CN111302768A - Novel porous oxide ceramic and preparation method thereof - Google Patents
Novel porous oxide ceramic and preparation method thereof Download PDFInfo
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- CN111302768A CN111302768A CN202010214471.8A CN202010214471A CN111302768A CN 111302768 A CN111302768 A CN 111302768A CN 202010214471 A CN202010214471 A CN 202010214471A CN 111302768 A CN111302768 A CN 111302768A
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- 229910052574 oxide ceramic Inorganic materials 0.000 title claims abstract description 52
- 239000011224 oxide ceramic Substances 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title abstract description 19
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 48
- 229910002076 stabilized zirconia Inorganic materials 0.000 claims abstract description 46
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 45
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 45
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 45
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 45
- 229910000480 nickel oxide Inorganic materials 0.000 claims abstract description 44
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims abstract description 44
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229920002125 Sokalan® Polymers 0.000 claims abstract description 33
- 238000000498 ball milling Methods 0.000 claims abstract description 27
- 229910052727 yttrium Inorganic materials 0.000 claims abstract description 21
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 18
- 239000002270 dispersing agent Substances 0.000 claims abstract description 17
- 238000005469 granulation Methods 0.000 claims abstract description 17
- 230000003179 granulation Effects 0.000 claims abstract description 17
- 239000004014 plasticizer Substances 0.000 claims abstract description 17
- 239000011812 mixed powder Substances 0.000 claims abstract description 15
- 239000002002 slurry Substances 0.000 claims abstract description 12
- 239000011230 binding agent Substances 0.000 claims abstract description 11
- 238000005245 sintering Methods 0.000 claims abstract description 10
- 238000009694 cold isostatic pressing Methods 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 9
- 239000004584 polyacrylic acid Substances 0.000 claims abstract description 9
- 239000002245 particle Substances 0.000 claims description 36
- 239000011148 porous material Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 239000008213 purified water Substances 0.000 claims description 8
- 239000002904 solvent Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 claims 1
- 239000000919 ceramic Substances 0.000 abstract description 18
- 230000003197 catalytic effect Effects 0.000 abstract description 12
- 229910010293 ceramic material Inorganic materials 0.000 abstract description 9
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 12
- 239000007789 gas Substances 0.000 description 12
- 239000007788 liquid Substances 0.000 description 12
- 239000000843 powder Substances 0.000 description 12
- 239000000428 dust Substances 0.000 description 9
- 239000003054 catalyst Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 7
- 238000005054 agglomeration Methods 0.000 description 6
- 230000002776 aggregation Effects 0.000 description 6
- 239000007767 bonding agent Substances 0.000 description 6
- 239000003086 colorant Substances 0.000 description 6
- 210000003298 dental enamel Anatomy 0.000 description 6
- 238000001914 filtration Methods 0.000 description 6
- 239000001023 inorganic pigment Substances 0.000 description 6
- 239000012860 organic pigment Substances 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 238000001179 sorption measurement Methods 0.000 description 6
- 239000004094 surface-active agent Substances 0.000 description 6
- 239000000725 suspension Substances 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 125000004430 oxygen atom Chemical group O* 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000003775 Density Functional Theory Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003421 catalytic decomposition reaction Methods 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
The invention discloses a novel porous oxide ceramic, which comprises the following raw material formula in percentage by mass: 41-48% of nickel oxide, 27-34% of yttrium stabilized zirconia and 25% of pore-forming agent graphite powder, and the invention also discloses a preparation method of the novel porous oxide ceramic, which comprises the following steps: s101: firstly, adding a dispersant polyacrylic acid into superfine mixed powder of nickel oxide and yttrium-stabilized zirconia, and performing ball milling for 8-10 hours in a ball mill; s102: adding a pore-forming agent graphite powder, performing ball milling for 10 hours, and then adding a binding agent polyvinyl alcohol and a plasticizer polyethylene glycol, and performing ball milling for 12 hours; s103: and granulating the slurry obtained in the step S102 by using centrifugal granulation drying equipment, and sintering the slurry after cold isostatic pressing to obtain the novel porous oxide ceramic. The invention endows the product with more performances by changing the ceramic formula, not only plays the roles of structural support and carrier, but also endows the porous ceramic material with the catalytic function, and prolongs the service life of the product.
