Multilayer Coating for Aluminum Die Casting Mold Thermal Resistance

The patent applies composite materials by creating a multilayer coating structure consisting of alternating TiAlN and Cr(SiC)N layers. Each layer has distinct properties: TiAlN provides hardness and wear resistance, while Cr(SiC)N provides oxidation resistance and thermal stability. The composite structure synergistically combines these properties to achieve both high thermal resistance and reliable high-temperature stability that neither material could provide alone.

The patent segments the coating into multiple thin layers (nano-multilayer structure) rather than using a single thick layer. This segmentation allows each layer to perform its specific function optimally and enables the coating to better manage thermal stress and prevent crack propagation, thereby improving both thermal resistance and high-temperature reliability.

The patent uses composite materials to simultaneously address abrasion resistance and sticking resistance. The TiAlN layers provide excellent abrasion resistance through their hard ceramic structure, while the Cr(SiC)N layers provide low surface energy and oxidation resistance that prevent molten alloy adhesion. This composite approach resolves the contradiction by assigning different functions to different layers.

The patent applies local quality by giving different layers different functional properties tailored to specific requirements. The TiAlN layers are optimized for mechanical strength and abrasion resistance, while the Cr(SiC)N layers are optimized for chemical stability and anti-sticking properties. Each layer performs its specialized function where needed, resolving the contradiction between abrasion and sticking resistance.

The patent segments the coating function into multiple layers, each optimized for specific requirements. This segmentation enables the coating system to provide heat resistance, sticking resistance, and durability simultaneously. The segmented structure is manufactured using sequential PVD deposition, which maintains manufacturing simplicity while achieving multi-functionality through functional division.

The patent uses composite materials to achieve multiple functions in a single coating system. By combining TiAlN and Cr(SiC)N in a multilayer structure, the coating simultaneously provides heat resistance from both materials, sticking resistance from Cr(SiC)N, and durability from the synergistic combination. This composite approach maintains ease of manufacture through standard PVD processes while achieving superior multi-functionality.