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Smart Coatings
Published in Vaibhav Sanjay Kathavate, Pravin Pralhad Deshpande, Smart Coatings, 2023
Vaibhav Sanjay Kathavate, Pravin Pralhad Deshpande
Ceramics are nonmetallic inorganic material processed at high temperatures. It possesses high hardness and strength, low ductility. Any ceramic could be comprised of both metal and nonmetal. However, the end product is nonmetallic in nature. An advent in ceramic engineering opened up new pathways to synthesize ceramics at micro- and nanoscale, thereby producing the ceramics/ceramet coatings or thin films. A nanoceramic is a material capable of producing these coatings in thin film form. Nanoceramic coatings are promising candidates, especially against high wear and temperature. Interestingly, the dielectric, piezoelectric, pyroelectric, ferromagnetic, and electromagnetic effects can be introduced in the coatings made of hard nanoceramics and are advantageous in coupled loading environments. The main difference between nanocomposite and nanoceramic is that nanoceramic is the sub-component of the nanocomposite. A nanocomposite comprises a nanoceramic- and nanopolymer-embedded metallic matrix, while nanoceramic is only a repeated geometry of metal and nonmetal atoms with a periodic arrangement [2]. An interesting feature of these nanoceramic coatings, which makes them suitable for bioimplant materials, is their high corrosion resistance even in the aggressive environment (ceramics being nonmetallic, generally do not corrode).
Strengthening behaviour of forged in-situ developed magnesium composites
Published in Canadian Metallurgical Quarterly, 2023
Harprabhjot Singh, Deepak Kumar, Nooruddin Ansari
It is possible to reinforce the Mg-matrix with ceramic particles using an in-situ reaction of Ceric ammonium nitrate (CAN) and molten Mg. The amount of precursor CAN significantly influence the type and size of particles. Analysis with the help of XRD, SEM, EDS and TEM confirms that these particles are micro and nano-ceramics. The developed MMnCs are press forged at 350°C to reduce porosity and improve mechanical properties. Following are the key understandings regarding mechanical properties and texture evaluation: Micro and nano-ceramic reinforcements led to an improvement in mechanical properties.The central region of the forged disk shows better compressive strength over peripheral material (the radial direction of the forged disk is taken as the compression axis).During the compression test, the tensile twinning phenomenon is dominant in the central region of the forged disks and reduces the work hardening tendency during the compression test. In contrast, the peripheral region of the forged disks shows the dominance of basal texture.Higher amount of RE element led to a decrease in the diffusion process and thus DRV and DRX, subsequently. In C31F, strain in the matrix is absent at locations of grain nucleation. The nucleated grains led to a decrease in dislocation density, thus increasing the tendency of work hardening.Analytically predicted yield strength is close to the experimental result only in the case of C61F_C. This is attributed to the least chance of further twinning.