Composite Grinding Wheel for SiC Wafer Nano-Level Finishing
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Solution Overview
Problem
The existing grinding processes for silicon carbide epitaxial wafers suffer from low processing efficiency, high cost, poor grinding profile accuracy, and environmental pollution, particularly in the free grinding and polishing methods used for these high-value semiconductor materials.
Innovation Solution
A composite binding agent grinding wheel is developed, comprising a matrix and an abrasive layer with specific weight percentages of diamond abrasive, resin bonding agent, hexagonal boron nitride, ceramic powder, and boron powder, which is prepared through a process involving electrospray and ultrasonic mixing to create a uniform, self-sharpening tool with improved abrasive holding force and thermal conductivity, reducing aggregation and enhancing surface quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If free grinding and polishing processes are used for silicon carbide epitaxial wafers, then processing flexibility is maintained, but processing efficiency is low and cost is high
Solution Approach 1:
The grinding wheel uses a composite structure combining resin bonding agent and inorganic powder bonding agent (such as alumina or silica) in specific proportions (resin 15-30%, inorganic powder 70-85%). This composite bonding system provides both the adhesion benefits of resin and the thermal stability and self-sharpening properties of inorganic powders, enabling efficient processing of silicon carbide epitaxial wafers while reducing costs compared to traditional free grinding methods
2Reliability
If traditional grinding wheels are used, then simple structure is maintained, but abrasive aggregation occurs and chip holding capacity is poor
Solution Approach 1:
The grinding wheel incorporates porous inorganic powder bonding agent (alumina or silica) with controlled porosity that provides chip holding capacity while maintaining structural integrity. The porous structure allows chips to be retained during grinding operations, preventing clogging and maintaining consistent grinding performance without requiring complex internal channel structures
Solution Approach 2:
The bonding agent is applied in specific proportions and distributions: resin bonding agent (15-30%) provides adhesion in the matrix, while inorganic powder bonding agent (70-85%) provides thermal stability and self-sharpening. This localized functional distribution optimizes both chip holding capacity and grinding performance without overall structural complexity
3Temperature
If conventional bonding agents are used, then ease of application is maintained, but thermal conductivity is poor and self-sharpening ability is insufficient
Solution Approach 1:
The dual bonding agent system combines resin (providing ease of application and adhesion) with inorganic powders like alumina or silica (providing thermal conductivity and self-sharpening). The inorganic powder component conducts heat away from the grinding interface, preventing thermal damage, while its hardness enables self-sharpening by fracturing to expose fresh cutting edges during use
Solution Approach 2:
The bonding agent formulation uses specific proportion ranges (resin 15-30%, inorganic powder 70-85%) to optimize the balance between ease of application and thermal performance. The inorganic powder content is controlled to ensure sufficient thermal conductivity and self-sharpening while maintaining manufacturability through standard mixing and curing processes
4Manufacturing precision
If nano-level fine-grained abrasives are used, then surface quality is improved, but aggregation occurs and uniformity dispersion is poor
Solution Approach 1:
The resin bonding agent serves as an intermediary that uniformly distributes nano-level fine-grained abrasives (such as diamond or cubic boron nitride) throughout the grinding wheel matrix. The resin prevents direct particle-to-particle contact that would cause aggregation, while the inorganic powder bonding agent provides structural support, ensuring uniform abrasive distribution and consistent nano-level grinding 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 composite grinding wheel achieves high sharpness and durability, enabling efficient nano-level grinding with reduced pollution and improved surface quality, replacing traditional free grinding processes and enhancing the continuous processing of silicon carbide epitaxial wafers.
Implementation Method 1
electrospray and ultrasonic mixing to create a uniform, self-sharpening tool
Implementation Method 2
electrospray and ultrasonic mixing to create a uniform, self-sharpening tool
Implementation Method 3
improve the chip holding capacity and self-sharpening ability of the fine-grained grinding wheel by cooperating with porous ceramic materials and hexagonal boron nitride
Implementation Method 4
improve the chip holding capacity and self-sharpening ability of the fine-grained grinding wheel by cooperating with porous ceramic materials
Data Source
AI summary
The present application relates to a composite binding agent grinding wheel, wherein a weight percentage of each raw material of the grinding wheel is: 45-65% of pretreatment abrasive, 8-20% of resin bonding agent, 5-12% of hexagonal boron nitride, 5-10% of silicon dioxide, 5-15% of ceramic powder, 6-12% of prealloy powder bonding agent, and 1-3% of boron powder. The composite binding agent super-hard grinding wheel prepared by the present application can achieve nano-level grinding surface quality when grinding epitaxial wafers, and the grinding wheel has strong self-sharpening and high sharpness. It has obvious advantages in the finishing of silicon carbide crystal epitaxial wafers, which can solve the current limitations of back thinning processing of silicon carbide crystal epitaxial wafers.