Description
Technical Field
The invention relates to the technical field of preparation of porous ceramics, in particular to novel porous oxide ceramics and a preparation method thereof.
Background
The porous ceramic material is prepared by taking high-quality raw materials such as corundum, silicon carbide, cordierite and the like as main materials through molding and a special high-temperature sintering process, has the advantages of high temperature resistance, high pressure resistance, acid corrosion resistance, alkali corrosion resistance and organic medium corrosion resistance, good biological inertia, controllable pore structure, high open porosity, long service life, good product regeneration performance and the like, and can be suitable for precise filtration and separation of various media, high-pressure gas exhaust and noise reduction, gas distribution, electrolytic diaphragms and the like.
At present, porous ceramics on the market only play a role as a carrier in gas filtration, and particularly, a filter element must be replaced or reverse osmosis cleaning and catalyst adding must be carried out again at intervals in the filtration of automobile exhaust. This undoubtedly increases the investment in cost.
Disclosure of Invention
The invention aims to provide a novel porous oxide ceramic and a preparation method thereof, which endow a product with more performances through the change of a ceramic formula, so that the original porous ceramic material not only plays the roles of a structural support and a carrier but also endows the porous ceramic material with a catalytic effect in the field of filtration by virtue of excellent performances, thereby prolonging the service life of the product and solving the problems provided in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a novel porous oxide ceramic comprises the following raw material formula in percentage by mass:
41-48% of nickel oxide, 27-34% of yttrium-stabilized zirconia and 25% of pore-forming agent graphite powder.
In some embodiments, the nickel oxide has a particle diameter D50 of 0.6um, the yttrium stabilized zirconia has a particle diameter D50 of 0.3um, and the pore former graphite powder has a particle diameter D50 of 5 um.
In some embodiments, the yttrium-stabilized zirconia has a molar fraction of yttria of 8%.
In some embodiments, the raw material formulation is selected from purified water as a solvent, polyvinyl alcohol (PVA-1788) as a binder, polyethylene glycol (PEG-400) as a plasticizer, and polyacrylic acid (PAA) as a dispersant.
In some embodiments, the polyacrylic acid (PAA) solution comprises polyacrylic acid (PAA) in a mass fraction of 25%.
According to another aspect of the present invention, there is provided a method for preparing a novel porous oxide ceramic, comprising the steps of:
s101: firstly, adding a dispersant polyacrylic acid into superfine mixed powder of nickel oxide and yttrium-stabilized zirconia, and performing ball milling for 8-10 hours in a ball mill;
s102: adding a pore-forming agent graphite powder, performing ball milling for 10 hours, and then adding a binding agent polyvinyl alcohol (PVA-1788) and a plasticizer polyethylene glycol (PEG-400), and performing ball milling for 12 hours;
s103: and granulating the slurry obtained in the step S102 by using centrifugal granulation drying equipment, and sintering the slurry after cold isostatic pressing to obtain the novel porous oxide ceramic.
In some embodiments, the granulation diameter D50 of step S103 is 40 um.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, by changing the formula of the ceramic, the product is endowed with more performances, so that the original porous ceramic material can better adsorb dust and volatile matters in gas by virtue of excellent performances in the field of filtration, and the porous ceramic material not only plays roles of a structural support and a carrier, but also has a catalytic effect, and the service life of the product is prolonged.
Drawings
FIG. 1 is a flow chart of the preparation of the novel porous oxide ceramic of the present invention;
FIG. 2 is a schematic view of a porous plate made of the novel porous oxide ceramic according to one embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A novel porous oxide ceramic comprises the following raw material formula in percentage by mass:
41% of nickel oxide, 34% of yttrium-stabilized zirconia and 25% of pore-forming agent graphite powder.
