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High-purity silicon carbide powder
Silicon carbide (SiC) thermal spray powder boasts properties such as high hardness, high-temperature resistance, and corrosion resistance. Its applications span across multiple high-end industries, including industrial, metallurgical, chemical, electronic, and aerospace sectors.
Product Description
High-purity silicon carbide powder
Silicon carbide ( SiC thermal spray powder possesses characteristics such as high hardness, high-temperature resistance, and corrosion resistance. Its applications span across multiple high-end sectors, including industry, metallurgy, chemical engineering, electronics, and aerospace.
Here are its core performance characteristics and specific applications:
Core performance
- Hardness and Wear Resistance Its Vickers hardness reaches 2800–3200 HV, second only to that of diamond, and its wear rate under high-speed fluid erosion is more than 90% lower than that of metals.
- Corrosion resistance It is resistant to acidic and alkaline solutions (pH 1–14), saline solutions, and organic solvents; when immersed in concentrated sulfuric acid for one year, its mass loss is only 0.1%.
- High-temperature stability Low thermal expansion coefficient (4.7×10⁻⁶/℃), capable of withstanding high temperatures up to 1400℃ without cracking upon rapid heating or cooling.
- Antioxidant activity It begins to oxidize at 800℃ and forms a protective silica film at 1600℃, completely inhibiting further oxidation.
- Main uses
- Energy sector
For high-temperature components such as rocket nozzle exhaust nozzles and gas turbine blades, silicon carbide coatings can enhance the temperature resistance of these components. Above 1000℃, extend service life. - Industrial equipment
Used as a wear-resistant coating on turbine impellers, cylinder blocks, and other components to enhance wear resistance and extend equipment service life. - Chemical Engineering and Ocean Engineering
In acid-base neutralization equipment and seawater desalination units, silicon carbide coatings can withstand corrosion from strong acids and strong bases, ensuring the long-term stable operation of the equipment.
I. Core Performance of Silicon Carbide Powder
The properties of silicon carbide stem from its stable covalent-bond crystal structure and are primarily divided into two major categories: Black silicon carbide and Green silicon carbide The two have the same chemical composition, but their slightly different purities result in slight differences in performance.
|
Performance metrics |
Feature Description |
Comparison reference |
|
1. Extremely high hardness |
Mohs hardness up to 9.5 , second only to diamond ( 10 ) and cubic boron nitride ( cBN ). Green silicon carbide has a slightly higher hardness than black silicon carbide. |
It's corundum. Al ₂ O 3) Hardness of 2 More than double. |
|
2. Excellent wear resistance |
Its extremely high hardness endows it with outstanding resistance to abrasive wear and a long service life. |
It is one of the important wear-resistant materials. |
|
3. High strength and good heat resistance |
High strength at high temperatures, in 1600 ° C Its flexural strength at elevated temperatures is nearly the same as that at room temperature. It has high thermal conductivity and excellent thermal shock resistance (low thermal expansion coefficient). |
It can maintain stable shape and performance in high-temperature environments. |
|
4. Chemically resistant |
It exhibits excellent antioxidant properties and does not react with any acids, bases, or salts at room temperature. At high temperatures, it can react with certain strong oxidizing agents. |
Suitable for harsh chemical environments. |
|
5. Semiconductor performance |
Intrinsic silicon carbide is a semiconductor. Its bandgap width ( 2.2-3.3eV ) Much greater than silicon ( Yes ), and is therefore known as Wide-bandgap semiconductor materials 。 |
It boasts advantages such as a high breakdown electric field, a high saturated electron drift velocity, and high thermal conductivity. |
Green silicon carbide vs. Black silicon carbide:
* Green silicon carbide: Higher purity ( SiC Content >99% ), it has higher hardness but slightly greater brittleness. It is primarily used for machining hard and brittle materials such as cemented carbides, titanium alloys, and optical glass.
* Black silicon carbide: Lower purity ( SiC Content ~98.5% ), with slightly better toughness than green silicon carbide. It is primarily used for machining materials with lower tensile strength, such as cast iron, non-ferrous metals, stone, and refractory materials.
II. Main Applications of Silicon Carbide Powder
Its applications can be categorized according to processing form (powder, granules, products) and function.
