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Zhurnal Tekhnicheskoi Fiziki, 2025 Volume 95, Issue 2, Pages 221–231 (Mi jtf7187)

Special issue on the materials of the International Conference "Nanocarbon and Diamond" (NiA'2024)
Physical science of materials

Postgrowth regime optimization of temperature and pressure reduction in HPHT diamond crystal growth method

A. P. Broykoa, N. I. Alekseevab, I. V. Klepikovc, A. V. Koliadinc, I. V. Oreshkoab, A. V. Solomnikovaa

a Saint Petersburg Electrotechnical University "LETI", St. Petersburg, Russia
b Ioffe Institute, St. Petersburg, Russia
c Almaz Scientific and Production Complex

Abstract: Along with exceptional strength characteristics, typical of the diamond is significant brittleness. In particular, an appreciable fraction of diamonds grown using HPHT technology, crack when the rigid P-T conditions inherent to the crystal growth process are gradually reduced. The cause of cracking is excessive stresses associated with the deficiency of plastic properties of the diamond growth medium at certain stages of P-T reduction. A significant contribution to the crystal cracking probability can also be made by the insulating container which encorporates the growth medium and a part of the heating circuit. The paper considers the possibilities of minimizing the mechanical stress in the growth cell and, consequently, in the diamond by choosing the optimal trajectory of the pressure and temperature reduction.

Keywords: high volume cubic press, diamond cracking, ductility of cast iron, ductility of solid catalyst.

Received: 27.09.2024
Revised: 27.09.2024
Accepted: 27.09.2024

DOI: 10.61011/JTF.2025.02.59712.278-24



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© Steklov Math. Inst. of RAS, 2025