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Aluminum carbon bricks are aluminum carbon refractory materials. Rongsheng aluminum carbon bricks for Sale. Aluminum carbon refractory materials refer to carbon composite refractory materials made of alumina and carbon as raw materials, and in most cases, other raw materials such as SiC, metal Si, etc. are added, and bonded with organic binders such as asphalt or resin. Refractory bricks with alumina and carbon as the main components are called aluminum carbon bricks.

 

Aluminum Carbon Bricks Raw Material Composition in Rongsheng

 

Based on years of production and sales experience, Rongsheng Manufacturer have concluded that for refractory products under extremely harsh conditions such as long continuous casting time and high temperature, it is necessary to increase the Al2O3 content of the products and reduce the SiO2 content. Therefore, the granular materials in the ingredients of Rongsheng aluminum carbon bricks mainly include sintered corundum, fused corundum, sintered plate-shaped corundum (slide plate material), special grade and grade I alumina clinker. Select corundum fine powder or fused mullite, sintered synthetic mullite fine powder, or synthetic zirconium mullite fine powder.

Common binders for aluminum carbon bricks include resin, tar, asphalt, etc. Practice shows that the use of thermoplastic phenolic resin binder and urotropine hardener can generate insoluble and infusible solids, with high residual carbon content at high temperatures and excellent performance.

 

Physical and Chemical Indicators of Aluminum Carbon Bricks in Rongsheng

 

Physical and Chemical Indicators of Aluminum Carbon Bricks in Rongsheng
Items		Burned Aluminum Carbon Slider Bricks		Monoblock stopper	Ladle Shroud
Chemical Composition %	Al2O3 ≥	67	71	60	46
	F·C ≥	7	7	28	32
Apparent Porosity % ≤		8	8	13	16
Bulk Density g/cm3 ≥		2.7	2.8	2.6	2.7
Compressive Strength MPa ≥		79	89	25	27
Bending Strength at High Temperature, 1400℃×0.5h, MPa ≥		8	9	–	–
Bending Strength at Normal Temperature MPa ≥		–	–	8	9.2
Thermal Shock Resistance /times ≥		–	–	10	10
Application		＞ 50 tons Ladle Continuous Casting		–	–

 

Performance of Aluminum Carbon Bricks

 

Aluminum oxide has a high ability to resist the effects of acid, alkaline slag, metal, and glass solutions. It can achieve good results when used in an oxidizing atmosphere or a reducing atmosphere at high temperatures. Carbon raw materials, especially graphite, have high thermal conductivity and low linear expansion coefficient and are non-wettable with slag and high-temperature molten liquid. Therefore, Rongsheng aluminum carbon bricks have the following properties:

(1) Rongsheng aluminum carbon bricks have excellent slag resistance and thermal shock resistance. Compared with magnesium carbon refractories, aluminum carbon refractories have higher resistance to alkali (Na2O) erosion and TiO2 slag erosion.

(2) Rongsheng fired aluminum carbon bricks have a dual bonding system, namely carbon bonding and ceramic bonding. because the additive silicon reacts with carbon at high temperatures to form silicon carbide. Therefore, Rongsheng fired aluminum carbon bricks have high mechanical properties. In the continuous casting process, they not only act as traditional refractory materials but also are functional structural materials.

 

Rongsheng Aluminum Carbon Bricks Classification and Application

 

According to their different production processes, aluminum carbon bricks can be divided into two categories: unfired aluminum carbon bricks and fired aluminum carbon bricks.

Rongsheng unfired aluminum carbon bricks are carbon-bonded refractory materials, which have significantly better oxidation resistance than magnesia carbon bricks and excellent resistance to Na2O slag erosion. Therefore, they are widely used in molten iron pretreatment equipment such as blast furnaces and ladles. Rongsheng fired aluminum carbon bricks are ceramic-bonded refractory materials with high strength, good corrosion resistance, and thermal shock resistance. Therefore, they are widely used in sliding gate bricks (Slider Bricks) of sliding gate systems for continuous casting and three major parts of continuous casting, namely, long nozzle (Ladle shroud), sub-entry nozzle (Sub-entry nozzle), and monoblock stopper, etc.

Rongsheng unfired aluminum carbon bricks, commonly used raw materials are corundum, mullite, I and II high-alumina bauxite clinker, flake graphite, SiC, Si powder, etc. Compared with fired aluminum carbon refractory materials, unfired aluminum carbon refractory materials have the following characteristics: no need for firing, oil immersion and dry distillation heat treatment, and a simple production process. However, compared with fired aluminum carbon slide plates, the strength is lower and the porosity is higher.

 

Rongsheng Aluminum Carbon Brick for Sale

 

Aluminum Carbon Slider Bricks

Rongsheng Aluminum Carbon Slider Bricks are a functional refractory material for continuous casting, widely used in sliding nozzle systems such as electric furnaces, converters, refining ladles outside furnaces, and continuous casting tundishes. As a switch to control the flow and velocity of molten steel, Rongsheng Aluminum Carbon Slider Bricks have high-temperature strength, excellent corrosion resistance, erosion resistance, and thermal shock resistance. It also has high dimensional accuracy.

