GHC-II Solid Material High Temperature Specific Heat Capacity Tester

1、 System Introduction
Specific heat is the most fundamental physical property parameter of matter, and many measurement methods have been developed for different temperature ranges and materials. The high-temperature specific heat testing system we designed is based on the basic definition of specific heat and uses a mixed method for testing (adiabatic method is used for testing below 100 degrees to -200 degrees, implemented by DHC-II material low-temperature specific heat capacity tester). Using modern computer testing technology to automatically test the specific heat capacity of solid materials at different temperatures. Widely used in scientific research and teaching for testing and researching the specific heat capacity of solid materials.
2、 System composition
The GHC-II solid material high-temperature specific heat capacity tester consists of a tubular vertical resistance furnace (with resistance wire heating at 1000 degrees, molybdenum wire heating at 1700 degrees, and graphite furnace tube heating above 1700 degrees), a thermostat, temperature controller, high-precision thermometer, calorimeter, computer testing system, etc. During the experiment, the sample is first heated to the experimental temperature in a tubular heating furnace, and then dropped into a calorimeter. The temperature changes of the sample and calorimeter are collected by a computer measurement system throughout the process. Finally, determine the specific heat capacity of the material. A vacuum system is required for samples that are prone to oxidation at high temperatures.
3、 Principle of Temperature Variation and Experimental Method of Temperature Control
The temperature control of a vertical tubular electric furnace varies depending on the temperature requirements, with different heating materials and electrical control methods. The heater uses high vacuum insulation or a permeable atmosphere (argon, ammonia, etc.), while the graphite furnace is protected by a water-cooled shell. The temperature control adopts program control and intelligent PID regulation, and the temperature control curve can be set arbitrarily. By using a temperature controller to control heating, the temperature of the sample can be changed or kept constant. In order to reduce experimental errors caused by gas molecule collision and heat leakage, the vacuum inside the tubular electric furnace heater should be evacuated to 1 × 10-2Pa or above at room temperature using a turbo molecular pump or high vacuum unit before the experiment, and the tubular electric furnace heater should be carefully leak checked. The bottom of the tubular electric furnace heater has an adiabatic calorimeter. This measurement system is a multifunctional measurement system that has been redesigned based on the summary of the design, manufacturing, and use of many previous experimental devices. The structural principle is shown in the following figure.

4、 Main technical indicators of the system
1: Temperature range: Room temperature -1400.
2: Temperature control accuracy: ± 0.3K/30 minutes (depending on the setting)
3: Minimum temperature measurement resolution: 0.01K
4: Heating method: Resistance wire (or molybdenum wire).
5: Adopting intelligent PID regulation and program control.
6: Computer data collection throughout the entire process.
7: Vacuum degree can reach: calorimeter: less than 2 * 10-3 Pa. Heater: less than 5 Pa (user can specify according to sample requirements)
The standard is -0.1MPa
8: Test software Windows XP operating environment, Chinese operating interface
9: Sample size: diameter: 11mm, height: 30mm, powder sample with standard sample box.
10: The testing principle meets military standards: GJB330A-2000, GJB1715-93
11: Can be connected to the internet to achieve remote technical support, remote measurement and transmission