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CrO Content % International Standard Silicon Carbide Bricks for Industrial Furnaces

$Henan Hongtai Kiln Refractory Co.,Ltd.$

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CrO Content % International Standard Silicon Carbide Bricks for Industrial Furnaces

Country/Region	china
City & Province	zhengzhou henan
Categories	Earthwork Products

Product Details

Product Description

High Hardness high Wear resistant Silicon Carbide refractory Bricks

Silicon carbide brick is a refractory material made of SiC as the main raw material. Mohs hardness 9. It is more stable for acid slag. Containing SiC 72% ~ 99%. The bricks are divided into clay binding, Si3N4 binding, Sialon binding, -SIC binding, Si2ON2 binding and recrystallization. It is mainly used in retort, cast aluminum mold, electric furnace lining and heat exchanger, etc. 1. Clay bonded silicon carbide brick. Clay-bonded silicon carbide brick is a refractory product made of silicon carbide as the main raw material and clay as a binder. It is characterized by high thermal conductivity, low thermal expansion coefficient, good thermal shock resistance and wear resistance. It is the earliest developed type of silicon carbide bricks. Clay bonded silicon carbide bricks use black silicon carbide as the raw material. Its chemical composition: SiC 98.0%, free C 0.5%, Fe 0.2%, and free SiO2 0.6%. Soft clay and pulp waste liquid with good bonding properties are used as binders. In the past, the proportion of bonded clay used was relatively large, generally 10% to 15%, and now 3% clay and 5% pulp waste liquid are used. The thermal conductivity of silicon carbide bricks with a small amount of clay added is 3 to 4 times higher than that of silicon carbide bricks combined with more clay, and the load softening temperature and slag resistance are also higher. The manufacturing process of clay-bonded silicon carbide bricks with 3% bonded clay is to prepare coarse, medium and fine SiC according to the particle gradation that can obtain the maximum bulk density. Dry mixed uniformly first, then add clay, dry mixed for 3 minutes, add 4% pulp waste liquid (density 1.26~1.289/cm3), and mix. The water content of the mud is about 1.5%. After 12 hours of trapping, the mud is passed through a 4mm screen and formed by a brick press. The brick volume density is 2.5~2.79/cm3. Dry for 2 to 4 days under natural drying conditions and fire in a tunnel kiln at a firing temperature of 1400°C. The product is used as ceramic kiln furniture (shelf, support, sagger, etc.), muffle cover for muffle furnace, lining brick for aluminum refining furnace, distillation tank for zinc distillation furnace, cement rotary kiln cooler, etc. 2. Silicon nitride bonded silicon carbide brick Silicon nitride bonded silicon carbide brick is a refractory product made by nitriding and firing using SiC and Si powder as raw materials. Its characteristic is Si3N4 as the binding phase. Si3N4 exists between SiC crystal grains as needle-like or fibrous crystals, and is an important new refractory material. Using the principle of reaction sintering, the SiC green body containing silicon powder is sintered by the nitridation reaction, and the firing process is completed in a closed furnace with nitrogen gas and easy control. The temperature, pressure and atmosphere in the furnace must be strictly controlled. Main process parameters: nitriding gas pressure 0.02~0.04MPa, furnace atmosphere containing O2 less than 0.01%, final nitriding temperature 1350~1450℃, total nitriding time varies with product shape and size. Silicon nitride bonded silicon carbide bricks have good alkali corrosion resistance, molten cryolite wettability, oxidation resistance, wear resistance, high thermal conductivity, thermal shock resistance and extremely low electrical conductivity. Silicon nitride combined with silicon carbide bricks are mainly used as the lining of the lower furnace body of the blast furnace, which is more than twice as long as using traditional refractory materials. In addition, it can be used as the lining of aluminum reduction electrolytic cells and ceramic kiln furniture. It can also be used as a blast furnace tuyere water-cooled pipe sleeve brick because of its advantages such as environmental pollution. Silicon carbide Plates have high thermal conductivity, good wear resistance, thermal shock resistance, and corrosion resistance. Therefore, silicon carbide bricks are widely used in industry. It can be used for metallurgical steel cylinder lining, nozzle, plug, blast furnace bottom and hearth, heating furnace without water-cooled slide rail; non-ferrous metal smelting distiller, distillation tower tray, electrolytic tank side wall, smelting metal crucible; silicic acid Sheds and muffle materials for kilns in the salt industry; oil and gas generators and organic waste combustion furnaces in the chemical industry; kiln furniture for high-tech ceramics; aluminum electrolytic cell linings, molten aluminum pipes and kiln furniture for ceramic kilns, large and medium-sized blast furnaces Lower body, furnace waist and belly, aluminum refining furnace lining, zinc distillation tank lining, etc. The formula of coarse, medium and fine SiC should be 5:1:4. The raw material for making silicon carbide bricks is generally black SiC. Its chemical composition is as follows: SiC 98.0%, free C 0.5%, Fe 0.2%, and free SiO2 0.6%. Due to the different combination methods, there are differences in the process. The brief process of different combinations is: (1) Silicon nitride bonded silicon carbide brick: a green body formed with coarse, medium and fine silicon carbide particles and fine silicon powder, in pure N2 gas, at 1370 ℃, produces a kind of %26α-SiC as the skeleton and %26α and %26β-Si3N4. The substrate is silicon nitride bonded with silicon carbide bricks. There are still a small amount of residual silicon and SiO2N2 in the matrix in the product, and the relative content of these components varies with manufacturing plants. (2) Combining silicon carbide bricks: SiC, silicon powder, and carbon powder are mixed and shaped according to a certain ratio, and then fired in a reducing atmosphere at 1400°C. In most cases, buried charcoal firing is used. During the firing process, a %26β-Si3N4 bonded SiC brick with %26α-SiC as the framework and fine grain %26β-SiC as the matrix is produced. %26β-SiC is produced by the reaction of fine silicon powder and fine carbon powder during the firing process. This product also contains a small amount of residual silicon and carbon. (3)Silicon oxynitride combined with silicon carbide brick: When this kind of brick is compounded, the proportion of fine silicon powder is less than that of silicon carbide.

