CN107793138B - Alumina ceramic - Google Patents

Alumina ceramic Download PDF

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CN107793138B
CN107793138B CN201711410790.0A CN201711410790A CN107793138B CN 107793138 B CN107793138 B CN 107793138B CN 201711410790 A CN201711410790 A CN 201711410790A CN 107793138 B CN107793138 B CN 107793138B
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CN107793138A (en
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刘彪
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Ningbo Runda Ceramic Technology Co., Ltd
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    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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    • C04B35/628—Coating the powders or the macroscopic reinforcing agents
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    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
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    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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    • C04B2235/3427—Silicates other than clay, e.g. water glass
    • C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
    • C04B2235/3472—Alkali metal alumino-silicates other than clay, e.g. spodumene, alkali feldspars such as albite or orthoclase, micas such as muscovite, zeolites such as natrolite
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Abstract

The invention discloses an alumina ceramic, which relates to the technical field of ceramics and is prepared from the following components: silanized alumina, bismuth oxide, titanium dioxide, modified nano-silica, magnesium carbonate, yttrium oxide and sericite powder; the shrinkage rate of the prepared alumina ceramic is lower than 1%, the loss on ignition caused by impurities in raw materials can be effectively removed after sintering and forming, the shrinkage rate of a finished product is low, the consistency is good, the density is high, and the wear resistance and the toughness are obviously improved.

