Air-cooled vacuum sintering furnace

Air-cooled vacuum sintering furnace is introduced:
Air-cooled vacuum sintering furnace, by using the method of resistance heating can be achieved for rare earth permanent magnet sintering, purification of hydrogen storage material, electrical alloy bright annealing, brazing material such as stainless steel, precision alloy, tools, measuring and cutting, heat treatment. This equipment has high degree of vacuum, forced inside and outside air cooling circulation, cooling speed, mean temperature sex good, high automatic degree, etc.
Air-cooled vacuum sintering furnace use:
Cooled vacuum sintering furnace is a vacuum resistance is a new generation of vacuum heat treatment equipment. He has a high degree of vacuum, forced air cooling speed, high efficiency, good temperature, high degree of automation, etc. Legal system is mainly used for dry powder of vacuum sintering magnetic materials, hydrogen storage material of homogeneous purification and tools, precision alloy heat treatment, etc.
Air-cooled vacuum sintering furnace structure:
Air-cooled vacuum sintering furnace is horizontal structure, consists of furnace body, heating chamber, vacuum system, air cooled heat exchanger system, water cooling system, pneumatic system and electric control system components. Furnace for water-cooled wall structure, loading and temperature measuring thermocouple, etc. Heating chamber of the heating body made of molybdenum sheet, and selects the advanced thermal insulation material of incubator, heating process for the three sections of temperature control, can improve the temperature uniformity. Air-cooled heat exchanger by outer circulating system, after heated gas through a heat exchanger, blower driven, and back hot spray to the work, make its rapid cooling. Control system mainly consists of two parts, electric control cabinet and magnetic voltage regulator. Temperature is controlled by microprocessor program temperature recorder PC programmable controller and configuration actions of institutions, such as process control. Vacuum system adopts large pumping speed and dust catcher of high vacuum diffusion unit pump, diffusion pump, roots pump, vane pump.

Muffle furnace heating element

The heating element is an important member of the resistance furnace is a resistance furnace heat sources. Understand the performance, structure and characteristics of the heating element material, it is very important for the correct use of the resistance furnace.
Surface load of the heating element and the shape
Surface load of the heating element
When the current through the heating element, due to the role of the resistance of the heating element, the electrical energy into heat energy conversion law in line with Joule's law. Heating element electrical energy into thermal energy by heat conduction, convection and radiation distributed to the furnace, the ability to disseminate the surface load. The surface load of the heating element is defined as the power per unit area on the surface of the component can be distributed W/cm2. The larger the surface load of the heating element, the more heat comes out of the heating element itself, the higher the temperature. Consider increasing the element surface of the load may be correspondingly reduced surface area of ??the heating element, reducing the amount of heating elements, but is not conducive to the lifetime of the elements from the heating power of the resistance furnace. Conversely, reduced element of the surface load can be a corresponding increase in the surface area of ??the element, and is conducive to the lifetime of the elements, but increased the amount of the heating elements. In addition to the cooling effect of the surface load on the heating element, its shape also have a certain impact, in general, the ribbon components than the linear thermal conditions, the surface load.
Common shape of the heating element
The shape of the heating element depending on its material and installation, linear, spiral, mesh, ribbon and the rod-shaped structure, wherein the metal heating element is generally linear, spiral, a mesh or a ribbon, as opposed to metal heating element is generally rod. Linear heating elements in the oven cavity made of metal wire around certain requirements from the system; spiral heating element is wound into a spiral wire first and then install the oven cavity; mesh heating element wire braid and into; ribbon heating elements are made of metal directly processed into.

Optimization atmosphere furnace cooling rate

Traditional depends mainly on the furnace atmosphere furnace cooling water circulation inside the sandwich away part of the heat, the cooling speed is relatively slow. Sometimes up to 36h or so to cool to about 150 ℃.
The high-performance cores require rapid cooling, the design presented in the following optimization program:
(1) Cycle Air Act: cooling the charge into the furnace through the nitrogen to pour out of the tower, and then into the furnace, recycled. Meanwhile, in order to prevent leakage, to continue to add part of the nitrogen gas into the furnace to ensure the nitrogen partial pressure in the furnace.
(2) Box bottom openings, and the cold side of the silicon molybdenum rod gap forming gas convection, take away box furnace heat;
(3) The box-type furnace purged with nitrogen, the heat away sintered product;
(4) accelerate the rate of water flow within the furnace sandwich. These types of programs can be used simultaneously, the cooling time can be shortened to about 15h.

