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.

Molybdenum Crucible

-Standard: GB/T 17992-1999                                 

-Impurity content: <=0.03%

-Mo Content: >=99.95%

-Density: >9.8 g/cm3

-Working temperature: >1100°C

-Content Technique Density Size

-Mo >=99.95% Forging >=10.1g/cm3 (10-130mm) dia. x (10-2mm)

-Mo >=99.95% Sintering >=9.8g/cm3 (100-500mm) dia. x (50-700mm)

Molybdenum Crucibles

Most molybdenum crucible is produced by sintering pure molybdenum. The reason to use pure molybdenum as raw material is to prevent other metals melting in the molybdenum crucible from mingling impurities. Because molybdenum crucible has high-temperature resistance, low pollution and other excellent properties, molybdenum crucible is widely used in various industries. According to the required diameter, thickness, tilt angle, we can produce a various shapes and sizes of molybdenum crucible to meet your need.

Molybdenum crucible is a very important and essential tool in many industries. Molybdenum crucible can be used in smelting and rare earth metallurgy, mechanism process, electronics, artificial crystals, coating technology industries, such as: crystal materials, the sapphire growth, vacuum coating production, quartz glass melting furnace, smelting furnace and silicon crystal furnace and so on.

Molybdenum Crucible Applications

1、Description of Molybdenum Crucible
* Mo content: Over than 99.95%.
* Density: Over than 9.8g/cm3
* Diameter: 100-220 mm
* Height: 100-400 mm
* Temperature: 1100 C
Packing: Plastic inside and Wooden case outside

Molybdenum Crucibles

2、There are three technologies using in making molybdenum crucible, as following:
(1) pressing --> sintering --> tooling.
(2) pressing --> sintering --> forging --> tooling.
(3) sheets --> deep drawing --> tooling

3、Molybdenum Crucible Applications:
Molybdenum crucible is sintered or forged from the ultimate material—molybdenum powder. Generally speaking, molybdenum crucible is used pure molybdenum, for its purity can prevent melting metal powder from mingling. The density of molybdenum crucible is more than 9.8g/cm3, and its working temperature is among 1100℃. Therefore, it is another ring choice, besides tungsten crucible in metal melting industry.
Molybdenum crucible is widely used in metallurgical industry, rare earth industry, artificial crystal and machinery.
Molybdenum crucible is widely used in metallurgical industry, rare earth industry, artificial crystal, and machinery.

Molybdenum Crucible Applications

1.Description of Molybdenum Crucible

* Mo content: Over than 99.95%.
* Density: Over than 9.8g/cm3
* Diameter: 100-220 mm
* Height: 100-400 mm
* Temperature: 1100℃

Packing: Plastic inside and Wooden case outside

    Molybdenum Crucible

        Molybdenum Crucible

2.There are three technologies using in making molybdenum crucible, as following:

(1) pressing --> sintering --> tooling.
(2) pressing --> sintering --> forging --> tooling.
(3) sheets --> deep drawing --> tooling

3.Molybdenum Crucible Applications:

Molybdenum crucible is sintered or forged from the ultimate material——molybdenum powder. Generally speaking, molybdenum crucible is used pure molybdenum, for its purity can prevent melting metal powder from mingling. The density of molybdenum crucible is more than 9.8g/cm3, and its working temperature is among 1100℃. Therefore, it is another ring choice, besides tungsten crucible in metal melting industry.

Molybdenum crucible is widely used in metallurgical industry, rare earth industry, artificial crystal and machinery.