CN112939582B - Zirconia-doped alumina ceramic and preparation method thereof - Google Patents
Zirconia-doped alumina ceramic and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the field of ceramic materials, and provides zirconia-doped alumina ceramic and a preparation method thereof, wherein the alumina ceramic is prepared from the following raw materials in parts by weight: 75-95 parts of alumina powder, 5-15 parts of zirconia, 2-6 parts of aluminum borate whiskers, 6-12 parts of a sintering aid, 0.8-2 parts of a dispersing agent, 2.1-8.4 parts of a binder and 18-36 parts of a solvent, wherein the sintering aid is a mixture of titanium dioxide and alkali-free aluminosilicate glass. The method solves the problem that the prior art adopts a single toughening mode and cannot meet the requirement of high-quality ceramic materials.
Description
Technical Field
The invention relates to the field of ceramic materials, in particular to zirconia-doped alumina ceramic and a preparation method thereof.
Background
The structural ceramic material is favored by a plurality of fields such as medical treatment, aerospace, new energy, engines, cutting tools, electronic information and the like by virtue of a plurality of excellent properties such as high hardness, high strength, high temperature resistance, corrosion resistance, wear resistance, good chemical stability and the like, and becomes an indispensable key material in the industrial technology field and human daily life. However, structural ceramics have the disadvantage of being brittle, and brittle fracture can occur without any indication, which greatly limits the use of ceramic materials, especially on a large scale in important components. The alumina ceramic is the most researched and most widely applied oxide ceramic in the current new materials, and the improvement of the fracture toughness of the alumina ceramic has great significance for wider application.
Chinese patent application No.: 201811290039.6 discloses an alumina complex phase ceramic insulator and a preparation method thereof, the raw materials for preparing the alumina complex phase ceramic insulator comprise alpha-phase alumina, nanometer zirconia and sintering aids, the weight of the nanometer zirconia accounts for 15-35% of the sum of the weight of the alpha-phase alumina and the nanometer zirconia, the weight of the sintering aids accounts for 8-10% of the sum of the weight of the alpha-phase alumina and the nanometer zirconia, and the sintering aids comprise yttrium oxide, calcium oxide and magnesium oxide. The alumina complex phase ceramic insulator is prepared by alpha-Al2O3Adding proper amount of nano zirconia and sintering aid into matrix material, utilizing ZrO2Increasing Al content by phase transformation toughening2O3Fracture toughness of complex phase ceramic insulatorPerformance and thermal shock resistance of Al2O3The complex phase ceramic insulator has good thermal shock resistance and high mechanical strength. Various toughening modes can improve the fracture toughness of the ceramic material, but all have certain defects, such as the toughening effect of particle dispersion toughening is not obvious; for example, phase change toughening is very sensitive to temperature, and the toughening effect is lost at high temperature; for example, the whisker toughening has the problems of complex dispersion process, difficult sintering densification and complex interface compatibility of a reinforcing phase and a matrix.
Disclosure of Invention
Therefore, aiming at the content, the invention provides the alumina ceramic doped with zirconia, which utilizes the zirconia and the aluminum borate whisker to synergistically toughen the alumina ceramic material, further improves the toughening effect and overcomes the defects of a single toughening mode in the prior art.
Another object of the present invention is to provide a method for preparing the zirconia-doped alumina ceramic.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the alumina ceramic doped with zirconia is prepared from the following raw materials in parts by weight: 75-95 parts of alumina powder, 5-15 parts of zirconia, 2-6 parts of aluminum borate whisker, 6-12 parts of sintering aid, 0.8-2 parts of dispersant, 2.1-8.4 parts of binder and 18-36 parts of solvent, wherein the sintering aid is a mixture of titanium dioxide and alkali-free aluminosilicate glass, the zirconia is yttria-stabilized zirconia, and the alumina powder is alpha-alumina.
The further improvement is that: the alkali-free aluminum-silicon glass consists of aluminum oxide, silicon dioxide and zinc oxide, and the ratio of each component is as follows: 20-25 wt.% of aluminum oxide, 56-64 wt.% of silicon dioxide and 11-24 wt.% of zinc oxide.
The further improvement is that: the mass ratio of the titanium dioxide to the alkali-free aluminum-silicon glass is 1: 0.8 to 2.
The further improvement is that: the binder is one or a mixture of more than two of polyvinyl alcohol, polyvinyl butyral and carboxypropyl methyl cellulose.
The further improvement is that: the dispersing agent is any one of sodium polyacrylate, naphthenic oil and polyethylene glycol.
The further improvement is that: the solvent is one or a mixture of more than two of isopropanol, butyl acetate and ethanol.
The further improvement is that: the raw material of the alumina ceramic also comprises 1.5-6 parts of a plasticizer.
