CMP Abrasive Conditioner With Segmented Particle Mounting
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Solution Overview
Problem
Conventional abrasive conditioners for CMP pads are costly to fabricate, have complex processing steps, and fail to maintain a desirable cut rate and effective working area due to abrasive particle separation and height variation issues.
Innovation Solution
An abrasive conditioner with protrusions on a substrate, where abrasive particles are attached via a bonding layer on a one-to-one basis, allowing controlled height and reduced separation, enhancing the effective working area and cut rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If abrasive particles are attached to a substrate with a bonding layer, then the abrasive particles can be fixed to prevent separation, but the bonding layer may extend between abrasive particles causing them to wear down to flush level, reducing effective working area
Solution Approach 1:
The substrate surface is segmented into discrete protrusions that are separated by depressions. Each abrasive particle is attached to an individual protrusion, creating isolated attachment points. This segmentation prevents the bonding layer from forming continuous pathways between adjacent abrasive particles, thereby maintaining effective working area while ensuring reliable particle fixation.
Solution Approach 2:
The bonding layer is applied locally only on the protrusions where abrasive particles are attached, rather than uniformly across the entire substrate surface. The depressions between protrusions remain free of bonding material, creating distinct zones: attachment zones (protrusions) and free zones (depressions). This localized bonding approach prevents bonding material from interfering with abrasive particle functionality while maintaining secure attachment.
2Reliability
If multiple processing steps are used to attach abrasive particles (drilling holes, inserting metal rods, bonding), then abrasive particles can be securely attached, but the fabrication process becomes complex and costly
Solution Approach 1:
The protrusion formation and abrasive particle attachment steps are merged into a more integrated process. Rather than drilling holes, inserting rods, and bonding separately, the protrusions are formed directly on the substrate and abrasive particles are attached in a more streamlined manner. This reduces the number of discrete processing steps while maintaining secure attachment through the protrusion-bonding layer-particle structure.
Solution Approach 2:
The intermediate metal rod component is extracted from the attachment structure. Instead of using metal rods as intermediaries between the substrate and abrasive particles, the substrate itself provides the attachment interface through its protrusions. This eliminates the need for hole drilling and rod insertion steps, simplifying the fabrication process while maintaining secure particle attachment.
3Productivity
If abrasive particles of greater particle sizes are used to maintain cut rate during extended service cycle, then cut rate is improved, but manufacturing cost increases and leveling problems occur due to greater particle size variation
Solution Approach 1:
The substrate surface is divided into multiple protrusions that can support abrasive particles of varying sizes. Each protrusion acts as an independent mounting point, allowing for a more uniform distribution of particle sizes across the conditioner surface. This segmentation enables better control over particle size selection and reduces the impact of size variation, allowing optimization of cut rate without proportionally increasing cost.
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 solution reduces fabrication and maintenance costs while maintaining a high cut rate and effective working area by securely attaching abrasive particles, minimizing particle separation and height variation.
Implementation Method 1
a plurality of abrasive particles respectively attached to the protrusions on a one-to-one correspondence basis via a bonding layer
Data Source
AI summary
An abrasive conditioner includes a substrate having a plurality of protrusions on a side thereof, the protrusions being separated from one another by a plurality of depressions, and a plurality of abrasive particles respectively attached to the protrusions on a one-to-one correspondence basis via a bonding layer, wherein the bonding layer extends into the depressions. Embodiments disclosed herein also include a method of fabricating an abrasive conditioner.