실리콘 카바이드(SiC) 세라믹

Known since the late 19th century as carborundum silicon carbide ceramics (SiC), this compound of silicon and carbon has evolved from abrasive powders into a cornerstone material for high-performance engineering. Today, silicon carbide ceramics are indispensable in industries ranging from semiconductors and electronics to aerospace, automotive, energy, and chemical processing.

What is silicon carbide? In scientific terms, it is a covalently bonded silicon carbide compound with the chemical formula SiC, exhibiting a unique crystalline structure that can exist in different polytypes (3C, 4H, 6H). Its high hardness (Mohs 9.5), low density (~3.1 g/cm³), high melting temperature (~2,700 °C), and excellent silicon carbide thermal conductivity make it ideal for demanding applications where metals or plastics fail.

At Great Ceramic, we provide engineered silicon carbide parts tailored to customer requirements, offering unmatched precision, consistency, and reliability.

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장점 | 애플리케이션 | 재료 등급 | 속성 | 사례 | 가공 | 자주 묻는 질문 | 관련

실리콘 카바이드 세라믹-SIC-세라믹 재료-그레이트 세라믹

Advantages of Silicon Carbide Ceramics

The unique combination of mechanical, thermal, and electrical properties makes SiC stand out among technical ceramics.

With a Vickers hardness of around 22 GPa, silicon carbide hardness approaches that of diamond and cubic boron nitride. This makes SiC an ideal choice for wear-resistant parts, seal rings, and abrasives.

With silicon carbide density typically between 3.02–3.15 g/cm³, it offers exceptional strength without excessive weight—an important advantage in aerospace and automotive systems.

SiC thermal conductivity exceeds 100 W/m·K, making it an excellent material for heat exchangers, semiconductor wafers, and power electronics substrates.

A coefficient of thermal expansion (SiC CTE) of ~4 × 10⁻⁶/K ensures excellent dimensional stability, even under thermal shock and fluctuating temperatures.

Resistant to acids, salts, and most chemicals, while forming a protective SiO₂ film above 1,300 °C to resist oxidation.

The electrical properties of silicon carbide allow it to be used as a wide-bandgap semiconductor, ideal for high-power, high-temperature electronic devices.

Its combination of hardness, strength, and corrosion resistance means silicon carbide products significantly outperform metals and polymers in harsh environments.

산업 애플리케이션

Silicon carbide usage spans numerous industries thanks to its exceptional properties:

In aerospace, silicon carbide applications include turbine components, engine parts, and thermal protection systems. Its high-temperature capability and lightweight nature make it ideal for these demanding environments. Silicon carbide ceramics are also used in armor protection systems for vehicles and personnel due to their exceptional hardness and lightweight properties.

The semiconductor properties of SiC have revolutionized power electronics. Silicon carbide technology enables more efficient power conversion, higher frequency operation, and better thermal management compared to traditional silicon semiconductors. This makes it valuable for inverters, converters, and power supplies in energy applications.

In industrial settings, silicon carbide products such as nozzles, seals, bearings, and cutting tools provide exceptional wear resistance and longevity. The material's hardness and chemical inertness make it ideal for these demanding applications.

The automotive industry utilizes SiC for brake disks, clutch components, and ceramic filters. In electric vehicles, silicon carbide semiconductors are crucial for power control systems, improving efficiency and reducing heat generation.

In semiconductor manufacturing, silicon carbide ceramics are used for wafer processing fixtures, susceptors, and plasma-resistant components. The material's purity, thermal stability, and plasma resistance make it ideal for these critical applications.

Silicon carbide tubes, heat exchangers, and reaction chambers provide exceptional corrosion resistance in chemical processing environments. The material withstands aggressive acids, alkalis, and high temperatures where metals would rapidly degrade.

SiC's radiation resistance and stability at high temperatures make it suitable for nuclear applications, including fuel cladding and structural components in advanced reactor designs.

