CN107793138A - A kind of aluminium oxide ceramics - Google Patents

A kind of aluminium oxide ceramics Download PDF

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CN107793138A
CN107793138A CN201711410790.0A CN201711410790A CN107793138A CN 107793138 A CN107793138 A CN 107793138A CN 201711410790 A CN201711410790 A CN 201711410790A CN 107793138 A CN107793138 A CN 107793138A
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aluminium oxide
oxide ceramics
silicon dioxide
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modified manometer
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CN107793138B (en
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刘彪
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Ningbo Runda Ceramic Technology Co., Ltd
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刘彪
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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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    • 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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Abstract

The invention discloses a kind of aluminium oxide ceramics, is related to ceramic technology field, is made up of following component：Silanized alumina, bismuth oxide, titanium dioxide, modified manometer silicon dioxide, magnesium carbonate, yttria, sericite in powder；Aluminium oxide ceramics shrinkage factor prepared by the present invention is less than 1%, after sinter molding, loss on ignition caused by the impurity in raw material can effectively be removed, finished product shrinkage factor is low, uniformity is good, consistency is high, wearability and toughness tool are significantly improved, the present invention uses the synergy of silanized alumina and modified manometer silicon dioxide, especially add modified manometer silicon dioxide, the effect of acceleration of sintering had both been served in the feed, strengthen its toughness again simultaneously, reduce thermal coefficient of expansion, so that the bending strength of alumina ceramic material, fracture toughness, thermal shock resistance all significantly improves, so as to greatly improve the combination property of ceramic material.

