Process for measuring an adhesion energy, and associated substrates
First Claim
1. A process for measuring an energy of adhesion between two bonded substrates which comprises:
- providing a test layer on a first substrate, wherein the test layer has an exposed surface;
providing a plurality of elementary test cells within the test layer for locally applying a preset mechanical stress (σ
) dependent on a temperature (T);
bonding a second substrate to the exposed surface of the test layer to form a bonding interface; and
increasing the temperature (T) of the bonded substrates to up to a test temperature (Tt), wherein the plurality of elementary test cells apply a preset transverse tensile stress to the bond interface so as to deduce the adhesion energy.
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Accused Products
Abstract
The invention relates to a structure and a process for measuring an energy of adhesion between two substrates bonded in a transverse direction. The method involves providing for at least one of the two substrates to have a plurality of elementary test cells within a test layer each being capable of locally applying, in the transverse direction, a preset mechanical stress (σ), dependent on the temperature (T), to a bond interface between the substrates in a direction tending to separate them, applying a test temperature to the substrates and identifying debonded regions of the bond interface so that the local adhesion energy at the test temperature in the regions may be deduced therefrom, the local adhesion energy in a region of the bond interface being deduced from the stress applied by the test cells that caused debonding in the region.
55 Citations
19 Claims
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1. A process for measuring an energy of adhesion between two bonded substrates which comprises:
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providing a test layer on a first substrate, wherein the test layer has an exposed surface; providing a plurality of elementary test cells within the test layer for locally applying a preset mechanical stress (σ
) dependent on a temperature (T);bonding a second substrate to the exposed surface of the test layer to form a bonding interface; and increasing the temperature (T) of the bonded substrates to up to a test temperature (Tt), wherein the plurality of elementary test cells apply a preset transverse tensile stress to the bond interface so as to deduce the adhesion energy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A substrate capable of measuring an energy of adhesion between itself and another substrate at a bond interface comprising:
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a first substrate; a test layer formed on the first substrate, wherein the test layer has an exposed surface for bonding; a plurality of elementary test cells formed within the test layer for locally applying in a transverse direction, a preset mechanical stress (σ
) dependent on the temperature (T), to a bond interface located between the surface of the test layer and another substrate bonded thereto. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification