RBSC CMP Pad Conditioner With Protruding Diamonds

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Solution Overview

Problem

Existing CMP pad conditioners with diamond particulate bonded to metal suffer from diamond particle loss due to chemical corrosion or mechanical stress, leading to potential damage of silicon wafers during reconditioning.

Innovation Solution

A CMP pad conditioner made from reaction bonded silicon carbide (RBSC) with embedded diamond particles, which is machinable by EDM and features uniformly or non-uniformly distributed protruding diamonds, providing high mechanical and thermal stability and reducing diamond detachment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If diamond particulate is bonded to metal for CMP pad conditioning, then cutting ability is improved, but diamond particle loss occurs due to chemical corrosion and thermal expansion mismatch

Engineering Contradiction:

Improvecutting abilityVSAvoiddiamond particle retention

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The invention uses a composite material consisting of diamond particles embedded in a reaction-bonded silicon carbide (RBSC) matrix. This composite structure combines the extreme hardness and cutting ability of diamond with the chemical stability and thermal compatibility of RBSC, resolving the contradiction between cutting performance and particle retention.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention changes the matrix material from metal to reaction-bonded silicon carbide, fundamentally altering the chemical and thermal parameters of the bonding medium. This parameter change eliminates chemical corrosion issues and thermal expansion mismatch, thereby preventing diamond particle loss while maintaining cutting ability.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If diamond protrusion is increased for better cutting performance, then wafer polishing quality is improved, but diamond particle detachment risk increases

Engineering Contradiction:

Improvewafer flatnessVSAvoiddiamond particle detachment

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The RBSC-diamond composite provides strong mechanical interlocking between the diamond particles and matrix, allowing diamond protrusions to be maintained at optimal heights for wafer flatness while preventing particle detachment through the robust composite structure.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention creates a conditioner disc where the diamond particles are permanently embedded in a stable RBSC matrix, eliminating the need to replace individual diamond particles. The entire disc can be reused until wear occurs, converting a potentially disposable particle system into a durable integrated system.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Ease of manufacture

If conventional metal bonding is used for diamond particles, then ease of manufacture is improved, but chemical corrosion causes diamond loss

Engineering Contradiction:

Improvebonding process simplicityVSAvoiddiamond particle loss

Core Design Contradiction:

Ease of manufactureVSLoss of substance

Solution Approach 1:

The invention changes the bonding material from metal to reaction-bonded silicon carbide, which has superior chemical stability and resistance to corrosion. This parameter change in material composition prevents diamond particle loss while maintaining manufacturability through established ceramic processing techniques.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention replaces the metal bonding system with a ceramic (RBSC) bonding system. This substitution uses different manufacturing principles typical of ceramic processing rather than metalworking, achieving both chemical stability and manufacturability through appropriate process selection.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical 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

The RBSC-based conditioner maintains diamond particles effectively, preventing wafer damage and enhancing polishing efficiency by maintaining a consistent polishing surface.

Implementation Method 1

machinable by electrical discharge machining (EDM), is used to create a CMP pad conditioner with protruding diamond particles

Methodology Applied

Scientific EffectElectrical discharge machining: Electrical Discharge Machining

Data Source

PatentUS12551984B2Methods of forming diamond composite CMP pad conditioner

Publication Date: 2026.02.17 II VI DELAWARE INC

AI summary

Methods of forming chemical-mechanical polishing/planarization pad conditioner bodies made from diamond-reinforced reaction bonded silicon carbide, with diamond particles protruding or “standing proud” of the rest of the surface, and uniformly distributed on the cutting surface. In one embodiment, the diamond particles are approximately uniformly distributed throughout the composite, but in other embodiments they are preferentially located at and near the conditioning surface. The tops of the diamond particles can be engineered to be at a constant elevation (i.e., the conditioner body can be engineered to be very flat). Exemplary shapes of the body may be disc or toroidal. The diamond particles can be made to protrude from the conditioning surface by preferentially eroding the Si/SiC matrix. The eroding may be accomplished by electrical discharge machining or by lapping/polishing with abrasive.