 

Aluminum Carbon Ladle Shroud

The Aluminum Carbon Ladle Shroud is usually installed when the ladle is moved above the tundish. In most cases, the Ladle Shroud Nozzle is directly connected to the ladle without preheating or insufficient preheating, which requires the Ladle Shroud to have excellent thermal shock resistance. Therefore, the Rongsheng Aluminum Carbon Ladle Shroud Nozzle has a high carbon content, generally 20% ~ 40%.

 

Aluminum Carbon Sub-Entry Nozzle

Aluminum Carbon Immersion Nozzle is a weak link in the continuous casting process, and its service life determines the continuous casting time and steel quality. Therefore, the role of the Sub-Entry Nozzle in the three major parts of continuous casting is very critical. The carbon content of the Rongsheng aluminum carbon Sub-Entry Nozzle is about 30%. The immersion nozzle must be preheated before use, so no cracks will occur during use. The erosion of the slag line and Al2O3 blockage are the two most fatal factors affecting the life of the Sub-Entry Nozzle.

 

Physical and Chemical Indicators of Aluminum Carbon Sub-Entry Nozzle in Rongsheng
Items		A	B	C	D	E	F	G	H
Chemical Composition %	Al2O3 ≥	47	58	50	–	–	BN/23	9	20
	ZrO2 ≥	–	2	–	75	78	24	63	52
	F·C+SiC ≥	28	38	24	21	18	15	27	27
	SiO2 ≤	23	–	23	–	–	Si3N4/26	–	–
Apparent Porosity % ≤		15	15	16	15	16	18	16	16
Bulk Density g/cm3 ≥		2.35	2.5	2.4	3.65	3.75	2.5	3.08	3.12
Flexural Strength MPa ≥		9.3	8.8	5.9	8.3	6.9	9.9	7.8	7.8
Elastic Modulus GPa ≥		9.8	9.3	8.3	9.3	8.8	7.8	8.8	8.8

 

Aluminum Carbon Monoblock Stopper

The use conditions of an Aluminum Carbon Monoblock Stopper are the same as those of a long nozzle. However, the Monoblock Stopper is preheated at the same time as the Sub-Entry Nozzle before use, so the problem of thermal shock resistance is generally not serious. The erosion resistance of the stopper rod head is the main reason for its damage. Rongsheng aluminum carbon Monoblock Stopper has been improved by adding additives, reducing critical particle size, controlling firing temperature, adding steel fiber, and other measures. The amount of C+SiC in the ingredients is generally around 30%.

Aluminum-Zirconium Carbon Bricks

Aluminum-zirconium carbon brick refers to an aluminum-carbon refractory material with a certain amount of ZrO2 added to the component, which is a type of carbon composite refractory material.

Rongsheng aluminum-zirconium carbon bricks, aluminum-zirconium carbon refractory material can meet the requirements of multi-furnace continuous casting in the continuous casting process, and solve the problem of aluminum-carbon refractory material with increased strength and decreased thermal shock resistance.

Therefore, Rongsheng manufacturers have found that the most effective way to improve the thermal shock resistance of aluminum-carbon refractory materials is to add zirconium mullite or AZTS (Al2O3-ZrO2-TiO2-SiO2) to the ingredients. Sometimes, in order to improve the slag resistance of aluminum-carbon brick products, desiliconized zirconium can also be added.

 

Physical and Chemical Indicators of Fired Aluminum Zirconium Carbon Slide Bricks in Rongsheng
Chemical Composition % ≥	Al2O3	70	65	75	62
	ZrO2	6	5	7	6
	F·C	7	7	7	8
Apparent Porosity % ≤		10	10	10	8
Bulk Density g/cm3 ≥		3.03	2.90	3.05	2.90
Compressive Strength MPa		118	100	120	120
Load Softening Temperature (T2) ℃ ≥		1700	1700	1700	1700
Application		Large steel ladle, tundish
Features		Good erosion resistance and thermal stability, can be used repeatedly

 

Rongsheng Aluminum Carbon Brick Manufacturer

 

Rongsheng is a powerful manufacturer and seller of refractory bricks. Rongsheng can provide the design, supply, and construction of lining materials for high-temperature industrial furnaces. Rongsheng’s aluminum carbon bricks and aluminum zirconium carbon bricks are of high quality and long service life. If you have a project that requires the purchase of aluminum carbon bricks, aluminum zirconium carbon bricks, aluminum zirconium carbon slider bricks, as well as slide bricks (Sliding gate bricks) for sliding gate systems for continuous casting and three major parts for continuous casting, namely, long shroud (Ladle shroud) sub-entry nozzle (Sub-entry nozzle) and monoblock stopper, etc. Please Contact Rongsheng, Email: sales@hy-refractory.com.