Function Overview
The experimental purpose of this device is to determine the material's resistance to thermal shock by assessing the degree of damage to a specimen of a certain shape and size after undergoing rapid temperature changes from high to low, under specified test temperatures and cooling medium conditions. According to customer requirements, the device can accommodate specimens of a certain volume for alternating placements between high temperature-low temperature and high temperature-water environments, and then determine the material's resistance to thermal shock based on the degree of damage. The equipment is divided into two units: a high-medium temperature test unit and a high-temperature water test unit. The high-medium temperature test unit utilizes silicon carbide tubes for heating both high and medium temperature furnaces, capable of reaching temperatures up to 1400°C. The low-temperature furnace also uses silicon carbide tubes for heating, reaching temperatures up to 1400°C. Both furnaces are horizontally placed (or vertically, as per customer choice), with the high-temperature furnace on the left and the low-temperature furnace on the right. In the high-temperature water test unit, the high-temperature furnace is on the left, and the constant temperature water bath is on the right. Samples are heated in the high-temperature furnace and then horizontally (or vertically, as per customer choice) pushed into the constant temperature water bath. Both test units can complete multiple high-temperature furnace to low-temperature furnace, high-temperature furnace to constant temperature water bath rapid cooling and heating cycles to test the sample's thermal shock resistance. During the test, the transfer of the sample from the high-temperature to the low-temperature zone can be quickly completed. To prevent significant temperature drops during transfer, there are corresponding control measures in place to ensure that temperature fluctuations do not significantly affect the test results.
Instrument specifications
In this unit, both the high-temperature and low-temperature furnaces are heated using silicon carbide tubes. The two furnace bodies can achieve continuous temperature increase from room temperature to 1400°C with adjustable settings, and can maintain a constant temperature at any point.
● High-Temperature Furnace (High-Temperature Zone for Thermal Shock Test)
(1) Heating Element Material: Silicon carbide tube components
(2) Maximum working temperature: 1400°C
(3) Temperature Control Accuracy: Better than ±0.5℃
(4) Constant Temperature Zone Length: 90mm;
(5) Furnace Chamber Diameter: 50mm
(6) Thermocouple z Large Allowable Error: ±0.25%t
(7) Thermocouple temperature measurement probe distance from sample: less than 8mm.
(8) Maximum heating rate: 40°C/min
(9) Uniformity of temperature field in恒温区: ≤±2℃
(10) Surface Temperature Rise of Furnace Wall: ≤45℃
(11) Vacuum Unit: Vacuum Level ≤ 10 Pa, Extraction Rate 4 L/s, Vacuum Gauge Accuracy: Relative Indication Error ±3%
(12) Gas Path Unit: This unit is a 3-way gas mass flow controller, enabling continuous adjustable flow rates for three gas paths. The flow rate range is (0~100) ml/min. The 3-way mass flow controllers are suitable for inert protective atmospheres such as N2, Ar, and He. Equipped with solenoid valves, the gas paths can be automatically switched between the three paths.
● Low-temperature furnace (low-temperature zone for thermal shock test):
(1) Heating Element Material: Silicon Carbide Tube Components
(2) Maximum working temperature: 1400°C
(3) Temperature Control Accuracy: Better than ±0.5℃
(4)恒温 Zone Length: 90mm
(5) Furnace cavity diameter: 50mm
(6) Thermocouple z Maximum Allowable Error: ±0.25%t
(7) Thermocouple temperature sensing tip distance from sample: Less than 8mm.
(8) Maximum heating rate: 40°C/min
(9) Uniformity of temperature field in恒温区: ≤±2℃
(10) Surface temperature rise of furnace wall: ≤45℃
(11) Vacuum Unit: Vacuum Degree ≤10Pa, Extraction Rate 4L/s, Vacuum Gauge Accuracy: Relative Indication Error 3%
(12) Gas Path Unit: This unit is a 3-way gas mass flow controller, allowing continuous adjustment of flow rates across three gas paths, with a flow rate range of (0~100) ml/min. The 3-way mass flow controllers are suitable for inert protective atmospheres such as N2, Ar, and He. Equipped with solenoid valves, the three gas paths can be automatically switched.
(13) After transferring the sample from the high-temperature furnace to the low-temperature furnace, the internal temperature should be maintained within ±5℃ of the set temperature.
● Constant temperature circulating water tank
Temperature range: -20~100°C; the circulating water tank features both heating and cooling capabilities, and can maintain a constant water temperature at any point between -20~100°C.
(2) Temperature Control Accuracy: Better than 0.1℃
(3) Sink Capacity: 20L
(4) Sink Material: Made of 304 stainless steel, the insulation material in the sandwich should be added, with the total thickness of the inner and outer walls and insulation layer ≥ 30mm.
(5) Temperature difference between water entering and exiting during the rapid cooling process of the sample: ≤5℃
(6) Equipped with heating and cooling functions, it can automatically track and adjust the temperature of the circulating water through settings. The flow rate at the outlet is adjustable, and it also features low liquid level and over-temperature alarm and protection functions.
● Sample holder and transfer mechanism:
Composed of a central rod and sample clamps, it allows for the holding and automatic transfer of samples in various shapes and sizes.
(2) No mechanical collisions will occur during the sample transfer process, preventing any damage to the samples.
(3) Achieve automatic and rapid switching of samples between high-temperature furnaces, low-temperature furnaces, and circulating water tanks, with switchable timing, ≤2s switching time.
● Sample Specifications:
Material: Any material below 1400℃ is acceptable.
2) Shape and Size: Any sample within 30mm in length, width, and height is acceptable.
Control System:
(1) The temperature control signal can be used to regulate the high-temperature and low-temperature furnace's heat output voltage, thereby controlling the internal temperature of the furnace.
(2) The system can automatically set the type of reaction gas and control the gas flow rate by controlling the three-way quality flow meter, solenoid valves, etc.
(3) Automatically vacuum-seals and displays the vacuum level inside the furnace in real-time.
(4) The controllable transfer mechanism automatically transfers between the high-temperature furnace to the low-temperature furnace or the high-temperature furnace to the circulating water tank.
(5) The system can be programmed for experiments, including parameters such as vacuum pumping, vacuum level setting, protective atmosphere type, gas flow rate, experimental temperature in high and low temperature zones, constant temperature duration, and impact test cycle次数. Once programmed, the system operates automatically without human intervention.
(6) Interlock Protection: Equipped with interlock protection functions such as over-temperature, over-current, and incorrect operation, it can produce a cascading effect with the heating unit to ensure timely protection of hardware or software when the equipment encounters an emergency situation.
(7) Operational Alarms: In case of abnormal operation in the heating unit, vacuum unit, or gas circuit unit, an automatic alarm can be triggered. The alarm is a combination of audio and visual signals, and it can be cleared through configuration software or buttons on the control cabinet.
