Silicon Carbide

Take Your Business to the Next Level with Wholesale Silicon Carbide from Anyang Kongfang

As a professional Silicon Carbide supplier, our company was established in 2006 with more than 12 years of export experience. In the fierce market competition, our advantages are reflected in:

Strong Team

Our factory covers an area of about 30,000 square meters and currently has more than 140 employees, including more than 15 professional and technical personnel of various types. They can provide you with reliable technical support and considerate services in every aspect of cooperation.

Broad Market

Kongfang products are sold both domestically and abroad. It has exported ferro alloys to more than 20 countries such as Netherlands, Italy, South Korea, Japan, Russia, India, Turkey, Pakistan, Indonesia, Vietnam, Myanmar etc. thus earning a favorable reputation internationally.

Wide Product Range

Explore our extensive product range, featuring high-quality alloys and metals such as Ferro silicon, Silicon manganese, Silicon carbon alloy, Ferro chrome, Silicon metal, Ferro manganese, Silicon carbide, Calcium silicon, Nitrided Ferrosilicon, Silicon slag, Ferro silicon barium, Ferro boron, Manganese metal, Electrolytic manganese metal, and Calcium silicon cored wire etc. Our diverse selection ensures that we meet the diverse needs of our customers across various industries.

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Our professional sales team can provide first-class services in addition to 100% quality assurance for customers. We also provide good after-sales service to handle customer complaints and solve problems for customers. We will be responsible for any quality issues.

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Why the nitrided ferrochrome and low carbon ferrochrome look different

Brief Introduction to Silicon Carbide

Silicon carbide, exceedingly hard, synthetically produced crystalline compound of silicon and carbon. Its chemical formula is SiC. Since the late 19th century silicon carbide has been an important material for sandpapers, grinding wheels, and cutting tools. More recently, it has found application in refractory linings and heating elements for industrial furnaces, in wear-resistant parts for pumps and rocket engines, and in semiconducting substrates for light-emitting diodes.

Two Methods of Manufacturing Silicon Carbide

Lely Method
During this process, a granite crucible heats to a very high temperature, usually by way of induction, to sublimate silicon carbide powder. A graphite rod with lower temperature suspends in the gaseous mixture, which inherently allows the pure silicon carbide to deposit and form crystals.

Chemical Vapor Deposition
Alternatively, manufacturers grow cubic SiC using chemical vapor deposition, which is commonly used in carbon-based synthesis processes and used in the semiconductor industry. In this method, a specialized chemical blend of gases enters a vacuum environment and combines before depositing onto a substrate.

Ferro Chrome and Utilize of Ferro Chrome

Physical & Chemical Properties of Silicon Carbide

Physical Properties of Silicon Carbide

Odour: No odour
Appearance: Black grey to green powder, grey solid
Specific Density: 3.21 g/cm3
Solubility: Insoluble in water, alcohol, and acid.

Chemical Properties of Silicon Carbide

Electrical Properties: Due to its semiconducting properties, it has interesting electrical properties, with resistances varying by seven orders of magnitude for different components.
Resistance: Silicon carbide is resistant to most organic and inorganic acids, bases and salts in various concentrations, except for hydrofluoric acid and acid fluoride.

Features of Silicon Carbide

Robust Crystal Structure
Silicon carbide is composed of light elements, silicon (Si) and carbon (C). Its basic building block is a crystal of four carbon atoms forming a tetrahedron, covalently bonded to a single silicon atom at the centre. SiC also exhibits polymorphism as it exists in different phases and crystalline structures.

High Hardness

Silicon carbide has a Mohs hardness rating of 9, making it the hardest available material next to boron carbide (9.5) and diamond (10). It is this apparent property that makes SiC an excellent material choice for mechanical seals, bearings, and cutting tools.

High-Temperature Resistance

Silicon carbide's resistance to high temperature and thermal shock is the property that allows SiC to be used in the manufacturing of fire bricks and other refractory materials. The decomposition of silicon carbide starts at 2000°C.

Conductivity

If SiC is purified, its behaviour manifests that of an electrical insulator. However, by governing impurities, silicon carbides can exhibit the electrical properties of a semiconductor. For example, introducing varying amounts of aluminium by doping will yield a p-type semiconductor. Typically, an industrial-grade SiC has a purity of about 98 to 99.5%. Common impurities are aluminium, iron, oxygen, and free carbon.

Chemical Stability

Silicon carbide is a stable and chemically inert substance with high corrosion resistance even when exposed or boiled in acids (hydrochloric, sulphuric, or hydrofluoric acid) or bases (concentrated sodium hydroxides). It is found to react in chlorine, but only at a temperature of 900°C and above. Silicon carbide will start an oxidation reaction in the air when the temperature is at approximately 850°C to form SiO2.

Advantages of Silicon Carbide

Silicon carbide offers advantages for high temperature, high pressure and high power applications including:

Mechanical Strength

Silicon carbide has high wear resistance and high hardness, so it is widely used as a ceramic material in high temperature and wear-resistant applications in many industries.

