Electric heating device with plasma-sprayed stainless steel tube

Abstract

The invention discloses an electric heating device with a plasma-sprayed stainless steel tube. The electric heating device comprises the stainless steel tube; a medium layer is sprayed on the outer circumferential surface of the stainless steel tube in a plasma spraying manner, a resistance layer is sprayed on the outer surface of the medium layer in a plasma spraying manner, an encapsulation layer is sprayed on the outer surface of the resistance layer in a plasma spraying manner, and the resistance layer is provided with an electrode exposing out of the encapsulation layer; the medium layer is a ceramic or glass powder layer; the resistance layer is a molybdenum powder layer, a niobium powder layer, a nickel powder layer, a molybdenum alloy powder layer, a niobium alloy powder layer or a nickel alloy powder layer; the encapsulation layer is a ceramic or glass powder layer. The electric heating device disclosed by the invention adopts a low-cost plasma spraying technology for spraying to form the medium layer, the resistance layer and the encapsulation layer, the production material cost is low, the production efficiency is high, the production efficiency and the product qualification rate can be effectively improved in manners of direct powder spraying and one-time forming, the bonding force among the medium layer, the resistance layer and the encapsulation layer is strong, and the product stability and reliability are good.

Description

technical field [0001] The invention relates to the technical field of electrothermal materials, in particular to a plasma sprayed stainless steel tube electrothermal device. Background technique [0002] Plasma spraying is a thermal spraying method that uses a rigid plasma arc as a heat source and mainly sprays powder materials. Plasma arc is the abbreviation of plasma arc; plasma refers to the formation of positive and negative ions ( Electrons) An electrical conductor that has an equal number and is electrically neutral as a whole. The arc itself is plasma, but only when the arc is compressed by the thermal contraction effect, self-magnetic compression effect, and mechanical compression effect to become a compressed arc with a higher temperature, it is called a plasma arc, and its center temperature can reach 10,000°C -50000℃, such a high temperature enables all metal and ceramic materials to be sprayed. [0003] Further explanation is required. Plasma spraying technolo...

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Problems solved by technology

[0004] It should be further pointed out that the dielectric layer of the existing thick-film electric heating device is mainly completed by repeated screen printing / sintering glass glaze on stainless steel substrates, ceramic substrates, and glass substrates. The production efficiency is low, the cost is high, and product defects are difficult to control. Limited selection, hard to improve performance

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