A silicon carbide-based composite material absorbing microwave heating element composition and its preparation method

A composite material and microwave-absorbing technology, which is applied in the field of composite materials, can solve problems such as easy oxidation of joints, difficulty in forming a special atmosphere, heat generation shape, and lack of flexibility in installation, so as to achieve the effect of improving mechanical properties and microwave absorption performance

Inactive Publication Date: 2016-05-18
XIAN UNIV OF SCI & TECH
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  • Summary
  • 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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  • A silicon carbide-based composite material absorbing microwave heating element composition and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0044] In this embodiment, the silicon carbide-based composite material absorbing microwave heating element composition is made of the following raw materials in mass fractions: 90 parts of main agent, 10 parts of modifier; 3 parts of additional binder, 7 parts of water; Silicon carbide powder with an average particle size of 95 μm, 7 parts of the modifying agent, 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 of distilled water.

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

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

[0047] Step 2, stale: heat...

Embodiment 2

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

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

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

[0056] Step 2, stale: heat the mixture described in step 1 at 25°C for 40 hours for stale treatment;

[0...

Embodiment 3

[0062] The wave-absorbing and heating element of silicon carbide-based composite material in this embodiment is made of the following raw materials in mass fraction: 88 parts of main agent, 12 parts of modifier; 6 parts of additional binder, 28 parts of water; the main agent is the average particle size 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 silicon dioxide 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 silicon carbide-based composite material wave-absorbing heating element in this embodiment:

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

[0065] Step 2, aging: the mixture described in step 1 is sealed and kept for 40 hours at a temperature of 25°C for ag...

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Abstract

The invention discloses a silicon carbide-based composite material wave-absorbing heating element composition and a preparation method thereof. The heating element composition consists of 75-95 parts of a main agent, 5-25 parts of a modifier; 1-6 parts An external binder is composed of 5-50 parts of water; the method for preparing the silicon carbide-based composite wave-absorbing heating element includes the following steps: ball milling and mixing; aging; forming; drying; and sintering. The microwave-absorbing heating element of the silicon carbide-based composite material of the present invention has good microwave-absorbing and rapid-heating performance in the civilian band (2.45G Hz). The absorbing heating element can be processed into various shapes according to the needs of sintered products, and the production process is simple, the production cost is low, the use temperature range is wide, the high temperature oxidation resistance is good, the application is wide, and it is easy to form different atmospheres, which can meet the sintering of different types of products It is widely used as heating element 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 Patents(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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