METHOD OF DETERMINING THERMAL CONDUCTIVITY OF DIAMOND MATERIALS Russian patent published in 2020 - IPC G01N25/18 

FIELD: measurement.

SUBSTANCE: invention relates to the field of thermophysical measurements and can be used to determine thermal characteristics of diamond materials, such as natural and synthetic monocrystals, diamond polycrystalline materials in the temperature range from 25 to 300 °C. Invention can be used to determine thermal conductivity and heat conductivity of diamond materials prepared in plates with thickness from 0.3 to 1 mm, flat sizes from 5 to 25 mm using laser heat flux (method of "laser flash"). Method comprises applying on a plane-parallel surface of a diamond material sample emitting and absorbing laser radiation coating, irradiating on one side of the sample with a short laser pulse, fixing temperature change on the other side of the sample, which characterizes thermal diffusivity. Coat consisting of 15–50 atomic layers of graphene, produced by layer-by-layer epitaxial build-up of atomic layers of graphene, is applied on plane-parallel surfaces of sample of diamond material.

EFFECT: high accuracy of determining thermal conductivity of diamond material by increasing absorption and reflection of laser radiation energy, which are dependent on special properties of coating a sample of diamond material.

3 cl, 2 dwg