The particle diameter D50 of nickel oxide is 0.6um, nickel oxide is used as the adhesion agent and colorant of enamel, the particle diameter D50 of yttrium stabilized zirconia is 0.3um, and the particle diameter D50 of pore-forming agent graphite powder is 5 um. The pore-forming agent graphite powder makes the material produce a pore structure.
The molar fraction of yttria in the yttrium-stabilized zirconia was 8%. The zirconia ceramics has better matching property with human body and has no rejection.
The raw material formula selects purified water as a solvent, polyvinyl alcohol (PVA-1788) as a bonding agent, and the polyvinyl alcohol (PVA-1788) enables nickel oxide, yttrium stabilized zirconia and pore-forming agent graphite powder to be tightly connected into a whole. Polyethylene glycol (PEG-400) is a plasticizer, and polyethylene glycol (PEG-400) increases the plasticity of the whole ceramic. Polyacrylic acid (PAA) is a dispersant, and is a surfactant having two opposite properties of lipophilicity and hydrophilicity in a molecule. The amphiphilic agent is capable of uniformly dispersing solid and liquid particles of inorganic and organic pigments which are difficult to dissolve in liquids, and also preventing settling and agglomeration of the particles to form stable suspensions.
The polyacrylic acid (PAA) contained in the polyacrylic acid (PAA) solution was 25% by mass.
Fig. 1 shows a flow chart of the preparation of the novel porous oxide ceramic of the present invention, and this example provides a preparation method of the novel porous oxide ceramic, which includes the following steps:
s101: firstly, adding a dispersant polyacrylic acid into superfine mixed powder of nickel oxide and yttrium-stabilized zirconia, and performing ball milling for 9 hours in a ball mill; so as to ball mill the superfine mixed powder of nickel oxide and yttrium stabilized zirconia into powder.
S102: adding a pore-forming agent graphite powder, performing ball milling for 10 hours, and then adding a binding agent polyvinyl alcohol (PVA-1788) and a plasticizer polyethylene glycol (PEG-400), and performing ball milling for 12 hours; the above mixture was ball milled into powder here.
S103: the slurry obtained in step S102 is granulated by a centrifugal granulation drying apparatus (granulation diameter D50 ═ 40um), and then subjected to cold isostatic pressing and sintering to obtain a novel porous oxide ceramic.
The novel porous oxide ceramic prepared by the embodiment can better adsorb dust and volatile matters in gas through tests, not only plays a role of a catalyst carrier, but also has a certain catalytic effect.
Example 2
A novel porous oxide ceramic comprises the following raw material formula in percentage by mass:
42% of nickel oxide, 33% of yttrium-stabilized zirconia and 25% of pore-forming agent graphite powder.
The particle diameter D50 of nickel oxide is 0.6um, nickel oxide is used as the adhesion agent and colorant of enamel, the particle diameter D50 of yttrium stabilized zirconia is 0.3um, and the particle diameter D50 of pore-forming agent graphite powder is 5 um. The pore-forming agent graphite powder makes the material produce a pore structure.
The molar fraction of yttria in the yttrium-stabilized zirconia was 8%. The zirconia ceramics has better matching property with human body and has no rejection.
The raw material formula selects purified water as a solvent, polyvinyl alcohol (PVA-1788) as a bonding agent, and the polyvinyl alcohol (PVA-1788) enables nickel oxide, yttrium stabilized zirconia and pore-forming agent graphite powder to be tightly connected into a whole. Polyethylene glycol (PEG-400) is a plasticizer, and polyethylene glycol (PEG-400) increases the plasticity of the whole ceramic. Polyacrylic acid (PAA) is a dispersant, and is a surfactant having two opposite properties of lipophilicity and hydrophilicity in a molecule. The amphiphilic agent is capable of uniformly dispersing solid and liquid particles of inorganic and organic pigments which are difficult to dissolve in liquids, and also preventing settling and agglomeration of the particles to form stable suspensions.
The polyacrylic acid (PAA) contained in the polyacrylic acid (PAA) solution was 25% by mass.
