Alternating TiAlBN Hard Layer for Cutting Tool Heat and Breakage Resistance
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Solution Overview
Problem
Cutting tools experience reduced lifespan due to increased speed and efficiency in cutting processes, leading to higher loads and shorter tool life, necessitating improved mechanical characteristics such as wear resistance, breakage resistance, and heat resistance.
Innovation Solution
A cutting tool with a hard layer composed of alternately layered first and second unit layers, where the first unit layer is TiaAlbBcN and the second unit layer is TidAleBfN, with specific atomic ratios and thicknesses, enhancing breakage and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cutting processes are performed at higher speed and efficiency, then productivity increases, but tool life decreases due to increased loads
Solution Approach 1:
The coating film is divided into multiple alternating layers with different compositions (TiAlBN and TiAlBaN layers), each providing different functional properties. This segmentation allows the coating to simultaneously achieve high hardness for wear resistance and controlled brittleness for stress management, enabling higher cutting speeds while extending tool life
Solution Approach 2:
The invention uses composite coating materials containing titanium, aluminum, boron, and nitrogen in specific ratios. The multi-layer composite structure combines materials with different mechanical properties to achieve both high productivity and extended tool life by distributing stresses and preventing catastrophic failure
2Strength
If the coating film is made harder to improve wear resistance, then wear resistance increases, but breakage resistance decreases due to increased brittleness
Solution Approach 1:
The coating is segmented into alternating hard layers (TiAlBN) and slightly softer layers (TiAlBaN), where the hard layers provide wear resistance and the softer layers provide stress relief. This segmentation prevents crack propagation while maintaining surface hardness, resolving the contradiction between wear resistance and breakage resistance
Solution Approach 2:
Different regions of the coating have different compositions and properties. The TiAlBN layers provide high hardness and wear resistance, while the TiAlBaN layers provide ductility and stress management. This local differentiation allows the coating to exhibit both wear resistance and breakage resistance simultaneously
Data Source
AI summary
A cutting tool includes a substrate and a hard layer, whereinthe hard layer includes a first unit layer and a second unit layer being alternately layered in the hard layer,a thickness of the first unit layer is 2 to 100 nm,a thickness of the second unit layer is 2 to 100 nm,the first unit layer is composed of TiaAlbBcN,the second unit layer is composed TidAleBfN,an atomic ratio a satisfy 0.25≤a<0.45,an atomic ratio b satisfy 0.55≤b<0.75,an atomic ratio c satisfy 0<c≤0.1,a total of the atomic ratios a, b and c is 1,an atomic ratio d satisfy 0.35≤d<0.55,an atomic ratio e satisfy 0.45≤e<0.65,an atomic ratio f satisfy 0<f≤0.1,a total of the atomic ratios d, e and f is 1,the atomic ratios a and d satisfy 0.05≤d−a≤0.2, andthe atomic ratios b and e satisfy 0.05≤b−e≤0.2.