Free-Standing PCD Cutter Element for Rock Removal
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Solution Overview
Problem
Conventional polycrystalline diamond (PCD) rock removal elements face limitations due to limited PCD layer thickness, leading to wear and fracture issues, as well as macroscopic residual stress distributions, which result in reduced wear resistance and early failure during rock removal applications.
Innovation Solution
A free-standing PCD body with a functional working volume and a functional support volume, where the PCD material is invariant in diamond and metal network compositional ratio and metal elemental composition, and is macroscopically stress-free, allowing for increased wear resistance and thermal conductivity, and designed to withstand mechanical and thermal stresses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional PCD layer thickness is used (up to 2.5 mm), then the element can be manufactured with existing processes, but the PCD layer wears out quickly and fractures early
Solution Approach 1:
The patent changes the fundamental parameter of PCD layer thickness from conventional limits (up to 2.5 mm) to extended thicknesses (up to 100 mm or more). This parameter change is enabled by the new manufacturing process that uses external metal catalyst sources rather than relying on substrate infiltration, allowing thick PCD layers to be sintered without compromising structural integrity or incurring excessive residual stresses.
2Ease of manufacture
If molten metal infiltrates macroscopically into diamond powder mass, then bonding is achieved during sintering, but macroscopic residual stress distributions occur leading to early failure
Solution Approach 1:
The patent extracts the metal catalyst from the substrate and places it in separate external sources positioned adjacent to the diamond powder mass. This separation allows the metal to be supplied during sintering without creating macroscopic infiltration patterns that generate harmful residual stresses. The metal is taken out of the substrate and delivered through dedicated channels or reservoirs.
Solution Approach 2:
The patent introduces intermediate metal reservoirs or channels that mediate between the metal catalyst sources and the diamond powder mass. These intermediaries control the metal flow and distribution, ensuring uniform infiltration at the microscale while preventing macroscopic stress concentrations. The intermediary structures manage the metal delivery process to avoid direct macroscopic contact between large metal volumes and the PCD layer.
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 enhances the wear resistance and thermal conductivity of the PCD body, reducing the likelihood of fracture and extending the useful life of rock removal elements by distributing mechanical and thermal loads effectively, thereby improving the efficiency and reliability of rock removal processes.
Implementation Method 1
consolidating a mass of diamond particles and metal material under conditions of elevated temperature and pressure, the metal material melting and infiltrating into the diamond powder mass
Implementation Method 2
the metal material melting and infiltrating into the diamond powder mass
Implementation Method 3
The molten metal catalysts/solvents for carbon allow partial recrystallisation of the diamond to occur, the newly crystallized diamond forming diamond bonding of each diamond particle to its neighbors
Implementation Method 4
The PCD material is created by sintering of diamond powders facilitated by molten metal catalyst/solvent for carbon at elevated pressures and temperatures
Data Source
AI summary
A cutter element for rock removal comprises a free standing PCD body (801, 1801) comprising one or more physical volumes (1702, 1703), the PCD material being invariant in terms of the diamond and metal network compositional ratio and metal elemental composition such that each physical volume does not differ to any other physical volume with respect to diamond and metal network compositional ratio and metal elemental composition. The PCD body has a functional working volume (803) forming in use the region which comes into contact with the rock. A functional support volume (804) extant in use and having a proximal free surface extends from the functional working volume. The PCD body has an aspect ratio such that the ratio of the length (ae) of the longest edge of the circumscribing rectangular parallelepiped of the overall PCD body to the largest width (ad) of the smallest rectangular face from which the functional working volume extends of the circumscribing rectangular parallelepiped, is greater than or equal to 1.0.