Silicon Carbide Powder Manufacturing via Low-Temperature Oxidation
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Solution Overview
Problem
Conventional methods for manufacturing silicon carbide powders often result in high manufacturing costs and non-uniform particle sizes, leading to defects in silicon carbide wafers due to residual impurities and poor thermal, electrical, and mechanical properties.
Innovation Solution
A silicon carbide powder with a controlled particle size distribution and low content of fine particles, manufactured through a process involving sonication, crushing, pulverization, and etching, to minimize defects and improve wafer quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional heat treatment or electrification methods are used to manufacture silicon carbide, then silicon carbide can be produced from carbon raw materials, but residual carbon impurities remain that deteriorate thermal, electrical, and mechanical properties
Solution Approach 1:
The patent employs combustion oxidation using air or oxygen to completely oxidize carbon raw materials at temperatures between 600-1000°C, converting all carbon to carbon dioxide gas that escapes, leaving pure silicon carbide without residual carbon impurities that would otherwise deteriorate material properties
Solution Approach 2:
The patent controls the oxygen partial pressure and temperature parameters during the reaction process, maintaining conditions where carbon is completely oxidized to CO2 while silicon carbide forms and remains stable, achieving high purity product with improved thermal, electrical, and mechanical properties
2Manufacturing precision
If high temperature heat treatment (1,800°C to 2,100°C) is applied under vacuum or inert gas condition to polymerize or cross-link silicon and carbon sources, then silicon carbide powder can be manufactured, but manufacturing cost increases and particle size becomes non-uniform
Solution Approach 1:
The patent dramatically reduces the reaction temperature to 600-1000°C and changes the atmosphere from vacuum or inert gas to air or oxygen, enabling complete carbon oxidation to CO2 gas that escapes, leaving uniform silicon carbide particles without requiring expensive high-temperature equipment or inert gas supplies
Solution Approach 2:
By introducing oxygen or air as the reaction atmosphere, the patent enables complete oxidation of carbon to CO2, eliminating the need for high-temperature heat treatment and complex inert gas systems, thereby reducing manufacturing cost while achieving uniform particle size distribution
3Loss of substance
If silicon carbide waste and slurry are disposed of through landfill, then waste removal is achieved, but environmental problems occur and disposal costs increase
Solution Approach 1:
The patent converts silicon carbide waste and slurry, which would otherwise be harmful landfill waste, into valuable fine silicon carbide powder through a low-temperature oxidation process that removes organic contaminants and refines the particle size, transforming environmental liability into a useful product
Solution Approach 2:
By applying combustion oxidation with air or oxygen at 600-1000°C, the patent completely oxidizes organic contaminants in the waste to CO2 and H2O, while the inorganic silicon carbide remains as high-purity fine powder, eliminating environmental harm and creating valuable material
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 process enhances the growth rate of silicon carbide ingots and reduces defects in wafers by ensuring appropriate porosity and preventing fine particle attachment, resulting in improved thermal, electrical, and mechanical properties.
Implementation Method 1
a mass ratio of silicon carbide particles having a particle diameter of less than 50 μm after sonication is 10 wt % or less
Data Source
AI summary
A silicon carbide powder having silicon carbide particles including carbon and silicon, wherein a mass ratio of silicon carbide particles having a particle diameter of less than 50 μm after sonication is 10 Wt % or less.