How To Choose A Tube Furnace for your laboratory

How To Choose A Tube Furnace for your laboratory

1. Know your application

Single Zone vs Multi-Zone: Multi-zone furnaces have multiple independently-controlled, constant-temperature zones, which allows controlled temperature gradient or a longer heating zone

Horizontal (standard) vs Vertical: Vertical tube furnace provides smaller footprint and can be used for fast heating / quenching process

RTP (Rapid Thermal Processing): Slideable sample holder or furnace for maximum heating / cooling rate

Rotary Tube Furnace: Tube is rotated during heating for better powder processing / coating uniformity

Gas Processing Capability: Special models for Hydrogen gas processing and high-temperature corrosion research are available

Multi-Function: Tube furnace based complete systems, such as CVD, PECVD, HPCVD, ALD, Graphene & 2D material growth system, are available

2. Certifications for tube furnace

All NBD's furnaces are assembled and quality controlled in China and CE certified

3. Choose working temperature

Please note there are maximum temperature (can be maintained < 1 hr) and continuous working temperature (safe, continuous use temperature)

The maximum working temperature depends on the heating element used, and can be divided into three categories:

a.   Working temp: ≤ 1150 °C       Max temp:1200℃  alloy heating element        K type thermocouple
b. Working temp: ≤ 1450 °C       Max temp:1500℃ SiC heating element            S type thermocouple
c. Working temp: ≤ 1650 °C       Max temp:1700℃ MoSi2 heatin element          B type thermocouple

Select the processing tube corresponding to the furnace max temperature:

a. Quartz tube:            ≤ 1200 °C in 1 atm; ≤ 1000 °C under vacuum
b. Alumina tube:          ≤ 1800 °C in 1 atm; ≤ 1500 °C under vacuum

Select the crucible corresponding to the furnace max temperature:

a. Quartz crucible:        ≤ 1200 °C
b. Alumina crucible:      ≤ 1700 °C
c. Zirconia crucible:      ≤ 2100 °C

4. Choose heating zone length based on your sample

Please note there are total heating zone length (length covered by heating element) and constant temperature zone length (center zone with less than +/- 1 °C variation). Constant temperature zone is always shorter than the total heating zone. Please choose a tube furnace with a constant temperature zone longer than your sample for uniform heating

5. Choose the tube size (inner diameter) and crucible size based on your sample

Please choose the corresponding tube size and crucible size based on the sample volume

6. Choose input voltage

Choose between 110 VAC and 220 VAC depending on the country or region

7. Choose a vacuum pump

Select mechanical pump for vacuum up to 1.0E-2 Torr; select turbomolecular pump for vacuum up to 1.0E-5 Torr. To minimize oil particle contamination, oil-less pump (vacuum up to 1.0E-2 Torr) can be used to replace mechanical pump

8. Customize your furnace by choosing from various furnace accessories provided by NBD

Controlled gas delivery,Flow meter & mass flow controller, vacuum / pressure gauge and controller

9. If any question on configuring your tube furnace, please contact NBD technical support to discuss your application needs

Contact us by phone: +86--18538509702, or email: nbd@nbdkj.com

VLS Via High Temperature Tube Furnace

NBD high temperature tube furnace is widely used in vapor–liquid–solid method (VLS) in laboratory of university and research institutions. In order to meet requirements of vapor–liquid–solid method (VLS). NBD developed single zone tube furnace, dual zone tube furnace, three zone tube furnace. NBD also can design tube furnace according to user’s special experiment process.

The vapor–liquid–solid method (VLS) is a mechanism for the growth of one-dimensional structures, such as nanowires, from chemical vapor deposition. The growth of a crystal through direct adsorption of a gas phase on to a solid surface is generally very slow. The VLS mechanism circumvents this by introducing a catalytic liquid alloy phase which can rapidly adsorb a vapor to supersaturation levels, and from which crystal growth can subsequently occur from nucleated seeds at the liquid–solid interface. The physical characteristics of nanowires grown in this manner depend, in a controllable way, upon the size and physical properties of the liquid alloy.

The VLS mechanism is typically described in three stages:

• Preparation of a liquid alloy droplet upon the substrate from which a wire is to be grown.
• Introduction of the substance to be grown as a vapor, which adsorbs on to the liquid surface, and diffuses into the droplet.
• Supersaturation and nucleation at the liquid/solid interface leading to axial crystal growth.

VLS via Single Zone Tube Furnace 

 

VLS via dual Zone Tube Furnace 

 

 

2016 China International Functional Materials & technological Exhibiti

2016 China International Functional Materials & technological Exhibition will be  held on 26 July - 28 July in Chongqing Yuelai Congress Center, Chongqing, China. There are over 10,000 attendees and 2000 exhibitors in the conference. NBD Corporation holds a booth at # T23 with RTP tube furnace,CVD tube furnace, PECVD. NBD representatives are excited to meet our valuable customers from all over the world.
Our offical website: http://en.nbdkj.com