Pressureless Sintered Silicon Carbide Ceramics

Your Professional Pressureless Sintered Silicon Carbide Ceramics Supplier

Superior Ceramics Times Technology Co., Ltd. is a manufacturer specializing in the production of advanced ceramic materials, including nitrides, oxides, carbides, and composite ceramics. Our product portfolio encompasses silicon carbide, aluminum nitride, alumina, ultrapure alumina, yttria, zirconia, high-purity and high-performance boron nitride ceramics, zirconia toughened alumina (ZTA), alumina toughened zirconia (ATZ), silicon nitride, as well as other reinforced, composite, and high-performance ceramic materials.

Advanced Production Technology

The company employs advanced manufacturing technologies, including sintering, molding, grinding, CNC machining, laser drilling, precision grinding, and polishing processes.

Complete Production Equipment

Key production equipment includes sintering furnaces, isostatic presses, grinders, engraving machines, laser cutters, double-sided grinding machines, sand wire cutting devices, and injection molding machines.

Professional R&D Team

Our team consists of experienced experts dedicated to researching advanced ceramic materials. To date, the team has published over 100 academic papers, filed five Chinese invention patents, and obtained more than 20 utility model patents.

Professional Service

The product has technical support from Ph.D. experts and other experts during the research and development stage. The process is rigorous during the production process, and the after-sales service is on call 24 hours a day.

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Parameter

Number	Performance	Unit	Boron Carbide Ceramics	Hot PressingsinteringBoron	Boroncarbide-02
			Boron Carbide Ceramics	Hot PressingsinteringBoron	Boroncarbide-02
			B4C-01	Hot-pressing B4C	B4C~02
1	Density	g/cm3	2.7	2.5	2
2	Flexural strength	MPa	450	600	100-200
3	Fracture toughness	MPa·m1/2	4	4.8	4
4	Dielectric constant	εr(20℃,1MHz)	4.8-8	4.8-8
5	Hardness	GPa	24	33	20
6	Hardness	HRC
7	Volume resistivity	Ω·cm(20℃)	10¹⁶	10¹⁶
8	Elastic modulus	GPa	380-400	390-430
9	Coefficient of thermal expansion	×10-6/k	5-9	2.3	1
10	Compressive strength	MPa	2500-5500	2200	800
11	Abrasions	g/cm2	0.01	0.05	0.02
12	Thermal conductivity	W/m×k(20℃)	20-40	37	16
13	Poisson's ratio	/	0.2	0.2	0.2
14	Insulation strength	kv/mm
15	Temperature	℃	2000	2000	2000
16	Melting point	℃	2750	2750	2750
17	Energy content		200-300
18	Ductility		0.0005-0.001	0.0005-0.001	0.0005-0.001
19	Elastic limit	MPa	250-550
20	Tensile strength		270-550
21	Pupose		Eulletpxoo fand Wear- xesistant	Eulletpxoo fand Wear- xesistant	Neutron shield

Advantages of Pressureless Sintered Silicon Carbide Ceramics

01/

High hardness
Its hardness is second only to diamond and cubic boron nitride, and it has excellent wear resistance. It can be used to manufacture mechanical seals, sandblasting nozzles, bulletproof parts, and other parts that require high hardness.

02/

High-temperature strength
It can be used reliably even at a high temperature of 1600℃ in the air, and is suitable for rollers, heat exchange tubes, square beams, kiln plates, and other parts in high-temperature kilns.

03/

Excellent thermal shock resistance
Due to its high thermal conductivity and small thermal expansion coefficient, it has excellent thermal shock resistance. Compared with other refractory materials, it can withstand rapid thermal cycles. For example, in equipment applications such as ceramic heat exchangers, they can withstand rapid changes in temperature without breaking.

04/

Low density
Compared with some other metal materials, the density of pressureless sintered silicon carbide products is low, which is conducive to reducing the overall weight of the equipment, and has more advantages in fields such as aerospace that have strict weight requirements.

05/

Strong corrosion resistance
It has stable chemical properties and has good resistance to corrosion by corrosive media such as acids, alkalis, and salts. In the chemical industry, it can be used to manufacture chemical pump seals, high-temperature ultra-thin kiln furniture, etc.

06/

Good electrical insulation
It is a good electrical insulation material and can be used to make insulating parts in the electronic and electrical fields.

