Abstract:
Amorphous carbon is obtained for the first time by quenching liquid carbon. The implementation of the laser melting of graphite flakes pressed onto a diamond substrate makes it possible to implement a scheme for a drop of liquid carbon to fall onto cold diamond. Diamond, due to its uniquely high thermal conductivity, ensures rapid cooling of the resulting melt. The quenching rate is one of the most important parameters affecting the formation and properties of amorphous materials. To calculate the real values of the quenching rate obtained in the experiment, a nonstationary one-dimensional heat conduction equation was solved taking into account the geometric dimensions of the experimental samples. The distribution of liquid carbon quenching rates is determined in the range $10^{14}$–$10^{12}$ K/s depending on the distance from the substrate. The research results showed that diamond can serve as a unique quenching medium for molten liquid carbon with an extremely high temperature of $5000$ to $6000$ K.
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