SiC-Si Microparticle Composition for Oxygen and Fluorine Plasma Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fine particles, such as silicon/silicon carbide composite particles, lack sufficient plasma resistance, particularly when exposed to environments like oxygen and fluorine plasmas.
Innovation Solution
The production of fine particles comprising SiC and Si with a particle size not exceeding 80 nm, a weight loss ratio of not more than 9 mass%, and a hydrophilization degree of not more than 30% is achieved by supplying Si powder as a feedstock into a thermal plasma flame and using methane gas as a cooling gas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicon/silicon carbide composite fine particles are produced using conventional methods, then the particles can be formed, but they do not have sufficient plasma resistance
Solution Approach 1:
The patent changes the chemical composition parameters of the fine particles by incorporating specific amounts of silicon carbide (30-70 mass%) and silicon (30-70 mass%), along with controlled amounts of oxygen (0.1-5 mass%) and carbon (0.1-5 mass%). This parameter optimization resolves the contradiction by achieving both adequate particle formation and improved plasma resistance through precise compositional control.
Solution Approach 2:
The patent creates a composite fine particle system combining silicon carbide and silicon in specific ratios, with controlled oxygen and carbon content. This composite structure resolves the technical contradiction by leveraging the complementary properties of the materials: silicon carbide provides plasma resistance while silicon maintains structural integrity, achieving both particle formation capability and plasma resistance.
2Reliability
If the particle size is reduced to enhance plasma resistance, then plasma resistance improves, but manufacturing precision becomes more difficult to control
Solution Approach 1:
The patent optimizes the particle size parameter to a specific range (0.1-10 μm, preferably 0.3-3 μm) and controls the compositional parameters (silicon carbide 30-70 mass%, silicon 30-70 mass%, oxygen 0.1-5 mass%, carbon 0.1-5 mass%). This multi-parameter optimization resolves the contradiction by finding the optimal balance point where plasma resistance is maximized while manufacturing precision remains achievable.
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 resulting fine particles exhibit excellent resistance to both oxygen and fluorine plasmas, minimizing weight loss and maintaining structural integrity in plasma-exposed environments.
Implementation Method 1
supplying Si powder as a feedstock into a thermal plasma flame
Implementation Method 2
supplying cooling gas to the thermal plasma flame to thereby produce the fine particles, wherein the cooling gas includes methane gas
Data Source
AI summary
Microparticles having excellent plasma resistance a method for producing the same are provided. The microparticles include SiC and Si and have a particle size of not more than 80 nm, a weight loss ratio of not more than 9 mass %, and a hydrophilicity degree of not more than 30%.