The range of application of the high-temperature furnace

High-temperature furnace is the national standard energy-saving cycle operating furnace, mainly for steel products, a variety of metal parts normalizing, hardening, annealing heat treatment purposes, or diamond cutting blade for high-temperature sintering purposes.
High-temperature furnace Precautions
In addition to doing the experiment, do not stay in the area of ??high-temperature furnace tube.
Experimental work is completed, if not continue to use special gas, close reserved N2 flow tube maintained at the standby temperature and see if there are other power the customs not related, such as: cleanhood light, boiling acid with a small electric furnace or other, please turn off.
Dealing with HF, gloves, such as accidentally ran into HF, immediately flush with calcium gluconate plus 2% water, rub the wound 15 '.
Quartz glass products be used with care, so as not to rupture, causing severe cuts.
Avoid inhalation of smoke from the stove or treatment tank of gas.
Potassium cyanide (KCN) can not be set, because the two can produce highly toxic KCN gas mixed with acids.
Once found to interfere with the security of things, please immediately notify the relevant personnel (technicians).
Please save the amount of pure water.
Broken wafer, filter paper, cotton swabs ....... Do not fall into the drainage holes at the bottom of the cleaning tank, so as not to cause the floor to waterlogging due to poor drainage.
Length of putting the front end, not to facing up to avoid contamination.
Wafer into the baked mouth, to undertake the holder of the boat, do not touch the tube mouth, to avoid contamination of the furnace tube.

Furnace charging into the furnace and power transmission

First, the charge into the furnace:
Charge into the blast furnace, electric furnace steelmaking operations plan should be based on the ingredients in a single audit charge weight and alloy elements and ingredients and feed weight pad in the bottom 1 to 2% of lime.
Top loading baskets have someone directing, opened the lid, it should promptly baskets hanging into the center of the furnace may not be too high, too biased and too low. In baskets of chain plate is not bad as far as sticky lower. For the second feeding, not other primary materials entirely of clear before feeding, to avoid spraying and splashing of molten steel, but also to prevent the explosion, humid charge non-loading of the material into several baskets.
After charging into the furnace, for excessive burden should flatten or hanging out, so as not to affect the fastening lid while preventing the lid was arcing and leakage.
Second, the power transmission:
Charge into the furnace after the power transmission before the deal lid, electrodes, cooling system, mechanical transmission, electrical equipment, etc. for inspection, if found to be timely treatment failure, resulting in the smelting process in order to avoid downtime; also check the charge with the door or cooling system is touching, if exposed to immediately exclude, in order to avoid transmission after breakdown.
If the electrode is not long enough, it is best replaced before the transmission, such as loose fitting location, should be tightened in order to facilitate a Chuanjing success, reducing downtime caused by the phenomenon of the smelting process.

What are the advantages and EAF what are the disadvantages

1) Compared with fuel stove is easy to get high.
2) can be heated to an internal temperature from the material.
3) facilitate the controlled atmosphere furnace and the vacuum furnace used.
4) no fuel furnace exhaust furnace heat loss, so high thermal efficiency.
5) is easy to control the temperature, to facilitate remote control and fine tune.
6) capable of rapid heating.
7) Operating performance is good, do not pollute the environment.
Furnace shortcomings
A) the need to increase distribution equipment costs.
2) high cost of electricity.
3) resistance when the heating temperature exceeds 1000 ℃, refractory materials may be electrically conductive, insulating problems need to pay attention.

Muffle furnace maintenance and repair

Be used again after the first time or long-term disabled muffle furnace, oven, furnace temperature of 200 ° C to 600 ° C for four hours is appropriate
2, long-term use muffle furnace temperature shall not exceed the maximum temperature.
3, muffle furnace and controller ambient temperature 0 to 50 ° C, relative humidity not more than 90% of the non-conductive dust, no explosive gas and corrosive gases in the workplace.
4, perfusion liquid and molten metal to muffle furnace hearth is prohibited.
Replacement muffle furnace wire, first remove the furnace chimney, open the furnace tailgate, remove the intermediate insulating brick stoves can be extracted for a good furnace wire, and then still installed
6 muffle furnace door lighter off light on, to prevent damage to the parts.
To extend the life of the muffle furnace and ensure safety after the end of the muffle furnace use should be promptly removed from the muffle furnace furnace samples, exit the heating and turn off the power.