Hard Laminar Coating for Heat-Resistant Alloy Machining
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Solution Overview
Problem
Cutting tools with existing hard laminar coatings do not exhibit satisfactory properties in terms of welding resistance, wear resistance, and heat resistance when used to cut heat-resistant alloys like Inconel and titanium alloys or composite materials.
Innovation Solution
A hard laminar coating is developed by alternately laminating a first film of oxide or oxynitride of (Ti1-aBa) with a second film of TiB2, where the atomic ratio a ranges from 0.02 to 0.7, and the thickness of each film is between 0.1 μm and 5.0 μm, with a total thickness of 0.2 μm to 10.0 μm, and the number of layers ranging from 2 to 100, using a PVD process such as arc ion plating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a Ti-based hard laminar coating includes an oxide or nitride of boron (B) in one film and boron (B) in the other film, then wear resistance, heat resistance, welding resistance, and bonding strength are all improved
Solution Approach 1:
The coating is divided into multiple thin films (first film and second film) with different compositions (oxide/nitride of B and B respectively) that are alternately laminated. This segmentation allows each layer to contribute specific properties, resolving the contradiction by achieving comprehensive performance improvement through structured division rather than a single complex material
Solution Approach 2:
The invention uses composite material structure with two kinds of films having different compositions (oxide/nitride of B and B) alternately laminated. This composite approach enables the coating to simultaneously achieve wear resistance, heat resistance, welding resistance, and bonding strength by combining materials with complementary properties
2Strength
If film thickness is reduced and number of lamination is increased, then film hardness and wear resistance are improved, but manufacturing complexity increases
Solution Approach 1:
The coating structure is segmented into multiple thin films with alternating compositions. By dividing the coating into first and second films with different material compositions rather than simply increasing the number of identical layers, the invention achieves enhanced hardness and wear resistance through compositional differentiation, which simplifies the manufacturing process compared to purely numerical multiplication of layers
Solution Approach 2:
Different regions (first film and second film) of the coating have different local qualities with distinct compositions (oxide/nitride of B and B respectively). This local quality differentiation allows each layer to optimize specific properties, achieving overall superior hardness and wear resistance without requiring excessive numbers of identical thin layers
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 coating achieves satisfactory properties in wear resistance, heat resistance, welding resistance, and bonding strength, making it suitable for machining tools and other applications.
Implementation Method 1
using a PVD process such as arc ion plating
Implementation Method 2
using a PVD process such as arc ion plating
Data Source
AI summary
It is provided a hard laminar coating consisting of a plurality of films including two kinds of films in the form of a first film and a second film having respective different compositions and alternately laminated on a surface of a base structure, wherein the first film is an oxide or an oxynitride of (Ti1aBa), while the second film is TiB2.