Silicon Carbide Powder Oxygen Removal via Hydrogen Cooling
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Solution Overview
Problem
The manufacturing of silicon carbide powder often results in residual oxygen, which interferes with the sintering process, reducing the density and efficiency of the silicon carbide sintered body.
Innovation Solution
A method involving the mixing of a silicon source with a solid carbon source or organic carbon compound, heating, cooling, and supplying hydrogen gas to reduce residual oxygen in the silicon carbide powder, followed by hot-pressing to form a high-density sintered body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional manufacturing schemes (Acheson, carbon-thermal reduction, liquid polymer thermal decomposition, or CVD) are used to produce silicon carbide powder, then silicon carbide powder can be manufactured with superior physical strength and chemical resistance, but residual oxygen is produced during reaction which interferes with sintering and reduces density and process efficiency
Solution Approach 1:
The patent applies preliminary action by performing oxygen removal through hydrogen gas treatment during the cooling phase, before the sintering process begins. This preliminary removal of residual oxygen prevents interference with subsequent sintering operations, allowing the silicon carbide powder to achieve high density and proper particle contact without oxygen-related defects.
Solution Approach 2:
The patent converts the harmful effect of residual oxygen into a benefit by using hydrogen gas to react with and remove the oxygen during cooling. The residual oxygen that would normally interfere with sintering is transformed through chemical reaction with hydrogen, eliminating the harmful effect and enabling high-quality sintered body production.
2Ease of manufacture
If conventional manufacturing schemes are used without additional oxygen removal processes, then production cost and process complexity remain low, but residual oxygen reduces density of silicon carbide sintered body and process efficiency
Solution Approach 1:
The patent merges the oxygen removal function with the existing cooling process by introducing hydrogen gas during cooling. Instead of adding a separate oxygen removal step, the cooling phase serves dual purposes: temperature reduction and oxygen removal through hydrogen reaction, thereby maintaining process simplicity while achieving high density sintered bodies.
Solution Approach 2:
The patent changes the chemical environment parameter during cooling by introducing hydrogen gas. This parameter change transforms the cooling phase from a purely thermal process to a chemical treatment process that removes oxygen, enabling high-density sintering without significantly increasing process complexity or cost.
3Productivity
If residual oxygen is not removed from silicon carbide powder, then additional processing steps and costs are avoided, but particle contact during sintering is interfered with, reducing process efficiency and yield rate
Solution Approach 1:
The patent performs preliminary oxygen removal during the cooling phase before sintering begins. By removing residual oxygen in advance through hydrogen gas treatment, the sintering process proceeds without oxygen interference, ensuring efficient particle contact and high yield rate without requiring additional dedicated oxygen removal steps.
Solution Approach 2:
The patent converts the harmful residual oxygen into a removable substance by introducing hydrogen gas during cooling. The oxygen that would normally reduce process efficiency and yield rate is chemically reacted and removed, transforming a productivity-limiting factor into a controllable parameter that enables efficient sintering.
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 effectively reduces residual oxygen in the silicon carbide powder, improving process efficiency and cost by facilitating better particle contact, resulting in a high-quality silicon carbide sintered body with enhanced density and compactness.
Implementation Method 1
supplying hydrogen gas into the mixture... hydrogen gas is supplied into a mixed raw material received in a crucible during a cooling process. Accordingly, an amount of the residual oxygen in the silicon carbide powder can be reduced.
Implementation Method 2
heating the mixture... mixing and heating source materials, such as a silicon source and a carbon source
Implementation Method 3
hot-pressing the silicon carbide powder... manufacture of a silicon carbide sintered body
Data Source
AI summary
A method for manufacturing a silicon carbide powder according to the embodiment includes forming a mixture by mixing a silicon (Si) source containing silicon with a solid carbon (C) source or a C source containing an organic carbon compound; heating the mixture; cooling the mixture; and supplying hydrogen gas into the mixture.