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

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

Inactive Publication Date: 2009-10-21
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 Mix according to the ratio of 6%, 40% and 54%, and add 5% of the total weight of clay as a binder, and grind it to 20-200 mesh by ball mill barrel, of which 60-120 mesh accounts for 40%. After mixing evenly, use steel Die in uniaxial 1000-1300kg / cm 2 Pressed under pressure to form a sagger embryo body, the inner size (length × width × height) is 300 × 300 × 250mm, the wall thickness is 15mm, and the bottom thickness is 20mm. In the atmosphere, preheat at 100-150°C for 5 hours, slowly heat up to 1700°C at a rate of 1°C / min, and keep warm and sinter for 3 hours in the atmosphere to prepare the required wave-transparent sagger. The microwave dielectric properties of the product are measured by the resonant cavity perturbation method, and the thermal expansion coefficient, thermal shock resistance and strength are evaluated with reference to relevant standards.

[0017] After testing, the characteri...

example 2

[0018] Example two: the industrial ceramic raw material Y 2 o 3 、Al 2 o 3 and SiO 2 Mix according to the ratio of 4%, 36% and 60%, add 6% of the total weight of clay, and grind it to 20-200 mesh by ball mill barrel, of which 60-120 mesh accounts for 50%. After mixing well, use wooden mold to vibrate With the assistance of rods, the tube embryo body is made, and the inner dimension (diameter × height) is Wall thickness 20mm, dry at room temperature for 60 hours until the water content is 6% by weight, demould, hang into the furnace, preheat at 100-150°C for 8-10h in the atmosphere, slowly heat to 600°C at a rate of 1°C / min and keep for 2 hours , and then heated to 1680° C. at a rate of 2-3° C. / min, and sintered in the air atmosphere for 5 hours to prepare the required large-size wave-transparent ceramic carrier tube. The microwave dielectric properties of the product are measured by the resonant cavity perturbation method, and the thermal expansion coefficient, thermal sh...

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PUM

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Abstract

The invention relates to a ceramic-based wave-transparent carrier for microwave heating and a production method thereof. The composition of the ceramic-based wave-transparent material of the invention is expressed as xMeO·yAl2O3·zSiO2, wherein Me is magnesium or yttrium, and the composition of each component is The specific content is 2% by weight≤x≤8% by weight, 35% by weight≤y≤45% by weight, 50% by weight≤z≤60% by weight, x+y+z=100%, and the total weight of the mixed materials is 5-8 % binder, sintered after embryo forming. The dielectric constant of the material is 6-10, which has good microwave penetration performance; its thermal expansion coefficient is 2-3×10-6 / ℃ at 20-1000 °C, with extremely small thermal expansion rate and excellent resistance Thermal shock performance; at the same time, its load softening temperature is ≥1600°C, which can meet the technological requirements of microwave high-temperature synthesis, sintering, calcination and heat treatment; the carrier can adapt to the processing of large-scale tubes, plates, bricks, saggers, crucibles and special-shaped parts, etc. Require.

Description

1. Technical field: [0001] The invention relates to a ceramic-based wave-transparent carrier used for microwave heating equipment, more precisely, it relates to a formula and a metallurgical production method of a ceramic-based carrier specially used for microwave-transparent waves in a microwave field. 2. Technical background: [0002] Microwave heating is a new technology developed in the early 1940s. Microwave heating is different from conventional heating. It does not need heat conduction from the surface to the inside, but directly heats the material through the energy dissipation of microwaves inside 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, and high heating effi...

Claims

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Application Information

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Patent Type & Authority Patents(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