첨단 세라믹의 자동차 응용 분야
산업 기계에서 첨단 세라믹의 응용 분야
일반 제조 분야에서 첨단 세라믹의 응용
화학, 플라스틱 및 고무 분야에서 첨단 세라믹의 응용 분야
항공우주용 고급 세라믹 부품
반도체 및 전자 분야에서 첨단 세라믹의 응용 분야
의료 기기에 사용되는 테크니컬 세라믹
석유 및 가스 산업에서 첨단 세라믹의 응용 분야

Available grades of silicon carbide materials

Great Ceramic provides a range of high-performance silicon carbide materials optimized per application:

Pressureless Sintered Silicon Carbide Ceramics（SSIC）

Pressureless sintered silicon carbide ceramics (SSiC) are high-performance structural ceramics produced through a high-temperature, pressureless sintering process. Their primary component is high-purity silicon carbide powder. No metallic binder or external pressure is required during the sintering process, resulting in extremely high purity and density, resulting in excellent overall performance. This material is widely used in extremely harsh environments due to its exceptional mechanical strength, wear resistance, and corrosion resistance.

주요 기능

  • Ultra-High Hardness and Wear Resistance
  • With a Mohs hardness approaching 9.5, second only to diamond and cubic boron nitride, SSiC exhibits exceptional wear resistance, making it ideal for use in high-friction and high-wear environments.
  • Excellent Mechanical Strength: It possesses high flexural and compressive strengths, maintaining stable mechanical properties even at high temperatures.
  • High-Temperature Resistance: It can withstand long-term stable operation in air environments exceeding 1600°C and in inert atmospheres at temperatures exceeding 1600°C.
  • Excellent Corrosion Resistance: Excellent corrosion resistance to strong acids, bases, and most organic solvents, making it suitable for use in corrosive environments.
  • Excellent Thermal Performance: High thermal conductivity, low thermal expansion coefficient, excellent thermal shock resistance, and resistance to cracking due to sudden temperature changes.
  • High Purity and Insulation: The pressureless sintering process eliminates the introduction of metallic impurities, resulting in high material purity while maintaining excellent electrical insulation properties.

일반적인 애플리케이션

  • Mechanical Seals: Seal rings and bushings in pumps and compressors
  • Chemical Equipment: Corrosion-resistant pipes, nozzles, and valve linings
  • Semiconductor and Electronics Industries: High-temperature carriers, furnace tubes, and liners
  • Wear-resistant Components: Bearings, wear-resistant linings, and sandblasting nozzles
  • Energy and Environmental Protection: Furnace components in the photovoltaic industry, waste incinerator linings

생산 프로세스

Pressureless sintered silicon carbide ceramics are made from high-purity SiC powder, which is then formed into a mold with a small amount of sintering aid and pressurelessly sintered at temperatures exceeding 2000°C. This process gives the material a dense structure close to the theoretical density, with fine and uniform grains, thus ensuring excellent comprehensive performance.

Reaction-Sintered Silicon Carbide Ceramics (SISiC)

Reaction-Sintered Silicon Carbide Ceramics (SISiC) is a high-performance ceramic material made from silicon carbide (SiC) powder and a carbon source. Liquid silicon is infiltrated into a green body at high temperature, generating a reaction that produces new silicon carbide. Compared to pressureless-sintered silicon carbide (SSiC), SISiC boasts lower production temperatures and a more flexible process, enabling the fabrication of large-scale and complex-shaped structural components. Consequently, it enjoys widespread industrial application.

주요 기능

  • High Hardness and Wear Resistance: SISiC boasts excellent hardness (approximately 9 on the Mohs scale) and excellent wear resistance, making it suitable for friction and abrasion applications.
  • High Mechanical Strength: SISiC exhibits excellent flexural and compressive strength. Although lower than SSiC, it meets the requirements of most industrial applications.
  • Good Corrosion Resistance: SISiC is stable in most acidic and alkaline media and exhibits excellent oxidation resistance, making it suitable for use in the chemical industry.
  • Excellent Thermal Performance: SISiC exhibits a low coefficient of thermal expansion, high thermal conductivity, and excellent thermal shock resistance, enabling stable operation under high-temperature conditions.
  • Capable of Manufacturing Complex Structures: The reaction sintering process is capable of producing large, thin-walled components with complex geometries without the need for expensive hot pressing equipment.

