Silicon carbide based composite microwave-absorbing heating body composition and preparation method thereof

A composite material and microwave absorption technology, applied in the field of composite materials, can solve the problems of easy oxidation at the joint, difficult to form a special atmosphere, consumption, etc., and achieve the effect of improving mechanical properties and improving microwave absorption performance.

Inactive Publication Date: 2015-02-11
XIAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, Chinese patent CN102795868A "a boron nitride-boron carbide-graphite composite heating element for high-temperature electric heating", Chinese patent CN102625504A "high-temperature zirconium boride ceramic heating element and its preparation method", Chinese patent CN1090562 "ultra-high temperature ceramic Heating element and its manufacturing method", Chinese patent CN102964125A "a preparation method of an electric heating ceramic heating element in an ultra-high temperature oxidation environment", Chinese patent CN1865191 "ultra-high temperature molybdenum disilicide zirconia composite heating element and its preparation method" , Chinese patent CN201188692 "heating element for high-temperature furnace", Chinese patent CN1865191 "ultra-high temperature molybdenum disilicide zirconia composite heating element and its preparation method", Chinese patent CN201947470U "an ultra-high temperature boride composite ceramic heating element" and other recent applications Composite material heating element, the use temperature and use conditions have been greatly improved, but it is still limited to resistance heating
From the point of view of use, the traditional heating element has the following problems compared with the heating element of the present invention: 1. The power line should be connected to the heating element, and there is resistance and heat at the connection part, which makes the connection easy to oxidize and arc to burn the connecting wire; 2. While the heating element is working, the conductive end needs to pass through the heat preservation area, and a certain amount of electric energy is consumed at the conductive end in the heat preservation area, so that the active power is reduced; 3. The heating element cannot form an independent space because it needs to be connected with an external power supply, which is relatively It is difficult to form a special atmosphere (such as an inert atmosphere, a vacuum atmosphere, etc.); 4. The heating shape and installation lack flexibility, and a fixed installation mode is generally used; 5. The heating space formed by the heating element cannot be completely isolated from the outside world, and the thermal insulation performance is poor , higher energy consumption
[0003] Considering the cost, performance, process, etc., up to now, no one has been found that not only has good microwave absorption performance at civilian frequencies, but also can quickly generate heat and can adapt to different application conditions.
Composite wave-absorbing heating element and preparation method with low manufacturing cost and simple production process have not been reported yet.

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  • Silicon carbide based composite microwave-absorbing heating body composition and preparation method thereof

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Embodiment 1

[0044] The silicon carbide-based composite material absorbing microwave heating element composition of this embodiment is made of the following mass fractions of raw materials: 90 parts of main agent, 10 parts of modifier; 3 parts of binder, 7 parts of water; Silicon carbide powder with an average particle size of 95 μm, the modifier is 7 parts, a mixture of alumina powder with an average particle size of 40 μm, and 3 parts of silica powder with an average particle size of 50 μm, and the binder is 3 parts of polyethylene Alcohol, the solvent is 7 parts distilled water.

[0045] Reference figure 1 As shown, the preparation method of the silicon carbide-based composite material absorbing microwave heating element composition of this embodiment is carried out in the following steps:

[0046] Step 1. Ball milling: Add the main agent, modifier, binder and water in proportions to the ball mill and mix evenly to obtain a mixture;

[0047] Step two, stale: the mixture described in step ...

Embodiment 2

[0053] In this embodiment, the silicon carbide-based composite material absorbing and heating element is made of raw materials with the following mass fractions: 85 parts of main agent, 15 parts of modifier; 5 parts of binder and 8 parts of water; the main agent is the average particle size It is a 60μm silicon carbide powder, the modifier is a mixture of 9 parts of alumina powder with an average particle size of 40μm and 6 parts of titanium oxide powder with an average particle size of 35μm, the binder is 5 parts of hydroxymethylcellulose, The solvent is 8 parts of distilled water.

[0054] Combine figure 1 , The preparation method of the silicon carbide-based composite material wave-absorbing heating element of this embodiment:

[0055] Step 1. Ball milling: Add the main agent, modifier, binder and water to the ball mill and mix evenly to obtain a mixture;

[0056] Step two, staleness: heat the mixture described in step one at 25°C for 40 hours for staleness treatment;

[0057] Ste...

Embodiment 3

[0062] In this embodiment, the silicon carbide-based composite material absorbing and heating element is made of the following mass fractions of raw materials: 88 parts of main agent, 12 parts of modifier; 6 parts of binder and 28 parts of water; the main agent is the average particle size It is 100 μm silicon carbide powder, the modifier is a mixture of 7 parts of feldspar powder with an average particle size of 50 μm and 5 parts of silica powder with an average particle size of 50 μm, the binder is carboxymethyl starch, and the solvent is distilled water.

[0063] Combine figure 1 , The preparation method of the silicon carbide-based composite material wave-absorbing heating element of this embodiment:

[0064] Step 1. Ball milling: Add the main agent, modifier, binder and water to the ball mill and mix evenly to obtain a mixture;

[0065] Step two, staleness: the mixture described in step one is sealed and kept at a temperature of 25°C for 40 hours for stale treatment;

[0066] Ste...

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Abstract

The invention discloses a silicon carbide based composite wave-absorbing heating body composition and a preparation method thereof. The heating body composition is prepared from the raw materials in parts by mass: 75-95 parts of main agent, 5-25 parts of modifier, 1-6 parts of additive binder and 5-50 parts of water; the preparation method of the silicon carbide based composite wave-absorbing heating body composition comprises the following steps: carrying out ball milling to mix the materials; ageing; molding; drying; and sintering. The silicon carbide based composite wave-absorbing heating body composition disclosed by the invention has good microwave absorbing and rapid heating performance in the civilian band (2.45GHz). The wave-absorbing heating body composition can be processed into various shapes according to the needs of sintered products, is simple in production process, low in production cost, wide in use temperature range, good in high-temperature oxidation resistance, extensive in use and easy in the forming of different atmospheres, can meet the requirements of products of different types on sintering and is extensively used as heating elements of various high-temperature furnaces.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a silicon carbide-based composite material absorbing microwave heating element composition and a preparation method thereof. Background technique [0002] Silicon carbide has the advantages of good semiconducting properties, high temperature resistance, low density, excellent mechanical properties, low price, and huge output. It is a very promising material for absorbing and heating elements. At present, the research on heating elements is mainly based on resistive heating elements processed by metals or alloys, silicon carbide, metal oxides, molybdenum disilicide, and graphite. These types of heating elements, such as commonly used metal or alloy heating elements, the main disadvantages of metal electric heating materials are expensive and harsh use conditions. Among them, refractory metal electric heating materials must be used in vacuum or protective at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/634C04B35/622
CPCC04B35/565C04B35/63416C04B35/636C04B35/6365C04B2235/3206C04B2235/3208C04B2235/3217C04B2235/3232C04B2235/3244C04B2235/3418C04B2235/3463C04B2235/349C04B2235/606C04B2235/656C04B2235/658
Inventor 李小池李元超
Owner XIAN UNIV OF SCI & TECH
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