Rhenium-Containing Cutting Tables for Self-Sharpening
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Solution Overview
Problem
Conventional cutting elements in earth-boring tools experience wear and damage due to high temperatures, axial loads, and impact forces during drilling, leading to decreased efficiency and operational life.
Innovation Solution
Incorporating rhenium-containing structures within a hard material, such as polycrystalline diamond, to enhance fracture resistance and facilitate controlled fracture, allowing for self-sharpening and improved cutting efficiency by forming new cutting edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cutting elements are used without rhenium-containing structures, then the cutting table provides initial cutting ability, but the cutting element suffers from wear and damage under high temperatures, axial loads, and impact forces, leading to decreased efficiency and operational life
Solution Approach 1:
Rhenium-containing structures are embedded within the hard material before the cutting element is put into service. These structures act as pre-positioned cushioning elements that absorb and distribute impact forces, reducing the transmission of shock loads to the cutting edges and thereby minimizing wear and damage during drilling operations
Solution Approach 2:
The cutting table is constructed as a composite material system combining hard material (such as polycrystalline diamond) with rhenium-containing structures. This composite provides both the cutting ability of the hard material and the shock-absorbing, wear-resistant properties of the rhenium structures, enhancing overall reliability and operational life under extreme drilling conditions
2Productivity
If the cutting table is made entirely of hard material, then it provides cutting ability, but it lacks fracture resistance and cannot facilitate controlled fracture for self-sharpening
Solution Approach 1:
The cutting table exhibits non-uniform local properties: regions containing rhenium structures have enhanced fracture resistance and different mechanical characteristics compared to regions of pure hard material. This local variation allows the cutting table to maintain overall cutting ability while providing specific zones that resist fracture or facilitate controlled fracture for self-sharpening
Solution Approach 2:
The rhenium-containing structures serve as intermediary elements between the hard material matrix and the applied loads. These intermediaries modify the stress distribution and fracture behavior of the cutting table, enabling controlled fracture patterns that promote self-sharpening while maintaining sufficient overall strength
3Productivity
If the cutting table undergoes wear during drilling, then it maintains cutting ability through self-sharpening, but excessive wear leads to separation of the cutting table from the supporting substrate
Solution Approach 1:
The rhenium-containing structures are pre-positioned to cushion and distribute the stresses that develop during wear. This beforehand cushioning prevents stress concentration at the cutting table-substrate interface, reducing the risk of separation even as wear progresses and new cutting edges form
Data Source
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AI summary
A cutting table comprises a polycrystalline hard material and at least one rhenium- containing structure within the polycrystalline hard material and comprising greater than or equal to about 10 weight percent rhenium. A cutting element, an earth-boring tool, and method of forming a cutting element are also described.