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Magnesium silicate ceramic wave-transparent material and preparation method thereof

A wave-transparent material, magnesium silicate technology, applied in functional ceramic materials and special fields, can solve the problems of complex molding process, poor toughness, poor thermal shock resistance, etc., and achieve excellent dielectric properties, increased strength, and good mechanics Effect

Inactive Publication Date: 2012-04-25
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] But so far, there is no material that fully possesses all the above-mentioned excellent properties.
Inorganic ceramic materials can withstand high temperature, good dielectric properties and high strength, but they are brittle, poor in toughness, poor in thermal shock resistance and complex in molding process

Method used

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  • Magnesium silicate ceramic wave-transparent material and preparation method thereof

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Effect test

Embodiment 1

[0028] The preparation method of magnesium silicate ceramic material of the present invention is as follows:

[0029] Weigh 100g of high-purity MgO powder with a particle size of 0.5-10μm, and first place it in a muffle furnace for calcination at 700°C for 2 hours to remove CO 2 and moisture; then 100g of analytically pure SiO with a particle size of less than 1 μm 2 Dry in a drying oven at 100°C for 24 hours to avoid the stoichiometric ratio shift due to moisture absorption. Use a precision electronic balance to measure the processed raw materials by MgO / SiO 2 Proportion R = 2. Accurately weigh the ingredients. The prepared powder, ZrO 2 Put the balls and deionized water into a well-sealed agate jar at a ratio of 1:1:2, put them into a planetary ball mill, and dry them after ball milling. Then the dried Mg 2 SiO 4 Put the ceramic powder into an alumina crucible and place it in a muffle furnace at 1000°C in an air atmosphere for 4 hours to pre-fire to make the raw materia...

Embodiment 2

[0034] The preparation method of magnesium silicate ceramic material of the present invention is as follows:

[0035] Weigh 100g of high-purity MgO powder with a particle size of 0.5-10μm, and first place it in a muffle furnace for calcination at 500°C for 3 hours to remove CO 2 and moisture; then 100g of analytically pure SiO with a particle size of less than 1 μm 2 Dry in a drying oven at 120°C for 18 hours to avoid the shift of stoichiometric ratio due to moisture absorption. Use a precision electronic balance to measure the processed raw materials by MgO / SiO 2 Proportion R = 2.05 after accurate weighing of ingredients. The prepared powder, ZrO 2 Put the balls and deionized water into a well-sealed agate jar at a ratio of 1:1:2, put them into a planetary ball mill, and dry them after ball milling. Then the dried Mg 2 SiO 4 The ceramic powder is placed in an alumina crucible and placed in a muffle furnace at 1100°C in an air atmosphere for 3 hours to pre-fire to fully r...

Embodiment 3

[0040] The preparation method of magnesium silicate ceramic material of the present invention is as follows:

[0041] Weigh 100g of high-purity MgO powder with a particle size of 0.5-10μm, and first place it in a muffle furnace for calcination at 900°C for 1 hour to remove CO 2 and moisture; then 100g of analytically pure SiO with a particle size of less than 1 μm 2 Dry in a drying oven at 150°C for 12 hours to avoid the shift of stoichiometric ratio due to moisture absorption. Use a precision electronic balance to measure the processed raw materials by MgO / SiO 2 Proportion R = 2.1 Accurately weigh the ingredients. The prepared powder, ZrO 2 Put the balls and deionized water into a well-sealed agate jar at a ratio of 1:1:2, put them into a planetary ball mill, and dry them after ball milling. Then the dried Mg 2 SiO 4 The ceramic powder is placed in an alumina crucible and pre-fired in an air atmosphere at 1150°C for 3 hours in a muffle furnace to fully react the raw mate...

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Abstract

The invention discloses magnesium silicate ceramic wave-transparent materials and a preparation method thereof, relates to a special functional ceramic material, and provides a magnesium silicate ceramic wave-transparent material with low density, high strength, low thermal conductivity, small thermal expansion and good dielectric properties and a preparation method thereof. The raw materials are magnesium oxide, silicon dioxide and pore-forming materials. According to mass percentage, the content of the pore-forming materials is 5% to 30% of the total mass of the magnesium oxide and the silicon dioxide, the content of the magnesium oxide is 65 % to 75%, and the content of the silicon dioxide is 35% to 25%. The magnesium oxide is calcined to eliminate CO2 and water. The silicon dioxide is dried. The calcined magnesium oxide and the dried silicon dioxide are mixed for pre-burning. The mixture of the pre-burned magnesia and silicon dioxide is treated with ball milling and drying. The mixture of the magnesium oxide and the silicon dioxide after the ball milling and drying is evenly mixed with the pore-forming materials, and then a binder is added. Granulation is conducted. The powder after granulation is pressed to form tablets after the granulation and then is sintered, thus obtaining the magnesium silicate ceramic wave-transparent materials.

Description

technical field [0001] The invention relates to a special and functional ceramic material, in particular to a magnesium silicate ceramic wave-transmitting material and a preparation method thereof. Background technique [0002] The development of aerospace technology and military science and technology puts forward high requirements on the performance of wave-transparent materials. In order to efficiently and reliably play the role of wave transmission, wave-transparent materials are generally required to have excellent dielectric properties, good heat resistance, environmental resistance, high mechanical strength, and productivity and economy. [0003] However, as far as the wave-transparent material system is concerned, both ceramic composite materials and fiber-reinforced ceramic matrix composite materials have been studied at home and abroad. Korean scientists (Lee Sangjin, Kriven W M.Fabrication of low thermal expansion and lowdielectric ceramic substrates by control o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/20C04B35/622
Inventor 熊兆贤周明勇郑建森薛昊
Owner XIAMEN UNIV