Description

Alumina ceramic
Technical Field
The invention belongs to the technical field of ceramics, and particularly relates to an alumina ceramic.
Background
Alumina exists widely in nature and is one of the most practically used oxide materials. The alumina-based ceramic material has the excellent performances of high strength, high hardness, wear resistance, high temperature resistance, corrosion resistance, high electrical insulation performance, low dielectric loss and the like, so the alumina-based ceramic material has important application value in the aspects of structural ceramics, electronic ceramics and biological ceramics. The raw materials are wide in source and low in price, and are incomparable with other high-performance ceramic materials (silicon carbide and silicon nitride). The chemical bond of the alumina ceramic is an ionic bond, has high binding energy and strong directionality, and causes the fatal defects of large brittleness, difficult plastic deformation, poor uniformity and the like, and the toughness of the material is very low and is usually only 3MPa1/2And because the thermal expansion coefficient is large, the thermal shock resistance of the material is very poor, and researches show that the thermal stress in the material caused by the anisotropic expansion coefficient of the alumina ceramic material can reach 80-100 MPa under thermal shock, and the alumina ceramic material can crack automatically frequently.
Disclosure of Invention
The invention aims to solve the existing problems and provides an alumina ceramic.
The invention is realized by the following technical scheme:
the alumina ceramic is prepared from the following components in parts by weight: 80-95 parts of silanized alumina, 3-5 parts of bismuth oxide, 5-8 parts of titanium dioxide, 25-30 parts of modified nano-silica, 6-10 parts of magnesium carbonate, 0.02-0.05 part of yttrium oxide and 8-12 parts of sericite powder.
Further, the particle size of the sericite powder is 300 meshes.
Further, the preparation method of the silanized alumina comprises the following steps: heating aluminum oxide in an inert gas atmosphere by using dimethyl vinyl silanol and sodium alginate as surface treating agents, grinding, filtering and cleaning the surface to obtain the aluminum oxide.
Further, the preparation method of the silanized alumina comprises the following steps: uniformly mixing dimethyl vinyl silanol and sodium alginate according to a mass ratio of 5:1 to prepare a surface treating agent, uniformly mixing the surface treating agent and aluminum oxide according to a mass ratio of 10:3, adding the mixture into a reaction kettle, removing air in the reaction kettle by adopting nitrogen, heating to 150 ℃, preserving heat for 2 hours, taking out, grinding, and sieving by using a 300-mesh sieve to obtain the nano-silver-based nano-silver surface treating agent.
Further, the preparation method of the modified nano silicon dioxide comprises the following steps: weighing 30 parts of nano silicon dioxide, 0.3 part of organosilane coupling agent, 3.5 parts of stearic acid and 80 parts of absolute ethyl alcohol according to parts by weight; mixing nano silicon dioxide and an organic silane coupling agent, adding the mixture into a high-speed mixer, mixing for 30min at the mixing speed of 3500r/min, adding stearic acid, continuously mixing for 40min, taking out to obtain a mixture, adding the mixture into absolute ethyl alcohol, grinding for 2 hours, and performing rotary evaporation drying to obtain the nano silicon dioxide/organic silane coupling agent.
The alumina ceramic of the invention is sintered and formed at a low temperature of 1220 ℃, and the volume density can reach 3.92g cm-3The dielectric constant is 9.92, and the Q × f value can reach 34000 GHz.
Compared with the prior art, the invention has the following advantages: the shrinkage rate of the prepared alumina ceramic is lower than 1%, the loss on ignition caused by impurities in raw materials can be effectively removed after sintering and forming, the shrinkage rate of a finished product is low, the consistency is good, the density is high, and the wear resistance and the toughness are obviously improved.
Detailed Description
Example 1
The alumina ceramic is prepared from the following components in parts by weight: 80 parts of silanized alumina, 3 parts of bismuth oxide, 5 parts of titanium dioxide, 25 parts of modified nano-silica, 6 parts of magnesium carbonate, 0.02 part of yttrium oxide and 8 parts of sericite powder.
Further, the particle size of the sericite powder is 300 meshes.
Further, the preparation method of the silanized alumina comprises the following steps: heating aluminum oxide in an inert gas atmosphere by using dimethyl vinyl silanol and sodium alginate as surface treating agents, grinding, filtering and cleaning the surface to obtain the aluminum oxide.
Further, the preparation method of the silanized alumina comprises the following steps: uniformly mixing dimethyl vinyl silanol and sodium alginate according to a mass ratio of 5:1 to prepare a surface treating agent, uniformly mixing the surface treating agent and aluminum oxide according to a mass ratio of 10:3, adding the mixture into a reaction kettle, removing air in the reaction kettle by adopting nitrogen, heating to 150 ℃, preserving heat for 2 hours, taking out, grinding, and sieving by using a 300-mesh sieve to obtain the nano-silver-based nano-silver surface treating agent.
Further, the preparation method of the modified nano silicon dioxide comprises the following steps: weighing 30 parts of nano silicon dioxide, 0.3 part of organosilane coupling agent, 3.5 parts of stearic acid and 80 parts of absolute ethyl alcohol according to parts by weight; mixing nano silicon dioxide and an organic silane coupling agent, adding the mixture into a high-speed mixer, mixing for 30min at the mixing speed of 3500r/min, adding stearic acid, continuously mixing for 40min, taking out to obtain a mixture, adding the mixture into absolute ethyl alcohol, grinding for 2 hours, and performing rotary evaporation drying to obtain the nano silicon dioxide/organic silane coupling agent.
Example 2
The alumina ceramic is prepared from the following components in parts by weight: 95 parts of silanized alumina, 5 parts of bismuth oxide, 8 parts of titanium dioxide, 30 parts of modified nano-silica, 10 parts of magnesium carbonate, 0.05 part of yttrium oxide and 12 parts of sericite powder.
Further, the particle size of the sericite powder is 300 meshes.
Further, the preparation method of the silanized alumina comprises the following steps: heating aluminum oxide in an inert gas atmosphere by using dimethyl vinyl silanol and sodium alginate as surface treating agents, grinding, filtering and cleaning the surface to obtain the aluminum oxide.
Further, the preparation method of the silanized alumina comprises the following steps: uniformly mixing dimethyl vinyl silanol and sodium alginate according to a mass ratio of 5:1 to prepare a surface treating agent, uniformly mixing the surface treating agent and aluminum oxide according to a mass ratio of 10:3, adding the mixture into a reaction kettle, removing air in the reaction kettle by adopting nitrogen, heating to 150 ℃, preserving heat for 2 hours, taking out, grinding, and sieving by using a 300-mesh sieve to obtain the nano-silver-based nano-silver surface treating agent.
Further, the preparation method of the modified nano silicon dioxide comprises the following steps: weighing 30 parts of nano silicon dioxide, 0.3 part of organosilane coupling agent, 3.5 parts of stearic acid and 80 parts of absolute ethyl alcohol according to parts by weight; mixing nano silicon dioxide and an organic silane coupling agent, adding the mixture into a high-speed mixer, mixing for 30min at the mixing speed of 3500r/min, adding stearic acid, continuously mixing for 40min, taking out to obtain a mixture, adding the mixture into absolute ethyl alcohol, grinding for 2 hours, and performing rotary evaporation drying to obtain the nano silicon dioxide/organic silane coupling agent.
Example 3
The alumina ceramic is prepared from the following components in parts by weight: silanized alumina 88, bismuth oxide 4, titanium dioxide 6, modified nano-silica 28, magnesium carbonate 8, yttrium oxide 0.03 and sericite powder 10.
Further, the particle size of the sericite powder is 300 meshes.
Further, the preparation method of the silanized alumina comprises the following steps: heating aluminum oxide in an inert gas atmosphere by using dimethyl vinyl silanol and sodium alginate as surface treating agents, grinding, filtering and cleaning the surface to obtain the aluminum oxide.
Further, the preparation method of the silanized alumina comprises the following steps: uniformly mixing dimethyl vinyl silanol and sodium alginate according to a mass ratio of 5:1 to prepare a surface treating agent, uniformly mixing the surface treating agent and aluminum oxide according to a mass ratio of 10:3, adding the mixture into a reaction kettle, removing air in the reaction kettle by adopting nitrogen, heating to 150 ℃, preserving heat for 2 hours, taking out, grinding, and sieving by using a 300-mesh sieve to obtain the nano-silver-based nano-silver surface treating agent.
Further, the preparation method of the modified nano silicon dioxide comprises the following steps: weighing 30 parts of nano silicon dioxide, 0.3 part of organosilane coupling agent, 3.5 parts of stearic acid and 80 parts of absolute ethyl alcohol according to parts by weight; mixing nano silicon dioxide and an organic silane coupling agent, adding the mixture into a high-speed mixer, mixing for 30min at the mixing speed of 3500r/min, adding stearic acid, continuously mixing for 40min, taking out to obtain a mixture, adding the mixture into absolute ethyl alcohol, grinding for 2 hours, and performing rotary evaporation drying to obtain the nano silicon dioxide/organic silane coupling agent.
Comparative example 1: the only difference from example 1 is that the silanized alumina was replaced with ordinary alumina.
Comparative example 2: the only difference from example 1 is that the modified silica was replaced with ordinary silica.
Comparative example 3: only different from example 1 in that sericite powder was not added.
And (3) testing:
the bending strength and the fracture toughness of the alumina ceramics prepared in the examples and the comparative examples are respectively detected;
TABLE 1
Bending strength MPa Fracture toughness MPa.m1/2
Example 1 362.51 5.68
Example 2 360.73 5.63
Example 3 361.82 5.65
Comparative example 1 350.71 5.01
Comparative example 2 336.78 5.27
Comparative example 3 355.63 5.32
As can be seen from Table 1, the alumina ceramic material prepared by the invention not only has good bending strength, but also has good fracture toughness.

