W-Ti Interlayer Coated Cutting Tool for Stable Wear Resistance
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Solution Overview
Problem
The durability of coated cutting tools for high-hardness steel machining is unstable due to variations in the composition of the interlayer coating film formed through Ti bombardment, affecting tool performance.
Innovation Solution
A coated cutting tool with an interlayer coating film composed mainly of W and Ti, forming a face-centered cubic lattice structure, and a hard coating film of AlCrSi-based nitrides or carbonitrides with specific atomic content ratios to enhance durability and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an interlayer coating film is formed through Ti bombardment, then adhesion between the substrate and hard coating film is improved, but the composition of the interlayer coating film varies widely, causing unstable tool performance
Solution Approach 1:
The patent applies parameter changes by precisely controlling the composition parameters of the interlayer coating film. Specifically, it sets the W content to 70-80 atomic % and Ti content to 20-30 atomic %, with strict upper limits for Al (≤5 atomic %) and Si (≤5 atomic %). These controlled parameter ranges ensure consistent face-centered cubic structure formation and stable tool performance across different machining conditions.
Solution Approach 2:
The patent uses composite materials by creating a multi-layer coating structure consisting of a substrate, an interlayer coating film with specific W-Ti composition, and a hard coating film of AlCrSi-based nitrides or carbonitrides. This composite structure combines the adhesion benefits of Ti bombardment with the wear resistance of the hard coating film, while the controlled composition prevents performance variability.
2Strength
If the Si content in AlCrSi nitrides or carbonitrides is increased to refine the coating film structure, then wear resistance is improved, but the composition control becomes more critical to maintain stable durability
Solution Approach 1:
The patent applies parameter changes by optimizing the Si content in the hard coating film to a specific range (4-15 atomic %). This controlled parameter change refines the coating film structure to improve wear resistance while maintaining manufacturing feasibility and composition stability, avoiding the pitfalls of excessive Si content that would require overly precise control.
3Adaptability or versatility
If the interlayer coating film composition is allowed to vary, then adaptability to different machining conditions may improve, but durability becomes unstable
Solution Approach 1:
The patent resolves this contradiction by establishing specific parameter ranges for the interlayer coating film composition (W: 70-80 atomic %, Ti: 20-30 atomic %) that provide both adaptability and stable durability. The face-centered cubic structure formed within these ranges ensures consistent performance across different machining conditions while maintaining reliable adhesion and coating integrity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a coated cutting tool with improved durability and stable tool performance by reducing composition variations in the interlayer coating film and refining the crystal structure, leading to enhanced wear and heat resistance.
Implementation Method 1
a composition of an interlayer coating film formed through Ti bombardment to a composition that is mainly composed of W and Ti... a crystal structure thereof becomes a face-centered cubic lattice structure
Implementation Method 2
a hard coating film made of AlCrSi-based nitrides or carbonitrides
Implementation Method 3
a hard coating film made of AlCrSi-based nitrides or carbonitrides
Implementation Method 4
an interlayer coating film formed through Ti bombardment
Data Source
AI summary
Provided is a coated cutting tool in which a surface of a substrate is coated with a hard coating film. The hard coating film includes: a layer (A) disposed on the surface of the substrate, and having a face-centered cubic lattice structure, in which the total content ratio of W and Ti is at least 85 atomic %, and which contains W as the most abundant element and Ti as the next most abundant element among metal (including metalloid) elements; and a layer (B) disposed on the layer (A) and having a face-centered cubic lattice structure, which is composed of nitrides or carbonitrides containing Al, Cr, and Si, and in which, among metal (including metalloid) elements, the Al content ratio is at least 50 atomic %, the total content ratio of Al and Cr is at least 85 atomic %, and the Si content ratio is 4 to 15 atomic %.