Fig. 1 shows a flow chart of the preparation of the novel porous oxide ceramic of the present invention, and this example provides a preparation method of the novel porous oxide ceramic, which includes the following steps:
s101: firstly, adding a dispersant polyacrylic acid into superfine mixed powder of nickel oxide and yttrium-stabilized zirconia, and performing ball milling for 8 hours in a ball mill; so as to ball mill the superfine mixed powder of nickel oxide and yttrium stabilized zirconia into powder.
S102: adding a pore-forming agent graphite powder, performing ball milling for 10 hours, and then adding a binding agent polyvinyl alcohol (PVA-1788) and a plasticizer polyethylene glycol (PEG-400), and performing ball milling for 12 hours; the above mixture was ball milled into powder here.
S103: the slurry obtained in step S102 is granulated by a centrifugal granulation drying apparatus (granulation diameter D50 ═ 40um), and then subjected to cold isostatic pressing and sintering to obtain a novel porous oxide ceramic.
The novel porous oxide ceramic prepared by the embodiment can better adsorb dust and volatile matters in gas through tests, not only plays a role of a catalyst carrier, but also has a certain catalytic effect.
Example 3
A novel porous oxide ceramic comprises the following raw material formula in percentage by mass:
43% of nickel oxide, 32% of yttrium-stabilized zirconia and 25% of pore-forming agent graphite powder.
The particle diameter D50 of nickel oxide is 0.6um, nickel oxide is used as the adhesion agent and colorant of enamel, the particle diameter D50 of yttrium stabilized zirconia is 0.3um, and the particle diameter D50 of pore-forming agent graphite powder is 5 um. The pore-forming agent graphite powder makes the material produce a pore structure.
The molar fraction of yttria in the yttrium-stabilized zirconia was 8%. The zirconia ceramics has better matching property with human body and has no rejection.
The raw material formula selects purified water as a solvent, polyvinyl alcohol (PVA-1788) as a bonding agent, and the polyvinyl alcohol (PVA-1788) enables nickel oxide, yttrium stabilized zirconia and pore-forming agent graphite powder to be tightly connected into a whole. Polyethylene glycol (PEG-400) is a plasticizer, and polyethylene glycol (PEG-400) increases the plasticity of the whole ceramic. Polyacrylic acid (PAA) is a dispersant, and is a surfactant having two opposite properties of lipophilicity and hydrophilicity in a molecule. The amphiphilic agent is capable of uniformly dispersing solid and liquid particles of inorganic and organic pigments which are difficult to dissolve in liquids, and also preventing settling and agglomeration of the particles to form stable suspensions.
The polyacrylic acid (PAA) contained in the polyacrylic acid (PAA) solution was 25% by mass.
Fig. 1 shows a flow chart of the preparation of the novel porous oxide ceramic of the present invention, and this example provides a preparation method of the novel porous oxide ceramic, which includes the following steps:
s101: firstly, adding a dispersant polyacrylic acid into superfine mixed powder of nickel oxide and yttrium-stabilized zirconia, and performing ball milling for 10 hours in a ball mill; so as to ball mill the superfine mixed powder of nickel oxide and yttrium stabilized zirconia into powder.
S102: adding a pore-forming agent graphite powder, performing ball milling for 10 hours, and then adding a binding agent polyvinyl alcohol (PVA-1788) and a plasticizer polyethylene glycol (PEG-400), and performing ball milling for 12 hours; the above mixture was ball milled into powder here.
S103: the slurry obtained in step S102 is granulated by a centrifugal granulation drying apparatus (granulation diameter D50 ═ 40um), and then subjected to cold isostatic pressing and sintering to obtain a novel porous oxide ceramic.
The novel porous oxide ceramic prepared by the embodiment can better adsorb dust and volatile matters in gas through tests, not only plays a role of a catalyst carrier, but also has a certain catalytic effect.
Example 4
A novel porous oxide ceramic comprises the following raw material formula in percentage by mass:
44% of nickel oxide, 31% of yttrium-stabilized zirconia and 25% of pore-forming agent graphite powder.