Claims (1)

1. The alumina ceramic is characterized by being prepared from the following components in parts by weight: 80-95 parts of silanized alumina, 3-5 parts of bismuth oxide, 5-8 parts of titanium dioxide, 25-30 parts of modified nano-silica, 6-10 parts of magnesium carbonate, 0.02-0.05 part of yttrium oxide and 8-12 parts of sericite powder; the particle size of the sericite powder is 300 meshes; the preparation method of the silanized alumina comprises the following steps: heating aluminum oxide in an inert gas atmosphere by using dimethyl vinyl silanol and sodium alginate as surface treating agents, grinding, filtering and cleaning the surface to obtain the aluminum oxide nano-particles; the preparation method of the silanized alumina comprises the following steps: uniformly mixing dimethyl vinyl silanol and sodium alginate according to a mass ratio of 5:1 to prepare a surface treating agent, uniformly mixing the surface treating agent and aluminum oxide according to a mass ratio of 10:3, adding the mixture into a reaction kettle, removing air in the reaction kettle by adopting nitrogen, heating to 150 ℃, preserving heat for 2 hours, taking out, grinding, and sieving by using a 300-mesh sieve to obtain the nano-silver-based nano-silver-containing material; the preparation method of the modified nano silicon dioxide comprises the following steps: weighing 30 parts of nano silicon dioxide, 0.3 part of organosilane coupling agent, 3.5 parts of stearic acid and 80 parts of absolute ethyl alcohol according to parts by weight; mixing nano silicon dioxide and an organic silane coupling agent, adding the mixture into a high-speed mixer, mixing for 30min at the mixing speed of 3500r/min, adding stearic acid, continuously mixing for 40min, taking out to obtain a mixture, adding the mixture into absolute ethyl alcohol, grinding for 2 hours, and performing rotary evaporation drying to obtain the nano silicon dioxide/organic silane coupling agent.
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CN116751035A (en) * 2023-05-31 2023-09-15 新化县新天地精细陶瓷有限公司 Alumina ceramic material for thermal quantity sensor
CN117164371B (en) * 2023-08-25 2024-03-26 苏州晶瓷超硬材料有限公司 High-strength high-temperature-resistant ceramic material and preparation method thereof

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CN102219482A (en) * 2011-04-26 2011-10-19 中广核工程有限公司 Ceramic material and preparation method thereof
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