Polycrystalline Diamond Compact Convex Interface Impact Resistance
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Solution Overview
Problem
Conventional polycrystalline diamond compacts (PDCs) lack improved mechanical properties, particularly in impact resistance, which is essential for applications like rotary drill bits and machining equipment.
Innovation Solution
The development of PDCs with a substrate having a convexly-curved interfacial surface bonded to a polycrystalline diamond (PCD) table, where the convexly-curved surface enhances impact resistance by increasing the resistance to impact loads, allowing for a PCD table with a minimum thickness of about 0.0050 inch and average grain size of 30 μm or less, exhibiting 30 to 80 hits to failure at a 50% probability in a 40 J repeating vertical weight drop test.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional planar interfacial surface is used in PDCs, then the manufacturing process is simple, but the impact resistance is insufficient
Solution Approach 1:
The substrate interfacial surface is designed with a convex curvature instead of a conventional planar surface. This curved interface configuration increases the resistance to impact loads by distributing stress more effectively across the bonding area between the substrate and PCD table, thereby improving impact resistance without significantly complicating the manufacturing process
2Productivity
If the PCD table thickness is reduced to improve productivity, then manufacturing efficiency increases, but the impact resistance decreases
Solution Approach 1:
The convex curvature of the substrate interface is optimized to work with thinner PCD tables. By changing the geometric parameter of the interface from planar to convex, the stress distribution is improved, allowing the PCD table to be made thinner while maintaining adequate impact resistance. This enables higher productivity through reduced material usage and faster manufacturing
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 convexly-curved interfacial surface configuration significantly improves the impact resistance of PDCs, enabling them to withstand a higher number of impacts before failure, making them more suitable for demanding mechanical applications.
Implementation Method 1
The configuration of the convexly-curved interfacial surface is currently believed to improve the impact resistance of the PDC. The convexly-curved interfacial surface extends inwardly directly from at least one side surface of the substrate to define at least one peripheral edge therebetween
Implementation Method 2
The diamond table is formed and bonded to a substrate using a high-pressure/high-temperature ('HPHT') process
Implementation Method 3
The catalyst material is often a metal-solvent catalyst (e.g., cobalt, nickel, iron, or alloys thereof) that is used for promoting intergrowth of the diamond particles
Implementation Method 4
a constituent of the cemented carbide substrate, such as cobalt from a cobalt-cemented tungsten carbide substrate, liquefies and sweeps from a region adjacent to the volume of diamond particles into interstitial regions between the diamond particles during the HPHT process
Data Source
AI summary
Embodiments of the invention relate to polycrystalline diamond compacts including a substrate having a convexly-curved interfacial surface bonded to a polycrystalline diamond table. In an embodiment, a polycrystalline diamond compact includes a substrate including at least one side surface and a convexly-curved interfacial surface that may, in some embodiments, extend inwardly directly from the at least one side surface to form at least one peripheral edge therebetween. The polycrystalline diamond compact further includes a polycrystalline diamond table bonded to the convexly-curved interfacial surface of the substrate.