Description

A kind of aluminium oxide ceramics
Technical field
The invention belongs to ceramic technology field, and in particular to a kind of aluminium oxide ceramics.
Background technology
Aluminum oxide exists quite varied in nature, is one of most oxide material of practical application.Alumina base is made pottery Ceramic material has that intensity is high, hardness is big, the high Optimality such as low with dielectric loss of wear-resisting, high temperature resistant, anticorrosive, electrical insulation capability Can, so having important application value in terms of structural ceramics, electronic ceramics and bioceramic.Its raw material sources is extensive, valency Lattice are cheap and other high performance ceramic materials (carborundum, silicon nitride) are incomparable.The chemical bond of aluminium oxide ceramics is Ionic bond, there is very high combination with very strong directionality fragility can be caused big, plastic deformation hardly possible and lack of homogeneity etc. are fatal weak Point, the toughness of this material is very low, generally only 3MPa.m1/2, and because thermal coefficient of expansion is larger, its heat shock resistance Performance is very poor, and research shows alumina ceramic material under thermal shock, due to caused by anisotropic expansion coefficient in material Portion's thermal stress can reach 80 ~ 100MPa, often voluntarily ftracture.
The content of the invention
The purpose of the present invention is to be directed to the problem of existing, there is provided a kind of aluminium oxide ceramics.
The present invention is achieved by the following technical solutions：
A kind of aluminium oxide ceramics, is made up of following component by weight：Silanized alumina 80-95, bismuth oxide 3-5, dioxy Change titanium 5-8, modified manometer silicon dioxide 25-30, magnesium carbonate 6-10, yttria 0.02-0.05, sericite in powder 8-12.
Further, the sericite in powder granularity is 300 mesh.
Further, the silanized alumina preparation method includes：With dimethyl ethenyl silanol and alginic acid Sodium is that surface conditioning agent heats under inert gas atmosphere to aluminum oxide, is then ground, filters, surface is clear Wash, produce.
Further, the silanized alumina preparation method is：By dimethyl ethenyl silanol and sodium alginate By 5:Surface conditioning agent is made after uniformly mixing in 1 mass ratio, and surface conditioning agent and aluminum oxide are pressed into 10:3 mass ratioes uniformly mix After conjunction, it is added in reactor, the air in reactor is excluded using nitrogen, is heated to 150 DEG C, is incubated 2 hours, Ran Houqu Go out, be ground, cross 300 mesh sieves, produce.
Further, the modified manometer silicon dioxide preparation method is：Weigh by weight 30 parts of nano silicon, 0.3 part of organo silane coupling agent, 3.5 parts of stearic acid, 80 parts of absolute ethyl alcohol；Nano silicon and organo silane coupling agent are mixed After conjunction, it is added in high-speed mixer and carries out mixing 30min, mixing velocity 3500r/min, then adds stearic acid again, after Continuous mixing 40min, takes out, obtains compound, compound is added in absolute ethyl alcohol, be ground 2 hours, then revolved Turn evaporation drying, produce.
Aluminium oxide ceramics of the present invention sinter molding in a low temperature of 1220 DEG C, its bulk density is up to 3.92gcm-3, it is situated between Electric constant is that 9.92, Q × f values can reach 34000GHz.
The present invention has advantages below compared with prior art：Aluminium oxide ceramics shrinkage factor prepared by the present invention is less than 1%, warp After oversintering shaping, loss on ignition caused by the impurity in raw material can be effectively removed, finished product shrinkage factor is low, and uniformity is good, Consistency is high, and wearability and toughness tool are significantly improved, and the present invention uses silanized alumina and modified manometer silicon dioxide Synergy, especially add modified manometer silicon dioxide, both served the effect of acceleration of sintering in the feed, while increase again Its strong toughness, reduces thermal coefficient of expansion so that the bending strength of alumina ceramic material, fracture toughness, thermal shock resistance are all aobvious Write and improve, so as to greatly improve the combination property of ceramic material.
Embodiment
Embodiment 1
A kind of aluminium oxide ceramics, is made up of following component by weight：Silanized alumina 80, bismuth oxide 3, titanium dioxide 5, Modified manometer silicon dioxide 25, magnesium carbonate 6, yttria 0.02, sericite in powder 8.
Further, the sericite in powder granularity is 300 mesh.
Further, the silanized alumina preparation method includes：With dimethyl ethenyl silanol and alginic acid Sodium is that surface conditioning agent heats under inert gas atmosphere to aluminum oxide, is then ground, filters, surface is clear Wash, produce.
Further, the silanized alumina preparation method is：By dimethyl ethenyl silanol and sodium alginate By 5:Surface conditioning agent is made after uniformly mixing in 1 mass ratio, and surface conditioning agent and aluminum oxide are pressed into 10:3 mass ratioes uniformly mix After conjunction, it is added in reactor, the air in reactor is excluded using nitrogen, is heated to 150 DEG C, is incubated 2 hours, Ran Houqu Go out, be ground, cross 300 mesh sieves, produce.
Further, the modified manometer silicon dioxide preparation method is：Weigh by weight 30 parts of nano silicon, 0.3 part of organo silane coupling agent, 3.5 parts of stearic acid, 80 parts of absolute ethyl alcohol；Nano silicon and organo silane coupling agent are mixed After conjunction, it is added in high-speed mixer and carries out mixing 30min, mixing velocity 3500r/min, then adds stearic acid again, after Continuous mixing 40min, takes out, obtains compound, compound is added in absolute ethyl alcohol, be ground 2 hours, then revolved Turn evaporation drying, produce.
Embodiment 2
A kind of aluminium oxide ceramics, is made up of following component by weight：Silanized alumina 95, bismuth oxide 5, titanium dioxide 8, Modified manometer silicon dioxide 30, magnesium carbonate 10, yttria 0.05, sericite in powder 12.
Further, the sericite in powder granularity is 300 mesh.
Further, the silanized alumina preparation method includes：With dimethyl ethenyl silanol and alginic acid Sodium is that surface conditioning agent heats under inert gas atmosphere to aluminum oxide, is then ground, filters, surface is clear Wash, produce.
Further, the silanized alumina preparation method is：By dimethyl ethenyl silanol and sodium alginate By 5:Surface conditioning agent is made after uniformly mixing in 1 mass ratio, and surface conditioning agent and aluminum oxide are pressed into 10:3 mass ratioes uniformly mix After conjunction, it is added in reactor, the air in reactor is excluded using nitrogen, is heated to 150 DEG C, is incubated 2 hours, Ran Houqu Go out, be ground, cross 300 mesh sieves, produce.
Further, the modified manometer silicon dioxide preparation method is：Weigh by weight 30 parts of nano silicon, 0.3 part of organo silane coupling agent, 3.5 parts of stearic acid, 80 parts of absolute ethyl alcohol；Nano silicon and organo silane coupling agent are mixed After conjunction, it is added in high-speed mixer and carries out mixing 30min, mixing velocity 3500r/min, then adds stearic acid again, after Continuous mixing 40min, takes out, obtains compound, compound is added in absolute ethyl alcohol, be ground 2 hours, then revolved Turn evaporation drying, produce.
Embodiment 3
A kind of aluminium oxide ceramics, is made up of following component by weight：Silanized alumina 88, bismuth oxide 4, titanium dioxide 6, Modified manometer silicon dioxide 28, magnesium carbonate 8, yttria 0.03, sericite in powder 10.
Further, the sericite in powder granularity is 300 mesh.
Further, the silanized alumina preparation method includes：With dimethyl ethenyl silanol and alginic acid Sodium is that surface conditioning agent heats under inert gas atmosphere to aluminum oxide, is then ground, filters, surface is clear Wash, produce.
Further, the silanized alumina preparation method is：By dimethyl ethenyl silanol and sodium alginate By 5:Surface conditioning agent is made after uniformly mixing in 1 mass ratio, and surface conditioning agent and aluminum oxide are pressed into 10:3 mass ratioes uniformly mix After conjunction, it is added in reactor, the air in reactor is excluded using nitrogen, is heated to 150 DEG C, is incubated 2 hours, Ran Houqu Go out, be ground, cross 300 mesh sieves, produce.
Further, the modified manometer silicon dioxide preparation method is：Weigh by weight 30 parts of nano silicon, 0.3 part of organo silane coupling agent, 3.5 parts of stearic acid, 80 parts of absolute ethyl alcohol；Nano silicon and organo silane coupling agent are mixed After conjunction, it is added in high-speed mixer and carries out mixing 30min, mixing velocity 3500r/min, then adds stearic acid again, after Continuous mixing 40min, takes out, obtains compound, compound is added in absolute ethyl alcohol, be ground 2 hours, then revolved Turn evaporation drying, produce.
Comparative example 1：Differed only in embodiment 1 and silanized alumina is being replaced with into common aluminum oxide.
Comparative example 2：Differed only in embodiment 1 and improved silica is replaced with into general silica.
Comparative example 3：Differed only in embodiment 1 and do not add sericite in powder.
Experiment：
The aluminium oxide ceramics prepared respectively to embodiment and comparative example carries out bending strength and fracture toughness detects；
Table 1
Bending strength MPa Fracture toughness MPa.m1/2
Embodiment 1 362.51 5.68
Embodiment 2 360.73 5.63
Embodiment 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 that prepared by the present invention not only has good bending strength, while also has Good fracture toughness.