(1) As an abrasive tool (the traditional and largest application area)
This is the most classic application of silicon carbide, leveraging its high hardness and wear resistance.
1. Coated abrasives: Manufacture sandpaper, sandcloth, and sanding belts for surface grinding and polishing of wood, metal, and plastics.
2. Bonded abrasive tools: Manufacture grinding wheels, grinding heads, and oilstones for grinding, cutting, and honing various metallic and non-metallic materials.
* Black silicon carbide: It is commonly used for grinding materials with lower strength, such as cast iron, aluminum, and copper.
* Green silicon carbide: It is commonly used for grinding hard and brittle materials such as cemented carbides, high-speed steel tools, glass, and ceramics.
3. Free Abrasive (Grinding Paste) / Liquid): Micron-sized silicon carbide is formulated into polishing pastes or added to grinding fluids for the polishing of precision components, such as semiconductor wafers, optical lenses, and gemstones.
(2) For use in refractory materials and metallurgical additives
Leveraging its characteristics of high-temperature resistance, erosion resistance, and excellent thermal stability.
1. Advanced refractory materials: When added to refractory bricks, ramming masses, and castables, it significantly enhances the high-temperature resistance, slag erosion resistance, wear resistance, and thermal strength of equipment such as kilns, blast furnaces, and ladles, thereby extending their service life.
2. Metallurgical additives:
* Steelmaking deoxidizer: In steelmaking, silicon carbide is an efficient deoxidizer that can replace traditional ferrosilicon, reducing oxygen content and improving steel quality.
* Cast iron inoculant: In the casting industry, adding silicon carbide can promote graphite nucleation, refine the graphite structure, and enhance the strength and performance of cast iron.
(3) For functional ceramics and structural ceramics
Silicon carbide powder is sintered—via processes such as reaction sintering, pressureless sintering, or hot-pressing—to produce dense ceramic products.
1. Sealing ring and bearing: Leveraging their high hardness, wear resistance, and corrosion resistance, these materials are used to manufacture mechanical sealing rings, sandblasting nozzles, bearing balls, and other components for demanding operating conditions (such as strong acids, strong bases, and high abrasion).
2. High-temperature kiln furniture: The supports, push plates, and saggers used in kiln construction feature strong load-bearing capacity, high-temperature resistance, and long service life.
3. Bulletproof armor: Silicon carbide ceramic tiles have high hardness and can be used to manufacture lightweight, highly efficient composite bulletproof armor.
4. Heat exchanger components: Its high thermal conductivity and high-temperature resistance make it suitable for high-temperature heat exchangers.
(4) For the semiconductor and electronics industries (core high-tech applications)
This is the highest-end application area for silicon carbide, leveraging its... Wide-bandgap semiconductor properties 。
1. Third-generation semiconductor substrate materials: High-purity silicon carbide powder is transferred via physical vapor transport ( PVT ) The law grows into Silicon carbide single-crystal ingot Then cut and polish to make it. Silicon carbide substrate (wafer) 。
2. Manufacturing electronic devices: Epitaxially grow thin films on silicon carbide substrates to fabricate high-performance power devices:
* Schottky diode ( SBD ): Fast switching speed and extremely high efficiency.
* Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) MOSFET ): High-voltage and high-temperature operation capability with low switching losses.
* Insulated Gate Bipolar Transistor (IGBT) IGBT ) Module: Silicon carbide-based IGBT Performance far exceeds that of traditional silicon-based materials.
- Application Advantages and Fields:
* High efficiency and energy saving: The device has extremely low energy loss.
* High-temperature work: Available in 200 ° C The above-mentioned stable environmental work (silicon devices typically... <150 ° C ).
* High-frequency operation: A high switching frequency can reduce the size of passive components in the system.
* Main applications: Electric drive systems and charging stations for new-energy vehicles; rail transit; smart grids; 5G Communication base stations; aerospace and aviation power systems, etc.
(5) Other uses
* Composite material reinforcement phase: Adding silicon carbide micropowder or whiskers to a metal matrix (such as an aluminum-based one) or a ceramic matrix can significantly enhance the strength, hardness, and wear resistance of the composite material.
* Wave-absorbing material: Used in military stealth technology to absorb radar waves.
