PCD Element Side Surface Catalyst Retention
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Solution Overview
Problem
Polycrystalline diamond (PCD) elements used in industrial devices face challenges in balancing the benefits and drawbacks of catalyst removal, particularly in maintaining strength and thermal stability, as leaching the catalyst can compromise the PCD layer's impact resistance and thermal stability, and existing leaching methods often require destructive testing and batch processing.
Innovation Solution
A PCD element design where the catalyst is selectively leached from the top and intermediate surfaces but not the side surface, using a protective member to prevent leaching on the side surface, allowing for controlled leaching with a liquid such as acid without disrupting the diamond body matrix, thereby maintaining the side surface's strength while improving abrasion resistance and thermal stability on the exposed surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the catalyst is leached from the PCD layer to improve abrasion resistance and thermal stability, then the PCD layer's ability to withstand high temperatures and resist wear is improved, but the impact strength of the PCD layer decreases
Solution Approach 1:
The patent applies local quality by creating different leaching conditions for different regions of the PCD element. The top surface and intermediate surfaces are leached to improve thermal stability and abrasion resistance, while the side surfaces are protected from leaching to maintain impact strength. This is achieved through selective masking during the leaching process, where maskant material is applied to specific surfaces to control which areas undergo catalyst removal.
2Reliability
If the catalyst is leached from the PCD layer to improve thermal stability, then the PCD layer's resistance to thermal degradation is improved, but the structural integrity of the PCD layer is compromised
Solution Approach 1:
The patent implements local quality by selectively removing catalyst from specific regions while preserving it in others. The top and intermediate surfaces undergo leaching to enhance thermal stability, while the side surfaces retain their catalyst content to maintain structural integrity. This regional differentiation allows the PCD element to have optimized properties in different locations based on functional requirements.
3Productivity
If batch leaching is used to process multiple PCD elements, then productivity is improved, but the complexity of controlling consistent leaching across all surfaces increases
Solution Approach 1:
The patent applies segmentation by dividing the PCD element into distinct regions with different leaching requirements. The top surface, intermediate surfaces, and side surfaces are treated as separate zones that require different leaching approaches. This segmentation is implemented through selective masking, where different surfaces are masked or unmasked during the batch leaching process to achieve the desired regional differentiation in catalyst content.
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 enhances the usable life of PCD elements by maintaining higher impact strength on the side surface while improving abrasion resistance and thermal stability on the leached surfaces, reducing the risk of physical damage and extending the device's operational life, particularly in applications like subterranean drilling.
Implementation Method 1
a liquid able to leach the catalyst from the PCD element without disrupting the diamond body matrix in the PCD element
Implementation Method 2
a protective member disposed on a side surface of the PCD element but not on at least a portion of a top surface or an intermediate surface of the PCD element
Data Source
AI summary
The disclosure provides a PCD element containing a substrate and a PCD layer. The PCD has a top surface, a side surface, an intermediate surface, an unleached region containing a diamond body matrix and an interstitial matrix including a catalyst, and a leached region containing a diamond body matrix and empty space in the place of the interstitial matrix. The catalyst has been leached from the empty space in the place of the interstitial matrix. The unleached region is adjacent to a substantial portion of the side surface and the leached region is not adjacent to a substantial portion of the side surface, and the leached region is adjacent to the top surface or the intermediate surface. The disclosure also provides a system and method for leaching a PCD element including a liquid able to leach a catalyst and a protective member.