The particle diameter D50 of nickel oxide is 0.6um, nickel oxide is used as the adhesion agent and colorant of enamel, the particle diameter D50 of yttrium stabilized zirconia is 0.3um, and the particle diameter D50 of pore-forming agent graphite powder is 5 um. The pore-forming agent graphite powder makes the material produce a pore structure.
The molar fraction of yttria in the yttrium-stabilized zirconia was 8%. The zirconia ceramics has better matching property with human body and has no rejection.
The raw material formula selects purified water as a solvent, polyvinyl alcohol (PVA-1788) as a bonding agent, and the polyvinyl alcohol (PVA-1788) enables nickel oxide, yttrium stabilized zirconia and pore-forming agent graphite powder to be tightly connected into a whole. Polyethylene glycol (PEG-400) is a plasticizer, and polyethylene glycol (PEG-400) increases the plasticity of the whole ceramic. Polyacrylic acid (PAA) is a dispersant, and is a surfactant having two opposite properties of lipophilicity and hydrophilicity in a molecule. The amphiphilic agent is capable of uniformly dispersing solid and liquid particles of inorganic and organic pigments which are difficult to dissolve in liquids, and also preventing settling and agglomeration of the particles to form stable suspensions.
The polyacrylic acid (PAA) contained in the polyacrylic acid (PAA) solution was 25% by mass.
Fig. 1 shows a flow chart of the preparation of the novel porous oxide ceramic of the present invention, and this example provides a preparation method of the novel porous oxide ceramic, which includes the following steps:
s101: firstly, adding a dispersant polyacrylic acid into superfine mixed powder of nickel oxide and yttrium-stabilized zirconia, and performing ball milling for 10 hours in a ball mill; so as to ball mill the superfine mixed powder of nickel oxide and yttrium stabilized zirconia into powder.
S102: adding a pore-forming agent graphite powder, performing ball milling for 10 hours, and then adding a binding agent polyvinyl alcohol (PVA-1788) and a plasticizer polyethylene glycol (PEG-400), and performing ball milling for 12 hours; the above mixture was ball milled into powder here.
S103: the slurry obtained in step S102 is granulated by a centrifugal granulation drying apparatus (granulation diameter D50 ═ 40um), and then subjected to cold isostatic pressing and sintering to obtain a novel porous oxide ceramic.
The novel porous oxide ceramic prepared by the embodiment can better adsorb dust and volatile matters in gas through tests, not only plays a role of a catalyst carrier, but also has a certain catalytic effect.
Example 5
A novel porous oxide ceramic comprises the following raw material formula in percentage by mass:
44.5 percent of nickel oxide, 30.5 percent of yttrium-stabilized zirconia and 25 percent of pore-forming agent graphite powder.
The particle diameter D50 of nickel oxide is 0.6um, nickel oxide is used as the adhesion agent and colorant of enamel, the particle diameter D50 of yttrium stabilized zirconia is 0.3um, and the particle diameter D50 of pore-forming agent graphite powder is 5 um. The pore-forming agent graphite powder makes the material produce a pore structure.
The molar fraction of yttria in the yttrium-stabilized zirconia was 8%. The zirconia ceramics has better matching property with human body and has no rejection.
The raw material formula selects purified water as a solvent, polyvinyl alcohol (PVA-1788) as a bonding agent, and the polyvinyl alcohol (PVA-1788) enables nickel oxide, yttrium stabilized zirconia and pore-forming agent graphite powder to be tightly connected into a whole. Polyethylene glycol (PEG-400) is a plasticizer, and polyethylene glycol (PEG-400) increases the plasticity of the whole ceramic. Polyacrylic acid (PAA) is a dispersant, and is a surfactant having two opposite properties of lipophilicity and hydrophilicity in a molecule. The amphiphilic agent is capable of uniformly dispersing solid and liquid particles of inorganic and organic pigments which are difficult to dissolve in liquids, and also preventing settling and agglomeration of the particles to form stable suspensions.
The polyacrylic acid (PAA) contained in the polyacrylic acid (PAA) solution was 25% by mass.
