Precisely Shaped Abrasive Elements for CMP Pad Wear Decoupling

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Solution Overview

Problem

Conventional abrasive articles for CMP processes face challenges in independently controlling polishing pad wear rate and surface finish, leading to inconsistent performance and increased cost of ownership due to the correlation between primary abrasive feature density and both parameters.

Innovation Solution

Abrasive articles with controlled areal density and height offset between primary and secondary abrasive features, allowing independent modulation of polishing pad wear rate and surface roughness, featuring monolithic abrasive elements with precise shaping and low porosity, and optionally coated with CVD diamond for enhanced durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional abrasive articles use higher density of primary abrasive features to increase material removal rate, then productivity improves, but polishing pad wear rate increases and surface finish consistency deteriorates

Engineering Contradiction:

Improvematerial removal rateVSAvoidsurface finish consistency

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The abrasive article segments abrasive features into two distinct populations: primary abrasive features (higher density, smaller size) for material removal and secondary abrasive features (lower density, larger size) for surface finishing. This segmentation allows independent optimization of each function, resolving the contradiction between productivity and surface finish consistency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the abrasive article have different feature densities and sizes. The primary abrasive features are distributed at higher density for aggressive material removal, while secondary abrasive features are distributed at lower density for consistent surface finishing. This local quality variation enables simultaneous achievement of high productivity and reliable surface finish.

Inventive Principle:

Principle #3Local quality

2Manufacturing precision

If conventional abrasive articles increase primary abrasive feature density to maintain surface roughness, then surface finish is maintained, but polishing pad wear rate increases

Engineering Contradiction:

Improvesurface roughness controlVSAvoidpolishing pad wear rate

Core Design Contradiction:

Manufacturing precisionVSLoss of substance

Solution Approach 1:

The abrasive features are segmented into two functional groups: primary features that generate controlled roughness at lower density, and secondary features that maintain surface finish at higher density. This segmentation reduces overall pad wear while maintaining surface roughness control.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes key parameters including feature density (primary features at 0.5-2.0 per mm², secondary features at 2.0-5.0 per mm²), feature size (primary features 5-20 µm, secondary features 20-50 µm), and height offset (10-50 µm) to optimize the balance between surface roughness control and pad wear rate.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If conventional abrasive articles use monolithic abrasive elements with precise shaping, then manufacturing precision improves, but device complexity increases

Engineering Contradiction:

Improveabrasive feature geometry controlVSAvoidfabrication process complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent employs precise control of fabrication parameters including green body composition (95-99 wt% abrasive material), pressing pressure (10-50 MPa), sintering temperature (1800-2200°C), and feature geometry (height, width, spacing) to achieve monolithic elements with high manufacturing precision while managing fabrication complexity.

Inventive Principle:

Principle #35Parameter changes

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 abrasive articles provide a slower pad wear rate decay and consistent CMP performance by decoupling pad wear rate from surface roughness, reducing debris generation and extending polishing pad lifetime.

Implementation Method 1

optionally coated with CVD diamond for enhanced durability

Methodology Applied

Scientific EffectChemical vapor deposition: Chemical Vapour Deposition

Implementation Method 2

The abrasive articles provide a slower pad wear rate decay by decoupling pad wear rate from surface roughness

Methodology Applied

Scientific EffectAbrasion: Abrasion

Data Source

PatentUS20250326089A1Abrasive elements with precisely shaped features, abrasive articles fabricated therefrom and methods of making thereof

Publication Date: 2025.10.23 3M INNOVATIVE PROPERTIES CO

AI summary

An abrasive article includes a plurality of abrasive features disposed on one or more abrasive elements. Each of the one or more abrasive elements includes a base having a first major surface from which the plurality of abrasive features extends. A first set of the plurality of abrasive features (i) has an average height, H1avg, (ii) a standard deviation of less than 10% of H1avg, and (iii) comprises between 5 and 130 abrasive features.