Improve English Level for Better Molybdenum Business

Hello!

Time flies. However I have worked in Chinatungsten for near two years and I realize that my English level need to be improved for I can have better understanding and exchange more smoothly with my molybdenum customers.

Well, recently, I find an interesting APP which called English Liulishuo. In this English learning APP, you can learn, speak and chat with different people from different areas. It likes a library has beginner to advanced-level topics that include business, travel, entertainment, kids and everyday conversations. You will never know the true value of a moment until it becomes a memory. It is never too late to learn.

I am becoming better and better, keep moving not only for the molybdenum customers but also myself.

Molybdenum Targets

Surface Condition of W/Mo Crucibles Has a Great Influence on Sapphire Growth

Saphhire

Do you know that the surface condition of molybdenum and tungsten crucible has a great influence on sapphire growth? Let us see the details in the following:

If the surface of the crucible is too rough, the sapphire cannot be released or can only be partially released from the wall of the crucible, which results in cracks and faults in the crystal. Not only that: The crucible itself is also damaged in the process and has to be reworked or replaced earlier than planned.

Our pressed-sintered crucibles made of tungsten or molybdenum has a surface roughness of less than 0.8 µm. The sapphire can be extracted from the crucible without difficulty and without damaging the surface of the crucible. For the sapphire producers, this results in fewer complexes and expensive reworking of the surface of the crucible. The cycles run smoothly and deliver high-quality ingots. And there's another advantage: The smooth surface is less susceptible to corrosion caused by the aggressive melted sapphire. This increases the service life of the reusable tungsten/molybdenum crucibles.

Crucible with Smooth Surface

Do you use molybdenum melting crucibles? We are glad to deliver these crucibles with ultra-smooth surface too. Talk to us!

Tungsten and Molybdenum Crucible Applied in Sapphire Production

Molybdenum Crucible

During sapphire production, Al2O3 - the compound that is to become the future single crystal - is melted in molybdenum crucible and tungsten crucibles. It is in the Kyropoulos process that our pressed-sintered crucibles show their strengths to best effect. They are repeatedly heated to more than 2 000 °C (3632 °F) and then cooled down again. This process, which would cause fissures and distortions in other materials, is not a problem for our tungsten and molybdenum products.

With our many years of experience in the field of powder metallurgy, we produce crucibles of a particularly high density and purity. By correctly filling the mold used for the crucible and carefully controlling the temperature distribution during sintering, we achieve uniform wall and base thicknesses - an important prerequisite in achieving the high level of creep resistance that characterizes our crucibles.

If you are interested in such a crucible, please feel free to contact us.

Tungsten and Molybdenum with Sapphire

For the past 15 years single crystal sapphire has been at the cutting edge of semiconductor technology.

A combination of unique chemical, physical, optical and mechanical properties make sapphire the best choice for a broad spectrum.

•  Chemical resistance.
Sapphire is highly inert and resistant to attack in most process environments including hydrofluoric acid and the fluorine plasma applications commonly found in semiconductor wafer processing (NF3, CF4).

• Mechanical properties.
Sapphire is characterized by high toughness and solidity, and demonstrates excellent resistance in different environments ranging from cryogenic to over 1500°C. Due to this characteristics combined with chemical stability sapphire is widely used in medicine: endoscope and probe lenses, needles for thermal treatment of tumors, scalpels etc.

• Electrical properties.
Sapphire provides a high, stable dielectric constant with the electrical insulation required for LED, RF and microwave applications.

• Optical transmission.
Sapphire is characterized by high transmission in the range of UV to near IR. Given the chemical stability, high temperature and high pressure resistance sapphire is the preferred choice for window / viewport applications in high performance vacuum systems, furnaces, deep sea cameras, fire alarm systems etc.

• Surface properties.
Sapphire can be polished to very high flatness and smoothness for substrate applications and precision mechanical components.

• Thermal properties.
With a melting point over 2000°C, and high thermal conductivity sapphire is often used in many harsh process environments.

• Wear properties.
With high hardness and transparency, sapphire is used for scratch proof windows in high wear applications and for precision mechanical components.

If you want know more details about sapphire, please click the following link: www.tungsten-molybdenum-sapphire.com.

Tungsten and molybdenum is the most widely used material in the production of sapphire as for their excellent properties. If you are in producing sapphire, please feel free to contact us for the quotation of there two materials.