Development Of Molybdenum-lanthanum Alloys And TZM Alloys For High-temperature Molybdenum
Molybdenum-lanthanum alloys, also known as high-temperature molybdenum, grade MoLa, are made of molybdenum doped with small amounts of lanthanum trioxide (La2O3) particles to form a so-called iterative fiber structure. This special microstructure remains stable at temperatures of up to 2000°C. As a result, molybdenum-lanthanum oxide is creep-resistant even under service conditions. We primarily process these molybdenum alloys into high-temperature furnace components such as vacuum furnace insulation screens, sintering and annealing boats, stranded wires or evaporator coils.
Advantages of molybdenum-lanthanum alloys.
Higher recrystallization temperatures.
Elongated particle structure for improved ductility.
Greater resistance to oxidation.
Higher creep resistance.
Recrystallization temperature: 1400℃~1500℃.
Resistivity of molybdenum-lanthanum alloy (unit: Ω*mm2/m)
Molybdenum-lanthanum alloy is an alloy consisting of base metal molybdenum and lanthanum trioxide, which is present in the matrix as a diffuse mass. The La2O3 content of the alloy is generally 0.5% to 5.0% by mass.
Molybdenum has excellent high-temperature strength, creep resistance, low coefficient of thermal expansion, good thermal conductivity and corrosion resistance, and is therefore widely used in the electronics industry, aerospace and military applications. However, molybdenum has a low recrystallization temperature, so the use of pure molybdenum is often limited. The recrystallization temperature of molybdenum is around 1,000°C. Once molybdenum recrystallizes, harmful impurity elements tend to enrich at the grain boundaries, thereby reducing the high-temperature and room-temperature properties of molybdenum. As with other metals, alloying is beneficial in improving the high-temperature properties of molybdenum. Alloying results in solid solution strengthening and second-phase strengthening of molybdenum alloys, resulting in improved alloy properties. The analysis of the high-temperature properties of the representative molybdenum alloys, lanthanum molybdenum and TZM, is important for the further development of molybdenum alloys.
Resistivity of molybdenum-lanthanum alloys (unit: Ω*mm2/m)
Molybdenum-lanthanum alloy composition
A few grains of molybdenum-lanthanum and TZM alloys recrystallize after annealing at 1100°C, and the number of recrystallized grains gradually increases as the annealing temperature increases. The difference with the recrystallization organization of pure molybdenum is that the recrystallized grains of molybdenum alloy show an elongated organization, while the recrystallized grains of pure molybdenum are equiaxed grains.
When the annealing temperature is less than 1400°C, the molybdenum-lanthanum alloy has strong strength and plasticity and other comprehensive properties. The tensile strength of the TZM alloy decreases with increasing temperature, but the plasticity increases, which is the opposite of the molybdenum-lanthanum alloy. In addition, a comprehensive comparison shows that the high temperature performance of TZM alloy is better than that of molybdenum-lanthanum alloy at the same temperature.
Molybdenum-lanthanum alloys exhibit a different thermal embrittlement than TZM alloys at annealing temperatures greater than 1400°C. This is mainly because, as the annealing temperature increases, the flow line organization of molybdenum-lanthanum alloy has a tendency to fracture. In contrast, the size, shape and distribution of the second phase of the TZM alloy do not change significantly in either the processed or recrystallized state.
Lanthanum molybdenum alloy target MoLa alloy magnetron sputtering material Electron beam coating evaporation material
Support customization of target materials, please provide the elements, ratio weight ratio or atomic ratio), specifications of target products.
Molybdenum-lanthanum alloy is an alloy consisting of base metal molybdenum and lanthanum trioxide which exists in the base as a diffuse mass. The La2O3 content of the alloy is generally 0.5% to 5.0% (mass fraction).
Molybdenum has a high melting point, excellent high-temperature properties, good electrical and thermal conductivity, and is an important high-temperature structural material. However, because of its relatively high plastic-brittle transition temperature, molybdenum used under high-temperature conditions (above the recrystallization temperature) is severely brittle when it returns to near room temperature. For this reason, researchers at home and abroad have conducted extensive research on the addition of rare earths to molybdenum, concluding that adding rare earths to molybdenum can refine the grain, reduce the plastic-brittle transition temperature of molybdenum, and increase the recrystallization temperature, high-temperature strength, improved toughness and plasticity, and high-temperature creep properties of molybdenum.
Target composition ratio, specifications, and purity can be customized on demand.
The product comes with packing list / quality inspection sheet / product is vacuum packed
Applicable instruments: Various types of magnetron sputtering, thermal evaporation, electron beam evaporation equipment
Quality control: Strictly control the production process, using a variety of detection methods such as glow discharge mass spectrometry GDMS or ICP spectrometry to analyze the content of impurity elements to ensure the high purity of the material and fine grain size
