Polycrystalline Diamond Drill Blanks with Curved Carbide Interface
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Solution Overview
Problem
Polycrystalline diamond cutters face high tensile residual stresses and shock wave damage at the diamond surface and interface, leading to reduced durability during rock drilling applications.
Innovation Solution
A cutting element with a substrate having an inner face and an annular face featuring uneven geometries, such as protrusions and slopes, designed to deflect shock waves, combined with a superabrasive layer subjected to high pressure high temperature conditions to enhance mechanical bonding and stress distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the diamond/carbide interface contains non-planar features designed to increase mechanical bond, then the mechanical bond is improved, but high tensile residual stresses and shock wave damages still exist at the diamond surface and near the interface
Solution Approach 1:
The patent applies curvature by replacing flat interface surfaces with spherical or curved features. Specifically, the invention incorporates a spherical feature at the interface between the diamond compact and carbide substrate, which redistributes stress fields and prevents concentration of tensile stresses at sharp corners or flat interfaces, thereby reducing both residual stresses and shock wave damages while maintaining mechanical bond strength
Solution Approach 2:
The patent applies local quality by creating different geometric features at different locations of the interface. The spherical feature is positioned specifically at the diamond-carbide interface where stress concentration occurs, while other portions of the cutting element maintain their original structure. This localized modification targets the specific problem area without altering the entire structure
2Ease of manufacture
If conventional flat interface geometry is used, then manufacturing is simpler, but shock waves cause high tensile residual stresses and diamond chip/fracture damage
Solution Approach 1:
The spherical feature at the diamond-carbide interface redistributes shock wave energy and prevents stress concentration that occurs with flat geometries. This curved interface design maintains manufacturability through HPHT processing while significantly improving reliability by reducing tensile residual stresses and preventing diamond chip and fracture damage during rock drilling operations
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 solution significantly increases resistance to shock waves and reduces diamond chip and fracture occurrences during drilling, extending the cutter's lifespan and reducing drilling costs.
Implementation Method 1
subjecting the substrate and the superabrasive layer to a high pressure high temperature condition
Data Source
AI summary
A cutting element and a method of making the superabrasive cutter are disclosed. The cutting element has a substrate and a superabrasive layer. The substrate has an inner face and an annular face. The inner face may have a center. The annular face may have a periphery. A superabrasive layer attaches to the substrate along the inner face and the annular face, wherein the inner face slopes outwardly and upwardly from the center at an angle ranging from between about 1° and about 7° from horizontal.