Claims (5)

1. a kind of aluminium oxide ceramics, it is characterised in that be made up by weight of following component：Silanized alumina 80-95, oxygen Change bismuth 3-5, titanium dioxide 5-8, modified manometer silicon dioxide 25-30, magnesium carbonate 6-10, yttria 0.02-0.05, thin,tough silk cloud Female powder 8-12.
2. a kind of aluminium oxide ceramics as claimed in claim 1, it is characterised in that the sericite in powder granularity is 300 mesh.
A kind of 3. aluminium oxide ceramics as claimed in claim 1, it is characterised in that the silanized alumina preparation method bag Include：Aluminum oxide is added under inert gas atmosphere as surface conditioning agent using dimethyl ethenyl silanol and sodium alginate Heat treatment, is then ground, and filters, surface clean, produces.
4. a kind of aluminium oxide ceramics as claimed in claim 3, it is characterised in that the silanized alumina preparation method is： Dimethyl ethenyl silanol and sodium alginate are pressed 5:Surface conditioning agent is made after uniformly mixing in 1 mass ratio, by surface Inorganic agent presses 10 with aluminum oxide:3 mass ratioes uniformly after mixing, are added in reactor, and the sky in reactor is excluded using nitrogen Gas, 150 DEG C are heated to, are incubated 2 hours, then take out, be ground, crossed 300 mesh sieves, produce.
A kind of 5. aluminium oxide ceramics as claimed in claim 1, it is characterised in that the modified manometer silicon dioxide preparation method For：30 parts of nano silicon, 0.3 part of organo silane coupling agent, 3.5 parts of stearic acid, 80 parts of absolute ethyl alcohol are weighed by weight； After nano silicon is mixed with organo silane coupling agent, it is added in high-speed mixer and carries out mixing 30min, mixing velocity For 3500r/min, stearic acid is then added again, is continued to mix 40min, is taken out, obtain compound, compound is added to anhydrous In ethanol, it is ground 2 hours, then carries out rotary evaporation drying, produce.
CN201711410790.0A 2017-12-23 2017-12-23 Alumina ceramic Active CN107793138B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN117164371A (en) * 2023-08-25 2023-12-05 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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Cited By (3)

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Publication number Priority date Publication date Assignee Title
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
CN117164371A (en) * 2023-08-25 2023-12-05 苏州晶瓷超硬材料有限公司 High-strength high-temperature-resistant ceramic material and preparation method thereof
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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