Abrasive-Free Polishing Composition for High Removal and Low Defects
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Solution Overview
Problem
Existing polishing compositions used for polishing materials like silicon carbide face challenges in achieving a high polishing removal rate while minimizing dent defects such as scratches and latent defects that are not detected in morphological observation, especially when abrasive is minimized or not used.
Innovation Solution
A polishing composition containing water, an oxidant, and a polishing removal accelerator, specifically a metal salt selected from lithium chloride to barium sulfate, is used without abrasive. This composition improves the polishing removal rate and reduces defects by optimizing the concentration ratio of the metal salt to the oxidant and maintaining a pH of 5.5 or higher.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If abrasive is minimized or not used in polishing composition, then dent defects such as scratches and latent defects are reduced, but polishing removal rate decreases
Solution Approach 1:
The invention changes the chemical parameters of the polishing composition by introducing specific metal salts (alkali metals, alkaline earth metals, or aluminum salts) and controlling their concentration ratios relative to oxidants. This chemical parameter modification enables high polishing removal rates without abrasive by enhancing the chemical reaction efficiency between the polishing composition and the polishing target material surface.
Solution Approach 2:
The invention creates a composite chemical system combining oxidants (such as peroxides, persulfates, or halogen-based oxidants) with specific metal salts in optimized concentration ratios. This composite composition synergistically enhances both the chemical etching capability and the material removal rate, achieving effective polishing without abrasive particles.
2Productivity
If polishing removal rate is improved by adding abrasive, then productivity increases, but dent defects such as scratches and latent defects increase
Solution Approach 1:
The invention replaces the mechanical action of abrasive particles with a chemically-enhanced process. By using metal salts that form soluble complexes with the polishing target material (such as silicon carbide) and controlling the chemical reaction through oxidant-metal salt interactions, the invention achieves material removal through chemical etching rather than mechanical abrasion, thereby eliminating scratches and latent defects while maintaining high removal rates.
Solution Approach 2:
The invention modifies the chemical composition parameters by introducing specific metal salts (alkali metals, alkaline earth metals, or aluminum salts) in controlled concentrations and optimizing their ratio to oxidants. This parameter optimization enables the polishing composition to achieve high removal rates through enhanced chemical reactivity without relying on abrasive mechanical action.
3Productivity
If oxidant concentration is increased to improve polishing removal rate, then productivity increases, but surface quality deteriorates due to increased defects
Solution Approach 1:
The invention optimizes the concentration ratio parameters between oxidants and metal salts rather than simply increasing oxidant concentration alone. By controlling the metal salt to oxidant concentration ratio within a specific range (0.01 to 10, preferably 0.05 to 5), the invention achieves balanced chemical reactivity that maintains high removal rates while preventing excessive etching that would cause surface defects.
Solution Approach 2:
The metal salt acts as an intermediary substance that mediates between the oxidant and the polishing target material. The metal salt forms soluble complexes with the material surface, and the oxidant then reacts with these complexes to achieve controlled material removal. This intermediary mechanism allows for more uniform and controllable polishing action compared to direct oxidant-material interaction, improving surface quality.
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 proposed polishing composition effectively enhances the polishing removal rate while significantly reducing the number of dent defects such as scratches and latent defects, even when used without abrasive, thereby improving the surface quality of materials like silicon carbide.
Implementation Method 1
the polishing liquid comprises: an oxidant whose redox potential is 0.5 V or more and which contains a transition metal
Implementation Method 2
a polishing removal accelerator, specifically a metal salt selected from lithium chloride to barium sulfate
Data Source
AI summary
Provided is a polishing composition that can effectively improve a polishing removal rate. According to the present invention, a polishing composition for polishing a polishing target material is provided. The polishing composition contains water, an oxidant, and a polishing removal accelerator, and does not contain abrasive. At least one metal salt selected from the group consisting of an alkali metal salt and an alkaline earth metal salt is contained as the polishing removal accelerator.