Cutting Element Substrate With κ-Carbide Precipitates
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Solution Overview
Problem
Polycrystalline diamond cutting elements used in earth-boring tools face thermal damage due to catalyst material, such as cobalt, which contributes to brittleness and difficulty in securing the PDC to a supporting substrate, and existing methods struggle to achieve thermal stability and mechanical stability simultaneously.
Innovation Solution
A method involving a precursor composition of tungsten carbide particles, a binding agent, and discrete particles of cobalt, aluminum, gallium, germanium, silicon, and tin, subjected to consolidation and high temperature/high pressure processes to form a cutting element with a thermally stable κ-carbide precipitate within interstitial spaces, enhancing thermal and mechanical stability without leaching catalyst material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If catalyst material (e.g., cobalt) is used in the supporting substrate to form PDC cutting elements, then the diamond grains can be sintered together effectively, but the catalyst material remains in interstitial spaces causing thermal damage and brittleness
Solution Approach 1:
The patent extracts and removes the harmful catalyst material from the interstitial spaces between diamond grains through acid leaching processes. This eliminates the source of thermal damage and brittleness while preserving the beneficial inter-granular bonds formed during sintering.
Solution Approach 2:
The patent changes the chemical composition parameters of the interstitial spaces by removing catalyst material through controlled acid treatment. This parameter change transforms the interstitial spaces from containing harmful catalyst to being filled with thermally stable materials or vacancies, reducing thermal damage.
2Object-affected harmful factors
If catalyst material is completely removed from the PDC through leaching, then thermal damage is reduced, but the PDC becomes more brittle and vulnerable to stresses
Solution Approach 1:
The patent introduces intermediary materials to fill the interstitial spaces after catalyst removal. These intermediary materials provide structural support and stress distribution, mediating between the diamond grains to maintain mechanical strength without causing thermal damage.
Solution Approach 2:
The patent creates a composite structure where diamond grains are combined with thermally stable materials in the interstitial spaces. This composite approach provides both thermal stability (by excluding catalyst) and mechanical strength (through the supporting framework of the composite structure).
3Object-affected harmful factors
If a fully leached PDC is used, then thermal stability is improved, but it becomes difficult to secure the PDC to the supporting substrate
Solution Approach 1:
The patent applies preliminary action by forming the PDC with catalyst material present during sintering to ensure proper diamond grain bonding, then subsequently removing the catalyst through leaching. This sequence ensures the PDC is already bonded before catalyst removal, avoiding the manufacturing difficulties of securing fully leached PDC.
4Ease of manufacture
If partial leaching of catalyst material is performed, then some thermal damage is reduced, but catalyst material remains in interstitial spaces causing ongoing thermal issues
Solution Approach 1:
The patent applies partial leaching when complete removal is not necessary or would cause excessive brittleness, and applies excessive leaching (complete removal) when thermal stability is the priority. The degree of leaching is adjusted based on the specific application requirements, balancing thermal protection against mechanical strength.
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 results in a cutting element with improved thermal stability and mechanical properties, reducing brittleness and enhancing the attachment of the diamond table to the substrate, while maintaining the stability of the cutting element during operation.
Implementation Method 1
subjected to consolidation and high temperature/high pressure processes to form a cutting element with a thermally stable κ-carbide precipitate within interstitial spaces
Implementation Method 2
forming a cutting element with a thermally stable κ-carbide precipitate within interstitial spaces
Implementation Method 3
enhancing thermal and mechanical stability without leaching catalyst material
Data Source
AI summary
A method of forming a supporting substrate for a cutting element comprises forming a precursor composition comprising discrete WC particles, a binding agent, and discrete particles comprising Co, one or more of Al, Be, Ga, Ge, Si, and Sn, and one or more of C and W. The precursor composition is subjected to a consolidation process to form a consolidated structure including WC particles dispersed in a homogenized binder comprising Co, W, C, and one or more of Al, Be, Ga, Ge, Si, and Sn. A method of forming a cutting element, a cutting element, a related structure, and an earth-boring tool are also described.