Carbonate PCD Sintering for Hardness-Toughness Balance

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Solution Overview

Problem

Conventional polycrystalline diamond (PCD) materials face limitations in achieving a balance between hardness and toughness due to high metal content, which leads to brittleness and reduced wear resistance, especially in harsh drilling environments where wear, fatigue, and impact cracking are common failure modes.

Innovation Solution

A method of forming a carbonate-based polycrystalline diamond body by mixing a sintering agent with diamond powder and forming an infiltration layer using alkaline earth metal carbonates, subjected to high pressure high temperature (HPHT) conditions, eliminating the need for transition metal catalysts and promoting diamond-to-diamond bonding with increased wear resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If higher metal content is used in conventional PCD, then toughness is improved, but hardness decreases

Engineering Contradiction:

ImprovetoughnessVSAvoidhardness

Core Design Contradiction:

StrengthVSTemperature

Solution Approach 1:

The patent changes the chemical composition parameters by replacing transition metal catalysts with alkaline earth metal carbonates (such as calcium carbonate, strontium carbonate, or barium carbonate). This substitution fundamentally alters the material parameters, enabling the formation of carbonate-based PCD with optimized hardness and toughness balance without the trade-off inherent in conventional metal-based PCD

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material system combining diamond particles with carbonate materials (alkaline earth metal carbonates). This composite structure allows the diamond to provide extreme hardness while the carbonate binder provides toughness and ductility, achieving both properties simultaneously rather than requiring a compromise between them

Inventive Principle:

Principle #40Composite materials

2Strength

If higher metal content is used in conventional PCD, then bonding is improved, but wear resistance decreases

Engineering Contradiction:

ImprovebondingVSAvoidwear resistance

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters by replacing transition metal catalysts with alkaline earth metal carbonates. This substitution fundamentally alters the material parameters, enabling the formation of carbonate-based PCD with optimized hardness and toughness balance without the trade-off inherent in conventional metal-based PCD

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The carbonate materials used as binders can be consumed or transformed during the HPHT process to facilitate diamond bonding, and their lower cost compared to transition metals allows for optimized formulations that prioritize wear resistance over binder cost

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Strength

If transition metal catalysts are used, then diamond-to-diamond bonding is facilitated, but brittleness increases

Engineering Contradiction:

ImprovebondingVSAvoidbrittleness

Core Design Contradiction:

StrengthVSStability of the object's composition

Solution Approach 1:

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The carbonate materials serve as intermediary substances during the HPHT process, facilitating diamond-to-diamond bonding through their unique chemical and physical properties. The carbonate binder acts as a mediator that enables bonding while maintaining ductility and reducing brittleness compared to transition metal catalysts

Inventive Principle:

Principle #24Intermediary (Mediator)

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 resulting carbonate-based PCD exhibits improved wear resistance and thermal stability, with higher wear scores in abrasion tests and reduced brittleness, making it suitable for demanding drilling applications.

Implementation Method 1

subjecting the diamond layer and the infiltration layer to high pressure high temperature conditions

Methodology Applied

Scientific EffectHigh pressure high temperature (HPHT) processing:

Implementation Method 2

Conventional PCD may be formed by subjecting diamond particles in the presence of a suitable solvent metal catalyst material to processing conditions of high pressure/high temperature (HPHT), where the solvent metal catalyst promotes desired intercrystalline diamond-to-diamond bonding between the particles, thereby forming a PCD structure

Methodology Applied

Scientific EffectSintering: Sintering

Data Source

PatentUS11731092B2Method of making carbonate PCD and sintering carbonate PCD on carbide substrate

Publication Date: 2023.08.22 SCHLUMBERGER TECH CORP

AI summary

A method of forming a polycrystalline diamond body includes mixing a sintering agent with diamond powder to form a premixed layer, the sintering agent including at least one alkaline earth metal carbonate; forming an infiltration layer adjacent to the premixed layer, the infiltration layer including an infiltrant material including at least one alkaline earth metal carbonate; and subjecting the premixed layer and the infiltration layer to high pressure high temperature conditions.