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Low temperature sintered alumina black ceramic, and preparation method thereof

A black ceramic, low-temperature sintering technology, applied in the field of ceramics, can solve the problems of high cost, high sintering porosity, low light transmittance, etc., and achieve excellent thermal shock resistance, simple firing process, and good dielectric properties.

Active Publication Date: 2019-10-15
新化县顺达电子陶瓷有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Black ceramics are characterized by low light transmittance, and the appearance is not easy to be polluted. It is suitable for multi-layer sintered ceramic substrates and ceramic shells for optoelectronics, digital integrated circuits, and microwave circuit devices. However, black ceramics are sintered at high temperatures due to the addition of inorganic colorants. The lower coloring elements will volatilize. Compared with low-temperature sintered ceramics, the cost process is more difficult and the cost is higher; and because a large amount of glass components are usually added to low-temperature sintered ceramic materials, the sintered porosity is high and the mechanical strength is relatively low.

Method used

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preparation example Construction

[0023] The invention provides a method for preparing low-temperature sintered alumina black ceramics, the preparation method comprising the following steps:

[0024] 1) Weighing: Weigh α-Al by a certain number of parts by mass 2 o 3 , talc, clay, SiO 2 , composite modifiers and colorants;

[0025] 2) Ball milling: adding the raw materials weighed in step 1) into a ball mill for mixing and ball milling to obtain a premix;

[0026] 3) granulation: the premix obtained in step 2) is mixed with the PVA binder solution, and granulated to obtain black ceramic particles;

[0027] 4) Compression molding: placing the black ceramic particles obtained in step 3) in a mold for compression molding to obtain a black ceramic green body;

[0028] 5) Low-temperature sintering: the black ceramic green body in step 4) is placed in a low-temperature sintering furnace, and sintered by gradually raising the temperature at a low temperature for a long time to form a low-temperature sintered black...

Embodiment 1

[0040] This embodiment provides a method for preparing low-temperature sintered alumina black ceramics, the preparation method comprising the following steps:

[0041] 1) Weighing: Weigh raw materials according to the following mass fraction: α-Al 2 o 3 98% of the total mass, MgO and TiO 2 Accounting for 0.5% of the total mass, clay, talc and silicon dioxide account for 6% of the total mass, cobalt oxide accounts for 0.05% of the total mass, of which α-Al 2 o 3 The purity is 95%, after weighing the α-Al 2 o 3 Carry out high-temperature calcination treatment, the temperature of high-temperature calcination is 1300°C, and the calcination time is 5h;

[0042] 2) Ball milling: Add the raw materials weighed in step 1) into a ball mill for mixing ball milling. The ball milling medium is absolute ethanol, and zirconia balls are selected. The ball milling speed is 500r / min, and the ball milling time is 5h, until the premixed material has a particle size 1um;

[0043] 3) Granula...

Embodiment 2

[0047] This embodiment provides a method for preparing low-temperature sintered alumina black ceramics, the preparation method comprising the following steps:

[0048] 1) Weighing: Weigh raw materials according to the following mass fraction: α-Al 2 o 3 90% of the total mass, MgO and TiO 2 2% of the total mass, clay, talc and silicon dioxide account for 3% of the total mass, cobalt oxide accounts for 1.5% of the total mass, of which α-Al 2 o 3 The purity is 99.9%, after weighing the α-Al 2 o 3 Carry out high-temperature calcination treatment, the temperature of high-temperature calcination is 1500°C, and the calcination time is 2h;

[0049] 2) Ball milling: Add the raw materials weighed in step 1) into a ball mill for mixing and ball milling. The ball milling medium is absolute ethanol, and zirconia balls are selected. The ball milling speed is 150r / min, and the ball milling time is 12h, until the particle size of the premix is 0.01um;

[0050] 3) Granulation: the premi...

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Abstract

The invention provides a low temperature sintered alumina black ceramic, and a preparation method thereof. The preparation method comprises following steps: weighing, wherein by a certain mass ratio,alpha-Al2O3, powdered steatile, clay, SiO2, a composite modifying agent, and a colouring agent are weighed; ball milling, wherein the weighed raw materials are introduced into a ball milling machine for material mixing ball milling so as to obtain a premix; granulation, wherein the premix is mixed with a PVA binding agent solution for granulation so as to obtain black ceramic particles; pressing moulding, wherein the black ceramic particles are introduced into a mould for pressing moulding so as to obtain a black ceramic blank; and low temperature sintering, wherein the ceramic blank is introduced into a low temperature sintering furnace for low temperature long time graduate heating sintering so as to obtain low temperature sintered black ceramic. The alumina black ceramic prepared through low temperature sintering is simple in sintering technology, compact in ceramic body, high in mechanical strength, and excellent in dielectric properties and thermal shock resistance.

Description

technical field [0001] The invention relates to the field of ceramics, in particular to a low-temperature sintered alumina black ceramic and a preparation method thereof. Background technique [0002] Alumina ceramics are divided into two types: high-purity type and ordinary type. The ordinary type of alumina ceramics is based on Al 2 o 3 Different content is divided into 99 porcelain, 95 porcelain, 90 porcelain, 85 porcelain and other varieties, sometimes Al 2 o 3 Those with a content of 80% or 75% are also classified as ordinary alumina ceramic series, of which 99% alumina ceramic materials are used to make high-temperature crucibles, refractory furnace tubes and special wear-resistant materials, such as ceramic bearings, ceramic seals and water valves, etc. ; 95 alumina porcelain is mainly used as corrosion-resistant, wear-resistant parts, electronic packaging materials. [0003] Black ceramics are characterized by low light transmittance, and the appearance is not ea...

Claims

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Application Information

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IPC IPC(8): C04B35/10C04B35/622
CPCC04B35/10C04B35/622C04B2235/3206C04B2235/3232C04B2235/3241C04B2235/3265C04B2235/3272C04B2235/3418C04B2235/349C04B2235/6567C04B2235/9661
Inventor 李国文
Owner 新化县顺达电子陶瓷有限公司
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