Leached PCD Elements Using Organic Acid Electrochemical Leaching

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Solution Overview

Problem

Conventional methods for leaching polycrystalline diamond (PCD) materials are inefficient and can damage the PCD table due to the use of highly corrosive solutions and the presence of metal-solvent catalysts, which reduce thermal stability and lead to chipping or cracking at elevated temperatures.

Innovation Solution

A method involving the use of a processing solution containing an organic acid and a divalent metal salt, applied in conjunction with an electrical current, to leach metallic materials from PCD materials, thereby improving the thermal stability and mechanical properties of the PCD material.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional leaching methods using highly corrosive solutions are used, then metallic materials can be removed from PCD materials, but the PCD table is damaged and thermal stability is reduced

Engineering Contradiction:

Improvethermal stabilityVSAvoiddamage to PCD table

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical parameters of the leaching solution by using organic acids (acetic acid, citric acid, tartaric acid) instead of conventional highly corrosive inorganic acids. This parameter change allows effective removal of metallic materials while preserving the PCD table structure and maintaining thermal stability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs disposable organic acid solutions that can be easily replaced and disposed of after use. These organic acid leaching solutions are less hazardous and can be safely discarded compared to conventional corrosive solutions, eliminating the need for complex waste treatment while effectively removing metallic contaminants.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Strength

If metal-solvent catalysts are present during HPHT processing, then diamond particles bond to form PCD material, but the catalysts cause chipping or cracking at elevated temperatures

Engineering Contradiction:

Improvebonding of diamond crystalsVSAvoidmechanical integrity at elevated temperatures

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent extracts and removes metal-solvent catalysts from the PCD material after HPHT processing through leaching with organic acid solutions. This extraction eliminates the harmful catalysts that cause chipping and cracking at elevated temperatures while preserving the bonded diamond crystal structure.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent performs preliminary leaching treatment on PCD materials before they are used in high-temperature applications. By removing metallic catalysts in advance through organic acid treatment, the material is prepared to withstand elevated temperatures without chipping or cracking during subsequent use.

Inventive Principle:

Principle #10Preliminary action

3Loss of substance

If highly corrosive leaching solutions are used, then metallic materials are removed from PCD materials, but environmental and safety hazards increase

Engineering Contradiction:

Improveremoval of metallic materialsVSAvoidenvironmental and safety hazards

Core Design Contradiction:

Loss of substanceVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful effect of corrosive solutions into a beneficial process by using organic acids that are inherently less hazardous. These organic acid solutions maintain the ability to dissolve and remove metallic materials while being environmentally friendly and safe for handling, thus converting a harmful process into a safe one.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 method effectively removes metallic materials from PCD materials, enhancing their thermal stability and mechanical properties, while also reducing the environmental and safety hazards associated with highly corrosive leaching solutions.

Implementation Method 1

exposing at least a portion of a polycrystalline diamond material to a processing solution, exposing an electrode to the processing solution, applying a positive charge to the polycrystalline diamond material, and applying a negative charge to the electrode

Methodology Applied

Scientific EffectElectrochemical leaching: Electrolysis

Data Source

PatentUS12296435B2Leached superabrasive elements and systems, methods and assemblies for processing superabrasive materials

Publication Date: 2025.05.13 US SYNTHETIC CORP

AI summary

A method of processing a superabrasive element includes providing a superabrasive element including a polycrystalline diamond table that includes a metallic material disposed in interstitial spaces defined within the polycrystalline diamond table. The method also includes leaching the metallic material from at least a volume of the polycrystalline diamond table to produce a leached volume in the polycrystalline diamond table.