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Composition and Blending of Enamel Ground Coat Frits

Composition and Blending of Enamel Ground Coat Frits

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  • Time of issue:2021-10-19
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(Summary description)The composition of the enamel ground coat is generally silica, feldspar, borax, soda ash, fluorspar, sodium nitrate, cobalt oxide, nickel oxide, manganese dioxide, calcium carbonate, etc.

Composition and Blending of Enamel Ground Coat Frits

(Summary description)The composition of the enamel ground coat is generally silica, feldspar, borax, soda ash, fluorspar, sodium nitrate, cobalt oxide, nickel oxide, manganese dioxide, calcium carbonate, etc.

  • Categories:Company news
  • Author:
  • Origin:
  • Time of issue:2021-10-19
  • Views:0
Information

The composition of the enamel ground coat is generally silica, feldspar, borax, soda ash, fluorspar, sodium nitrate, cobalt oxide, nickel oxide, manganese dioxide, calcium carbonate, etc.

Blending ratio of ground coat frit

 

1

2

3

4

5

6

7

8

Silica

32

12

42

16

24

29

19

23.8

Feldspar

20

36

8

28.5

29

22

29

32.4

Borax

25

26

21

29

21

30

32

23

Soda lime

14

15

15

14

15

5

9

14

Fluorspar

7

8

7

4.5

3

6

4.7

 

Sodium nitrate

2

2

5

3.5

3

4.6

5

4.3

Cobalt oxide

0.3

0.3

0.6

0.6

0.6

0.4

0.8

0.5

Nickel oxide

 

 

0.4

0.4

0.4

1

 

 

Manganese dioxide

 

 

1

 

 

2

0.5

2

Calcium carbonate

 

 

 

3.5

4

 

 

 

Total

100

100

100

100

100

100

100

100

According to the different firing conditions, the enamel ground coat frits in No. 3, 4, and 5 formulas in the table can be mixed and used in appropriate proportions. This kind of ground coat made by mixing several kinds of frit is called multi-frit ground coat (also called mixed ground coat), which can increase the firing range, promote the mechanical properties of the fired product, and its enamel slurry is easier control.

 

The total amount of silica, feldspar and borax in the ground coat frit is 80-85%. The ground coat containing more silica has higher firing temperature, less brightness, less firing range, strong mechanical properties, and scaly defects.

 

If the amount of feldspar is increased, the viscosity will increase during firing, the hardness will be high after firing, the mechanical properties will be strong, the surface will be bright and corrosion resistant.

 

When the content of borax increases, its firing temperature range is small, and it is easy to overfire and cause defects.

 

For the remaining raw materials, the amount of soda ash and saltpeter is between 10% and 20%. Excessive amount will cause the expansion coefficient to be too high. After firing, the surface will become acne and the mechanical strength will be reduced. Fluorite can increase its high-temperature fluidity in the ground coat containing cobalt oxide. The general use amount is between 3~8%. Excessive fluoride will cause acne on the surface after firing, which is easy to be corroded by acid. Poor fluidity, easy to cause copper spots.

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