Polycrystalline Diamond Compacts With Cobalt-Nickel Alloy Substrate
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Solution Overview
Problem
Conventional polycrystalline diamond compacts (PDCs) face limitations in mechanical integrity and diamond growth when nickel is used as a catalyst, particularly in high-pressure/high-temperature bonding processes, which affects their erosion and corrosion resistance.
Innovation Solution
The use of a cobalt-nickel alloy cementing constituent in the cemented carbide substrate, where the PCD table is substantially free of nickel and includes cobalt in interstitial regions, enhances diamond growth and mechanical integrity, offering improved erosion and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nickel is used as a catalyst in HPHT bonding process, then diamond particles can bond to form PCD table, but mechanical integrity and erosion resistance deteriorate
Solution Approach 1:
The patent changes the chemical composition parameter of the catalyst from nickel-based to cobalt-based. Specifically, it uses a cobalt-nickel alloy where cobalt is the primary catalyst component (50-90 wt%), fundamentally altering the catalytic properties to achieve both mechanical integrity and erosion resistance while maintaining diamond bonding capability
Solution Approach 2:
The patent employs a composite catalyst system consisting of cobalt-nickel alloy rather than using pure nickel. This composite approach leverages the superior erosion resistance of cobalt while maintaining the catalytic effectiveness needed for diamond bonding, thereby resolving the contradiction between mechanical integrity and erosion resistance
2Productivity
If nickel is used as catalyst, then diamond growth is promoted, but corrosion resistance deteriorates
Solution Approach 1:
The patent modifies the catalytic composition by reducing nickel content to 10-50 wt% while increasing cobalt content to 50-90 wt%. This parameter change maintains sufficient catalytic activity for diamond growth while significantly improving corrosion resistance through cobalt's superior properties
3Object-affected harmful factors
If cobalt-nickel alloy is used as cementing constituent, then erosion resistance and corrosion resistance improve, but manufacturing complexity increases
Solution Approach 1:
The patent specifies precise compositional parameters for the cobalt-nickel alloy (cobalt: 50-90 wt%, nickel: 10-50 wt%) to optimize performance. By defining clear compositional ranges, the manufacturing process becomes more controllable and repeatable, actually reducing complexity despite using an alloy system
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
This approach results in PDCs with superior mechanical integrity and resistance to erosion and corrosion, making them suitable for applications like rotary drill bits and machining equipment.
Implementation Method 1
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 2
The substrate(s) and volume of diamond particles are then processed under HPHT conditions in the presence of a catalyst material that causes the diamond particles to bond to one another to form a matrix of bonded diamond grains
Implementation Method 3
The cobalt-nickel alloy cementing constituent of the cemented carbide substrate provides both erosion resistance and corrosion resistance to the cemented carbide substrate
Implementation Method 4
The cobalt-nickel alloy cementing constituent of the cemented carbide substrate provides both erosion resistance and corrosion resistance to the cemented carbide substrate
Implementation Method 5
The lack of a significant amount of nickel in the PCD table and the presence of cobalt in the PCD table is currently believed to catalyze diamond growth better than nickel
Data Source
AI summary
Embodiments of the invention relate to polycrystalline diamond compact (“PDC”) including a polycrystalline diamond (“PCD”) table that bonded to a cobalt-nickel alloy cemented carbide substrate. The cobalt-nickel alloy cemented carbide substrate provides both erosion resistance and corrosion resistance to the cemented carbide substrate. In an embodiment, a PDC includes a cemented carbide substrate including cobalt-nickel alloy cementing constituent. The PDC further includes a PCD table bonded to the cemented carbide substrate.