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PFSF

Preheating Flash Sintering Furnace (Call for Quote)

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Description
Specifications
Standard Packages

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Description

Please call us for the price (Quote), thank you.

This is a Flash Sintering Furnace with preheating function, equipped with flash sintering power supply, through the electrode flange to introduce the current to the sample to apply an electric field, to achieve the Electric Current-Assisted Sintering (ECAS) processes, compared with the traditional ceramic sintering process, has the advantages of ultra-fast, energy-saving and conducive to the preparation of fine-grained ceramics, can be widely used in the flash sintering process of various ceramics.

Features

Vacuum: 1Pa (mechanical pump) or 5×10-4Pa (molecular pump)
Heating elements: molybdenum, platinum, tungsten, graphite can be selected. When choosing graphite as the heating element, the maximum heating temperature is 3000°C
The gap between the two heating elements can be adjusted to different sample thicknesses.
High-precision infrared thermometer is optional.

Safety

Overheat protection shuts down the furnace if temperature is outside of acceptable range (refer to controller's manual) or when the thermocouple is broken or malfunctions.
Power failure protection resumes furnace operation right after the point of failure when power is reestablished.
Limit switch turns off furnace once top is open.

Warning! NEVER fill furnace with explosive gases, including Hydrogen, Carbon Monoxide and Methane.

Specifications

Flash Sintering Furnace Parameter

Flash Sintering Power	The power supply parameters are programmable, and the current and voltage can be set by computer. Input voltage: 220V±10% Output voltage: 0~1000V, output current: 0~20A, power: 6KW; Output Voltage Stability≤1% Power supplies of other power are optional
Heating Elements:	Molybdenum, platinum, tungsten, graphite, when graphite is selected, the maximum temperature is 3000°C
Fastest Heating Rate:	≤200℃/s
Infrared Imaging: (Optional)	The furnace body has a side opening with a diameter of 10mm observation window for infrared temperature camera, the innovative video targeting function used to help the process be monitored intuitively and continuously, and the automatic emissivity matching function can avoid blindly setting the emissivity. Endurance companion software saves process temperatures for data analysis and sensor setup. Wide temperature range: 1000°C-3200°CMonochrome or two-color working mode

Preheating Furnace Parameters

Power	1.8KW
Heating Zone Length	205mm
Tube OD	OD 100mm
Voltage	220V
Heating Elements	Resistance wire
Thermocouple	K Type
Maximum Temperature	1200°C
Constant Temp	1150°C
Control Precision	±1℃
Heating Rate	≤ 30 ℃/ Min
Suggested Heating Rate	≤ 15 ℃/ Min
Chamber Material	High-purity alumina polycrystalline fiber
Software Control System	PC communication interface with data-logging

Standard Packages

Part description	Quantity	Part image
Preheating Flash Sintering Furnace	1 pc
Quartz tube	1 pc
Flange Set	1 set
Electric lifting	1
Electrode	2 rod
Sample Holder	1 set
Analog flow meter	1 pc
Stainless steel hook	1 pc
Quartz Furnace Plug	2
Alumina crucible	1
Thermal gloves	1 pair
K Type thermocouples	1 pc
COM to USB Connector Optional	1 set
PC Software（Optional)	1 pc
Manual	1 pc

FAQ

Overview

Please call us for the price (Quote), thank you.

Features

Vacuum: 1Pa (mechanical pump) or 5×10-4Pa (molecular pump)
Heating elements: molybdenum, platinum, tungsten, graphite can be selected. When choosing graphite as the heating element, the maximum heating temperature is 3000°C
The gap between the two heating elements can be adjusted to different sample thicknesses.
High-precision infrared thermometer is optional.

Safety

Overheat protection shuts down the furnace if temperature is outside of acceptable range (refer to controller's manual) or when the thermocouple is broken or malfunctions.
Power failure protection resumes furnace operation right after the point of failure when power is reestablished.
Limit switch turns off furnace once top is open.

Warning! NEVER fill furnace with explosive gases, including Hydrogen, Carbon Monoxide and Methane.

Application

Field-assisted sintering techniques (FAST) involve the application of an electric field during the sintering process.

Two aspects of FAST are flash and fast sintering. Both sintering methods involve the application of an electrical field during sintering without any applied pressure and is a novel method to quickly densify ceramics.

In flash sintering, densification under an electric field occurs in seconds, at a threshold temperature and field, which is accompanied by a non-linear increase in conductivity. Fast sintering can be considered a separate but related phenomenon when the rate of densification is enhanced by the application of an electric field but there is no abrupt densification. Fast sintering occurs at lower applied voltages compared to flash sintering. This study will limit its scope to only flash sintering, although it is noted that fast sintering itself merits further investigation.

Flash-burning technology is usually accompanied by the following three phenomena: 1. Thermal runaway inside the material; 2. A sudden drop in the resistivity of the material itself; 3. A strong flash phenomenon. Flash firing technology mainly involves three process parameters, namely furnace temperature (Tf), field strength (E), and current (J). A steady electric field is applied to the material, and the furnace temperature increases at a constant rate. When the furnace temperature is low, the material resistivity is high and the current flowing through the material is very small.

As the furnace temperature increases, the resistivity of the sample decreases and the current gradually increases. This stage is called the gestation stage, and the system is voltage-controlled. When the furnace temperature rises to the critical temperature, the resistivity of the material drops suddenly, the current rises sharply, and flash burning occurs. Since the field strength is still stable at this time, the system power (W=EJ) will quickly reach the upper limit of the electrical power of the power supply, and the system will change from voltage control to current control. This stage is called the flash-burning stage.

When the resistivity of the material no longer increases, the field strength stabilizes again, and sintering enters a stable stage, that is, the heat preservation stage of flash firing. After the heat preservation stage, a complete flash-firing process ends.