Thermal Conductivity
Thermal conductivity is the property of a material to conduct heat.
Heat transfer occurs at a lower rate across materials of low thermal conductivity than across materials of high thermal conductivity. Materials of low thermal conductivity are used as thermal insulation. The thermal conductivity of a material may depend on temperature.
Calorimeter Method
The thermal conductivity of refractories is a property required for selecting their thermal transmission characteristics. Users select refractories to provide specified conditions of heat loss and cold face temperature, without exceeding the temperature limitation of the refractory. This test method establishes the testing for thermal conductivity of refractories using the calorimeter.
This procedure requires a large thermal gradient and steady state conditions. The results are based upon a mean temperature.
The data from this test method are suitable for specification acceptance, and design of multi-layer refractory construction.
Hot Wire Method
The hot wire technique is a transient, intermittent isothermal method for measuring thermal conductivity. A thin platinum wire is placed between two appropriately prepared 9″ bricks of same density. Heat generated by current applied to the wire is conducted away from the wire at a rate dependent on the thermal conductivity of the material.
Contact us today: baldwin@ortonceramic.com or Call 614-818-1330 to discuss your application.
Hot Wire
General
the Model TCH-16 Hot Wire system measures the thermal conductivity of a single sample of refractory material with a thermal conductivity up to 15 W/mK at temperatures between ambient and up to 1650°C in air. The 4 sample furnace (9 inch brick samples) is lined with high purity ceramic fiber and is heated with molybdenum disilicide heating elements, and controlled with a type “S thermocouple.
Operated according to ASTM C-1113
Includes
- 1600°C furnace
- Programmable process controller
- Sensor sytem for the Hot Wire array
- Platinum Hot Wire Harness
- Type “S” thermocouples,
- computer software
- Accessories and instruction manual. (Computer not included.)
Specifications
| Model | TCH-16 |
| Warranty | 12 Months |
| Temperature Range | RT to 1,650°C |
| Furnace | Side load, box furnace |
| Thermocouples | Type “S” 2 wire |
| Samples | x4 channels |
| Max Sample Size | 9 inch Brick |
| Heating elements | molybdenum disilicide x10 |
| furnace Power control | 4-20ma SCR |
| Power controls | inlclude E-Stop |
| Temperature Control | User Programmable, PID Controller |
| Heating Rate | 1 to 30°C/minute |
| Power Requirements | 240vac/70amp 50/60Hz |
| Data Acquisition | Software included |
| Data Analysis | Software included |
| Computer Interface | Ethernet |
| Overtemp | Included |
| Electrical Resistivity | Optional |
| Appoximate weight | 1323 lbs (600kg) |
| Furnace Footprint Length x Depth x Height | 40 x 37 x 72 (102 x 94 x 183 cm) |