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Heating element and preparation method thereof

A heating element and heating element technology, which is applied to heating element materials, ohmic resistance heating parts, tobacco, etc., can solve the problems of insufficient strength and toughness of heating elements, indirect heat conduction process, and easy fluctuation of product performance, so as to avoid the printing environment. and printing conditions, good economy, controllable material ratio

Pending Publication Date: 2021-11-02
HUBEI CHINA TOBACCO IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the applicant found that the MCH ceramic heating element has the following problems: 1) The ratio formula of the metal paste, preparation speed, storage time, printing environment, printing conditions and firing environment factors will affect the performance of the cermet heating element. Resistance and TCR (temperature coefficient of resistance) electrical indicators, so that the product performance is easy to fluctuate; 2) The heating element is not strong enough, easy to be damaged, and the actual life is low; 3) The heat is transferred to the oxide ceramic through the Joule heat of the metal Then conduct to the tobacco, the heat conduction process is not direct, which affects the heating efficiency; 4) The circuit is not uniformly covered on the alumina substrate, and the uniformity is not good during use; 5) The manufacturing process is complicated, difficult to control, and the cost is high

Method used

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  • Heating element and preparation method thereof
  • Heating element and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The heating element S1 was prepared by the following steps:

[0036] (1) Mix Si powder and Fe powder for ball milling, the atomic ratio of Si and Fe powder is 3:1, the ball milling speed is 200rpm, the ball milling time is 10h, the ball milling atmosphere is high-purity argon, and the ball-material ratio is 10:1 to obtain metal silicide thing;

[0037] (2) The obtained metal silicide powder and non-conductive ceramic powder are mixed and ball milled, the mass percentage of the two is 0.1:1, the ball milling speed is 50rpm, the ball milling time is 6h, the ball milling medium is absolute ethanol, and the ball-to-material ratio is 5:1 ;

[0038] (3) Dry the powder slurry after ball milling in a vacuum drying oven, the vacuum degree is lower than 0.1Pa, the heating temperature is 30°C, and the drying time is 1h;

[0039] (4) Press the dried mixed powder on a press into a fluted sheet with a length of 15mm, a width of 1.2mm, and a thickness of 1mm, wherein the length of t...

Embodiment 2

[0044] Prepare the heating element S2 through the following steps:

[0045] (1) Mix Si powder and Cr powder for ball milling, the atomic ratio of Si and Cr powder is 0.5:1, the ball milling speed is 600rpm, the ball milling time is 100h, the ball milling atmosphere is high-purity argon, and the ball-to-material ratio is 30:1 to obtain metal silicide;

[0046] (2) The obtained metal silicide powder and non-conductive ceramic powder are mixed and ball milled, the mass percentage of the two is 5:1, the ball milling speed is 500rpm, the ball milling time is 48h, the ball milling medium is absolute ethanol, and the ball-to-material ratio is 10:1 ;

[0047] (3) Dry the powder slurry after ball milling in a vacuum drying oven, the vacuum degree is lower than 0.1Pa, the heating temperature is 150°C, and the drying time is 10h;

[0048] (4) Press the dried mixed powder into a grooved prism with a length of 30 mm, a width of 2 mm, and a thickness of 1.2 mm, wherein the length of the g...

Embodiment 3

[0053] Prepare the heating element S3 through the following steps:

[0054] (1) Mix Si powder with Mo and V powder for ball milling, the atomic ratio of Si, Mo and V is 5:1:1, the ball milling speed is 400rpm, the ball milling time is 42h, the ball milling atmosphere is high-purity argon, 20:1 to get metal silicide;

[0055] (2) The obtained metal silicide powder and non-conductive ceramic powder are mixed and ball milled, the mass percentage of the two is 2:1, the ball milling speed is 200rpm, the ball milling time is 32h, the ball milling medium is absolute ethanol, and the ball-to-material ratio is 7:1 ;

[0056] (3) Dry the powder slurry after ball milling in a vacuum drying oven, the vacuum degree is lower than 0.1Pa, the heating temperature is 120°C, and the drying time is 2h;

[0057] (4) Press the dried mixed powder into a cylindrical shape with a length of 25mm and a bottom diameter of 2mm with grooves on a press, wherein the length of the groove is 21mm, the width ...

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Abstract

The invention belongs to the technical field of novel tobaccos, and particularly relates to a heating element and a preparation method thereof. The heating element comprises a heating body and an insulating filler arranged in the heating body. Wherein the heating body is made of metal silicide and non-conductive ceramic, and the mass ratio of the metal silicide to the non-conductive ceramic is (0.1: 1)-(5: 1). The problem that the heating performance fluctuation difference of the heating assembly in the production process is large is solved, and the rate of finished products is greatly increased; and meanwhile, the heating element prepared by the method disclosed by the invention has better bending strength and fracture toughness, so that the service life of the heating element is prolonged.

Description

technical field [0001] The invention belongs to the technical field of novel tobacco, and in particular relates to a heating element and a preparation method thereof. Background technique [0002] Low-temperature tobacco uses various heat sources to heat special tobacco to produce tobacco-flavored gas. Compared with traditional cigarettes, the temperature of smoke generated is lower, usually below 350°C, so it can greatly reduce the harmful substances produced by tobacco during combustion , greatly reducing the possible harm to the human body. [0003] At present, the electric heating method of the MCH ceramic heating element is generally used in low-temperature tobacco appliances. The MCH ceramic heating element is made of tungsten, manganese and other alloy powders together with organic solvents to form a metal paste, and then the metal paste is printed on the alumina ceramic green body as an insulating medium by a screen printing machine, and then in a reducing atmospher...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/06C04B35/10C04B35/48C04B35/565C04B35/581C04B35/584C04B35/622H05B3/02H05B3/12A24F40/46
CPCC01B33/06C04B35/10C04B35/48C04B35/565C04B35/581C04B35/584C04B35/622H05B3/12H05B3/02A24F40/46
Inventor 刘华臣谭健吴聪唐良颖黄婷
Owner HUBEI CHINA TOBACCO IND
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