Features and Appliciation: Silicon nitride bonded silicon carbide bricks have good alkali corrosion resistance, molten cryolite wettability, oxidation resistance, wear resistance, high thermal conductivity, thermal shock resistance and extremely low electrical conductivity. Silicon nitride combined with silicon carbide bricks are mainly used as the lining of the lower furnace body of the blast furnace, which is more than twice as long as the use of traditional refractory materials. In addition, it can be used as the lining of aluminum reduction electrolyzers and ceramic kiln furniture, which can save energy, increase life It can also be used as a blast furnace tuyere water-cooled pipe sleeve brick because of its advantages such as environmental pollution.

Specification

High Hardness high Wear resistant Silicon Carbide refractory Bricks

Products name			silicon nitride bonded silicon carbide bricks
Apparent porosity %			≤17
Bulk density g/cm3			≥2.65
Cold crushing strength Mpa			≥160
Modulus rapture at room temperature			≥45
Modulus rapture at 1400℃ temperature			≥45
Coefficient of thermal liner expansion			≤4.18
Thermal cunductivity w/(m·k) (350℃)			≥16
Refractoriness℃			1800
Refractoriness Under Load 0.2Mpa			1600
Max working temperature			1550
Composition %	SiC	≥72
		Si3N4	≥20
		Fe2O3	≤0.3

Packing & Delivery

High Hardness high Wear resistant Silicon Carbide refractory Bricks

Packaging of Silicon Carbide refractory Bricks
1.on wooden pallets with plastic cover: wooden pallet size :930*930 or 1000*1000 mm,
2.Load weight of each pallet: 1.5-2.0 tons.

Shipping of Silicon Carbide refractory Bricks
1.Our packaging is as per customer’s request
2.Normal goods delivered by sea transport
3.Sample shipping by express
4.We will shipping and delivery goods timely, quality and quantity guaranteed, and also in accordance with the contract and customer's requirement completely.

