Polycrystalline Diamond Compacts Using Eutectic Alloy Infiltrants
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Solution Overview
Problem
Conventional polycrystalline diamond compacts (PDCs) face challenges in achieving improved toughness, wear resistance, and thermal stability due to limitations in infiltration processes, particularly with high viscosity cobalt or nickel infiltrants, which can lead to incomplete bonding and delamination issues.
Innovation Solution
The use of a cobalt-based or nickel-based alloy infiltrant with a lower liquidus temperature and viscosity, combined with a second infiltrant that is easily removable, to enhance infiltration and bonding within the PCD table, improving wear resistance and thermal stability by forming an alloy with interstitially disposed components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If pure cobalt or nickel infiltrant is used, then bonding strength is improved, but viscosity is high leading to incomplete infiltration and delamination
Solution Approach 1:
The patent applies parameter changes by altering the temperature profile during infiltration. A two-stage temperature process is used: first heating to a lower temperature (e.g., 1200-1400°C) to melt the eutectic alloy infiltrant, then increasing to a higher temperature (e.g., 1500-1700°C) to ensure complete infiltration and bonding. This temperature parameter change enables the low-viscosity eutectic infiltrant to achieve both complete infiltration and strong bonding, resolving the contradiction between bonding strength and viscosity-related infiltration completeness.
Solution Approach 2:
The patent employs composite materials by using eutectic alloys (such as Ni-Si, Co-Si, Ni-B, Co-B) that combine multiple elements to achieve properties not present in pure metals. The eutectic composition provides lower melting temperature and lower viscosity compared to pure cobalt or nickel, while maintaining bonding strength. This composite approach allows the infiltrant to achieve both complete infiltration (due to lower viscosity) and strong bonding (due to eutectic composition), resolving the technical contradiction.
2Strength
If high viscosity cobalt or nickel infiltrant is used, then bonding strength is improved, but infiltration uniformity deteriorates
Solution Approach 1:
The patent uses parameter changes by implementing a two-stage temperature heating process. The first stage heats to a lower temperature to melt the eutectic alloy, which has lower viscosity and ensures uniform infiltration throughout the PCD table. The second stage increases temperature to optimize bonding strength. This staged temperature parameter change separates the infiltration and bonding processes, allowing uniform infiltration (at lower temperature with low-viscosity eutectic) and strong bonding (at higher temperature) to both occur, resolving the contradiction between bonding strength and infiltration uniformity.
Solution Approach 2:
The patent employs eutectic composite materials (Ni-Si, Co-Si, Ni-B, Co-B) that inherently have lower viscosity than pure cobalt or nickel at processing temperatures. This lower viscosity enables the infiltrant to flow uniformly throughout the porous structure of the PCD table, achieving complete and uniform infiltration. The eutectic composition maintains bonding strength through its unique phase properties, thus resolving the contradiction between bonding strength and infiltration uniformity.
3Strength
If pure cobalt or nickel infiltrant is used, then bonding strength is improved, but delamination resistance deteriorates
Solution Approach 1:
The patent applies parameter changes through a two-stage temperature process that first melts the eutectic alloy at lower temperature, allowing complete infiltration and strong bonding, then increases temperature to optimize bond strength. This temperature parameter change ensures that the eutectic infiltrant fully penetrates the PCD table structure and forms strong bonds throughout, preventing delamination while maintaining high bonding strength, thus resolving the contradiction between bonding strength and delamination resistance.
Solution Approach 2:
The patent uses eutectic composite materials (Ni-Si, Co-Si, Ni-B, Co-B) that provide both low viscosity for complete infiltration and high bonding strength through their unique phase diagrams. The eutectic composition creates a fine-grained microstructure in the bonded region that enhances both bonding strength and resistance to delamination. This composite material approach simultaneously achieves strong bonding and delamination resistance, resolving the technical contradiction.
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 more uniform infiltration, improved bonding between the PCD table and substrate, reducing delamination and enhancing the overall durability and performance of PDCs in mechanical applications.
Implementation Method 1
The first infiltrant has a lower liquidus temperature than a melting point of a respective one of a pure cobalt or pure nickel infiltrant. By decreasing the liquidus temperature of the alloy infiltrant, a viscosity of the alloy infiltrant may be lower as compared to a viscosity of pure cobalt or pure nickel at any given processing temperature and pressure. The lower viscosity may promote more uniform infiltration into the at least partially leached PCD table.
Implementation Method 2
The substrate(s) and volume(s) of diamond particles are then processed under HPHT conditions in the presence of a catalyst material that causes the diamond particles to bond to one another to form a matrix of bonded diamond grains defining a polycrystalline diamond ('PCD') table. Cobalt is often used as the catalyst material for promoting intergrowth of the diamond particles.
Implementation Method 3
Once the PCD table is formed, the solvent catalyst may be at least partially removed from the PCD table of the PDC by acid leaching.
Data Source
AI summary
Embodiments relate to polycrystalline diamond compacts and methods of manufacturing such compacts in which an at least partially leached polycrystalline diamond (“PCD”) table is infiltrated with first and second infiltrants. The first infiltrant includes a low viscosity cobalt-based and/or nickel-based alloy infiltrant. The second infiltrant (e.g., copper) is specifically selected to be more easily infiltrated and/or removed (e.g., leached) than a pure cobalt infiltrant. In an embodiment, a method includes forming a PCD table in the presence of a metal-solvent catalyst in a first high-pressure/high-temperature (“HPHT”) process. The PCD table may be at least partially leached to remove at least a portion of the metal-solvent catalyst therefrom. The leached PCD table and a substrate are subjected to a second HPHT process effective to bond the substrate to the leached PCD table while at least partially infiltrating the PCD table with at least the first and second infiltrants.