■ Function Introduction

The experimental purpose of the device is to determine the thermal shock resistance of the material according to the degree of damage after the sample of a certain shape and size is subjected to sudden temperature change under the specified test temperature and cooling medium conditions. According to user requirements, a certain volume of samples can be placed from high temperature to low temperature, high temperature to water and back, and after undergoing sudden temperature change of hot and cold, the thermal shock resistance of the material can be determined according to its damage degree. The equipment is divided into two units, one is high school temperature test unit, high temperature water test unit. High school temperature test unit high school temperature two furnace bodies are heated by silicon carbon tube, which can reach a temperature within 1400℃, low temperature furnace body is heated by silicon carbon tube, which can also reach a temperature within 1400℃. The two furnace bodies are placed horizontally (or vertically according to the user), the high temperature furnace body is on the left, and the low temperature furnace body is on the right. In the high temperature water test unit, the high temperature furnace body is on the left, and the constant temperature water bath is on the right. The sample is heated in the high temperature furnace, and then pushed into the constant temperature water bath horizontally (or vertically according to the user's choice). The two test units can respectively complete the high temperature furnace → low temperature furnace, high temperature furnace → constant temperature circulation tank for several times of rapid cooling and rapid heat shock, and then complete the thermal shock performance test of the sample. During the test process, the sample transfer from the high temperature zone to the low temperature zone can be completed quickly. In order to prevent the sample from dropping significantly during the transfer process, there are corresponding control measures to ensure that the temperature does not fluctuate greatly and thus affect the test results.

■ Instrument index

In this device, the high temperature furnace and low temperature furnace are all heated by silicon carbide tube, and the two furnace bodies can realize continuous temperature rise adjustable between room temperature ~1400℃, and can realize constant temperature at any point.

● High temperature furnace (thermal shock experiment high temperature zone) :

(1) heating body material: silicon carbide tube element;

(2) z high working temperature: 1400℃;

(3) Temperature control accuracy: better than ±0.5℃;

(4) Length of constant temperature zone: 90mm;

(5) Inner diameter of furnace chamber: 50mm;

(6) Maximum tolerance of thermocouple z: ±0.25%t;

(7) Distance between thermocouple temperature measuring end and sample: less than 8mm;

(8) z heating rate: 40℃/min;

(9) Uniformity of temperature field in constant temperature zone: ≤±2℃;

(10) Furnace wall surface temperature rise: ≤45℃;

(11) Vacuum unit: vacuum degree ≤10Pa, pumping speed 4L/s, vacuum gauge accuracy: relative indication error 3%;

(12) Gas path unit: The unit is a 3-way gas mass flow controller, which realizes the continuous adjustable gas flow rate of the 3 gas paths, and the gas flow rate range is 0~100 ml/min. The 3-way mass flow controller is suitable for N2, Ar, He and other inert protection atmospheres. And equipped with a solenoid valve, 3 gas routes can be automatically switched between.

● Low temperature furnace (thermal shock test low temperature zone) :

(1) heating body material: silicon carbide tube element;

(2) z high working temperature: 1400℃;

(3) Temperature control accuracy: better than ±0.5℃;

(4) Length of constant temperature zone: 90mm;

(5) Inner diameter of furnace chamber: 50mm;

(6) Maximum tolerance of thermocouple z: ±0.25%t;

(7) Distance between thermocouple temperature measuring end and sample: less than 8mm;

(8) z heating rate: 40℃/min;

(9) Uniformity of temperature field in constant temperature zone: ≤±2℃;

(10) Furnace wall surface temperature rise: ≤45℃;

(11) Vacuum unit: vacuum degree ≤10Pa, pumping speed 4L/s, vacuum gauge accuracy: relative indication error 3%;

(12) Gas path unit: The unit is a 3-way gas mass flow controller, which realizes the continuous adjustable gas flow rate of the 3 gas paths, and the gas flow rate range is 0~100 ml/min. The 3-way mass flow controller is suitable for N2, Ar, He and other inert protection atmospheres. And equipped with a solenoid valve, 3 gas routes can be automatically switched between;

(13) After the sample is transferred from the high-temperature furnace to the low-temperature furnace, the temperature in the furnace should be kept within the set temperature of ±5℃.

● Constant temperature circulation tank:

(1) Temperature range: -20~100℃, the circulation tank has heating and cooling functions at the same time, and can achieve constant water temperature at any point of -20~100℃;

(2) Temperature control accuracy: better than 0.1℃;

(3) Tank volume: 20L;

(4) Sink material: 304 stainless steel, interlayer need to increase insulation material, inner, outer wall and insulation layer total thickness ≥30mm;

(5) The temperature difference between the inlet water temperature and the outlet water temperature during the sample quenching process: ≤5℃;

(6) With heating and cooling functions, the temperature of circulating water can be automatically tracked and adjusted by setting, the flow rate of the outlet can be adjusted, and the low liquid level and overtemperature alarm and protection function can be provided.

● Sample holding and transfer mechanism:

(1) Composed of a center bar and a sample fixture, it can realize the clamping and automatic transfer of samples of different shapes and sizes;

(2) There will not be any mechanical collision during the sample transfer process, resulting in sample damage

(3) To realize the sample in the high temperature furnace, low temperature furnace and circulating water tank automatic rapid change, the switching time is controllable, the switching time is less than 2s

● Sample size:

1) Material: Any material below 1400℃ can be used;

2) Shape and size: length * width * height within 30mm of any shape samples are acceptable;

● Control system:

(1) According to the feedback signal of the temperature controller, the heat output voltage of the high temperature furnace and the low temperature furnace can be controlled to realize the temperature control in the furnace body;

(2) It can automatically set the type of reaction gas and control the gas flow rate by controlling 3 mass flowmeters, solenoid valves, etc.

(3) It can automatically vacuum and display the vacuum value in the furnace body in real time;

(4) The transfer mechanism can be controlled automatically between high temperature furnace → low temperature furnace or high temperature furnace → circulating water tank;

(5) Experimental procedures can be set, including vacuum extraction, vacuum degree setting, protection atmosphere category, gas flow rate, high and low temperature area experiment temperature, constant temperature time, impact experiment cycle number and other parameters, after the program is set, the system can run automatically without human intervention.

(6) Interlock protection: with over temperature, over current, misoperation and other interlock protection function, can have a chain effect with the heating unit, to ensure that the equipment in the event of emergencies, can be timely hardware or software protection;

(7) Operation alarm: When the heating unit, vacuum unit and gas circuit unit work abnormally, automatic alarm can be carried out, the alarm mode is sound and light alarm, and the alarm can be eliminated through the configuration software and the button on the control cabinet.