Delivery:
15-30 days working day for large quantity. The shipment we will arrange as soon as possible. Of course, if it is a custom
products, the shipping time will delay.
Sample:
Usually by EMS, DHL, UPS, TNT, FedEx. Anyway you like. Bulk order: Usually by sea.
Payment:
It can be through T/T, L/C at sight. The specific terms determined according to the quantity of the goods, etc.
Your inquiry related to our product & price will be replied within 24 hours.
Export:
Our products have been exported to many countries: Australia, Chile, USA, Russia, UK, Indonesia, etc., good quality have be
approved by our clients.

Company Profile

High Hardness high Wear resistant Silicon Carbide refractory Bricks

Henan hongtai kiln refractory co., LTD. Is well aware that there are thousands of demands from customers, which can be summarized in four aspects: reliable quality, timely delivery, reasonable price and considerate service.The company will continue to adhere to the corporate spirit of "contributing to society and serving customers" and the business philosophy of "mutual benefit, win-win, integrity, efficiency, preciseness and responsibility".Our company is willing to develop a wide range of technical exchanges with colleges and universities and colleagues from all walks of life at home and abroad in a flexible and diversified way.

Henan HongTai kiln refractory co., LTD. Main products are high alumina brick, clay brick, silica brick, fused zirconium corundum brick, fireproof ball lightweight insulation brick, silicon carbide bricks, wear-resistant pouring material, corundum pouring material, low cement high strength pouring material, impermeable material, self-flowing material, plastic material, and various types of refractory materials.For different industries, the cement industry with anti-flaking high-alumina bricks, alkali resistant bricks, phosphate bricks;Boiler industry USES all kinds of brand wear-resisting brick, corundum brick, mullite brick and other finalizing materials.The company insists on "product quality is the life, enterprise integrity is the foundation", in the fierce market competition, won many users' trust and praise.The products are sold all over the country, as far as Vietnam, India,South Korea, Pakistan, Kazakhstan and other southeast Asian countries and regions.

Henan HongTai kiln refractory co., LTD. : "quality first, reputation first, customer first: it is our aim."Scientific management, strong technical force, perfect testing means, advanced technological equipment and stable product quality are the guarantee of quality service. Henan HongTai kiln refractories co., LTD sincerely hopes to cooperate with you hand in hand and in good faith.

Our Products

High Hardness high Wear resistant Silicon Carbide refractory Bricks

Why Choose Us

High Hardness high Wear resistant Silicon Carbide refractory Bricks

1.Strong professional:
Our company has thirty years producing experience in refractory products. Our manager will supervise on a various refractories production materials, process control, quality supervision and package delivery, and ensure the products are 100% qualified.
2.Annual supply:
Our company has passed ISO 9001 quality management system certification and SGS certification. And the annual supply of shaped and unshaped refractory product is 28, 800-35, 000 tons.
3.Export experiences:
Now we have gained a global sales network reaching Russia, South Korea, Vietnam, Pakistan, Bulgaria, France, India, Egypt, Congo, Angola, South Africa etc.
4. Production equipment:
Production and testing equipment are new, complete and automated or semi- automated. Such modern facilities and equipment have provided the fine technical guarantee for the production and testing.
5. Testing equipment:
Our company's testing equipment as follows:
High Temperature RUL. Tester
Bulk Density Tester
The Pressure Tester
Refractoriness Tester

FAQ

High Hardness high Wear resistant Silicon Carbide refractory Bricks

1. How can you control your quality?
For each production processing, we have complete QC system for the chemical composition and Physical properties. After production, all the goods will be tested, and The quality certificate will be shipped along with goods.
2. What's your delivery time?
It usually needs about 15 days- 30 days after receiving the deposit.
3.Do you have any experiences of export?
Yes,and Now we have gained a global sales network reaching Taiwan, Russia, Korea, Vietnam, Pakistan, Bulgaria, French, India, Congo, Angola, South Africa, and so on.
4. Do you provide free samples?
Yes, we can provide a free sample for testing, If we have sample in stock, The quantity based on the material type, The buyer should bear all the shipping costs.
5. Can we visit your Company?
Yes, certainly. You are very welcome to China and we will be honored to have a customer and friend.

Contact

Contact Us

Henan Hongtai Kiln Refractory Co.,Ltd.

CrO Content % International Standard Silicon Carbide Bricks for Industrial Furnaces

Product Details

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