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Name: Frank Wang
Tel: 0086-518-82326257
Fax: 0086-518-82326257
E-mail: minerals@chemsize.com
Add: Haikeyinzhou, Haitang Bei Lu 89#,Lianyun District,Lianyungang,Jiangsu,China
Skype: renai11
Skype: renai11

 
      Investment casting, also known as Precision casting or lost-wax process, is used to make precision products for the industiry of machine,automotive, military, aerospace, medical, commercial, and recreational.

      Most investment casting foundries use Zircon Flour for making the primary slurry. Zircon continues to be in short supply and the prices are rising. Many clients use the Fused Silica sand,used silica powder,fused silica grains,fused silica flour in  the dipping and coasting process to make primary slurry and rainfall sander to form a hard shell because of the following advantages:

1) Fused silica decrease in material consumption
       Fused Silica's density is 2.21g/cm3,just roughly half of Zircon's density. If Zircon flour is replace 20% in primary slurry batch with Fused Silica, it needs lesser material by weight. For example if  slurry mix had 50 kgs of Zircon and try and replace 10 kgs then it would need to add around 6 kgs of Fused Silica flour to achieve the existing viscosities and flow properties.

2) Fused silica increase permeability and porosity
       Zircon is very dense. Fused Silica is lighter and does not pack as tightly as Zircon which is why it helps in improving the permeability of your shell. It is also more porous.

3) fused slica ceramic shell is Easier knock-out
       Fused Silica knocks out much easier than Zircon or Alumino-Silicates. This is because of the Cristobalite formation while pouring which easily breaks down upon cooling.

4) Faster leaching and shell removal
        the moment to add fused silica in the shell it helps in the leaching process and it is much easier to remove shell materials off cavities and holes.

5) Fused Silica price is cheaper.

The typical specification sheet of Chem&Size minerals Fused Silica sand,fused silica grains and fused silica powder and fused silica flours for your perusal.
For PDF documetns,please download:
Fused Silica--Investment Casting Grade.pdf 

1

Physical Properties

1.1

Composition

SiO2

1.2

Structure

Amorphous

1.3

Colour

Transparent or white

1.4

Melting Temperature

approx.1750

1.5

Specific Gravity

2.21g/cm3

1.6

Hardness

7 Mohs

1.7

Thermal Expansion

0.5*10-6

2

 

 Chemical Properties

 

 

Investment Casting Grade

2.1

SiO2

>99.90%

2.2

Al2O3

<200ppm

The finer the power,the higher the Al2O3,as powder is produced by ball mill with Alumina ball.

2.3

Fe2O3

<50ppm

2.4

TiO2

<20ppm

2.5

MgO

<40ppm

2.6

CaO

<40ppm

2.7

Alkalies

Na2O+K2O

<100ppm

 3.   Particle Size   Distribution  

 

 

 

 

 

 

10/20mesh

20/50mesh

30/50mesh

50/100mesh

-100mesh

-200mesh

-325mesh

Mesh

Microns

 

 

 

 

 

 

 

8

2360

<2

 

 

 

 

 

 

12

1700

6-25

 

 

 

 

 

 

16

1180

33-50

 

 

 

 

 

 

20

850

25-45

<1

<1

 

 

 

 

30

600

13

25-40

15-30

 

 

 

 

40

425

 

32-45

38-50

 

 

 

 

50

300

 

15-30

20-35

<13

 

 

 

70

212

 

 

 

30-60

 

 

 

80

180

 

0-11

<10

 

 

<1

 

100

150

 

 

 

28-51

<15

<1

 

140

106

 

 

 

4-16

17-40

<10

 

200

75

 

 

 

<2

19-34

<10

<3

325

45

 

 

 

 

14-30

15-30

4-11

Pan

 

<3

<2

<2

<1

4-20

70-80

86-97  

*Pan designates the percentage of fused silica passing the last reported screen for each size.

4.    Dust Removal

        investment casting grade fused silica is treated by dust removal equipment, so that this grade fused silica dust is in the lowest level.

The difference between common grade fused silica and investment grade fused silica.

4.1 Non Dust Removal fused silica              4.2.Dust Removed fused silica for Investment Casting

     

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