PCD Compact Elements with Ni-Cr-Co Binder Substrates
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Solution Overview
Problem
Polycrystalline diamond (PCD) composite tools face issues with erosion resistance due to the deterioration of mechanical properties at high temperatures and the low erosion resistance of cemented carbide substrates, leading to rapid wear and potential cutter failure in drilling applications.
Innovation Solution
A cemented carbide substrate with a specific composition and grain size distribution, including tungsten carbide particles bonded by a binder alloy of Co, Ni, and Cr, and a tailored WC grain size distribution, enhances the erosion resistance and mechanical properties of PCD composite compact elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cemented carbide substrates with cobalt binder are used for PCD composite tools, then the substrate provides adequate bonding and catalytic activity for diamond growth, but the substrate exhibits low erosion resistance and rapid wear in high-temperature drilling applications
Solution Approach 1:
The invention changes the chemical composition parameters of the binder material by replacing cobalt with nickel and chromium. The binder comprises nickel (40-70 wt%), chromium (5-30 wt%), and cobalt (0-10 wt%), which fundamentally alters the substrate's resistance to erosion while maintaining mechanical properties at high temperatures
Solution Approach 2:
The invention creates a composite cemented carbide substrate by combining tungsten carbide particles with a multi-element binder alloy (nickel-chromium-cobalt). This composite structure provides both the erosion resistance of nickel-chromium and the catalytic activity needed for diamond growth, resolving the contradiction between erosion resistance and mechanical strength
2Productivity
If PCD material is used in high-temperature drilling applications, then cutting performance is achieved, but the mechanical properties of PCD deteriorate due to residual solvent/catalyst material
Solution Approach 1:
The invention extracts and removes the harmful residual solvent/catalyst material from the PCD structure by replacing cobalt-based catalysts with nickel-chromium-based binders that do not remain as residual phases in the sintered PCD, thereby maintaining hardness and strength at high temperatures while preserving cutting performance
Solution Approach 2:
The invention changes the thermal stability parameters of the PCD material by eliminating residual cobalt phases through the use of nickel-chromium binders. This parameter change allows the PCD to maintain its mechanical properties at elevated temperatures during drilling operations
3Ease of operation
If carbide substrate is exposed to drilling mud and abrasive particles, then cooling and drilling function are performed, but the substrate erodes quickly leading to cutter failure
Solution Approach 1:
The invention creates a composite binder system combining nickel, chromium, and cobalt that provides both the functional properties needed for drilling (cooling, lubrication) and enhanced erosion resistance. The nickel-chromium-cobalt alloy forms a protective matrix that resists penetration by abrasive particles while maintaining operational functionality
Solution Approach 2:
The invention changes the chemical composition parameters of the binder to increase corrosion and erosion resistance. The specific composition ranges (nickel 40-70%, chromium 5-30%, cobalt 0-10%) are optimized to provide durability against drilling mud and abrasive particles while maintaining the substrate's functional performance
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 significantly improves the erosion resistance, hardness, transverse rupture strength, indentation fracture toughness, and wear-resistance of the cemented carbide substrates, resulting in enhanced performance and longevity of PCD composite compact elements in high-temperature drilling applications.
Implementation Method 1
the binder material comprising an alloy of Co, Ni and Cr
Implementation Method 2
a cemented carbide substrate comprising tungsten carbide particles bonded together by a binder material
Implementation Method 3
A material wholly or partly filling the interstices may be referred to as filler material. PCD may be formed in the presence of a sintering aid such as cobalt, which is capable of promoting the inter-growth of diamond grains. The sintering aid may be referred to as a solvent/catalyst material for diamond, owing to its function of dissolving diamond to some extent and catalysing its re-precipitation.
Implementation Method 4
A solvent/catalyst for diamond is understood to be a material that is capable of promoting the growth of diamond or the direct diamond-to-diamond inter-growth between diamond grains at a pressure and temperature condition at which diamond is thermodynamically stable.
Implementation Method 5
PCD may be made by subjecting an aggregated mass of diamond grains to an ultra-high pressure and temperature
Data Source
AI summary
A polycrystalline diamond composite compact element comprises a body of polycrystalline diamond material and a cemented carbide substrate bonded to the body of polycrystalline material. The cemented carbide substrate has tungsten carbide particles bonded together by a binder material comprising an alloy of Co, Ni and Cr. The tungsten carbide particles form between 70 weight percent and 95 weight percent of the substrate. The binder material comprises between about 10 to 50 wt. % Ni, between about 0.1 to 10 wt. % Cr, and the remainder weight percent comprising Co. The size distribution of the tungsten carbide particles in the substrate has fewer than 17 percent of the carbide particles with a grain size of equal to or less than about 0.3 microns, between about 20 to 28 percent of the tungsten carbide particles having a grain size of between about 0.3 to 0.5 microns; between about 42 to 56 percent of the tungsten carbide particles having a grain size of between about 0.5 to 1 microns; less than about 12 percent of the tungsten carbide particles being greater than 1 micron; and the mean grain size of the tungsten carbide particles is about 0.6+0.2 microns.