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Capital Refractories Limited

Crucibles

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Iso-Pressed

Capital Refractories is able to supply a full range of isostatically pressed crucibles from 2kg capacity to 75 kg, in different grades and qualities.

The advantages of Isostatically Pressed Crucibles are:
  1. Wide range of qualities.
  2. Wide range of crucibles sizes.
  3. Smooth internal surface giving a reduction of inclusions.
  4. Consistent material properties throughout crucible.
  5. Cost effective.
Capital Refractories is able to offer a range of vibration cast crucibles.
Quality
Description
Alumina General purpose crucibles with good resistance to acidic and basic slags. It is used for a wide range of alloys and stainless steels.
  AL97I Superior erosion resistance.
AL88I Improved thermal shock resistance.
Chrome-alumina Chrome-enriched crucible has a high resistance to slags. Preferred to alumina in more arduous applications.
CA93I Superior erosion resistance.
CA91I Specially formulated to withstand the most severe thermal shock applications.
CA84I Improved thermal shock resistance.
Magnesia High resistance to basic slags. Used in vacuum melting of Ni, Co and Fe-based alloys.
MG88I Used in vacuum melting of Ni, Co and Fe-based alloys.
MG95I Resistant to the special alloys used in semi-conductor and sputer target industries.
Mullite ML72I High thermal shock resistance. Resistant to basic slags.
Zircon ZN66I Good resistance to acidic slags. It is used for non-ferrous and precious metals.
Zirconia High resistance to acidic slags. Used in the vacuum melting of Superalloys and precious metals
  ZC93I General applications.
ZC95I High thermal shock resistance for noble metals.
ZC96I Fine grained structure for noble metals for noble metals.
ZM94I Magnesia-stabilised with enhanced thermal shock resistance for superalloys.
ZY97I Suitable fro cobalt & nickel superalloys.

Quality
Analysis / Wt. %
Al2O3
SiO2
MgO
CaO
Fe2O3
Cr2O3
ZrO2
Alumina AL97I
97.5
1.6
0.1
< 0.1
AL88I
88.5
2.2
0.1
0.2
Chrome-alumina CA93I
93.4
2.2
0.1
< 0.1
3.6
CA91I
91.5
2.2
0.1
<0.1
5.3
CA84I
84.3
9.0
0.1
0.2
4.8
Magnesia MG88I
3.5
3.8
88.0
3.8
0.2
MG95I
0.5
0.8
95.0
2.5
0.1
Mullite ML72I
71.8
25.7
0.2
0.5
Zircon ZN66I
0.8
32.5
0.2
0.1
66.6
Zironia ZC93I
0.8
1.2
4.0
0.1
93.0
ZC95I
1.0
1.5
3.8
<0.1
92.9
ZC96I
0.6
0.9
4.4
0.1
94.0
ZM94I
0.2
0.1
1.8
0.1
CeO2
3.9
93.5
ZY97I
0.7
0.2
1.8
0.2
Y2O3
3.6
94.7

Quality
Properties
Bulk Density
/ g cm-3
Apparent Porosity
/ %
Coefficient Thermal Expansion
/ MK-1
Thermal Conductivity
/ W m-1 K-1
Maximum Service Temperature
/ °C
Alumina AL97I
2.95
23.8
8.0
4.2
1600
AL88I
2.95
23.8
8.0
4.2
1600
Chrome-alumina CA93I
3.05
23.0
8.2
3.4
1800
CA91I
3.10
21.5
8.2
3.5
1800
CA84I
2.85
20.0
7.6
3.4
1800
Magnesia MG88I
2.85
17.0
14.5
2.4
1700
MG95I
2.95
15.0
13.0
2.5
1750
Mullite ML72I
2.43
21.5
4.2
1.8
1550
Zircon ZN66I
3.60
21.9
4.6
2.1
Zirconia ZC93I
4.35
20.0
8.4
1.5
1850
ZC95I
4.50
18.5
8.5
1.6
1850
ZC96I
4.50
18.5
8.5
1.6
1850
ZM94I
4.65
18.7
8.5
1.7
1850
ZY97I
4.37
24.7
8.5
1.6
1850

Capital also supply a range of associated ancillaries to complement the pressed crucibles.

Capital Refractories - The first name for quality

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