Fig. 1 shows a flow chart of the preparation of the novel porous oxide ceramic of the present invention, and this example provides a preparation method of the novel porous oxide ceramic, which includes the following steps:
s101: firstly, adding a dispersant polyacrylic acid into superfine mixed powder of nickel oxide and yttrium-stabilized zirconia, and performing ball milling for 8 hours in a ball mill; so as to ball mill the superfine mixed powder of nickel oxide and yttrium stabilized zirconia into powder.
S102: adding a pore-forming agent graphite powder, performing ball milling for 10 hours, and then adding a binding agent polyvinyl alcohol (PVA-1788) and a plasticizer polyethylene glycol (PEG-400), and performing ball milling for 12 hours; the above mixture was ball milled into powder here.
S103: the slurry obtained in step S102 is granulated by a centrifugal granulation drying apparatus (granulation diameter D50 ═ 40um), and then subjected to cold isostatic pressing and sintering to obtain a novel porous oxide ceramic.
The novel porous oxide ceramic prepared by the embodiment can better adsorb dust and volatile matters in gas through tests, not only plays a role of a catalyst carrier, but also has a certain catalytic effect.
Example 6
A novel porous oxide ceramic comprises the following raw material formula in percentage by mass:
48% of nickel oxide, 27% of yttrium-stabilized zirconia and 25% of pore-forming agent graphite powder.
The particle diameter D50 of nickel oxide is 0.6um, nickel oxide is used as the adhesion agent and colorant of enamel, the particle diameter D50 of yttrium stabilized zirconia is 0.3um, and the particle diameter D50 of pore-forming agent graphite powder is 5 um. The pore-forming agent graphite powder makes the material produce a pore structure.
The molar fraction of yttria in the yttrium-stabilized zirconia was 8%. The zirconia ceramics has better matching property with human body and has no rejection.
The raw material formula selects purified water as a solvent, polyvinyl alcohol (PVA-1788) as a bonding agent, and the polyvinyl alcohol (PVA-1788) enables nickel oxide, yttrium stabilized zirconia and pore-forming agent graphite powder to be tightly connected into a whole. Polyethylene glycol (PEG-400) is a plasticizer, and polyethylene glycol (PEG-400) increases the plasticity of the whole ceramic. Polyacrylic acid (PAA) is a dispersant, and is a surfactant having two opposite properties of lipophilicity and hydrophilicity in a molecule. The amphiphilic agent is capable of uniformly dispersing solid and liquid particles of inorganic and organic pigments which are difficult to dissolve in liquids, and also preventing settling and agglomeration of the particles to form stable suspensions.
The polyacrylic acid (PAA) contained in the polyacrylic acid (PAA) solution was 25% by mass.
Fig. 1 shows a flow chart of the preparation of the novel porous oxide ceramic of the present invention, and this example provides a preparation method of the novel porous oxide ceramic, which includes the following steps:
s101: firstly, adding a dispersant polyacrylic acid into superfine mixed powder of nickel oxide and yttrium-stabilized zirconia, and performing ball milling for 9 hours in a ball mill; so as to ball mill the superfine mixed powder of nickel oxide and yttrium stabilized zirconia into powder.
S102: adding a pore-forming agent graphite powder, performing ball milling for 10 hours, and then adding a binding agent polyvinyl alcohol (PVA-1788) and a plasticizer polyethylene glycol (PEG-400), and performing ball milling for 12 hours; the above mixture was ball milled into powder here.
S103: the slurry obtained in step S102 is granulated by a centrifugal granulation drying apparatus (granulation diameter D50 ═ 40um), and then subjected to cold isostatic pressing and sintering to obtain a novel porous oxide ceramic.
The novel porous oxide ceramic prepared by the embodiment can better adsorb dust and volatile matters in gas through tests, not only plays a role of a catalyst carrier, but also has a certain catalytic effect.
The novel porous oxide ceramic prepared by the 6 embodiments not only plays the roles of structural support and carrier, but also has the catalytic effect on the porous ceramic material, and the service life of the product is prolonged.
