As a commonly used heating equipment in the laboratory, high-temperature furnace is widely used in sintering, melting, heating, heat treatment, etc., and the main parts of the high-temperature furnace such as thermal insulation materials, heating elements, thermocouples, and multi-stage temperature control programsThe comprehensive understanding and mastery of control methods helps us reasonably select, manufacture and use energy-saving, intelligent and safe high-temperature furnaces, and improve the quality of heating products by using high-temperature furnaces.

The following explains the characteristics of high-temperature furnaces in the manufacture and use of many aspects from a specific introduction:

一、Refractory materials

(1) The continuous improvement of the performance of commonly used refractory insulation materials, and new thermal insulation materials such as carbon fiber.

(2) The use of light high-temperature refractory materials such as alumina fiber, the weight of high-temperature furnaces is greatly reduced, reducing the original weight of 1/5-1/3

(3) Carbon fiber felt on the high-temperature furnace is a high-temperature thermal insulation material with excellent performance made of carbon fiber needle punched into felt, pre-oxidation, carbonization, graphitization and other production processes.

(4) Under vacuum and inert atmosphere, the small operating temperature of carbon felt* can reach 2500 °C or even withstand 3000 °C high temperature.

(5) Carbon fiber felt, blanket and board made of carbon fiber have the characteristics of high heat resistance, high temperature resistance, good heat insulation, light weight, soft texture and corrosion resistance, which is an ideal thermal insulation material for high-temperature furnaces.

(6) Alumina fiber is an inorganic material with AL2O3 content of up to 95%-97%, and the maximum temperature reaches 1800 °C.

(7) With excellent high temperature mechanical properties and chemical erosion resistance, no other atmosphere conditions, aluminum silicate fiber is generally used only 1200 °C, effective service life is 4-5 years, polycrystalline alumina fiber can be used for 1200-1700 °C.

(8) It is made of light and heat-insulated alumina fiber cloth, felt, bench refractory fiber with excellent heat resistance, high strength and corrosion resistance, which meets the various temperature requirements of the laboratory for high-temperature furnaces.

(9) Thermal insulation materials have an important impact on the rise and maintenance of furnace temperature, determine the utilization efficiency of high-temperature furnace thermal energy and the temperature difference of each part of the furnace, determine the energy consumption during high-temperature furnace heating, and relate to the safety and use performance of refractory masonry and furnace building structure.

(10) Therefore, it is required that the thermal insulation material has low thermal conductivity, good thermal insulation performance, large resistivity, electrical insulation energy consumption, does not hinder the discharge of furnace gas, does not react with furnace products at high temperature, is cheap and easy to purchase heating elements in large quantities.

(11) The heating elements of the high-temperature furnace are: resistance wire, silicon carbon rod, silicon molybdenum rod.

(12) They have high thermal efficiency, strong corrosion resistance, long life, and the resistance wire generally used in laboratory high temperature is iron-chromium-aluminum, nickel-chromium, nickel-chromium, nickel-chromium and other high-resistance alloy wires.

(13) Generally, the maximum use temperature does not exceed 1300 degrees Celsius, they have high resistivity, and the temperature coefficient of resistance is small.

(14) Good machining and welding performance with oxidation resistance, high strength at high temperature, can be processed into various sizes and shapes.

(15) Good corrosion resistance at high temperature, especially suitable for use in atmospheres containing sulfur and sulfides, and low price, suitable for special * electric furnaces, laboratory electric furnaces and various chamber high temperature furnaces.

(16) Silicon carbon rod is a rod-shaped non-metallic high-temperature electric heating element made of silicon carbide as the main raw material, processed into blanks, high-temperature siliconization and recrystallization, and metal