Molybdenum Evaporation Boat

Molybdenum evaporation boat is high-melting-point, heat-resistant containers made of molybdenum, mainly used in vacuum evaporation processes to carry and heat various coating materials for thin film manufacturing in semiconductor, electronic, and optical industries. These evaporation boats have a groove or depression to hold the evaporant, enabling controlled deposition onto substrates under vacuum conditions.

Molybdenum boats are typically made of high-purity molybdenum (above 99.95%) or molybdenum alloys. They are usually in the shape of rectangular or elliptical plates, with a groove in the middle for holding the evaporant and larger flat or raised surfaces at both ends for connecting electrodes and conducting current. They are key components in vacuum coating processes.

Molybdenum is a refractory metal with an extremely high melting point (about 2620°C), ensuring that the evaporation boats do not melt or deform in high-temperature working environments. Additionally, molybdenum has good high-temperature strength and a low vapor pressure, meaning it is less likely to volatilize and contaminate the coating at high temperatures.

Molybdenum Boat Function:

In a high vacuum environment, by applying a powerful current, it can instantly reach an extremely high temperature (up to over 1700℃), thereby melting and vaporizing the coating materials placed inside or on its surface (such as aluminum wire, zinc sulfide, etc.) into gaseous molecules. These gaseous molecules will then uniformly deposit on the surface of the substrate (such as plastic film, paper, glass), forming a thin and dense functional film.

During the vacuum coating process, the molybdenum evaporation boat achieves the evaporation and deposition of materials through the following steps:

- Loading:  Place the material to be evaporated (such as metals like aluminum and copper) onto the molybdenum evaporation boat.

-Heating and Evaporation:  Place the molybdenum boat in a vacuum chamber and connect it to a power source. Use resistance heating or electron beam heating to bring the evaporation boat to a high temperature. Due to molybdenum's high melting point (2610°C), it can withstand high temperatures without melting or deforming.

- Material Evaporation:  At high temperatures, the loaded material melts and evaporates, forming metal vapor.

- Vapor Transport:  The metal vapor diffuses in the vacuum environment and reaches the surface of the substrate that needs to be coated.

- Film Deposition:  The metal vapor moves upward and condenses on the cooler substrate or surface to form a uniform film.

We have more than 1000 types of molybdenum boat molds, we can also customized according to customers' requirements. These are regular specifications: 

Molybdenum Evaporation Boat has many excellet properties as follows: 

-High melting point: 

The melting point of molybdenum is as high as 2610°C, allowing it to maintain structural stability at extremely high temperatures for a long time.

- Low thermal expansion coefficient:

Approximately 4.8×10^-6/°C, resulting in small size changes during temperature variations, which helps maintain the stability of the evaporation process.

- Excellent electrical and thermal conductivity:

Facilitates the rapid and uniform transfer of heat, enhancing the evaporation efficiency.

- Corrosion resistance:

It exhibits good oxidation resistance and corrosion resistance at high temperatures, enabling long-term use in a vacuum environment.

Molybdenum evaporation boats are primarily used in the coating industry, which is their most significant and widespread application field. Vacuum coating is employed to impart new functional properties to the surfaces of various materials.

- Optical Coating:

Used for manufacturing optical components such as reflectors, filters, and anti-reflective coatings, it involves depositing multiple thin films on lenses to achieve specific optical effects like reduced reflection, increased light transmission, water resistance, and stain resistance, thereby enhancing optical performance. 

- Semiconductor manufacturing:

In the process of semiconductor chip fabrication, it is used to deposit metal layers and insulating layers, enhancing the reliability and performance of devices.

- Display Manufacturing:

In the production of liquid crystal display (LCD) and organic light-emitting diode (OLED) panels, it is used for thin-film deposition.

- Electronics Industry:

Electrode or shielding layers are plated onto components such as semiconductors, capacitors, and resistors. This process is used in the manufacturing of electronic devices like vacuum tubes, transistors, and rectifiers. 

- Packaging Industry:

Coating aluminum on plastic films (such as BOPP, PET, PE) to produce packaging materials with barrier, decorative, and electromagnetic shielding functions (e.g., food bags, cigarette packaging, capacitor films).

- Decorative Industry:

Coating decorative films on the surfaces of toys, handicrafts, automotive parts, and other items.

- Nuclear Industry:

In the sintering process of nuclear fuel, molybdenum boats are used as containers for loading and transporting high-melting-point metals and alloys.

- Aerospace:

Nickel-based superalloys containing molybdenum are used to manufacture various high-temperature components for aviation and aerospace.

- High temperature resistance:  It can work continuously at temperatures ranging from 1400°C to 1800°C.

- Good thermal shock resistance:  It can withstand frequent starts and stops.

- High evaporation efficiency:  Heat is concentrated, and the evaporation rate is fast.

- Long lifespan: High-quality molybdenum boat can be operated continuously for several hours. The lifespan is 3-5 times that of ceramic boats.

- Higher film purity: Compared to electron beam evaporation, the pollution sources are relatively fewer.

- Compatibility with various materials: They are suitable for evaporating various metals including high-melting-point metals, alloys, and other materials.

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