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High-Temperature Bottom Loading Furnace up to 1650 °C with Integrated Speed Cooling System for Sintering of Translucent Zirconia

High-temperature bottom loading furnace LHT 01/17 LB Speed with rapid cooling function High-temperature bottom loading furnace LHT 02/17 LB Speed with rapid cooling function

Charge saggar, starter-set

Automated table lowering for cooling

Due to their maximum temperature of 1650 °C and their large furnace chamber, the high-temperature bottom loading furnaces are perfectly suited for sintering translucent zirconia. The motor-driven lifting table significantly simplifies the charging of the high-temperature furnace. The all-around heating of the cylindrical furnace chamber ensures a very even temperature uniformity.

Equipped with special heating elements made of molybdenum disilicide, chemical interactions between the charge and the furnace components are optimally avoided. The sintered material is placed in saggars made of technical ceramics. Up to two batch containers for max. 15 single crowns per level can be accommodated in the LHT 01/17 LB Speed. The LHT 02/17 LB Speed offers space for up to three saggars for max. 25 individual crowns per level and thus guarantees high productivity.

The high-temperature bottom loading furnaces are additionally equipped with a drying as well as a forced cooling function. For residual drying, the oven remains open gapwise during heating up to a defined temperature and thus ensures reliable removal of moisture. For accelerated cooling, the furnace is automatically opened step by step under program control. Depending on the batch used and the saggars, these high-temperature furnaces can achieve total cycle times of less than two and a half hours. The furnaces can be individually programmed for all recommended sintering curves of all zirconia manufacturers.

  • Tmax 1650  °C
  • Furnace chamber with a volume of 1 or 2 liters, table with large floor space
  • High-quality heating elements made of molybdenum disilicide offer best possible protection against chemical interaction between charge and heating elements
  • Appealing, double-walled stainless steel housing
  • Only fiber materials are used which are not classified as carcinogenic according to TRGS 905, class 1 or 2
  • Outstanding temperature uniformity due to all-round furnace chamber heating
  • Scope of delivery includes a starter set for charging on one level, additional levels as additional equipment
  • Precise, motorized toothed belt drive of the table with button operation
  • Residual drying function for better ventilation of the oven when heating up
  • Forced cooling function with automatic, step-by-step opening from a preset temperature
  • Exhaust air vent in the roof
  • Type S thermocouple
  • Controller P480 with memory for 50 programs, 2 sample programs
  • Usable for sintering blanks of all leading manufacturers
  • Drying function: When starting the program the table will be driven in drying position and closes automatically at 500  °C
  • Defined application within the constraints of the operating instructions
  • NTLog Basic for Nabertherm controller: recording of process data with USB-flash drive

Additional equipment

  • Over-temperature limiter with adjustable cutout temperature for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load
  • Stackable saggars for loading in up to two or three levels, depending on model
  • Process control and documentation via VCD software package for monitoring, documentation and control
ModelTmaxInner dimensions in mmVolumeMaximumOuter dimensions in mm1ConnectedElectricalWeightMinutes
 °Cwdhin lunitsWDHload kWconnection*in kgto Tmax
LHT 01/17 LB Speed16501451801001303505906802.21-phase4085
LHT 02/17 LB Speed16501851801852753905907653.41-phase5075
*These furnaces are available for main voltage of 200 V, 208 V, 220 V - 240 V, 1/N/PE or 2/PE
1External dimensions vary when furnace is equipped with additional equipment. Dimensions on request.
 

High-Temperature Furnaces up to 1650 °C for Sintering Translucent Zirconia

LHT 01/17 D LHT 03/17 D

Saggars with top lid for high-temperature furnace LHT 01/17 D

Charge saggar, starter-set for high-temperature furnace LHT 03/17 D

Over-temperature limiter

These high-temperature furnaces are ideally suited for sintering bridges and crowns made of translucent zirconia. The special heating elements made of molybdenum disilicide promise the best possible protection against chemical interaction between the charge and the furnace components. The bridges and crowns are loaded in ceramic saggars. These high-temperature furnaces are particularly convincing due to their excellent price-performance ratio. The furnaces can be individually programmed for all recommended sintering curves by almost all zirconium manufacturers.

  • Tmax 1650  °C
  • Furnace chamber with a volume of 1 or 4 liters
  • Special heating elements made of molybdenum disilicide offer best possible protection against chemical interaction between charge and heating elements
  • Dual shell housing made of textured stainless steel sheets with additional fan cooling for low surface temperature
  • Only fiber materials are used which are not classified as carcinogenic according to TRGS 905, class 1 or 2
  • Compact design with lift door, opening upwards
  • Scope of delivery includes a starter set for charging on one level, additional levels as additional equipment
  • Adjustable air inlet
  • Furnace chamber can be charged with up to two (LHT 01/17D) or three (LHT 03/17D) saggars, 15 or 25 individual crowns per level (depending on model)
  • Exhaust air opening in the roof
  • Type S thermocouple
  • Precise temperature control, also in the lower temperature range for drying
  • Controller P480 (LHT 01/17 D) or P470 (LHT 03/17 D) with memory for 50 programs
  • Freely usable for sintering blanks of almost all leading manufacturers
  • Defined application within the constraints of the operating instructions
  • NTLog Basic for Nabertherm controller: recording of process data with USB-flash drive

