Resistance Heating Heat Treatment Furnace

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Resistance heating heat treatment furnace is a widely used heating equipment in heat treatment production. It uses electric current to generate heat through electric heating elements arranged in the furnace, and transfers heat to the workpiece by means of radiation or convection, so that the workpiece heats the furnace. All kinds of heat treatment furnaces that use metal and non-metal electric heating elements as heating elements belong to this type of furnace.

1. Advantages of Resistance Heating Heat Treatment Furnace

(1) Low temperature, medium temperature and high temperature space can be formed according to the production, and higher temperature uniformity can be obtained.

(2) The furnace body of the heat treatment furnace has a compact structure, which is convenient to be sealed to implement the vacuum heat treatment process or enter a controllable atmosphere.

(3) It is easier to realize automatic control of temperature and process.

2. Heating Element Material of Resistance Heating Heat Treatment Furnace

Because the resistance heating heat treatment furnace is in a vacuum state, the heating element transfers heat to the workpiece in the form of heat radiation. In addition, the volatilization speed of the heating element is higher than that of an ordinary electric furnace. When designing the material of the heating element in the vacuum heat treatment furnace, it is necessary to consider: select materials with higher resistivity; small temperature coefficient of resistance; sufficient high-temperature mechanical strength; small thermal expansion coefficient; not compatible with the protective atmosphere and furnace lining in the furnace, etc. Chemical reaction occurs; heat resistance; easy processing, etc. In addition, the heating element material must be selected after comprehensive consideration of specific factors such as the temperature, structure, process requirements, and economy of the vacuum heat treatment furnace.

The heating elements in the resistance heating heat treatment furnace can be divided into two types: metal and non-metal according to different materials. The materials used for metal heating elements are: nickel-chromium alloy, iron-chromium aluminum alloy, platinum, molybdenum, tungsten, tantalum, etc.; non-metallic heating elements are: silicon carbide, molybdenum dioxide, graphite, etc. The types and characteristics of commonly used electric heating materials in vacuum resistance furnaces are shown in Table 1.

Type		Variety	Maximum furnace temperature (℃)	Features and uses
Metal	Nichrome	Cr20NiBO Cr15NiS0	1050 900	The resistivity is high, and the temperature coefficient of resistance is small. Good processability. Good high temperature strength. Non-magnetic
	Nickel-chromium aluminum alloy	0Cr25Ai5 0Cr27ANi 0Cr27A17M o2	1100 1200 1300	Good oxidation resistance, high use temperature, high electrical resistivity, low temperature coefficient of resistance, low cost, poor high temperature strength, slightly poor processability, and magnetic
	Refractory metal	Pt Mo Ta W	1500 1800 2200 2400	High operating temperature, easy to oxidize except platinum, low resistivity, large temperature coefficient of resistance, poor processability, and expensive
Non-metal	Silicon carbide		1350	The use of high temperature, good oxidation resistance, cheap. The resistance consistency between components is poor, easy to aging, new and old components are not easy to match, brittle, easy to break
	Molybdenum dioxide		1600	High operating temperature, anti-oxidation, cheap and brittle at room temperature, softening above 1300C
	Graphite		3000	The use temperature is high. Low resistivity, easy to oxidize

Table 1 Types and characteristics of commonly used electric heating materials in resistance heating heat treatment furnaces

3.Product Parameter

Model	Effective Working Zone	Heating Power	MAX Temperature	Temp uniformity	Ultimate Vacuum	Pressure Rising Rate	Pressure
RVH-100	Ф280×400mm	100Kw	2000℃	±5℃	6*10-3Pa	0.6Pa/H	100T
RVH-150	Ф380×400mm	120Kw	2000℃	±5℃	6*10-3Pa	0.6Pa/H	150T
RVH-250	Ф480×500mm	150Kw	2000℃	±5℃	6*10-3Pa	0.6Pa/H	250T

Shanghai Geheng Vacuum Technology Co., Ltd. is a vacuum heat treatment furnace manufacturer with many years of experience in design, manufacturing and production. Mainly produce vacuum heat treatment furnace, vacuum sintering furnace, vacuum brazing furnace, New Energy And Environmental Protection Equipment and other vacuum equipments.Provide customized services, equipment work area can be based on customer output.