Liquidus Furnace
A liquidus furnace is useful for determining the maximum temperature at which crystallization will form in a glass, and a minimum temperature at which a glass can be held for extended periods of time without crystal formation and growth.
Samples of glass, frit, or cullet are loaded into a platinum tray then placed into the hot Orton Liquidus Furnace for 1 to 24 hours. The Orton Liquidus Furnace is a specially designed horizontal tube furnace with a controlled, reproducible, linear thermal gradient of approximately 120°C across a 12 long monitored zone, the glass temperature in the tray corresponds to its position along that 12 zone.
The tray is removed hot and allowed to quench cool, freezing the glass in the state it developed inside the furnace. Upon visual, or microscopic inspection, the crystal boundary plane (the Liquidus Point) is located and the temperature of that plane is interpolated from the temperature / position relationship of the known gradient.
Model GTF-MD-1612
General
A Horizontal, bench top gradient furnace system with 12 monitored zone. Typical temperature gradient is 10 -12°C/inch at 1400°C. Study the effects of temperature on ceramic properties of interest. As a liquidus furnace is useful for determining the maximum temperature at which crystallization will form in a glass, and a minimum temperature at which a glass can be held for extended periods of time without crystal formation and growth.
Can be operated according to ASTM C-829
Includes
- 1600°C Box furnace with 2.875 ID Alumina core tube
- Programmable process controller
- Alumina D-Tube hearth
- 7 Type “S” thermocouples spaced every 2 inches in the monitored zone
- 5KVA power transformer and 6 position temperature display meter.
Specifications
| Model | GTF-MD-1612 |
| Warranty | 12 Months |
| Temperature Range | RT to 1,600°C |
| Furnace | Tube style, 12 inch heated zone |
| Thermocouples | Type “S |
| D-tube hearth | Alumina – 2.5 wide, 17 long |
| Thermocouple spacing | 2 inches |
| Heating elements | Molybdenum Disilicide |
| Temperature Control | Honeywell UDC 3200 Process controller |
| Power Control | 4-20ma / SCR |
| Total Gradient | 120 – 144°C |
| Heating/Cooling Rate | 1 to 10°C/minute |
| Power Requirements | 208-240vac, 30amp, 50 or 60Hz |
| Computer Interface | Optional |
| Atmosphere | Optional |
| Bench-top Footprint (Furnace) | 25 x 15 x 18 (L x W x H) |
| Component Dimensions | Controller Console 17 x 14 x 5.5 Transformer 15 x 9 x 10 Temperature Display 10 x 8 x 4.5 |
| Shipping Weight/Dimensions | 186 lbs. / 49 x 26 x 31 (1 carton on 1 pallet) |