experimental studies of such composites, it is known that the graphene proportion in the composition and the size of graphene plates assigned in the ceramic matrix set their mechanical characteristics. For example, high crack resistance was achieved with the help of long plates in the case of low graphene concentration.
 
The physicists assumed that crack formation in the composites was linked to the limits of so-called ceramic grains — microscopic crystals that shape the fabric. Graphene sheets can be situated both at ceramic grain boundaries and inside grains in the composites.
 
Using the model, the researchers calculated the critical values for three distinct composites of the stress intensity factor. It was found that the lower the critical value of the stress intensity factor, the closer the length of graphene plates to the length of grain boundary lines.”

 
Read full article In ceramic/graphene composites, physicists discover weak places

Source: Industry Global News

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