Mitsubishi Materials has been granted a patent for a surface coated cutting tool featuring a multi-layer hard coating. The coating includes titanium carbonitride, titanium nitride, titanium oxycarbonitride, and aluminum oxide layers, each with specified thicknesses and texture coefficients to enhance performance. GlobalData’s report on Mitsubishi Materials gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on Mitsubishi Materials, Ceramic membrane fuel cells was a key innovation area identified from patents. Mitsubishi Materials's grant share as of July 2024 was 39%. Grant share is based on the ratio of number of grants to total number of patents.
Surface coated cutting tool with multiple hard coating layers
The granted patent US12064817B2 describes a cutting tool featuring a multi-layered hard coating designed to enhance its performance and durability. The tool consists of a substrate coated with several layers, each serving a specific function. The inner layer is made of titanium carbonitride, with a thickness ranging from 4.0 to 20.0 µm, providing a robust foundation. This is followed by a lower intermediate layer of titanium nitride (0.1 to 2.0 µm) and an upper intermediate layer of titanium carbonitride (0.1 to 2.5 µm). Notably, the grain boundaries of titanium nitride and titanium carbonitride in these layers are continuous with those in the inner layer, promoting structural integrity. Additionally, a bonding auxiliary layer of titanium oxycarbonitride (3 to 80 nm) and an outer layer of a-aluminum oxide (2.0 to 20.0 µm) complete the coating structure.
The patent further specifies the texture coefficients of the materials used, which are critical for the tool's performance. The texture coefficient TC(422) for titanium carbonitride in both the inner and upper intermediate layers is set at 3.0 or more, indicating a preferred crystallographic orientation that can enhance wear resistance. Meanwhile, the outer layer of a-aluminum oxide has a texture coefficient TC(0 0 12) of 5.0 or more, suggesting a high degree of crystallinity that contributes to the tool's overall effectiveness. This innovative multi-layered coating approach aims to improve the cutting tool's longevity and efficiency in various applications.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