Temperature Resistance

Silicon carbide has excellent high temperature resistance, low thermal expansion and high thermal consistency, and it is chemically inert at all temperatures.

Conductivity

Silicon carbide has variable conductivity, including semiconductor properties and non-linear resistance, so it is used in electronic circuit components because of its resistance to high voltages.

Fire Resistance

Silicon carbide is very fire-resistant, so it can be used to create sensors that detect flammable and combustible gases in harsh, high-temperature and corrosive environments. It is widely used as a refractory material in the production of steel, ceramics, non-ferrous metals, energy, chemicals, etc.

Uses of Silicon Carbide

Silicon carbide, also called carborundum, is a compound made from silicon and carbon. Its application cuts across a large number of industries.

Silicon Carbide Used in Military Bulletproof Armor

Silicon carbide is used to manufacture bulletproof armor. The property of this compound that makes it to be applied for such a purpose is its hardness. Bullets and other harmful objects will have to contend with the hard ceramic blocks that silicon carbide forms. Bullets can't penetrate the ceramic blocks.

Silicon Carbide Used in Semiconductors

Silicon carbide becomes a semiconductor when dopants are added to it. Dopants like boron and aluminum added to silicon carbide make it become a p-type semiconductor. On the other hand, dopants such as nitrogen and phosphorus added to silicon carbide make it become an n-type semiconductor. You can read this post for more information about the differences between p-type semiconductors & n-type semiconductors.

Silicon Carbide Used in Abrasives

Silicon carbide is commonly used as an abrasive because of how hard it is. It is used in the manufacture of grinding wheels, cutting tools, and sandpaper. Silicon carbide abrasives are usually cheaper than other abrasives of similar quality. The abrasives are used to grind materials such as steel, aluminum, cast iron, and rubber.

Silicon Carbide Used in Electric Vehicles

Silicon carbide is a better choice over silicon for powering electric vehicles. Electric vehicles powered by silicon carbide are highly efficient and cost-effective. At present, many well-known companies have used silicon carbide to improve efficiency and range when manufacturing electric vehicles, such as Tesla.

Silicon Carbide Used in Jewelry

Structurally similar to diamond, yet more lustrous, cheaper, more durable, and lighter than diamond, silicon carbide is a well-deserved alternative to diamond in the jewelry industry.

Silicon Carbide Used in Fuel

In addition to its other uses, silicon carbide is used as fuel. It is used as a fuel in steel manufacture and produces purer steel than most other fuels. It is also a cheaper and more environmentally-friendly fuel.

Silicon Carbide Used in LEDs

The first set of light-emitting diodes (LEDs) to be produced made use of silicon carbide technology. It was used to manufacture blue, red, and yellow LEDs. LEDs are used in televisions, display boards, and computers.

Silicon Carbide: Current Markets and Future

Developments

The extraordinary rise of the global silicon carbide (SiC) market is undoubtedly remarkable, with the automotive industry kicking off a shift from silicon to SiC for power semiconductor applications as early as 2017. As it enters the power electronics mainstream, does it run the risk of quickly becoming a commodity? The following is an overview of the existing silicon carbide market and simple predictions of future development:

Record Market Growth

According to the latest 2023 version of the power SiC report released by relevant agencies, the global power SiC device market is expected to grow to nearly US$9 billion by 2028, an increase of 31% from 2022. Automotive applications dominate the SiC market, accounting for 70%. Power SiC market by 2022 and various industrial applications including transportation, energy and telecommunications.

Global Investment Competition

Global chip manufacturers are paying close attention to the size transformation of SiC substrates. As some suppliers take the lead in launching 8-inch production capacity, other suppliers are also actively following suit and actively seeking to cooperate with major players in the upstream and downstream of the global supply chain to occupy a favorable position in the market. Global production capacity at the wafer level is growing rapidly with a raft of investment announcements.

Shifting Supply Chain Focus

New research highlights the changing focus on SiC supply chain bottlenecks. Massive capacity expansion does not simply mean oversupply. SiC wafer supply shortages in 2021 and 2022 will result in limited access to SiC wafers for many non-automotive applications, as electric vehicles have been a major driver of the SiC market. The SiC wafer capacity expansion will be put into operation in 2023, promoting the growth of the SiC device market. SiC wafers for MOSFET and automotive applications will be less affected by cost optimization. However, lower quality players will need to drop prices to gain remaining utilization. We expect higher price erosion for SiC diode-grade wafers. In the short to medium term, eight inches will be reserved primarily for interior use.

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FAQ

Q: Which are the applications of silicon carbide in electronic devices?

A: Silicon carbide is a semiconductor that is perfectly suited to power applications, thanks above all to its ability to withstand high voltages, up to ten times higher than those usable with silicon. Semiconductors based on silicon carbide offer higher thermal conductivity, higher electron mobility, and lower power losses. SiC diodes and transistors can also operate at higher frequencies and temperatures without compromising reliability. The main applications of SiC devices, such as Schottky diodes and FET/MOSFET transistors, include converters, inverters, power supplies, battery chargers and motor control systems.

