The difference between MCH ceramic heating body and PTC electric heating heating body
MCH ceramic heating body and PTC electric heating heating body are two commonly used electric heating elements, which have obvious differences in heating principle, material, performance and use.
About the MCH ceramic heating body
1.MCH is short for Metal Ceramics Heater, which means metal ceramic heating body. MCH refers to the metal tungsten or molybdenum manganese and other high melting point metal heating resistance slurry in accordance with the requirements of heating circuit design printed on 92~96% of alumina cast ceramic billet, after thermal laminate, and then in about 1600℃ reduction atmosphere protection, ceramics and metal sintering of ceramic heating body, with corrosion resistance, high temperature resistance, long life, high efficiency and energy saving, uniform temperature, good thermal conductivity, fast thermal compensation speed, and no lead, cadmium, mercury, hexavalent chromium, polybromine biphenyl, polybromine ether and other harmful substances, meet the eu RoHS environmental requirements.
alias: MCH heating sheet, MCH ceramic heating sheet, metal ceramic heating sheet, alumina ceramic heating sheet, HTCC ceramic heating element, HTCC ceramic heating element heating component.
2. Main raw materials
Substrate: using white multi-layer alumina ceramic, а -Al2O3 content is not less than 95%
Lead: use Ф0.25mm, Ф0.3mm or Ф 0.5mm nickel wire
Cannula, tape: Teflon, high temperature tape
Resistance: tungsten and other high-temperature materials
Product thickness: 0.7~2.0mm Customizable
Use voltage: 3.7V-4.2V for customization
Selection of resistance value: between 0.3 and 100 ohms, according to the voltage, chip size, power and customer requirements.
3. Performance and characteristics (advantages and disadvantages)
1, simple structure, shape, size and resistance value power can be produced according to customer needs;
2. Good thermal uniformity, high power density: 45 W / cm2; specific heat capacity is about 840J / (KG * k)
3, resistance-temperature change linear, can be easily controlled by controlling the resistance or voltage temperature;
4. Rapid heating and fast temperature compensation;
500W power start 20S temperature above 600℃; its component rated power start 10S above 200℃;
5, high heating temperature, up to more than 700℃;
6. High thermal efficiency, uniform heating, energy saving (power consumption per unit is 20%~30% compared with PTC);
7, no open fire, surface safety and not charged;
Good insulation performance: the surface is safe and not charged: can be subject to 3700V / 1S withstand voltage test, leakage current 0.5 mA;
8, a long life, a long time to use without power attenuation;
9, heat tablet acid and alkali resistance and other corrosive substances;
10, environmental protection: does not contain lead, cadmium, mercury, hexavalent chromium, polybromide biphenyls, polybromide diphenyl ether and other harmful substances,
Fully comply with the EU environmental protection requirements.
The disadvantages are: used in different products in different fields have different shortcomings, the main disadvantages are as follows
1. Ceramic and fragile (not resistant to fall)
2. The temperature difference should not be too high (here is the temperature difference of sometimes hot and sometimes cold, the conventional heat physical capacity can reach within 450 degrees, and the special products can reach 800-1000 degrees)
3. Products cannot be made with special shapes. At present, it has been broken into the shape of a cup, and the bottom and surrounding can heat.
applied range:
Widely used in daily life, industrial and agricultural technology, communication, environmental protection, industrial processing equipment, electric adhesive, water oil and acid-alkali liquid heater, hairdresser (hair conditioner, hair curl), heater, cigarette lighter, electronic cigarette, incense furnace, heating and temperature, air conditioning, namely hot water heater, hot faucet such as rapid heating device, multi-function microwave oven, oven, clothes dryer, dryer, air conditioning, air fan, air cleaner, hot kettle, coffee pot, medical, infrared therapy, intravenous injection heater, etc.
Principle and function of PTC heater
PTC heater, also known as PTC heating body, is composed of PTC ceramic heating element and aluminum tube. This type of PTC heater has the advantages of small heat resistance and high heat transfer efficiency. It is an automatic constant temperature and power-saving electric heater. The outstanding feature is in the safety performance, any application will not produce such as electric heat pipe heater surface “red” phenomenon, thus causing burns, fire and other safety hazards.
It is composed of galvanized external pressure plate, stainless steel corrugated spring sheet, galvanized inner pressure plate, single layer aluminum heat sink, ptc heat sheet, double layer aluminum heat sink, nickel plated copper electrode terminal and pps high temperature plastic electrode sheath. Due to the use of u-type corrugated heat sink, the product improves its heat dissipation rate, and integrates the advantages of adhesive and mechanical, and fully takes into account the ptc heat parts, its strong combination, excellent thermal and heat dissipation performance, high efficiency, safety and reliability. This type of PTC heater has the advantages of small heat resistance and high heat transfer efficiency. It is an automatic constant temperature and power-saving electric heater. It is a prominent feature of the safety performance, namely the fan fault stop, PTC heater for not fully heat dissipation, its power will automatically drop sharply, the heater surface temperature maintained around the Curie temperature (generally in 250℃), thus not produce such as the surface of the electric heating pipe heater “red” phenomenon.
