Ceramic-base wave-permeation supporting body used for microwave heating and producing method thereof

A technology of microwave heating and production method, applied in the field of ceramic-based wave-transmitting carriers, can solve problems such as low dielectric constant, and achieve the effects of good processing performance, good practicability and adaptability

Inactive Publication Date: 2008-01-09
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that for the development of microwave heating devices, there is a general lack of extremely high microwave transmittance; low dielectric constant and low dielectric loss; good thermal conductivity; strong thermal shock resistance; good mechanical strength and Hardness; high density, good air tightness; good machinability, easy for large-scale processing and low-cost high-temperature carrier for microwave ovens, especially for large-scale products used in industrial microwave heating equipment, has become a microwave high-temperature heating The technical bottleneck of equipment for multi-functional, large-scale and industrial applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] Example 1: The industrial ceramic raw materials MgO, Al 2 O 3 and SiO 2 According to the ratio of 6%, 40% and 54%, and add 5% of the total weight of clay as a binder, grind it to 20-200 mesh in a ball mill, of which 60-120 mesh accounts for 40%. After mixing evenly, use steel Die in uniaxial 1000-1300kg / cm 2 Pressed into a saggar body under pressure, the inner size (length × width × height) is 300 × 300 × 250 mm, the wall thickness is 15 mm, and the bottom thickness is 20 mm. In the atmospheric atmosphere, preheat at 100-150 °C for 5 hours, slowly heat to 1700 °C at a rate of 1 °C / min, and keep sintered in the atmosphere for 3 hours to prepare the required wave-transmitting saggar. The microwave dielectric properties of the product were measured by the resonant cavity perturbation method, and the thermal expansion coefficient, thermal shock resistance and strength were evaluated with reference to relevant standards.

[0017] After testing, the characteristics of the...

example 2

[0018] Example 2: The industrial ceramic raw material Y 2 O 3 , Al 2 O 3 and SiO 2 Mix and add 6% of the total weight of clay according to the ratio of 4%, 36% and 60%, grind it to 20-200 mesh by ball mill, of which 60-120 mesh accounts for 50%, after fully mixing, use a wooden mold to vibrate The tube body is made with the help of the rod, the inner size (diameter×height) is 430×1500mm, the wall thickness is 20mm, after drying at room temperature for 60h to 6% by weight of water, it is demolded, and it is hoisted into the furnace. In the atmosphere, 100-150 Preheat at ℃ for 8-10h, slowly heat to 600℃ for 2h at a rate of 1℃ / min, then heat to 1680℃ at a rate of 2-3℃ / min, and sinter in the atmosphere for 5h to prepare the required Large size wave-transmitting ceramic carrier tube. The microwave dielectric properties of the product were measured by the resonant cavity perturbation method, and the thermal expansion coefficient, thermal shock resistance and strength were eval...

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PUM

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Abstract

This invention relates to a ceramic-based wave-permeable loading body used in micro-wave heating conditions. The components of this invention products have the representation of: xMeO.yAl2O3.zSiO2, wherein Me=magnesium or yttrium, and the specific (weight percentages) of the components: 2%<=x<=8; 35%<=y<=45%; 50%<=z<=60%, and x+y+z=100%. After that, it is added with adhering agent of 5-8% of the total raw materials above-mentioned, and making blanks and being sintered to obtain final products. This inventive products have advantages of: dielectric constant=6-10, very low expansibility during heating, excellent thermal shock-resistance, its softening point during loading>=1600deg.C, can be used for making tubes, plates, bricks and crucibles.

Description

1. Technical field: [0001] The invention relates to a ceramic-based wave-transmitting carrier for microwave heating equipment, more specifically, a formula and a metallurgical production method for a special ceramic-based carrier for microwave wave-transmitting in a microwave field. 2. Technical background: [0002] Microwave heating is a new technology developed in the early 1940s. Unlike conventional heating, microwave heating does not require heat conduction from the surface to the inside, but directly heats the material through the energy dissipation of the microwave in the material. According to the different electromagnetic properties of the material, heat can be generated in the entire material in a timely and effective manner. The application of microwave heating in metallurgy has the following advantages that cannot be compared with conventional heating methods: selective heating of materials, fast heating rate, high heating efficiency; catalysis of chemical reactio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/18
Inventor 彭金辉郭胜惠张世敏张利波张泽彪
Owner KUNMING UNIV OF SCI & TECH
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