일반적인 애플리케이션

  • Mechanical seals and pump components: seal rings, bushings, pump impellers
  • Chemical equipment: corrosion-resistant linings, valves, nozzles
  • Thermal equipment: kiln furniture, furnace linings, and supports
  • Energy: wear-resistant and corrosion-resistant components for wind, thermal, and nuclear power plants
  • Metallurgical industry: nozzles, channel linings, and sliding bearings

생산 프로세스

The preparation process of reaction-sintered silicon carbide typically involves:

  • Mix silicon carbide powder with a carbon source to form a green body;
  • Infiltrate liquid silicon at high temperature;
  • The liquid silicon reacts with carbon to form new silicon carbide, densifying the green body.

The advantages of this method include a simple process, low sintering temperature, and minimal dimensional shrinkage, enabling the production of large, complex components close to net dimensions. However, due to the presence of residual silicon, its high-temperature strength and oxidation resistance are slightly inferior to those of SSiC.

Key Properties of Silicon Carbide

Great Ceramic offers a variety of silicon carbide materials for customers to choose from. The following values are typical material properties and may vary depending on product configuration and manufacturing process. For more details, please feel free to 문의하기.

속성 단위 SSiC SiSiC Si3N4
색상 -- 짙은 회색 짙은 회색 회색 또는 검은색
밀도 g/cm³ 3.15 3.02 3.2
다공성 % ≤0.1 ≤0.1 --
경도 GPa 22 22 15
압축 강도 MPa 2600 2600 2500
굴곡 강도 MPa 400 250 700
탄성 계수 GPa 410 330 300
최대 사용 온도 ℃ 1400 1000 1100
열 전도성 W/(m・K) 100~120 45(1200℃) 15~20
열팽창 계수 1 x 10-6/°C 4 4.5 3

탄화규소 소재의 화학적 특성

산소 반응의 온도가 1300°C에 도달하면 탄화규소 결정 표면에 이산화규소의 보호 층이 형성됩니다. 보호 층이 두꺼워지면 내부 탄화 규소가 저항하고 계속 결합하여 탄화 규소 결정 실리콘 카바이드가 우수한 내 화학성을 갖도록합니다. 내식성 측면에서 SiC 재료는 이산화 규소 보호막의 역할로 인해 내산성이 강하지 만 내 알칼리성이 좋지 않습니다.

Silicon Carbide Ceramics Application Cases

Great Ceramic's silicon carbide (SiC) ceramics combine outstanding hardness, excellent thermal conductivity, superior wear resistance, and exceptional chemical stability, making them one of the most advanced ceramic materials for demanding industrial applications. With a high melting point, low thermal expansion, and ability to withstand extreme environments, silicon carbide ceramics are ideal for industries that require durability, efficiency, and long service life.

Key Applications of Silicon Carbide Ceramics:

  • Mechanical Seal Rings & Bearings
  • Aerospace Components
  • Silicon Carbide Crucibles
  • Semiconductor Wafer Carriers & Substrates
  • Automotive Components
  • Nuclear & Energy Applications
  • Abrasives & Cutting Tools (Carborundum)
  • Heat Exchangers & Tubes
  • Electronic & Electrical Insulators
  • Custom Precision Ceramic Parts
질화 붕소 세라믹 노즐
실리콘 카바이드 세라믹 메카니컬 씰 개스킷 링 1
질화 알루미늄 기판 레이저 절단
맞춤형 실리콘 카바이드 세라믹 임펠러
실리콘 카바이드 세라믹(SIC) 씰링 링
질화 알루미늄 세라믹 스페이서
표면 금속화 세라믹
실리콘 카바이드 세라믹 이너 슬리브-샌드 밀 안감

Silicon Carbide Ceramic Machining

Silicon carbide (SiC) ceramics are known for their extreme hardness, high thermal conductivity, and excellent wear resistance, making them one of the most challenging technical ceramics to process. At Great Ceramic, we provide comprehensive silicon carbide machining services that deliver industry-leading precision, performance, and reliability.

