Kaist Ceramic sand advantage compare with other kinds of sand

Chemical composition comparison

Al2O3

SiO2

Fe2O3

TiO2

Fused Ceramic sand (black)

72.73%

19.67%

2.28%

1.34%

Cerabeads

60.53%

31.82%

2.07%

2.74%

Kaist Sintered Ceramic sand

57.27%

32.74%

2.73%

2.82%

Other Ceramic sand

52.78%

38.23%

2.49%

1.68%

calcined sand (silica sand)

3.44%

90.15%

0.22%

0.14%

Comparison of physical and chemical properties

Bulk density(g/cm3)

Refractoriness(℃))

Thermal expansion coefficient(20-1000℃)(10/℃)

Angular coefficient

Ignition loss(%)

Fused Ceramic sand (black)

1.83

>1800

<6

<1.06

<0.1

Cerabeads

1.72

1825

4.5-6.5

<1.15

<0.1

Kaist Sintered Ceramic sand

1.58

>1800

4.5-6.5

<1.1

<0.1

Other Ceramic sand

1.53

>1750

4.5-6.5

<1.15

<0.1

calcined sand (silica sand)

1.59

1450

20

<1.30

<0.1

Comparison of coated sand indexes of various sands

Hot tensile strength(MPa)

Tensile strength(MPa)

High temperature and pressure time(1000℃)(S)

Breathability

(Pa)

Bulk density(g/cm3)

Linear expansion rate(%)

Fused Ceramic sand (black)

2.1

7.3

55

140

1.79

0.08

 Cerabeads

1.8

6.2

105

140

1.68

0.10

Kaist Sintered Ceramic sand

2.0

6.6

115

140

1.58

0.09

Other Ceramic sand

1.8

5.9

100

140

1.52

0.12

calcined sand (silica sand)

2.0

4.8

62

120

1.57

1.09

Note: The resin model and the added amount are the same, and the raw sand is 70/140 model (around AFS65), and the same coating conditions.

Test of thermal reclamation

Fused Ceramic sand (black)

Cerabeads

Kaist Sintered Ceramic sand

Raw

sand

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image3

image4

10

Time

reclamed

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 image6

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The color gradually becomes lighter, darker, off-white and yellow; large particles have holes, and small powder particles have adhesion.

The color gradually becomes lighter and yellowish; there is no obvious change in appearance (only a hole is found in a large particle).

The color turns yellow after roasting, and there is no obvious change in appearance.

Based on the comparative analysis of the above test data, we draw the following conclusions:
①Fused Ceramic sand (black), Cerabeads, Kaist Sintered Ceramic sand, and other sintered ceramic sand are all aluminosilicate refractory materials. Compared with calcined sand (silica sand), it has the advantages of high refractoriness, low thermal expansion, small angular coefficient, and good air permeability. ;
②The bulk density of Kaist Sintered Ceramic sand is close to silica sand’s, which is much lighter than Fused Ceramic sand and Cerabeads. Under the same weight, the number of Kaist Sintered Ceramic sand used by customers to make cores is more than that of Fused Ceramic sand and Cerabeads;
③Through the comparison of Resin coated sand index, we found that Kaist Sintered Ceramic sand has the best comprehensive performance, second only to Fused Ceramic sand in strength performance, but the high temperature and pressure resistance time is more than twice that of Fused Ceramic sand, which is obviously effect in solving the problem of small core broken cores.
④The index of Resin coated sand of Kaist Sintered Ceramic sand is more obviously better than that of calcined sand (silica sand). The use of Kaist Sintered Ceramic sand under the same index can greatly reduce the amount of resin added, simplify the original Resin coated sand types, and help customers improve the production environment and production Site management;
Through the thermal reclamation test of Fused Ceramic sand, Cerabeads, and Kaist Ceramic sand, We found that the Fused Ceramic sand will have large pores and small particles bonding, which will lead to an increase in the amount of resin when re-coated, while Cerabeads and Kaist Ceramic sand are no obvious change in appearance, so they are more suitable for regeneration and recycling.


Post time: Dec-31-2021