Molybdenum tungsten alloy, molybdenum lanthanum alloy-High temperature alloy-Molybdenum alloy

Industrial properties of molybdenum (Molybdenum) #

Chemical symbol Mo, atomic number 42, density of about 10.23g/cm, is a transition metal element, for the human body and plants and animals necessary trace elements. Hard, high melting point (refractory) dense dark gray metal or black powder, insoluble in water. Used in the manufacture of structural alloys; used as a catalyst. Molybdenum dust and fumes can irritate the eyes and respiratory tract.

Some of the important industrial properties of molybdenum are: high melting point, high modulus of elasticity, low-temperature coefficient of linear expansion, good plasticity at low and room temperatures, heat resistance, high electrical and thermal conductivity, relatively small thermal neutron capture cross section, and a density close to half that of tungsten.

Some of the disadvantages of molybdenum as an industrial metal are its tendency to oxidize at temperatures higher than 500-700°C and its insufficient heat resistance for use at very high temperatures and under long load conditions. Molybdenum alloys (molybdenum-tungsten, molybdenum-lanthanum, etc.) suffer from the same problems, but do offer significant increases in recrystallization temperature, tensile strength, and creep resistance at elevated temperatures, e.g., through dispersion strengthening with lanthanum oxide, which improves heat resistance and improves malleability (lowering the brittleness threshold).

Common Uses for Molybdenum Alloys: #

1. Molybdenum-tungsten alloy MoW (Mo 70%, W 30%) powder metallurgical hot-rolled sheet; its recrystallization temperature is higher than that of molybdenum (up to 1200°C, deformation rate 90%) #

2. Molybdenum-tungsten alloy MoW-2-PM extruded and machined products, (up to 2100°C) for components operating in difficult, stressful environments #

   

3. Molybdenum-tungsten alloy crucible with 28-32% of tungsten. Molybdenum-tungsten alloys can also be strengthened with admixtures of B, Hf, Y, Zr, C #

   Crucible density:

   - Sintered MoW30 PM crucible-at least 10.9 g/cm3

   - Forged 30 PM crucible-at least 11.2 g/cm3

4. Molybdenum, tungsten and their alloy products for high-temperature furnaces #

   - Heating zones for melting quartz glass and growing sapphire monocrystals, uranium fuel annealing furnaces for the manufacture of fuel rods, and furnaces for the production of high-temperature heat exchangers, thermoelectric converters and other high-temperature operating equipment components

5. Molybdenum tungsten alloy MoW10 PM for sputtering target products #

   #

6. Molybdenum-Lanthanum #

   - ODS Mo as a more stable material for use at high temperatures (1600-1800°C and higher)
   - Mo-La material dispersions reinforced with lanthanum oxide have excellent creep resistance. The service life of screens and radiators is more than twice as long as that of pure molybdenum components. This material maintains its fiber structure during long-term operation at high temperatures. In addition, heat sink and screen assemblies made of 0.4-0.5 mm retain their plasticity in the recrystallized state at room temperature.
   

7. Copper-molybdenum-tungsten alloy #

   - Composites based on copper-infiltrated molybdenum-tungsten alloys exhibit tensile strength and resistance to gas erosion at high temperatures. They are suitable for the manufacture of parts operating at high temperatures and under dynamic loads.
   - The density of the raw material after sintered frame penetration is at least 11.0 g/cm³.

8. Tool blanks made of the molybdenum-yttrium promethium alloy Mo-Y-Pm #

   - Diffusion-reinforced deformed MoY-PM molybdenum alloys are used for the preparation of parts capable of operating at high temperatures for extended periods of time.
   - The microstructure of the product is monitored using an optical microscope, while ultrasound is used to check for internal defects.