Composite Diamond Tool Stable Layer for Oxide Machining
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Solution Overview
Problem
Diamond tools are ineffective for machining oxides and iron due to wear issues caused by carbon's reactivity with oxygen and iron, and existing surface coatings have limitations such as high cost, layer peeling defects, and poor adhesion, making them unsuitable for precision machining and mirror-finish planarization.
Innovation Solution
A composite diamond body with a stable layer of metals like tungsten, tantalum, or carbides, deposited or ion-implanted on a high-quality diamond base material, which reduces reactivity with workpieces and enhances wear resistance and adhesion, allowing for mirror-finish planarization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sintered diamond or diamond sintered body is used as base material, then diamond tools can machine Al, Al alloy, Mg, and Mg alloy, but the surface is highly uneven and surface flatness is low due to binder inclusion and grain boundary gaps
Solution Approach 1:
The patent uses a composite structure combining diamond base material with a coating layer. The diamond base material provides machining capability while the coating layer (formed by physical vapor deposition) provides surface flatness and precision, resolving the contradiction between versatility and manufacturing precision.
Solution Approach 2:
The patent applies a coating layer specifically on the surface of the diamond base material. This local modification allows the bulk diamond material to maintain its machining capabilities while the coated surface achieves the required flatness and precision for mirror-finish planarization.
2Reliability
If a coating is formed on sintered diamond base material, then wear resistance is improved, but the surface flatness and end machining precision remain low
Solution Approach 1:
The patent creates a composite structure where the coating layer is specifically designed to provide both wear resistance and surface flatness. The multi-layer coating structure (nitride layer, composite wear-resistant layer, and AlN layer) ensures both protection and precision machining capability.
Solution Approach 2:
The patent controls the thickness parameters of each coating layer precisely (nitride layer: 7-15 μm, composite wear-resistant layer: 3-10 μm, AlN layer: 0.2-5 μm) to optimize both wear resistance and surface flatness, achieving end machining precision while maintaining reliability.
3Reliability
If a complicated multi-layer coating structure is formed, then wear resistance is improved, but cost increases and incidence of defects such as layer peeling increases
Solution Approach 1:
The patent uses a composite coating structure with three functional layers that work together to provide wear resistance. While the structure is multi-layered, each layer has a specific function that contributes to overall performance, making the complexity necessary rather than excessive.
Solution Approach 2:
The patent assigns specific functions to different layers: the nitride layer provides base adhesion, the composite wear-resistant layer provides primary wear protection, and the AlN layer provides surface quality. This functional differentiation optimizes wear resistance while managing complexity through clear division of labor.
4Reliability
If a coating is formed on diamond base material, then wear resistance against oxides and iron is improved, but adhesion to workpiece end is poor
Solution Approach 1:
The patent uses a composite coating structure where the nitride layer serves as an adhesion promoter between the diamond base material and the wear-resistant layers. This multi-functional composite structure simultaneously achieves wear resistance against oxides and iron and proper adhesion to the workpiece end.
Solution Approach 2:
The nitride layer acts as an intermediary between the diamond base material and the wear-resistant coating layers, ensuring proper adhesion. This intermediate layer facilitates bonding while allowing the outer layers to provide the necessary wear resistance for machining oxides and iron.
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 composite diamond body achieves high wear resistance and extended tool life, enabling effective machining of workpieces that cause diamond wear, including iron and oxides, with improved surface flatness and thermal conductivity.
Implementation Method 1
The coating is a physically vapor-deposited film
Implementation Method 2
at least one layer which is an ion-implanted layer disposed in the inner region from the surface of the diamond base material
Data Source
AI summary
A composite diamond body includes a diamond base material and a stable layer disposed on the diamond base material. The stable layer may have a thickness of 0.001 μm or more and less than 10 μm, and may include a plurality of layers. A composite diamond tool includes the composite diamond body. There are thus provided highly wear-resistant composite diamond body and composite diamond tool that are even applicable to mirror-finish planarization of a workpiece which reacts with diamond to cause the diamond to wear.