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Sintered Chrome Corundum Brick
Introductions
Chrome corundum brick mainly refers to the corundum refractory product containing Cr2O3. Using α-Al2O3 as main raw material, adding appropriate amount of chromium oxide powder and chromium corundum clinker fine powder, after forming process, the bricks will be sintered at temperature 1700℃. At high temperatures, Cr2O3 and Al2O3 form a continuous solid solution, so the high temperature performance of chromium corundum products is better than pure corundum products. In the most widely used chromium corundum products, the content of Cr2O3 is mostly in the range of 9%~15%. The main mineral composition is α- Al2O3•Cr2O3 spinel phase. The secondary mineral composition is a small amount of composite spinel (or no composite spinel). The chromium oxide content in the chrome refractory brick is from 1% to 30%. There are two types: fused cast chromium corundum bricks and sintered chromium corundum bricks.
As one kind of new top-grade refractory materials with high performance at high temperatures, it has high strength and strong erosion resistance, Chrome Corundum Brick is widely used for linings of high temperature furnaces or kilns in many industries of steel, building material, non-ferrous smelt, light industry and chemical industry.
Properties
Good wear resistance
Good thermal shock resistance
Good acid and alkali resistance
Good chemical stability
High fire resistance
Big intensity
Great high temperature performance
Strong Strength
Low Porosity
High refractoriness under load
Good chemical attack assistance
Chemical & Physical index:
Item |
Chrome Corundum Brick |
||||
XHJGGZ5 |
XHJGGZ12 |
XHJGGZ20 |
XHJGGZ30 |
||
Cr2O3 % |
υ≥ |
5 |
12 |
20 |
30 |
σ |
0.40 |
||||
Al2O3 % |
υ≥ |
88 |
81 |
73 |
63 |
σ |
0.6 |
||||
Bulk Density g/cm3 |
≥ |
3.10 |
3.20 |
3.40 |
3.50 |
Apparent Porosity % |
≤ |
18 |
18 |
18 |
18 |
Cold Crushing Strength MPa |
≥ |
100 |
100 |
100 |
100 |
Refractoriness Under Load ºC |
0.2MPa,0.6% ≥ |
1700 |
1700 |
1700 |
1700 |
* Only as optional index | |||||
Performances
Fire Resistance Property
Adding pure chromic oxide into high purity corundum materials, which will not reduce the fire resistance of materials, but can improve the materials’ fire resistance property. Chrome Corundum Brick’s refractoriness is over 1790℃ and refractoriness under load is over 1700℃, which are all higher than high purity corundum.Products Strength
High purity corundum brick’s cold crushing strength general is 70~100Mpa, high-performance chrome corundum brick’s cold crushing strength general is over 150Mpa, its strength is higher than corundum. Because in the firing process, all form the Al2O3 - Cr2O3 solid solution between particle and particle, particle and fines, fines and fines. This solid solution likes a bridge connect particle and fines, which enhance greatly the strength of materials.Thermal Shock Resistance
Adding pure chromic oxide into the corundum, normally Cr2O3 content is in the range of 1~30%, however, when the Cr2O3 content is about 10~66%, the material’s thermal shock resistance will reduce with the Cr2O3 content’s increasing. That is, when the Chrome Corundum Brick with a low level of Cr2O3content, its thermal shock resistance is better than the Chrome Corundum Brick with higher level Cr2O3 content.Slag Erosion Resistance
The solubility of Cr2O3 in the coal gasifier slag (SiO2~CaO) and all kinds of glass melt is much smaller than other oxides materials. So Cr2O3 or refractory materials with Cr2O3 has good corrosion resistance to steel slag, nonferrous metallurgy slag, coal gasifier slag and all kinds of glass melt. Liquid viscosity formed by Cr2O3 melt or Cr2O3 reacting with furnace slag is higher than other low melting materials’, which prevent that the molten slag infiltrate into brick interior along with the capillary pore and avoid the structure spalling caused of forming metamorphic layer.
Application
Chrome Corundum Bricks are mainly used in the linings in decomposing furnaces for petroleum and chemical industry, as well as the chemical fertilizer industry. They are also used as high temperature kiln linings and furnitures in metallurgical industry.
FAQ
Q1: re you a trading company or a manufacturer ?
A: We are a Manufacturer, our factory is located in Xinmi area of Zhengzhou City, Hennan, China, we can produce high quality refactory goods quickly with low prices.
Q2: How do you control the products quality?
A2: With strict quality control system throughout the materials selection and production process, our refractory and ceramic fiber products quality is effectively controlled to meet customer requirements.
From the raw materials selecting, our quality control begin. The quality certificates of raw materials are required and each batch will be tested before using. During production, the quality control is conducted by workers and then each piece will be sorted and examined by quality supervisor.
Q3: What`s the lead time for my order?
A3: It depends on customers' requirements and our production schedule. And usually we need 30-60 days for refractory bricks, 10-25 days for unshaped refractory materials and 10-20 days for ceramic fiber blankets.
Q4: Can you offer Door-to-Door delivery?
A4: Yes, but only for some countries such as U.S., UAE, Saudi Arabia, Iran, and Russia, etc.
Q5: What is the minimum quantity?
A5: There is no minimum order quantity. Depending on the item and processing, there may be a minimum production required, however we can offer a quotation based only on the quantity you need.
Q6: Can you give me a brief introduction of the application of your products?
A6: Our core refractory business comprises the production, sale and installation of high-grade refractory products, the development and implementation of customized system solutions as well as rendering outstanding services for the key industries in Glass, Iron& Steel, Petrochemical, Cement, Ceramic and Nonferrous Metals.
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