Polycrystalline Diamond Cutters with Low-Melting Binder
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Solution Overview
Problem
Conventional superabrasive compacts face challenges in achieving optimal abrasion resistance and minimizing stress on polycrystalline diamond tables due to high melting temperatures of binders, which can lead to damage during the high pressure high temperature (HPHT) process and reduce the performance of earth-boring tools.
Innovation Solution
A superabrasive compact with a substrate having a binder with a melting point between 600°C to 1350°C, incorporating free elements, compounds, or eutectic alloys that reduce the melting temperature of the binder, allowing for a lower HPHT process temperature and minimizing stress on the polycrystalline diamond table, thereby enhancing abrasion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a binder with high melting temperature is used in the substrate, then the substrate can withstand high temperatures during HPHT process, but the polycrystalline diamond table experiences excessive stress and damage during HPHT process
Solution Approach 1:
The patent changes the melting temperature parameter of the binder from conventional high melting point (e.g., nickel-based binders with melting points above 1000°C) to a lower range (600°C to 1350°C) by using specific binder compositions. This parameter change allows the HPHT process to be conducted at lower temperatures, reducing thermal stress on the polycrystalline diamond table while still achieving effective bonding and sintering.
Solution Approach 2:
The substrate is formulated as a composite material containing the binder mixed with metal carbide particles (such as tungsten carbide, nickel, chromium, or cobalt). This composite structure provides both the low melting point characteristics of the binder for reduced HPHT temperatures and the mechanical strength of the metal carbide particles, creating a balanced substrate that protects the polycrystalline diamond table during processing.
2Strength
If high HPHT process temperature is used to attach substrate to polycrystalline diamond table, then strong bonding is achieved, but abrasion resistance of polycrystalline diamond table deteriorates
Solution Approach 1:
The patent changes the temperature parameter of the HPHT process from conventional high temperatures (above 1000°C) to a lower range (600°C to 1350°C) by using a low-melting-point binder. This temperature reduction prevents excessive thermal stress that would compromise the abrasion resistance of the polycrystalline diamond table, while the binder composition ensures adequate bonding strength is achieved at these lower temperatures.
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 reduced melting temperature of the binder in the substrate allows for a lower HPHT process temperature, reducing stress on the polycrystalline diamond table and improving its abrasion resistance, leading to enhanced performance in material removal operations and extended service life of earth-boring tools.
Implementation Method 1
The substrate has a binder with a melting point that is from about 600° C. to about 1350° C. at a pressure from about 30 kbar to about 100 kbar
Implementation Method 2
subjecting the substrate and the plurality of superabrasive particles to a high pressure high temperature process suitable for producing the superabrasive compact
Data Source
AI summary
Superabrasive compacts and methods of making superabrasive compacts are disclosed. A superabrasive compact includes a polycrystalline diamond table and a substrate attached to the polycrystalline diamond table. The substrate includes a hard metal carbide and a binder having a compound with a composition of AxByCz, where A and B are transition metals, where C is carbon, and where 0≤x≤7, 0≤y≤7, x+y=7, and 0≤z≤3.