Q: Why silicon carbide overcomes Si in power applications?

A: Despite being the most widely used semiconductor in electronics, silicon is beginning to show some limitations, especially in high-power applications. A relevant factor in these applications is the bandgap, or energy gap, offered by the semiconductor. When the bandgap is high, the electronics it uses can be smaller, run faster, and more reliably. It can also operate at higher temperatures, voltages, and frequencies than other semiconductors. While silicon has a bandgap of around 1.12eV, silicon carbide has a nearly three times greater value of around 3.26eV.

Q: Why silicon carbide can outperform IGBT at high frequencies?

A: In high-power applications, IGBTs and bipolar transistors have mostly been used in the past, with the aim of reducing the turn-on resistance that occurs at high breakdown voltages. These devices, however, offer significant switching losses, resulting in heat generation issues that limit their use at high frequencies. Using SiC, it is possible to make devices, such as Schottky barrier diodes and MOSFETs, which achieve high voltages, low turn-on resistance and fast operation.

Q: Which impurities are used to dope silicon carbide material?

A: In its pure form, silicon carbide behaves like an electrical insulator. With the controlled addition of impurities or dopants, SiC can behave like a semiconductor. A P-type semiconductor can be obtained by doping it with aluminum, boron, or gallium, while impurities of nitrogen and phosphorus give rise to a N-type semiconductor.

Q: How does silicon carbide semiconductor achieve better thermal management than silicon?

A: Silicon carbide has a thermal conductivity of 1490 W/m-K, while silicon has a thermal conductivity of 150 W/m-K. Thermal conductivity is an indicator of how well a semiconductor dissipates the heat it generates. If semiconductors cannot dissipate heat efficiently, there are limits to the maximum operating voltage and temperature a device can withstand.

Q: Why is silicon carbide (SiC) important?

A: WBG semiconductors such as silicon carbide (SiC) are growing in importance because they can significantly improve performance in a variety of applications compared to traditional silicon technologies while reducing the energy and physical space required to deliver that performance.

Q: How does Silicon Carbide (SiC) compare to Gallium Nitride (GaN)?

A: Compared to silicon that has a band-gap of 1.12 eV (electron-volts), GaN and SiC are compound semiconductors with band-gaps that are around three times higher at 3.39 eV and 3.26 eV respectively. This means that both can support higher voltages and higher frequencies, though there are a number of differences between the two technologies that impact how they work and where they are used.

Q: What are the main uses of silicon carbide?

A: Silicon carbide is a very popular abrasive in modern gemstone processing due to its durability and relatively low material cost. Therefore, it is vital to the art industry. In manufacturing, this compound is used for a variety of abrasive processing processes such as honing, grinding, waterjet cutting, and sandblasting due to its hardness.

Q: How hard is silicon carbide?

A: Silicon carbide forms an extremely hard ceramic substance, allowing it to be used in car brakes and clutches and in bulletproof vests. In addition to maintaining strength at temperatures up to 1400°C, this ceramic exhibits the highest corrosion resistance of all advanced ceramics.

Q: Is silicon carbide soluble in water?

A: Silicon carbide is insoluble in water. However, it is soluble in molten bases such as NaOH and KOH as well as molten iron. Silicon carbide can be thought of as an organosilicon compound.

Q: Is silicon carbide as hard as diamond?

A: Silicon carbide is hard, with a Mohs hardness of 9.5, second only to diamond, the hardest in the world. In addition, silicon carbide has excellent thermal conductivity. It is a semiconductor that resists oxidation at high temperatures.

Q: What are the difficulties in manufacturing silicon carbide?

A: Silicon carbide products are difficult to manufacture and require complex production processes such as high temperature and high pressure.

Q: Is silicon carbide expensive?

A: Silicon carbide is not a naturally occurring mineral, it must be produced in a furnace. These materials are more expensive than silicon.

Q: Which is stronger, aluminum oxide or silicon carbide?

A: Silicon carbide particles are sharper and harder than aluminum oxide particles, but silicon carbide is not as durable as aluminum oxide. Silicon carbide is best for non-metallic or low tensile strength materials, while aluminum oxide is best for high tensile strength materials.

Q: What is the difference between green silicon carbide and black silicon carbide?

A: The color difference is due to the purity of silicon carbide, with green SiC having higher purity.

Q: Is silicon carbide stronger than stainless steel?

A: Silicon carbide is more than four times harder than stainless steel.

Q: Where is silicon carbide mined?

A: Silicon carbide is produced by the carbothermal reduction of silicon dioxide to form an ultra-hard covalently bonded material. It is extremely rare in nature but can be found in the mineral moissanite.

Q: Which is harder, silicon carbide or tungsten carbide?

A: Silicon carbide seals are harder than tungsten carbide.

Q: What is black silicon carbide?

A: Black silicon carbide (SiC) is a semi-brittle abrasive commonly used in general abrasive applications such as fixed abrasives, grinding, polishing, tumbling, glass etching and sanding.

Q: What color is silicon carbide?

A: Silicon carbide appears as yellow to green to bluish-black, iridescent crystals.

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