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Vacuum
Induction Melting Technology
Advanced
Technical Scale Production Line Investment
Casting & Supplementary Materials
High Performance
Superalloy and Castings
Rare-earth
Magnet Alloy Ingot |
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| Investment Casting & Supplementary Materials | |||
Investment Casting |
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| ......BIAM's net-shaping investment casting technology makes the near size shaping of components possible with super dimension precision and position precision. The surface coarseness reaches Ra1.6m, which saves mechanical process costs greatly. The complicated large scale thin wall metal component that is hard to make by other method can be manufactured by investment casting. BIAM's advanced directional solidification casting and single crystal casting technology are used in producing better temperature resistance components with a longer service life under high temperature such as in aviation engine, aerospace engine, gas turbine blades, etc. The directionally solidified and single crystal superalloy casting exceed normal superalloy castings with a 25 ~ 50oC higher work temperature and a 2.5 ~ 5 times longer service life. | |||
 Fig.1 Cobalt-base alloy vance |
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 Fig.2 DS blades |
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 Fig.3 SC blades |
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Supplementary Materials for Net-shaping Investment Casting |
Table 1: Silica and
Alumina base ceramic core for preparation
of superalloy's complex hollow components.
| Type of ceramic core | XD-1 | AC-1 | AC-2 | |
| Density (g/cm3) | 25oC | 2.7 | 2.38 | 2.1 |
| Bending Strength (MPa) | 1500oC | 10 ~ 13 | 27 | 20 |
| 1550oC | 8.0 | 8.0 | - | |
| 1580oC | - | 6.9 | - | |
| - | - | 5.8 | 5 ~ 6 | |
| Fired Linear Shrinkage (%) | 0.6 ~ 0.8 | 1.5 | 0.4 ~ 0.6 | |
| Linear
Expansion Coefficient (1/oC) |
300 ~ 1550oC | 1 x 10-6 | 8 x 10-6 | 8 x 10-6 |
| Apparent Porosity (%) | 35 | 34 | 37 | |
| Application | Conventional | Directional solification and single crystal | ||
Table 2: Silica and
Alumina base ceramic core for preparation
of superalloy's complex hollow components.
| Type of shell mould | Conventional | DS | SC | DS/SC | |
| Bending strength (MPa) | 25oC | 7.5 | 6.7 | 11.2 | 20 |
| 1550oC | 0.5 | 1.1 | 5.0 | 2.5 | |
| Thickness (mm) | 5 ~ 7 | 5 ~ 7 | 5 ~ 7 | 5 ~ 7 | |
| Fire temperature (oC) | 900 | 900 | 900 | 1300 | |
| Preparation period (oC) | 3 ~ 4 | 3 ~ 4 | 3 ~ 4 | 12 | |
| Temperature capability (oC) | 1200 | 1550 | 1600 | 1550 | |
Table 3: High-quality wax for precision investment casting
|
Wax
|
Linear
shrinkage (%)
|
Bending
strength (MPa, 25oC)
|
Deformation
of cantilevered end at 32oC (mm)**
|
Drip
temperature
( oC ) |
Fluidity*
(mm)
|
Needle-press-deep
( 25oC, 100g, 5s) (0.1mm)
|
|
11
|
0.37
|
6
|
5
|
77
|
42.5
|
6
|
|
35
|
0.39
|
5
~ 6
|
5.5
|
60
|
65.6
|
5.8
|
| Comment: |
| * Spiral method: 3mm in Dia. And 1021mm in length, pouring at the temperature 10oC heigher than drip temperature, and the mold temperature is half of the drip temperature. |
| ** 100mm in length, 2mm in thickness, and 6mm in width. |
| ..... |
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