Silicon Carbide Powder Flow Index Control
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Solution Overview
Problem
Conventional methods for manufacturing silicon carbide powders often result in impurities from carbon raw materials, leading to high manufacturing costs and non-uniform powder sizes, which deteriorate the thermal, electrical, and mechanical properties of silicon carbide products, and also generate environmental hazards due to waste disposal issues.
Innovation Solution
A silicon carbide powder with specific flow index, repose angle, and tap density ranges is developed, allowing for improved bulk density and particle shape, enabling uniform temperature gradients and reduced defects in ingot growth, achieved through a process involving crushing, pulverization, etching, and classification to control particle size and surface characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods (Acheson method, reactive sintering, atmospheric pressure sintering, CVD) are used to manufacture silicon carbide, then silicon carbide products can be produced, but carbon raw materials remain as impurities that deteriorate thermal, electrical, and mechanical properties
Solution Approach 1:
The patent extracts and removes carbon impurities from the silicon carbide manufacturing process by using a carbon-free or low-carbon raw material (silicon oxide) and controlling the reaction environment to prevent carbon contamination, thereby achieving high purity silicon carbide while maintaining manufacturing feasibility
Solution Approach 2:
The patent changes the chemical parameters of the manufacturing process by using silicon oxide as the starting material instead of traditional carbon-containing precursors, and by controlling the reaction atmosphere and temperature parameters to achieve pure silicon carbide formation without carbon impurity incorporation
2Manufacturing precision
If heat treatment at high temperature (1,800°C to 2,100°C) under vacuum or inert gas condition is used to polymerize or cross-link silicon source and carbon source, then silicon carbide powder can be produced, but the manufacturing cost is high and the size of the powder is not uniform
Solution Approach 1:
The patent performs preliminary classification of the silicon carbide powder into specific size ranges (100-500 μm, 500-1000 μm, 1000-2000 μm, 2000-5000 μm) before use, ensuring uniform powder size for consistent ingot growth without requiring extremely high processing temperatures that would increase manufacturing costs
Solution Approach 2:
The patent uses a relatively low-cost manufacturing approach by avoiding the need for expensive high-temperature vacuum or inert gas treatment equipment, instead achieving uniform powder production through controlled reaction conditions and post-processing classification
3Ease of manufacture
If silicon carbide waste is disposed of through landfill, then waste management can be achieved, but environmental problems occur and disposal costs are high
Solution Approach 1:
The patent converts the harmful silicon carbide waste into a beneficial resource by using it as a raw material for producing new silicon carbide powder and ingots, thereby eliminating the need for landfill disposal and converting an environmental hazard into a valuable manufacturing feedstock
Solution Approach 2:
The patent recovers silicon carbide from waste materials (including crucible adsorbed waste and slurry) and reuses it as a raw material for new ingot production, preventing environmental pollution and reducing disposal costs while maintaining manufacturing feasibility
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 silicon carbide powder enhances the growth rate of ingots and reduces defects in wafers by ensuring uniform sublimation and thermal conductivity, while minimizing environmental impact through efficient waste management.
Implementation Method 1
The silicon carbide powder according to one embodiment can improve the growth rate of an SiC ingot
Data Source
AI summary
A silicon carbide powder including carbon; and silicon, wherein a flow index under a major principal consolidation stress of 9 kPa is 0.005 to 0.3, and a flow index under a major principal consolidation stress of 0.3 kPa is 0.01 to 0.5.