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High-purity silicon carbide powder
Silicon carbide (SiC) thermal spray powder boasts properties such as high hardness, high-temperature resistance, and corrosion resistance. Its applications span across multiple high-end industries, including industrial, metallurgical, chemical, electronic, and aerospace sectors.
Product Description
High-purity silicon carbide powder
Silicon carbide ( SiC thermal spray powder possesses characteristics such as high hardness, high-temperature resistance, and corrosion resistance. Its applications span across multiple high-end sectors, including industry, metallurgy, chemical engineering, electronics, and aerospace.
Here are its core performance characteristics and specific applications:
Core performance
- Hardness and Wear Resistance Its Vickers hardness reaches 2800–3200 HV, second only to that of diamond, and its wear rate under high-speed fluid erosion is more than 90% lower than that of metals.
- Corrosion resistance It is resistant to acidic and alkaline solutions (pH 1–14), saline solutions, and organic solvents; when immersed in concentrated sulfuric acid for one year, its mass loss is only 0.1%.
- High-temperature stability Low thermal expansion coefficient (4.7×10⁻⁶/℃), capable of withstanding high temperatures up to 1400℃ without cracking upon rapid heating or cooling.
- Antioxidant activity It begins to oxidize at 800℃ and forms a protective silica film at 1600℃, completely inhibiting further oxidation.
- Main uses
- Energy sector
For high-temperature components such as rocket nozzle exhaust nozzles and gas turbine blades, silicon carbide coatings can enhance the temperature resistance of these components. Above 1000℃, extend service life. - Industrial equipment
Used as a wear-resistant coating on turbine impellers, cylinder blocks, and other components to enhance wear resistance and extend equipment service life. - Chemical Engineering and Ocean Engineering
In acid-base neutralization equipment and seawater desalination units, silicon carbide coatings can withstand corrosion from strong acids and strong bases, ensuring the long-term stable operation of the equipment.
I. Core Performance of Silicon Carbide Powder
The properties of silicon carbide stem from its stable covalent-bond crystal structure and are primarily divided into two major categories: Black silicon carbide and Green silicon carbide The two have the same chemical composition, but their slightly different purities result in slight differences in performance.
|
Performance metrics |
Feature Description |
Comparison reference |
|
1. Extremely high hardness |
Mohs hardness up to 9.5 , second only to diamond ( 10 ) and cubic boron nitride ( cBN ). Green silicon carbide has a slightly higher hardness than black silicon carbide. |
It's corundum. Al ₂ O 3) Hardness of 2 More than double. |
|
2. Excellent wear resistance |
Its extremely high hardness endows it with outstanding resistance to abrasive wear and a long service life. |
It is one of the important wear-resistant materials. |
|
3. High strength and good heat resistance |
High strength at high temperatures, in 1600 ° C Its flexural strength at elevated temperatures is nearly the same as that at room temperature. It has high thermal conductivity and excellent thermal shock resistance (low thermal expansion coefficient). |
It can maintain stable shape and performance in high-temperature environments. |
|
4. Chemically resistant |
It exhibits excellent antioxidant properties and does not react with any acids, bases, or salts at room temperature. At high temperatures, it can react with certain strong oxidizing agents. |
Suitable for harsh chemical environments. |
|
5. Semiconductor performance |
Intrinsic silicon carbide is a semiconductor. Its bandgap width ( 2.2-3.3eV ) Much greater than silicon ( Yes ), and is therefore known as Wide-bandgap semiconductor materials 。 |
It boasts advantages such as a high breakdown electric field, a high saturated electron drift velocity, and high thermal conductivity. |
Green silicon carbide vs. Black silicon carbide:
* Green silicon carbide: Higher purity ( SiC Content >99% ), it has higher hardness but slightly greater brittleness. It is primarily used for machining hard and brittle materials such as cemented carbides, titanium alloys, and optical glass.
* Black silicon carbide: Lower purity ( SiC Content ~98.5% ), with slightly better toughness than green silicon carbide. It is primarily used for machining materials with lower tensile strength, such as cast iron, non-ferrous metals, stone, and refractory materials.
II. Main Applications of Silicon Carbide Powder
Its applications can be categorized according to processing form (powder, granules, products) and function.
