Refractory Prefabricated Parts for The Electronics Industry

Refractory Prefabricated Parts for The Electronics Industry

Refractory prefabricated parts for the electronics industry are a type of refractory material components with excellent performance and better quality control.‌
Prefabricated refractory parts are commonly used refractory materials for high-temperature equipment. Compared with traditional on-site masonry, they have many advantages. First of all, prefabricated refractory parts are cast or pressed on-site, and then dried or sintered and solidified in the factory before being transported to the site for installation. This production method ensures the consistency and controllability of product quality, thereby improving the quality of the project. There are many types of prefabricated refractory parts, which can be divided into high temperature resistant, acid and alkali corrosion resistant, wear resistant and other types according to different uses. Among them, high temperature resistant prefabricated refractory parts are the most widely used. For example, in tunnel kilns, refineries, metallurgical industry, glass industry, electric power industry and electronics industry, refractory prefabricated parts are needed for thermal insulation.
In the electronics industry, refractory prefabricated parts play a particularly important role. They can maintain good heat insulation, wear resistance, corrosion resistance and other characteristics in high temperature environments, effectively protect equipment, extend equipment life, and reduce equipment maintenance costs. Types of refractory prefabricated parts include but are not limited to refractory bricks, refractory boards, refractory balls, etc. These prefabricated parts have different shapes and sizes and can be selected and used according to the specific needs of the electronics industry.‌
In addition, the production process of refractory prefabricated parts is relatively simple, including batching, mixing, molding, curing, demoulding and drying. The main equipment used are mixers, vibrating tables, dryers, etc. In the production process, the amount of water added to the materials is strictly controlled to ensure the quality of the product. Although some refractory prefabricated parts can be used without being baked at a certain temperature, the baked prefabricated parts perform better in terms of service life and safety.
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Description
product-800-800

Corundum bricks have a true specific gravity of 3.5 g/cm3 or more up to 3.9 g/cm3, a refractoriness of up to 2000℃, and a load softening point of about 1800℃. They are representative of neutral refractory materials. Due to different production methods of corundum bricks, their performance varies greatly. Its electro-fused casting products will be introduced later, and here we will only talk about sintered products. There are two main categories of sintered products. One is products with electro-fused corundum sand as aggregate, and its binder is alumina powder and a very small amount of clay. This product has good thermal shock resistance when its porosity is large and there are many large particles.

For the casting molding of corundum products, in order to meet the needs of the casting process, silicon-aluminum composite binders A and B are prepared. It is a glue-suspension mixture, in which Al2O3:SiO2 (molar ratio) = 3:2, and a promoter for the formation of mullite is added. The differential thermal curves of the two binders are shown in Figure 3-3. The difference between the two binders is that binder A can form gibbsite (331°C peak) and boehmite sol (523°C peak) in water, and has better room temperature curing performance than binder B. Since Al2O3 and SiO2 in the two composite binders are highly active, we believe that the temperature at which the temperature of non-stoichiometric mullite formation starts to drop from 743°C and 704°C for binders B and A in the differential thermal curves of Figure 3-3, which can also be confirmed by thermodynamic calculations.

 

 

The corundum particles are closely connected by well-developed mullite. Since Al2O3 and SiO2 in the composite binder are extremely active, mullite can be quickly formed and well developed under the action of the promoter.

When the amount of silica fume added to corundum exceeds 2%, its high temperature resistance will be significantly reduced. For this reason, we selected a relatively pure ultrafine quartz powder with an average particle size of less than 18Hm and high purity, and added some promoters to promote the formation of mullite. The method of forming a mullite binding phase by reaction combustion has achieved obvious results.

There are several methods to combine mullite with corundum products and reduce the firing temperature of the products: one is to add kaolin (or combined with clay); after the kaolin decomposes, the more active Al2O3 and SiO2 can form a mullite binding phase at a lower temperature; the second is to add a substance that can form a certain liquid phase to promote the sintering of the product, and the last is to add SiO2 to form a mullite binding phase with Al2O3 in the product.

product-1337-800

 

Brand/Item

HX98

HX9O

HX80

HX75

HX75

HX65

HX90CS

HX90C

HX9OT

HX85T

HX70T

HX28

Al2O3 %

≥98

≥90

≥80

≥75

≥75

≥65

≥90

≥90

≥90

≥85

≥70

≥50

Fe2O3 %

≤0.3

≤0.5

≤0.5

≤0.6

≤1.8

≤2.0

≤0.3

≤0.3

≤0.3

≤0.4

≤0.5

≤0.5

ZrO2 %

                     

≥28

Apparent porosity %

≤22

≤20

≤18

≤20

≤19

≤21

≤18

≤20

≤16

≤16

≤17

≤20

Bulk density g/cm3

≥3.0

≥2.85

≥2.70

≥2.55

≥2.65

≥2.5

≥2.90

≥2.85

≥2.95

≥2.60

≥2.50

≥3.15

Normal temperature compressive strength Mpa

≥80

≥80

≥60

≥60

≥60

≥55

         

≥80

High temperature resistance Mpa

           

1500℃×0.5h

≥10

1450℃×0.5h

≥10

1500℃×0.5h

≥10

1450℃×0.5h

≥10

1400℃×0.5h

≥10

T2≥1620

Softening temperature under load KD ℃

≥1700

≥1650

≥1650

≥1700

≥1520

≥1500

≥1700

≥1700

≥1700

≥1700

≥1650

 

Reburning rate of change %

1600℃×2h

土0.1

1600℃×2h

-0.1~+0.3

1500℃×2h

-0.1~+0.1

1500℃×2h

±0.1

1500℃×2h

0~+0.3

1500℃×2h

0~+0.3

           

Thermal shock stability, times (1100℃ water cooling)

     

≥10

≥10

≥10

excellent

excellent

excellent

excellent

excellent

excellent

Application area

Furnace bottom

Slide rails

roof

Sidewall

Low-slip zone

Side walls, furnace top

Low-slip zone

Side walls, furnace top

High temperature

Connector plate

Low-medium temperature

Connector plate

High temperature push plate

Medium temperature push plate

Low temperature push plate

Supporting the vault

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