Synthetic Single Crystal Diamond Nitrogen Aggregation Chipping Resistance
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Solution Overview
Problem
Synthetic diamond tools suffer from insufficient hardness and chipping resistance, leading to tool chipping during cutting operations.
Innovation Solution
A synthetic single crystal diamond is produced with nitrogen content, irradiated with an electron or particle beam to introduce energy, and heat-treated in a vacuum or inert gas atmosphere to form aggregated nitrogen atoms, enhancing hardness and chipping resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If type Ib synthetic diamond is used in tools, then constant quality and stable supply are achieved, but the cutting edge is likely to be worn or chipped off due to isolated substitutional nitrogen atoms
Solution Approach 1:
The patent changes the chemical composition parameter by controlling nitrogen atom aggregation state. Through specific heat treatment conditions (temperature, time, atmosphere), isolated substitutional nitrogen atoms are transformed into aggregated nitrogen atoms, changing the material's mechanical properties to achieve both quality consistency and chipping resistance
Solution Approach 2:
The patent utilizes phase transition of nitrogen atoms from isolated substitutional state to aggregated state through heat treatment. This phase change in impurity configuration transforms the diamond's mechanical properties, resolving the contradiction between reliability and strength
2Reliability
If type IIa synthetic diamond is used in tools, then almost no nitrogen impurities are present, but the cutting edge is likely to be chipped off since there are no impurities or crystal defects to inhibit crack progress
Solution Approach 1:
The patent converts the harmful effect of nitrogen atoms (which cause chipping in type IIa) into a beneficial effect by aggregating them. The aggregated nitrogen atoms act as crack arrestors, transforming from a harmful impurity to a beneficial feature that enhances chipping resistance while maintaining high purity
3Strength
If natural diamond is used in tools, then high mechanical strength is achieved due to aggregated nitrogen atoms, but the supply is not stable and quality varies greatly
Solution Approach 1:
The patent controls the aggregation state of nitrogen atoms through specific heat treatment parameters. By precisely controlling temperature, time, and atmosphere conditions, the diamond achieves stable aggregated nitrogen atom configuration, ensuring both high mechanical strength and supply stability like natural diamond but with synthetic reliability
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 resulting synthetic single crystal diamond exhibits high hardness and excellent chipping resistance, allowing tools to cut difficult-to-cut materials without chipping, with improved wear resistance and extended tool life.
Implementation Method 1
a second step of irradiating the diamond single crystal with one or both of an electron beam and a particle beam so as to apply an energy of 100 MGy or more and 1000 MGy or less to the diamond single crystal
Implementation Method 2
a third step of heat-treating the diamond single crystal obtained in the second step so as to obtain a synthetic single crystal diamond
Implementation Method 3
a step 3a of placing the diamond single crystal obtained in the second step in a vacuum atmosphere or an inert gas atmosphere
Data Source
AI summary
Provided is a synthetic single-crystal diamond containing nitrogen. In an X-ray absorption fine structure thereof, a ratio I405/I412 between an intensity I405 of a peak which appears at an energy of 405±1 eV and has a full width at ¾ maximum of 3 eV or more and an intensity I412 of a peak which appears at an energy of 412±2 eV is less than 1.5.