Our Arc Melt Furnace ABJ-900-3 with the Crystal Growth option is the larger cousin of our TA-200, featuring a larger chamber, larger power supply, top loading instead of bottom loading for easier access, and larger melts. The crystal growth components are set up to grow single crystals of semiconductor materials, metals, salts and synthetic gemstones using the Czochralski method.

This furnace has three electric stingers, for simultaneously melting material with three arcs in three different places. This furnace is capable of melting materials above 3500°C. A crystal seed attached to the seed rod then lowers into the center crucible of the 9″ (225 mm) hearth holding the melt and is programmed to pull the growing crystal.

The pulling speed is fully programmable and controls accurately as low as 0.001 mm/min.  The 3/8” seed rod has an adjustable rotational speed from 0-30 rpm. The maximum pull height is 7″ (176 mm).

General Specifications
for crystal growth using Czochralski method
adjustable pulling speed as low as 0.001”/min. (0.025mm/min)
7″ travel
9″ (229mm) hearth with custom cavity shapes
adjustable seed rod rotation
Tri-Arc melting furnace for fast homogeneous melts up to 3500°C

Arc Melting Furnace ABJ-900-3
For details on the Arc Melting Furnace refer to Arc Melting Furnace ABJ-900-3. Described below are the components relating to the crystal growing option on this furnace.

Crystal Puller Components
A servo motor and drive for controlling the travel speed
A gear reducer to allow slow pulling speeds from 14 mm per minute down to 0.001 mm per minute
A precision slide to move the seed rod up and down in the chamber, 7” (178 mm) of travel
A DC motor to allow the seed rod to be rotated 0 to 30 RPM
Vacuum tight seal around seed rod to isolate the chamber environment
Touch screen to provide easy programmable operation and display of the crystal puller
Control Enclosure houses all electrical components
Slide, motors, gearboxes and seed rod attach to a support rod aside the furnace frame
The puller travel speed ranges from 0.001 mm per minute to 14 mm per minute depending on servo motor speed. Seed rod rotation of 30 RPM maximum.

In order to grow a crystal the melting of the sample must be used in conjunction with the crystal puller. When growing crystals, a customer-supplied seed crystal has to be attached to the seed rod. This seed is then lowered into the melt, and is slowly pulled up with the provided crystal puller in order to grow a larger crystal. The maximum travel distance is approximately 175 mm (7”).

The arc melting furnace is used to melt the raw material in the crucible with the three arcs. Once melted, the stingers can remain in place to keep a homogeneous melt for growing the crystal.

Available Options for Arc Melt Furnace ABJ-900-3:
Crystal Puller – allows the formation of single crystals using the Czochralski method
Custom Melt Cavities – for custom melt shapes
High Vacuum kit, Turbo or Diffusion pump – for ultra pure environments
Load Lock– allows additional material to be loaded without breaking chamber atmosphere
Splat Rod – allows quick dispersion of melt to provide instant cooling and solidification
Oxygen Monitor – Monitors gas supply or chamber gas for O2 content
Gas Purifier – Removes impurities in process gas below to 10-6 ppm
Recirculating Water Chiller – Provides cooling water in a closed loop system
Suction Casting – Allows melted material to be formed into a cast by means of vacuum suctioning
UPS – to keep essential components operational during power outages

Crystal growth
Arc casting
Powder melting
Melting point determination
Metallic buttons
Creating alloys
Crucible welding
Material densification
High purity melts