METHOD FOR TESTING THE RESISTANCE OF DIELECTRIC MATERIALS TO THERMAL SHOCK Russian patent published in 2022 - IPC G01N3/60 

FIELD: materials testing.

SUBSTANCE: invention relates to methods for testing materials, in particular to methods for influencing a material with thermal shock. A method for testing the resistance of dielectric materials to thermal shock is claimed, which consists in the action of an electric discharge plasma on a dielectric material. A powerful current pulse of ~15 kA with a duration of ~100 ms, generated by an induction storage of electrical energy, is fed through an annular and axial current lead to a conductive diaphragm. The result is a current density gradient, which in turn leads to a temperature gradient on the surface of the sample, since thermal shock occurs when different parts of the sample expand by different amounts under the action of a temperature gradient. Thus, by changing the strength of the current, the parameters of thermal shock are changed. It has been experimentally established that a one-time short-term (70–100 ms) exposure to an electric discharge plasma (brightness temperature reached 4500 K) leads to a change in the sample surface. The criterion for the resistance of the sample to thermal shock is the degree of melting, delamination or its destruction. Depending on the material being tested (glass, ceramic glass, textolite, etc.), the degree of exposure is different.

EFFECT: to create the specified temperature gradients in the test sample and reduce the test time, it is exposed to electric discharge plasma.

1 cl, 1 dwg