Additional equipment

  • Over-temperature limiter with adjustable cutout temperature for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load
  • Saggar for charging of up to three layers
  • Process control and documentation via VCD software package for monitoring, documentation and control
ModelTmaxInner dimensions in mmVolumeMaximum Outer dimensions in mm3ConnectedElectricalWeightMinutes
 °Cwdhin lunitsWDH2load kWconnection*in kgto Tmax1
LHT 01/17 D1650110120120130385425525+1952.21-phase2810
LHT 03/17 D1650135155200475470630770+2603.01-phase7560
*These furnaces are available for main voltage of 200 V, 208 V, 220 V - 240 V, 1/N/PE or 2/PE
1If connected at 230 V 1/N/PE3External dimensions vary when furnace is equipped with additional equipment. Dimensions on request.
2Including opened lift door
 

High-Temperature Furnace with SiC Rod Heating for Sintering Zirconia up to 1550 °C

LHTCT 01/16 LHTCT 01/16

Furnace chamber with high-quality fiber materials and SiC heating rods on both sides of the furnace

Saggars with top lid

Designed as a table-top model with SiC heating rods, this comparably inexpensive high-temperature furnace offers numerous advantages when sintering non-translucent zirconia with an operating temperature of up to 1500 °C. Compared to other models, however, the costs for changing the heating elements are higher.The large heating chamber and fast heat-up times make this model a good choice for CAD/CAM machining of zirconia. The controller of the furnace is freely programmable for the individual sintering of the zirconia material. The high-temperature furnace is also designed for connection to the single-phase power grid.

  • Tmax 1550  °C
  • Working temperature 1500  °C, increased wear and tear must be expected in case of working at higher temperatures
  • Single-phase connection (LHTCT 01/16)
  • Dual shell housing made of textured stainless steel sheets with additional fan cooling for low surface temperature
  • Only fiber materials are used which are not classified as carcinogenic according to TRGS 905, class 1 or 2
  • Adjustable air inlet
  • Type S thermocouple
  • Controller C450
  • Switching system with solid-state-relays, power tuned to the SiC rods
  • Easy replacement of heating rods
  • Defined application within the constraints of the operating instructions
  • NTLog Basic for Nabertherm controller: recording of process data with USB-flash drive

Additional equipment

  • Over-temperature limiter with adjustable cutout temperature for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load
  • Square saggar for charging of up to three layers (15 single crowns)
  • Lid for top saggar
  • Process control and documentation via VCD software package for monitoring, documentation and control
ModelTmaxInner dimensions in mmVolumeMaximumOuter dimensions in mm4ConnectedElectricalWeightMinutes
 °Cwdhin lunitsWDH1load kWconnection*in kgto Tmax2
LHTCT 01/1615501101201201.530340300460 + 1953.51-phase1840
LHTCT 03/1615501202101203.090400535530 + 2159.03-phase34040
*These furnaces are available for main voltage of 200 V, 208 V, 220 V - 240 V, 1/N/PE or 2/PE1Including opened lift door
2If connected at 230 V 1/N/PE3Heating only between two phases
4External dimensions vary when furnace is equipped with additional equipment. Dimensions on request.
 

Accessories for Sintering Furnaces

Charge Saggars for Sintering Furnaces LHT 02/17 LB Speed, LHTCT 03/16 and LHT 03/17 D

For charging zirconia workpieces charge saggars are recommended. A saggar basically consists of the sintering dish as base and the spacer ring with ventilation openings. The material is highly resistant to temperature fluctuations and can be used for processes with short heat-up and cool-down times.

When charging the furnace it must be ensured that the lower charge carrier is generally resting on the spacer ring. This provides for air-circulation under this carrier and improves the temperature uniformity. It is recommended to cover upper saggar with another sintering dish as lid.

The starter set consists of a charge saggar, a spacer ring as a base and a second sintering dish as lid. The use of additional saggars (sintering dish and spacer ring) allows charging on additional levels. Both furnace models are designed to get charged with up to three charge saggars.

Number of required charge levels in overview:

  • 1 level: Starter set which includes 2 sintering dishes and 2 spacer rings
  • 2 levels: Starter set + 1 sintering dish + 1 spacer ring
  • 3 levels: Starter set + 2 sintering dishes + 2 spacer rings
   
Starter-Set, Ø 115 mm Article No.: 699001066 Sintering Dish, Ø 115 mm Article No.: 699001054 Spacer Ring with Ventilation Openings Article No.: 699001055
         
 

Charge Saggar for Sintering Furnaces LHT 01/17 Speed, LHTCT 01/16 and LHT 01/17 D

Placing the zirconia product in charge saggars provides for optimum utilization of the furnace chamber. Up to three saggars can be stacked in the furnaces. The integrated air slots ensure a better air circulation of the charge. The upper saggar can be closed with a separate ceramic lid.

   
Safe charging on up to three levels Charge Saggar, 110 x 75 x 30 mm Article No.: 699000279 Lid for Charge Saggar Article No.: 699000985
         
 

Note: The Accessories Described above are Designed for Cold Charging and Discharging. Removing the Accessories in Hot Condition is not Possible.
ModelHeating elementsSupport tubesThermocoupleSpring lift doorBottom plate
       
 Article No.ImageArticle No.Article No.Article No.Article No.
LHT 01/17 D4 x 692253380 -5403003842 x 691400598601604420
LHT 03/17 D4 x 692252721 -5403005542 x 691400599-
LHTCT ../164 x 602212884 -5403003842 x 691400598601604420
LHT ../17 LB Speed4 x 692252721 -540300554--
LT 02/13 CR2 x 692253400 12 x 6920402515403002572 x 691400598-