Single crystal diamond, method for producing single crystal diamond, and tool using single crystal diamond
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Solution Overview
Problem
Conventional single crystal diamond tools face challenges in achieving a balanced improvement in hardness and chipping resistance, with high hardness leading to insufficient fracture toughness and chipping resistance.
Innovation Solution
The introduction of specific ranges of total nitrogen atoms and isolated substitutional nitrogen atoms into single crystal diamond, achieved through controlled chemical vapor deposition and annealing treatments, enhances both hardness and chipping resistance in a balanced manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the concentration of impurity nitrogen is lowered to improve wear resistance, then hardness increases, but fracture toughness decreases leading to insufficient chipping resistance
Solution Approach 1:
The invention changes the chemical composition parameters by precisely controlling the concentration of total nitrogen atoms (0.01-10 ppm) and isolated substitutional nitrogen atoms (0.001-1 ppm) in the diamond crystal lattice. This parameter optimization resolves the contradiction by finding the optimal balance point where wear resistance and chipping resistance are both maximized
Solution Approach 2:
The invention creates a composite nitrogen configuration within the diamond structure by combining specific amounts of isolated substitutional nitrogen atoms (which enhance hardness) with controlled total nitrogen content (which affects fracture toughness). This composite approach at the atomic level allows simultaneous optimization of both hardness and chipping resistance
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
This approach results in single crystal diamond tools with improved wear resistance and chipping resistance, maintaining high hardness while effectively suppressing crack propagation.
Implementation Method 1
a method for manufacturing the single crystal diamond with chemical vapor deposition
Implementation Method 2
achieved through controlled chemical vapor deposition and annealing treatments
Data Source
AI summary
Single crystal diamond of which hardness and chipping resistance have been improved in a balanced manner, a method for manufacturing the single crystal diamond, and a tool containing the diamond are provided. Single crystal diamond contains nitrogen atoms, and a ratio of the number of isolated substitutional nitrogen atoms in the single crystal diamond to the total number of nitrogen atoms in the single crystal diamond is not lower than 0.02% and lower than 40%.