In the invention, N2The principle of catalysis of O by NiO: simulation of N by means of the Densityfunctional Theory (Densityfunctional Theory) of quantum chemistry generalized gradient and the periodic plate model method2And (3) adsorption and catalytic decomposition of O on the NiO surface. N is a radical of2The process of adsorbing the O molecules on the NiO surface is not vertical to the NiO surface, but has an inclined angle, and the adsorption process is a physical adsorption process. In the currently searched transition state, N exists2The O molecule is adsorbed with two adsorption configurations of an oxygen end downward (O down) and a nitrogen end downward (N down), which are respectively N2The configuration is more stable than this because the O atom and N atom of O are adsorbed to the O atom on the NiO (100) surface, and the adsorption energy is lower when the oxygen end is down (O down). From N2The adsorption points of O molecules on the NiO (100) surface are observed, and the O sites and N on the NiO (100) surface2O moleculeSo that N is N2The O molecules decompose and form adsorbed O atoms and nitrogen. Subsequently adsorbing the atom O to another N2Binding of O molecules to form N2And O2Escaping from the surface.
Fig. 2 shows a schematic diagram of a porous plate made of the novel porous oxide ceramic of the present invention, which can well adsorb dust and volatile matters in gas, and not only functions as a catalyst carrier, but also has a certain catalytic effect.
In other embodiments, the novel porous oxide ceramics can also be made into porous cylindrical structures.
According to the invention, the formula of the ceramic is changed, so that the product has more performances, the original porous ceramic material can better adsorb dust and volatile matters in gas by virtue of excellent performances in the field of filtration, the porous ceramic material not only plays the roles of structural support and carrier, but also has the catalytic effect, and the service life of the product is prolonged.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (7)
1. The novel porous oxide ceramic is characterized by comprising the following raw material formula in percentage by mass:
41-48% of nickel oxide, 27-34% of yttrium-stabilized zirconia and 25% of pore-forming agent graphite powder.
2. The novel porous oxide ceramic of claim 1, wherein the nickel oxide has a particle diameter D50 ═ 0.6um, the yttrium stabilized zirconia has a particle diameter D50 ═ 0.3um, and the pore former graphite powder has a particle diameter D50 ═ 5 um.
3. The novel porous oxide ceramic of claim 1, wherein the yttrium-stabilized zirconia has a molar fraction of yttrium oxide of 8%.
4. The novel porous oxide ceramic of claim 1, wherein the raw material formula is selected from purified water as a solvent, polyvinyl alcohol (PVA-1788) as a binder, polyethylene glycol (PEG-400) as a plasticizer, and polyacrylic acid (PAA) as a dispersant.
5. The novel porous oxide ceramic according to claim 4, wherein the polyacrylic acid (PAA) solution contains polyacrylic acid (PAA) in a mass fraction of 25%.
6. The method for preparing a novel porous oxide ceramic according to any one of claims 1 to 5, comprising the steps of:
s101: firstly, adding a dispersant polyacrylic acid into superfine mixed powder of nickel oxide and yttrium-stabilized zirconia, and performing ball milling for 8-10 hours in a ball mill;
s102: adding a pore-forming agent graphite powder, performing ball milling for 10 hours, and then adding a binding agent polyvinyl alcohol (PVA-1788) and a plasticizer polyethylene glycol (PEG-400), and performing ball milling for 12 hours;
s103: and granulating the slurry obtained in the step S102 by using centrifugal granulation drying equipment, and sintering the slurry after cold isostatic pressing to obtain the novel porous oxide ceramic.
7. The method of claim 6, wherein the granulation diameter D50 of step S103 is 40 μm.
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| US20040033886A1 (en) * | 2000-06-30 | 2004-02-19 | Dimitrios Simwonis | Method for producing an electrode that has a temperature-stabilized conductivity |
| CN103236548A (en) * | 2013-04-27 | 2013-08-07 | 华南理工大学 | Preparation method of multihole anode support of solid oxide fuel cell |
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Application publication date: 20200619 |