Applications of Pressureless Sintered Silicon Carbide Ceramics

Manufacturing Industry

You can use these high-performance pressureless SSIC materials to produce seal rings, slide bearings, and tough wear-resistant parts in heavy industrial machines.

Glass industry

Materials made of glass, like windows, car windshields, side mirrors, and optical instruments, can all be made from pressureless sintered SiC material.

Electrical Industry

In today's electrical industry, you can use these SSIC ceramic materials to make semiconductors, weapons and arillery, high temperature power electronics and equipment due to their excellent compressive strength and ability to stand tough in unfavourable conditions.

Metallurgy Industry

You can use pressureless sintered silicon carbide in the production of metallic instruments and equipment that require quick transfer of heat or electrical conductivity. Materials such as ceramic heat sinks, combustion nozzles, kiln lining components, etc.

Production Process of Pressureless Sintered Silicon Carbide Ceramics

Raw Material Preparation

The main raw material is high-purity silicon carbide (SiC) powder. To improve density and mechanical properties, small amounts of additives such as boron carbide (B₄C) and alumina (Al₂O₃) are typically added.

Mixing and Grinding

The SiC powder and additives are mixed in specific proportions, followed by thorough grinding in a ball mill to achieve fine particle size and uniform distribution.

Shaping

The uniformly mixed powder is shaped into a green body using Cold Isostatic Pressing (CIP) or slip casting. Cold isostatic pressing helps to ensure the body is dense and uniform.

Drying

The shaped green body is placed in a drying chamber to remove excess moisture, preventing cracking during the sintering process.

Sintering

The dried body is sintered at high temperatures (typically 2100°C to 2200°C) in an inert gas or vacuum environment. In pressureless sintering, silicon carbide particles bond together without the application of external pressure, resulting in high-density, high-mechanical-strength SiC material.

Post-Processing

After sintering, the crucible may undergo additional processing steps such as precision machining, surface polishing, and quality inspection to ensure it meets the required specifications.

Customization Process

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Packaging and Shipping

Packaging	The package of our products usually includes bubble wrap, carton, pallet and wooden case, etc. Also it can be designed according to your demands.
Shipping	Shipping by sea, by air, by express are acceptable. According to your requirements.

Our Factory

Superior Ceramics Times Technology Co., Ltd. was established in 2005 and has several production plants in Taizhou, Shaoxing, etc. We also have a registered company in the United States, located at 10 ROBIN, IRVINE, CA 92604.

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Our Certificates

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FAQ

Q: What is pressureless sintering silicon carbide?

A: What is Pressureless Sintering? Pressureless sintered silicon carbide ceramics use high-purity, ultra-fine silicon carbide powder as raw material, add a small number of sintering aids, and sinter at a high temperature of 1950~2100°C in an inert gas or vacuum atmosphere at atmospheric pressure.

Q: What is the pressureless sintering process?

A: Pressureless sintering is a versatile bonding process used in many applications. Sintered joints offer excellent thermal and electrical conductivity and can withstand high temperatures over 175°C. It's also a lead-free alternative to traditional die-attach solders.

Q: At what temperature does silicon carbide sinter?

A: The typical sintering temperature for silicon carbide (SiC) is between 1900°C and 2200°C, depending on the specific process and desired properties. While some processes can be achieved at slightly lower temperatures (around 1700°C), achieving high density often requires temperatures within the higher end of that range.

Q: What happens when silicon carbide is heated?

A: Silicon carbide does not melt but begins to sublimate near 2,700 °C like graphite, having an appreciable vapor pressure near that temperature. It is also highly inert chemically, partly due to the formation of a thin passivated layer of SiO2.

Q: What are the principles of sintering?

A: Sintering is done in three phases. First, the metal powders are heated in the furnace at an appropriate temperature to create martensitic, crystalline structures. Then, the density of the metal powders' particles will be increased to combine and merge them all.

Q: What two process conditions are required for sintering?

A: The two basic elements for manufacturing a sintered component are: metallic powder, and tooling. Having them, the basic process to follow for producing a sintered part consists of three operations, i.e., powder mixing, compacting, and sintering.

As one of the most professional pressureless sintered silicon carbide ceramics manufacturers and suppliers, we're featured by quality products and good price. Please rest assured to buy high-grade pressureless sintered silicon carbide ceramics from our factory.

silicon carbide ceramic tube