Polysilocarb-Derived Silicon Carbide Purity and Cost Reduction
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Solution Overview
Problem
Current methods for producing high purity silicon carbide (SiC) are costly, inefficient, and unable to meet the demand for semiconductor-grade materials, due to contamination issues and high production costs.
Innovation Solution
The development of polysilocarb-derived silicon carbide compositions, which involve self-sintered submicron silicon carbide particles with minimal impurities, produced through a process that eliminates the need for sintering aids and reduces production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to produce high purity silicon carbide, then purity can be achieved, but production costs become excessively high and productivity remains low
Solution Approach 1:
The invention changes the chemical composition parameters of the starting materials by using polysiloxane and carbon black with specific ratios, and modifies the sintering parameters by conducting the process in an inert atmosphere at controlled temperatures to achieve high purity SiC with improved production efficiency
Solution Approach 2:
The invention extracts and eliminates harmful impurities by using carbon black as a reducing agent that removes oxygen and other contaminants from the polysiloxane-derived SiC precursor, achieving high purity without requiring expensive purification steps
2Ease of manufacture
If conventional sintering aids are used to produce SiC, then sintering can proceed, but impurity levels increase and purity decreases
Solution Approach 1:
The invention applies self-service by using carbon black as both a sintering aid and a purifying agent - the carbon black reduces and removes impurities from the system while simultaneously facilitating the sintering process, eliminating the need for separate purification operations
Solution Approach 2:
Carbon black serves as an intermediary substance that mediates between the polysiloxane precursor and the final SiC product, facilitating oxygen removal and impurity elimination while enabling complete sintering without requiring traditional sintering aids that would introduce contaminants
3Manufacturing precision
If high purity starting materials are used, then product purity improves, but production costs increase significantly
Solution Approach 1:
The invention uses relatively inexpensive starting materials (polysiloxane and carbon black) that can be readily available commodities, replacing expensive high-purity starting materials. The carbon black acts as a disposable reducing agent that consumes impurities during the sintering process
Solution Approach 2:
The invention converts the typically harmful effect of carbon (which can cause contamination) into a beneficial purifying mechanism by using carbon black as a reducing agent that removes oxygen and other impurities from the SiC lattice during sintering, achieving high purity through a counterintuitive approach
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
This approach enables the production of high purity SiC with impurities below 100 ppm, achieving purities of at least 99.999% and reducing production costs, making it viable for large-scale commercial applications.
Implementation Method 1
self-sintered submicron size silicon carbide particles
Data Source
AI summary
Organosilicon chemistry, polymer derived ceramic materials, and methods. Such materials and methods for making polysilocarb (SiOC) and Silicon Carbide (SiC) materials having 3-nines, 4-nines, 6-nines and greater purity. Processes for making SiC boules and SiC wafers utilizing such high purity SiOC and SiC.