During machining, we employ advanced diamond grinding, precision lapping, and fine polishing techniques to achieve micron-level tolerances and exceptional surface finishes. These capabilities allow us to meet the stringent structural accuracy and surface quality requirements of mechanical seals, semiconductor substrates, crucibles, heat exchangers, and aerospace components.

With years of technical expertise and state-of-the-art equipment, Great Ceramic not only supplies standardized silicon carbide parts but also develops customized complex components tailored to specific industrial needs, ensuring high reliability and long service life under extreme working conditions.

정밀 세라믹 CNC 가공

CNC 연삭 및 밀링

미크론 수준의 공차로 CNC 밀링, 터닝 및 연삭.

세라믹 연마 및 연마

래핑 및 연마

매끄러운 마감과 광학 등급 표면을 위한 표면 연마.

기술 세라믹 레이저 커팅

세라믹 레이저 커팅

복잡한 형상을 위한 레이저 드릴링 및 절단.

세라믹 및 금속 브레이징 어셈블리

금속화 및 용접

세라믹 대 금속 브레이징을 위한 금속화(Mo/Mn, W).

자주 묻는 질문

실리콘 카바이드 (SiC) is a synthetic compound of silicon and carbon known for its exceptional hardness, thermal stability, and chemical resistance. It occurs in nature only rarely as the mineral moissanite but is widely produced for industrial applications. The silicon carbide definition encompasses both the simple compound and the advanced ceramic materials derived from it.

예, silicon carbide is a ceramic material—specifically an advanced technical ceramic. Unlike traditional clay-based ceramics, SiC is part of a class of materials known as "advanced," "engineering," or "technical" ceramics, which are characterized by their superior mechanical, thermal, and electrical properties.

Silicon carbide is used for a wide range of applications including abrasives, refractories, ceramic armor, semiconductor electronics, heating elements, and high-temperature components. Specific silicon carbide applications include mechanical seals, cutting tools, furnace components, power electronics, and wear-resistant parts in industrial equipment.

Silicon carbide is made through several processes. The traditional Acheson method involves heating silica sand and carbon in an electric furnace to temperatures above 2200°C. For higher purity materials, chemical vapor deposition (CVD) is used. To create solid silicon carbide ceramics, powders are formed into shapes and sintered at high temperatures (2000-2200°C) to achieve densification.

그리고 electrical properties of silicon carbide can vary widely. Pure SiC is an electrical semiconductor with a bandgap approximately three times wider than silicon. However, silicon carbide conductivity can be modified through doping with specific elements. Some grades can conduct electricity, while others are insulators. The conductivity of silicon carbide makes it valuable for electronic devices that operate at high temperatures, high frequencies, or high power levels.

실리콘 카바이드 is extremely hard, ranking 9.2-9.5 on the Mohs scale—just below diamond (10) and boron carbide (9.5+). Its hardness is approximately 2500-2800 kgf/mm² (Vickers), making it one of the hardest materials available commercially. This extreme hardness contributes to its excellent wear and abrasion resistance.

실리콘 카바이드 has high mechanical strength, with flexural strength typically ranging from 300-600 MPa. It maintains this strength at elevated temperatures—at 1400°C, it retains approximately 85% of its room temperature strength. The strength of silicon carbide, combined with its relatively low density, gives it an outstanding strength-to-weight ratio compared to metals and other ceramics.

그레이트 세라믹-첨단 세라믹-알루미늄 질화물 세라믹

질화 알루미늄

그레이트 세라믹-첨단 세라믹-질화규소 세라믹 2

질화규소

고급 세라믹 제조 전문가

Why Choose us for Silicon Carbide Ceramics?

에서 그레이트 세라믹, we are more than just a silicon carbide ceramics supplier — we are a precision engineering partner. Our strengths include:

  • Material Expertise – In-depth knowledge of SiC properties ensures optimal solutions.
  • Advanced Manufacturing – Precision grinding and polishing for micron-level accuracy.
  • Customization – From standard parts to complex components.
  • Quality Assurance – Strict testing for reliability and performance.
  • Global Reach – Trusted by industries worldwide.

Looking for high-performance silicon carbide ceramics that deliver strength, precision, and reliability?