An integrally formed ceramic heating body and its preparation process

Abstract

The present invention relates to the technical field of preparation technology of a ceramic heating body, in particular to an integrally formed ceramic heating body and its preparation process. The integrally formed ceramic heating body is composed of 50-95% ceramic raw materials and 5-50% heating raw materials , the ceramic raw material is composed of 50‑95% Si 3 N 4 , 0.1-10% of MgO, 0.1-5% of Y 2 o 3 , 0.1‑5% Al 2 o 3 , 0.1‑5% SiO 2 , 0.1‑5% La 2 o 3 , 0.1‑5% BN composition, and the exothermic material is MoSi 2 , TiC or a mixture of two kinds; the preparation process of the ceramic heating body is mixing, ball milling, filtering, forming, pre-sintering, sintering, polishing and electrode connection processes. The manufacturing process is simple, which is conducive to continuous production and production. The efficiency is high, the production cost is low, and it is beneficial to realize large-scale production; the ceramic heating body of the present invention has long service life, stable power and high heating efficiency.

Description

technical field [0001] The invention relates to the technical field of preparation technology of a ceramic heating body, in particular to an integrally formed ceramic heating body and a preparation technology thereof. Background technique [0002] At present, the electric heating element of the traditional hair dryer is made of electric heating wire, which is installed at the air outlet of the hair dryer. Heating with a heating wire not only has a large radiation, but also the heating wire is in contact with air during the heating process, so it is easy to oxidize, and the heating wire will burn out after repeated power-on and power-off, and the service life is short. [0003] The heater is a forced convection heating device. The traditional heater uses a PTC heater for heating, and uses a fan to agitate air to flow through the PTC electric heating element to force convection, which is the main heat exchange method. However, the PTC heating element contains lead, and the im...

AI Technical Summary

Problems solved by technology

However, due to the obvious interface between the tungsten wire and the silicon nitride powder, it is difficult to integrate after sintering, and the tungsten wire is prone to short cracks during the production process of the product, or the resistance value changes during the sintering process, resulting in unstable product performance , the yield is low; moreover, at high temperature, the oxygen and nitrogen in the tungsten and silicon nitride composite ceramic matrix will react, resulting in unstable resistance value of the heating plate, poor service life, and thermal conductivity needs to be further improved; Therefore, the existing silicon nitride heating sheet is still difficult to solve the problem of oxidation of the heating wire and the problem of power attenuation of the PTC heating element.

In addition, the current manufacturing method of silicon nitride heating plate is mainly based on high temperature and high pressure process, which consumes a lot of energy, and the high temperature and high pressure furnace is a separate furnace body, which cannot realize continuous production, and the production efficiency is low. On the one hand, it cannot meet the strong demand of the market. On the other hand, it also essentially limits the reduction of large-scale production and cost