(1) As an abrasive tool (the traditional and largest application area)
This is the most classic application of silicon carbide, leveraging its high hardness and wear resistance.
1. Coated abrasives: Manufacture sandpaper, sandcloth, and sanding belts for surface grinding and polishing of wood, metal, and plastics.
2. Bonded abrasive tools: Manufacture grinding wheels, grinding heads, and oilstones for grinding, cutting, and honing various metallic and non-metallic materials.
* Black silicon carbide: It is commonly used for grinding materials with lower strength, such as cast iron, aluminum, and copper.
* Green silicon carbide: It is commonly used for grinding hard and brittle materials such as cemented carbides, high-speed steel tools, glass, and ceramics.
3. Free Abrasive (Grinding Paste) / Liquid): Micron-sized silicon carbide is formulated into polishing pastes or added to grinding fluids for the polishing of precision components, such as semiconductor wafers, optical lenses, and gemstones.
(2) For use in refractory materials and metallurgical additives
Leveraging its characteristics of high-temperature resistance, erosion resistance, and excellent thermal stability.
1. Advanced refractory materials: When added to refractory bricks, ramming masses, and castables, it significantly enhances the high-temperature resistance, slag erosion resistance, wear resistance, and thermal strength of equipment such as kilns, blast furnaces, and ladles, thereby extending their service life.
2. Metallurgical additives:
* Steelmaking deoxidizer: In steelmaking, silicon carbide is an efficient deoxidizer that can replace traditional ferrosilicon, reducing oxygen content and improving steel quality.
* Cast iron inoculant: In the casting industry, adding silicon carbide can promote graphite nucleation, refine the graphite structure, and enhance the strength and performance of cast iron.
(3) For functional ceramics and structural ceramics
Silicon carbide powder is sintered—via processes such as reaction sintering, pressureless sintering, or hot-pressing—to produce dense ceramic products.
1. Sealing ring and bearing: Leveraging their high hardness, wear resistance, and corrosion resistance, these materials are used to manufacture mechanical sealing rings, sandblasting nozzles, bearing balls, and other components for demanding operating conditions (such as strong acids, strong bases, and high abrasion).
2. High-temperature kiln furniture: The supports, push plates, and saggers used in kiln construction feature strong load-bearing capacity, high-temperature resistance, and long service life.
3. Bulletproof armor: Silicon carbide ceramic tiles have high hardness and can be used to manufacture lightweight, highly efficient composite bulletproof armor.
4. Heat exchanger components: Its high thermal conductivity and high-temperature resistance make it suitable for high-temperature heat exchangers.
(4) For the semiconductor and electronics industries (core high-tech applications)
This is the highest-end application area for silicon carbide, leveraging its... Wide-bandgap semiconductor properties 。
1. Third-generation semiconductor substrate materials: High-purity silicon carbide powder is transferred via physical vapor transport ( PVT ) The law grows into Silicon carbide single-crystal ingot Then cut and polish to make it. Silicon carbide substrate (wafer) 。
2. Manufacturing electronic devices: Epitaxially grow thin films on silicon carbide substrates to fabricate high-performance power devices:
* Schottky diode ( SBD ): Fast switching speed and extremely high efficiency.
* Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) MOSFET ): High-voltage and high-temperature operation capability with low switching losses.
* Insulated Gate Bipolar Transistor (IGBT) IGBT ) Module: Silicon carbide-based IGBT Performance far exceeds that of traditional silicon-based materials.
- Application Advantages and Fields:
* High efficiency and energy saving: The device has extremely low energy loss.
* High-temperature work: Available in 200 ° C The above-mentioned stable environmental work (silicon devices typically... <150 ° C ).
* High-frequency operation: A high switching frequency can reduce the size of passive components in the system.
* Main applications: Electric drive systems and charging stations for new-energy vehicles; rail transit; smart grids; 5G Communication base stations; aerospace and aviation power systems, etc.
(5) Other uses
* Composite material reinforcement phase: Adding silicon carbide micropowder or whiskers to a metal matrix (such as an aluminum-based one) or a ceramic matrix can significantly enhance the strength, hardness, and wear resistance of the composite material.
* Wave-absorbing material: Used in military stealth technology to absorb radar waves.
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