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An integrally formed ceramic heating body and its preparation process

A ceramic heating body, an integrated technology, applied in the field of preparation technology of ceramic heating body, can solve the problems of unstable product performance, easy short cracking of tungsten wire, low yield and other problems

Active Publication Date: 2016-11-30
广东国研新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] The preparation process of an integrally formed ceramic heating body in this embodiment includes the following process steps:

[0077] a. Mixing: first mix 70% Si by mass 3 N 4 , 9% MgO, 5% Y 2 o 3 , 5% Al 2 o 3 , 5% SiO 2 , 3% La 2 o 3 , 3% BN mixed and stirred evenly to make ceramic raw materials, and then 50% ceramic raw materials and 50% heating raw materials MoSi 2 Mix and stir evenly to make powder;

[0078] b. Ball milling: put the powder, grinding balls, water or alcohol prepared in step a into a ball milling tank for wet ball milling, and the time for wet ball milling is 8 hours;

[0079] c, filter and dry: carry out solid-liquid separation to the slurry after wet ball milling in step b, dry the powder after separation;

[0080] d. Hot die-casting molding: adding paraffin wax to the dried powder in step c, heating and stirring, stirring evenly to form a slurry, adding the slurry to a hot press for die-casting, and molding the powder to obtain a green ...

Embodiment 2

[0086] The preparation process of an integrally formed ceramic heating body in this embodiment includes the following process steps:

[0087] a, mixing: first mix Si with a mass percentage of 96% 3 N 4 , 1% MgO, 1% Y 2 o 3 , 0.5% Al 2 o 3 , 0.5% SiO 2 , 0.5% La 2 o 3 , 0.5% BN mixed and stirred evenly to make ceramic raw materials, and then 95% ceramic raw materials and 5% heating raw material TiC were mixed and stirred evenly to make powder;

[0088] b. Ball milling: put the powder, grinding balls, water or alcohol prepared in step a into a ball milling tank for wet ball milling, and the time for wet ball milling is 11 hours;

[0089] c, filter and dry: carry out solid-liquid separation to the slurry after wet ball milling in step b, dry the powder after separation;

[0090] d. Dry press forming: add the powder after drying in step c to a binder and mix and stir, mix evenly to form a powder, put the powder into a hydraulic press for dry press forming, and form the po...

Embodiment 3

[0096] The preparation process of an integrally formed ceramic heating body in this embodiment includes the following process steps:

[0097] a. Mixing: first mix Si with 80% mass percentage 3 N 4 , 6% MgO, 4% Y 2 o 3 , 4% Al 2 o 3 , 4% SiO 2 , 1% La 2 o 3 , 1% BN mixed and stirred evenly to make ceramic raw materials, and then 60% ceramic raw materials, 20% heating raw materials TiC, 20% heating raw materials MoSi 2 Mix and stir evenly to make powder;

[0098] b. Ball milling: put the powder, grinding balls, water or alcohol prepared in step a into a ball milling tank for wet ball milling, and the time for wet ball milling is 14 hours;

[0099] c, filter and dry: carry out solid-liquid separation to the slurry after wet ball milling in step b, dry the powder after separation;

[0100] d. Extrusion molding: add the powder after drying in step c to a binder and mix and stir, mix evenly to form a powder, put the powder into an extruder for extrusion molding, and mold t...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/584C04B35/622
Inventor 何峰斌陈闻杰张明军
Owner 广东国研新材料有限公司
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