Intrinsic Interface Stability as a Structural Admissibility Condition for Heterogeneous Material Systems

Description (Abstract) This work establishes intrinsic interface stability across heterogeneous material systems as a necessary structural admissibility condition for materials claiming durable functionality, integration, or industrial deployability. The analysis is non-constructive and does not disclose any specific compositions, interface treatments, interlayers, bonding methods, or fabrication processes. Instead, it formalizes a boundary condition under which a claimed material system must possess interface stability as an identity-level property rather than as a consequence of sacrificial mediation, continuous reconditioning, or procedural maintenance. The framework constrains patentability at the level of enablement, inventive step, and industrial applicability, and applies uniformly across materials domains. This document functions as prior art defining admissibility, not as a technical teaching.