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how can lab diamond quality be improved by controlling the growth process?
Release time：
2026-05-19
source：
To improve the quality of synthetic diamonds (especially their thermal stability), it is essential to strictly control the crystal growth rate
Reducing the generation of impurities and inclusions: During the synthesis of diamonds, due to the involvement of catalyst metals, if the growth rate is relatively fast, it will inevitably trap some inclusions such as bubbles or catalyst metals. By strictly controlling the growth rate, the impurity content can be effectively reduced, thereby controlling the size and quantity of inclusions within the crystal.
Lowering internal thermal stress: Inclusions (like bubbles) inside the crystal are incoherent with the diamond matrix, and their thermal expansion coefficients differ from the matrix
. Upon heating, these inclusions generate shear stress within the diamond. The magnitude of this stress is proportional to the concentration (quantity) and the cube of the radius of the inclusions. Controlling the growth rate to reduce inclusions can significantly lower this destructive internal stress.
Preventing plastic deformation and graphitization: When the internal stress generated by inclusions increases with rising temperatures and exceeds the yield limit of the diamond matrix, it will cause plastic deformation and even graphitization of the crystal, severely reducing the thermal stability of the diamond.
Therefore, only by strictly controlling the growth rate to reduce the number of inclusions and control their size can we prevent the generation of excessive internal stress during heating, thereby obtaining high-quality diamonds with high thermal stability.
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