Principle of the ptc heater
Constant temperature heating PTC thermistor has the characteristics of constant temperature heating, its principle is that the PTC heating into the transition area after the heating, the constant temperature heating PTC thermistor surface temperature will maintain constant value, the temperature is only related to the Curie temperature and applied voltage of PTC thermistor, and has nothing to do with the ambient temperature. PTC heater is a heating device designed by using constant temperature heating PTC thermistor constant temperature heating characteristics. In small and medium power heating occasions, PTC heater has the advantages of constant temperature heating, no open fire, high thermal conversion rate, minimal affected by the power voltage, long natural life and other traditional heating components, the application in electric heating appliances is more and more favored by research and development engineers. Constant temperature heating PTC thermistor can be made into a variety of shapes and different specifications, common circular, rectangular, strip, ring and honeycomb porous. The above PTC heating elements and metal members can be combined to form various forms of high-power PTC heaters.
The PTC heater is divided by the conduction mode
(1) PTC ceramic heater with mainly heat conduction. Its characteristic is to transfer the heat generated by the PTC element to the heated object through the multilayer heat transfer structure such as the electrode plate (conductive and heat transfer) insulation layer (electric insulation and heat transfer) installed on the surface of the PTC heat transfer element) and the heat transfer plate.
(2) Various PTC ceramic thermal heaters for convection heat transfer with the formed heat air. It is characterized by large output power, and can automatically adjust the blowing wind moderate output heat.
(3) Infrared radiation heater. Its characteristics actually use the PTC element or heat conductivity plate surface quickly emitted heat directly or indirectly stimulate the far infrared paint or far infrared materials contacting its surface to radiate the infrared radiation, then constitutes the PTC ceramic infrared radiation heater.
PTC heater according to structural characteristics
(1) Ordinary practical type PTC ceramic heater. This kind of appliance mainly includes: electric heat mosquito repellent device, hand warmer, dryer, electric heating board, electric iron, electric flipping iron, electric thermal binder, curly hair perm and so on. It is characterized by small power, but high thermal efficiency is very practical.
(2) Automatic thermostatic type PTC heater. This kind of appliance mainly includes: small crystal device constant temperature trough, constant temperature incubator, electronic thermos bottle, thermal insulation box, thermos cup, heat preservation plate, heat preservation cabinet, heat preservation table, etc. It is characterized by automatic thermal insulation, simple structure, good constant temperature characteristics, high thermal efficiency, and wide ambient temperature range.
(3) Hot air, PTC heater. This kind of hot air PTC heater mainly includes: small warm air heater, hair dryer, heating machine, dryer, dry wardrobe, clothes dryer, industrial drying equipment, etc. It is characterized by large output hot wind power, fast heat, safety, and can automatically adjust the wind and moderate power consumption.
In conclusion, the difference between MCH ceramic heating body and PTC electric heating heating body is summarized as follows:
First of all, MCH aluminum oxide ceramic, PTC is lead, MCH is food grade heating body, is now used in the hot water dispenser. Direct contact with the water makes better use of the heat. MCH ceramic heating body is a kind of electric heating element based on ceramic materials. The heating principle is to migrate and collide through the electrons inside the ceramic material through the electric current, thus generating heat. Due to the high thermal efficiency, good thermal stability and long life of MCH ceramic heating body, it is widely used in various electric heating appliances and heating equipment.
The PTC electric heating heating body is a kind of electric heating element with the positive temperature coefficient thermistor as the core material. When the temperature reaches a certain value, the resistance value of PTC material will increase sharply, so as to realize the temperature automatic control and overheat protection. Due to the high safety performance, small volume and light weight of PTC electric heating heating body, it is widely used in a variety of small home appliances and intelligent devices.
In practical application, the selection of MCH ceramic heating body and PTC electric heating heating body also needs to consider the specific uses and scenarios. For example, while the MCH ceramic heating body has better stability and life, the PTC heating body has more advantages in small, lightweight and intelligent scenarios. Such as MCH ceramic heating is reflected in the realization of being placed in the thermos cup, and low pressure 3.7-5V, can achieve thermal insulation and heating effect, electronic cigarette, but also a large number of applications of MCH ceramic heating body.
Through the above analysis and comparison, MCH ceramic heating body and PTC electric heating heating body each have their own characteristics and advantages, and which kind of electric heating element needs to be decided according to the actual demand. At the same time, for the design and production of electric heating devices and heating equipment, it is also very important to understand and master the working principle and application characteristics of these two kinds of electric heating components, in order to choose and reasonable application.