Aug 6 2013
Topics Covered
Introduction
Chemical Composition
Mechanical Properties
Fabrication
Machinability
Applications
Introduction
Molybdenum hafnium carbide (MHC) alloy is a particle-reinforced molybdenum alloy which contains hafnium and carbon. The carbon is uniformly distributed along the alloys structure giving it excellent heat and creep resistant properties at elevated temperatures of 1550°C (2822°F). This alloy is able to function under extreme mechanical and thermal loads.
This alloy is manufactured by the process of powder metallurgy. Some of the advantages that this alloy offers are dimensional stability, optimum non-deformability, high thermal stability, no cold brittleness, good hot ductility and very high crystallization temperatures.
This datasheet will look into the chemical composition, properties and applications of H.C.Starck MHC alloy.
Chemical Composition
The chemical composition of MHC alloy is given in the following table.
|
Element |
Content (%) |
|
Molybdenum, Mo |
≥98.43 |
|
Hafnium, Hf |
0.80-1.4 |
|
Carbon, C |
0.050-0.15 |
|
Iron, Fe |
≤0.010 |
|
Nickel, Ni |
≤0.0050 |
|
Silicon, Si |
≤0.0050 |
Mechanical Properties
The mechanical properties of MHC alloy are tabulated below.
|
Properties |
Metric |
Imperial |
|
Tensile strength(mid-radius) |
≥689 MPa |
≥100 ksi |
|
Yield strength(mid-radius) |
≥586 MPa |
≥85 ksi |
|
Elongation at Break (mid-radius) |
≥3% |
≥3% |
|
Hardness, Vickers |
≤34 |
≤34 |
Fabrication
Machinability
MHC alloy is best suited for machining processes such as drilling, lathing and grinding.
Applications
MHC alloy is used in the following applications:
-
Metal forming – making extrusion dies,
-
Extrusion of copper and copper alloys
-
Molten metal processing.