Single Crystal Diamond Tool Wear Control
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Solution Overview
Problem
Single crystal diamonds produced by vapor phase synthesis methods used in tools tend to chip easily, leading to scratches on workpieces and uneven wear rates due to uncontrolled introduction of impurities and defects, which hinders tool performance.
Innovation Solution
A single crystal diamond with controlled impurity and defect distribution, characterized by a specific transmittance ratio across its surface, is used to suppress abrupt transmittance changes, ensuring improved tool performance by minimizing chipping and scratches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single crystal diamond is used as a tool material, then the tool exhibits high hardness and wear resistance, but the single crystal material tends to chip and cause scratches on workpiece material
Solution Approach 1:
The invention introduces impurities and defects at specific locations within the crystal structure to create localized stress relief zones. By controlling the spatial distribution of impurities and defects, the patent creates regions with different mechanical properties that prevent crack propagation while maintaining overall crystal hardness and wear resistance.
Solution Approach 2:
The invention changes the chemical and structural parameters of the crystal by introducing controlled impurities and defects. This modifies the local mechanical properties of the crystal, creating a gradient of hardness and toughness that prevents chipping while maintaining wear resistance. The parameter changes are achieved through controlled synthesis conditions.
2Reliability
If impurities and defects are introduced into the crystal to reduce chipping tendency, then crystal breakage is suppressed, but the crystal exhibits uneven wear rate due to uncontrolled distribution of impurities and defects
Solution Approach 1:
The invention employs feedback control during the synthesis process to monitor and adjust the distribution of impurities and defects. By measuring the actual distribution and comparing it with the target uniform distribution, the synthesis conditions are adjusted in real-time to achieve homogeneous impurity and defect distribution, ensuring uniform wear rate while maintaining chip resistance.
Solution Approach 2:
The invention precisely controls the parameters of impurity introduction and defect formation during synthesis. By adjusting temperature, pressure, and chemical composition parameters, the patent achieves a uniform distribution of impurities and defects throughout the crystal, which prevents localized uneven wear while maintaining overall wear resistance and chip resistance.
3Reliability
If natural diamond is used, then the tool exhibits high performance, but natural diamond exhibits large variations in quality and cannot be supplied in a constant amount
Solution Approach 1:
The invention changes the synthesis method from natural formation to controlled chemical vapor deposition with precise parameter control. By controlling temperature, pressure, gas composition, and flow rates during synthesis, the patent produces single crystal diamonds with consistent quality parameters and predictable supply quantities, eliminating the variability inherent in natural diamond while maintaining high tool performance.
Solution Approach 2:
The invention enables self-controlled synthesis of diamond crystals through automated chemical vapor deposition processes. The system automatically regulates synthesis conditions, monitors crystal growth, and ensures consistent quality without relying on natural diamond extraction and sorting, thereby achieving stable supply and constant quality.
4Productivity
If diamond is produced by the high pressure high temperature method, then the diamond can be supplied in a constant amount with less quality variations, but the cost for manufacturing facilities is high
Solution Approach 1:
The invention replaces the high-pressure high-temperature mechanical synthesis system with a chemical vapor deposition system operating at atmospheric or near-atmospheric pressure. This substitution eliminates the need for expensive high-pressure equipment while achieving controlled diamond crystal growth through chemical reactions in a vapor phase, thereby reducing manufacturing facility costs while maintaining supply stability and quality consistency.
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 controlled introduction of impurities and defects in the single crystal diamond results in a tool that reduces scratches on workpieces and enhances tool performance by maintaining consistent wear rates, leading to improved durability and efficiency.
Implementation Method 1
a measurement region is defined in the surface, the measurement region includes a portion exhibiting a transmittance that is highest in the single crystal diamond and a portion exhibiting a transmittance that is lowest in the single crystal diamond
Data Source
Figure 1~2
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AI summary
A single crystal diamond (10) has a surface (10a). In the single crystal diamond (10), a measurement region (20) is defined in the surface (20a), the measurement region (20) includes a portion exhibiting a transmittance that is highest in the single crystal diamond (10) and a portion exhibiting a transmittance that is lowest in the single crystal diamond (10), the measurement region (20) has a plurality of square regions (20a) that are continuously arranged and each have a side having a length of 0.2 mm, and an average value of transmittances in each of the plurality of square regions (20a) is measured, wherein assuming that the average value of the transmittances in one square region (20a) is defined as T1 and the average value of the transmittances in another square region (20a) adjacent to the one square region (20a) is defined as T2, a relation of ((T1 - T2)/((T1 + T2) /2) x 100)/0.2 ≤ 20 (%/mm) is satisfied throughout the measurement region (20).