Cerium Mischmetal
|
Cerium Mischmetal |
 |
Useful Physical Data |
|
| CERIUM | LANTHANUM | NEODYMIUM | PRASEODYMIUM | Cerium Mischmetal | |
| Specific Gravity | 6.81(HCP) 6.78(FCC) |
6.162(HCP) 6.19 (FCC) |
7.007 | 6.776 (HCP) 6.805 (FCC) |
6.68 |
| Melting Point ºC | 804+5 | 902+5 | 1024+5 | 635+5 | 884+5 |
| Boilint Point ºC | 3600 | 4515 | 3300 | 3450 | 3750 |
| Heat of
Fusion K Cal/mole |
2.2 | 2.4 | 2.6 | 2.4 | 2.3 |
| Electrical
restivity Michohm-cm |
75.3 | 56.8 | 70 | 75 | 70 |
| Heat of
Vaporization K Cal/mole |
79 | 81 | 69 | 79 | 78 |
| Thermal
Coef-exp. per ºC x 10-6 |
8.0 | 5.0 | 6.5 | 4.5 | 6.7 |
| Thermal
Conductivity C. g. s. units @28 ºC |
0.026 | 0.033 | 0.031 | 0.028 | 0.029 |
| Specific
heat Cal/mole/ ºC @ ºC |
6.89 | 6.65 | 7.20 | 6.45 | 6.86 |
| Thermal
Neutron Cross-section |
0.70+08 | 8.9+3 | 46+2 | 11.26+6 | - |
Note : This
propeties are computed on the basis of the following typical analysis :
52% Ce..24% Lan, 12% Nd, and 6% pr.
RECOMMENDED ADDITIONS OF CERALLOY
(Cerium Mischmetal) IN PRECISION CASTINGS
As per our experiment Per Cent Ceralloy (Cerium Mischmetal) to be added to Melt
| ALLOY | Composition | Section
thickness |
Ceralloy % |
Section
thickness |
Ceralloy | Section thickness |
Ceralloy |
| Carbon Steel | SAE 1015 thru |
1/16-1/8 | 0.15 0.2 |
1/8-1/4 " |
0.15 0.2 |
Over 1/4 " |
0.10 0.2 |
| Law alloy Steel (Low to Medium Carbon) |
SAE 2100 |
1/16-1/8 " " " " " " |
0.2 0.2 0.2 0.25 0.2 0.2 0.2 |
1/8-1/4 " " " " " " |
0.2 0.2 0.2 0.2 0.2 0.2 0.2 |
Over 1/4 " " " " " " |
0.15 0.15 0.15 0.15 0.15 0.15 0.15 |
| Cobalt-base Super Alloys |
Haynes |
1/16-1/8 " " " " " " " |
0.8 0.8 0.8 0.8 1.0 0.8 0.8 |
1/8-1/4 " " " " " " " " |
0.8 0.8 0.8 0.8 1.00 0.8 0.8 0.8 0.8 |
Over 1/4 " " " " " " " " |
0.6 0.6 0.6 0.6 0.8 0.6 0.6 0.6 0.6 |
| Stainless Steel | 300 series 400 series 200 series |
1/16-1/8 " " |
0.6 0.4 0.8 |
1/8-1/4 " " |
0.6 0.4 0.8 |
Over 1/4 " " |
0.6 0.3 0.6 |
| Hot work Tool Steels |
Cr-base types W-Base types Mo-base types |
1/16-1/8 " " |
1.0 1.2 1.2 |
1/8-1/4 " " |
1.0 1.2 1.2 |
Over 1/4 " " |
1.8 1.0 1.0 |
| Nickle-base Super Allpus |
Hastalloy Inconel Nimonic Udimet Unitemp K-42-B Rene 41 Inconel 700 Inconel 702 Waspalloy Astroloy |
1/16-1/8 " " " " " " " " " " |
0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.9 |
1/8-1/4 " " " " " " " " " " |
0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.9 |
Over 1/4 " " " " " " " " " " |
0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.6 0.7 |
| Aluminium | A1-Ou A1-Ou-Si A1-Si A1-Mg. (3-10% Mg.) |
1/16-1/8 " " " |
0.2 0.0 0.0 0.3 |
1/8-1/4 " " " |
0.2 0.0 0.0 0.3 |
Over 1/4 " " " |
0.1 0.0 0.0 0.2 |
| Copper Base Alloys |
Leaded Coppers Brasses or Bronzes Beryllium Copper |
1/16-1/8 " |
0.2 0.4 |
1/8-1/4 " |
0.2 0.4 |
Over 1/4 " |
0.2 0.3 |
| The values shown in per cent are the amounts of
Ceralloy (Cerium Mischmetal) to be added in each case to the respective molten metal prior
to casting and in accordance with the minimum section thickness of the castings. The
thinner the section, the higher the amount of Ceralloy necessary. The Recommended percentages given are only to improve fluidity for bettercastability, and are not necessarily the correct amounts to improve mechanical properties, although some improvement will be obtained in most cases. |
RAW FLINTS PVT.
LTD.
23/D, BHAKTINAGAR INDUSTRIAL ESTATE
RAJKOT -360 002 (GUJARAT) INDIA
PHONE : +91-281-2362686, 2362687, 2362688
FAX : +91-281-2362610
TELEGRAPH : RAWFLINTS
Email : rawflint@yahoo.com
