Polycrystalline Diamond Anvils for Ultra-High Pressure X-Ray Analysis
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Solution Overview
Problem
Existing high-pressure/high-temperature anvil configurations, such as those made of tungsten carbide and single-crystal diamond, face limitations in durability and x-ray transparency, leading to plastic deformation and catastrophic failure at high pressures, and insufficient support for single-crystal diamond anvils.
Innovation Solution
Development of polycrystalline diamond (PCD) anvils with enhanced diamond-to-diamond bonding and low metal-solvent catalyst concentration, allowing for higher coercivity and specific magnetic saturation, enabling the use of PCD in ultra-high pressure apparatuses that provide sufficient x-ray transparency for analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If tungsten carbide is used for anvil configuration, then the anvil can be manufactured with standard materials, but the anvil undergoes plastic deformation and catastrophic failure at pressures over 10 GPa
Solution Approach 1:
The patent employs a composite structure combining single-crystal diamond anvils with polycrystalline diamond seats. The single-crystal diamond provides exceptional hardness and pressure resistance, while the polycrystalline diamond seat provides structural support and distributes stress. This composite configuration resolves the contradiction by using materials with complementary properties to achieve both manufacturability and high-pressure durability.
Solution Approach 2:
The patent changes the material parameters by transitioning from conventional tungsten carbide to diamond-based materials. Specifically, it uses single-crystal diamond for the anvil portion and polycrystalline diamond for the seat, fundamentally altering the material composition to achieve superior mechanical properties at high pressures while maintaining manufacturability through established diamond synthesis techniques.
2Stress or pressure
If single-crystal diamond is used for anvil, then the anvil can operate at significantly higher pressures, but the anvil tends to cleave along certain crystal planes and requires mounting in tungsten carbide seat that cannot provide sufficient support
Solution Approach 1:
The patent creates a composite system where single-crystal diamond anvils are mounted in polycrystalline diamond seats. This composite configuration allows the single-crystal diamond to operate at high pressures while the polycrystalline diamond seat provides the necessary structural support and stress distribution, eliminating the need for tungsten carbide seats that cannot provide sufficient support.
Solution Approach 2:
The patent changes the supporting material parameter from tungsten carbide to polycrystalline diamond. This parameter change enables the support structure to match the high-pressure operational requirements, providing sufficient mechanical support and preventing cleavage failures while maintaining the high-pressure capability of the single-crystal diamond anvil.
3Productivity
If metal-solvent catalyst is present in PCD, then diamond nucleation and growth are promoted at higher sintering pressures, but the metal-solvent catalyst concentration affects x-ray transparency
Solution Approach 1:
The patent optimizes the metal-solvent catalyst concentration parameter in the PCD seat material. By controlling the catalyst content to specific ranges, the patent achieves sufficient diamond nucleation and growth during sintering while maintaining adequate x-ray transparency for analytical purposes, resolving the contradiction between sintering efficiency and x-ray transparency.
Solution Approach 2:
The patent applies different metal-solvent catalyst concentrations to different regions or aspects of the PCD structure. The catalyst concentration is optimized locally to promote diamond formation where needed while maintaining lower overall catalyst content in regions where x-ray transparency is critical, allowing simultaneous achievement of sintering efficiency and analytical accessibility.
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 PCD anvils enable the application of enhanced pressure while maintaining low metal-solvent catalyst content, ensuring thermal stability and sufficient x-ray transparency for high-pressure studies, such as x-ray diffraction, by promoting diamond nucleation and growth at higher sintering pressures, thus overcoming the limitations of existing anvil materials.
Implementation Method 1
a PCD anvil includes an anvil body comprising PCD exhibiting enhanced diamond-to-diamond bonding
Implementation Method 2
promoting diamond nucleation and growth at higher sintering pressures
Implementation Method 3
employing ultra-high pressures during sintering of the diamond particles
Implementation Method 4
provide sufficient x-ray transparency for studying and analyzing the sample with x-rays, such as through x-ray diffraction
Implementation Method 5
studying and analyzing the sample with x-rays, such as through x-ray diffraction
Data Source
AI summary
Polycrystalline diamond (“PCD”) anvils and associated ultra-high pressure apparatuses employing such anvils. The PCD anvils include an anvil body defining an anvil face. The anvil body comprises a plurality of diamond grains defining a plurality of interstitial regions, with a metal-solvent catalyst occupying at least a portion of the plurality of interstitial regions. The plurality and diamond grains and the metal-solvent catalyst of the PCD collectively exhibit a coercivity of about 115 Oe or more and a specific magnetic saturation of about 15 G·cm3/g or less.