The invention also provides a preparation method of the alumina ceramic, which comprises the following steps:
(1) weighing the raw materials according to the formula proportion for later use;
(2) adding alumina powder, zirconia, aluminum borate whiskers, a sintering aid, a solvent and a dispersing agent into a ball mill, performing ball milling dispersion for 12-20 h, adding an adhesive, and continuing ball milling for 24-36 h;
(3) vacuumizing and defoaming the ball-milled materials by using a vacuum defoaming machine to obtain ceramic slurry with the viscosity of more than or equal to 15000mPa & s;
(4) carrying out tape casting on the ceramic slurry obtained in the step (3) to obtain a ceramic green body, and cutting the ceramic green body into a required shape and size by using a mold to obtain a ceramic green sheet;
(5) Coating a layer of adhesive powder on the surface of the ceramic blank sheet, laminating the ceramic blank sheet, preheating the ceramic blank sheet at the temperature of 130-150 ℃ for 80-120 min, and then putting the ceramic blank sheet into a glue discharging furnace for vacuum glue discharging;
(6) sintering the ceramic blank sheet subjected to vacuum binder removal at 1560-1620 ℃ for 4-8 h to obtain the zirconia-doped alumina ceramic.
The further improvement is that: the vacuum glue discharging in the step (5) comprises the following specific steps: heating to 250-300 ℃ at the speed of 10-12 ℃/min, then preserving heat for 2-3 h, heating to 400-450 ℃ at the speed of 6-8 ℃/min, then preserving heat for 1-2 h, heating to 500-600 ℃ at the speed of 2-4 ℃/min, and then preserving heat for 30-60 min.
The further improvement is that: the zirconia is subjected to surface modification before ball milling, and the method comprises the following specific steps: coupling agent and organic solvent according to the proportion of 1: preparing a solution by the mass ratio of 20, adding zirconium oxide into the solution, stirring and reacting for 40-100 min, then oscillating for 20-40 min by ultrasonic waves, filtering, washing and drying to obtain the surface modified zirconium oxide.
The further improvement is that: the mass ratio of the zirconium oxide to the coupling agent is 5-10: 1.
the further improvement is that: and (3) adding a plasticizer while adding the adhesive in the step (2), and then carrying out ball milling.
The further improvement is that: and (3) carrying out isostatic pressing treatment before coating a layer of adhesive powder on the surface of the ceramic blank sheet, wherein the isostatic pressing treatment is to carry out vacuum packaging and sealing on the ceramic blank sheet, then boosting the pressure to 180-220 MPa, and keeping the pressure for 8-15 min.
By adopting the technical scheme, the invention has the beneficial effects that:
1. zirconia belongs to oxides with polycrystalline phase conversion, has three forms under normal pressure, sequentially comprises a cubic phase, a tetragonal phase and a monoclinic phase from a high temperature to a low temperature, and is converted into a metastable tetragonal crystal form from the monoclinic crystal form when the temperature reaches about 1170 ℃. When cooled, the crystal changes reversely, and is converted into monoclinic crystal form again from tetragonal crystal form, and certain volume expansion and shear strain are accompanied. Through stabilizing treatment on the zirconium oxide, the phase change of the zirconium oxide is inhibited, the tetragonal phase is kept in the matrix at room temperature, when the matrix is acted by external force, the zirconium oxide is triggered to be converted from the tetragonal phase to the monoclinic phase, external energy is absorbed, the expansion of cracks is prevented or the cracks are deflected and forked, and most of energy of the tips and fracture surfaces of the cracks can be absorbed in the phase change process, so that the effect of improving the fracture toughness is achieved. The invention utilizes yttria to stabilize zirconia, the yttria can enter zirconia crystal lattices and has certain fixed rolling effect to limit the transformation of the crystal forms of the zirconia, thereby obtaining the zirconia containing tetragonal phase at room temperature. The aluminum borate whisker has high strength and high elastic modulus, can share most of external stress for a matrix, can block continuous expansion of cracks, can dissipate energy in a pulling-out mode when locally breaking, and has the effect of improving the fracture toughness. Compared with the alumina ceramics toughened by independently adding zirconia and aluminum borate whiskers, the alumina ceramics toughened by independently adding zirconia and aluminum borate whiskers has better toughening effect and obviously better mechanical property than the alumina ceramics prepared by independently adding zirconia and aluminum borate whiskers, and the effect of 1+1 is more than 2.
Both alumina and zirconia have excellent chemical stability and poor sintering activity, so high-temperature sintering is required, but the phase change toughening effect of zirconia is obviously reduced along with the gradual rise of temperature, and a contradiction exists between the two. Therefore, by introducing a proper sintering aid, the diffusion rate of the substances can be obviously improved, the purpose of promoting sintering is achieved, the sintering temperature can be reduced, and the adverse effect of the temperature on the toughening effect of the zirconia is reduced to the maximum extent. Titanium dioxide as a sintering aid can promote sintering of alumina ceramics, which is well known in the art, but the mere addition of titanium dioxide may cause excessive grain growth resulting in a decrease in mechanical properties. According to the invention, the alkali-free aluminosilicate glass and titanium dioxide are added as composite sintering aids, so that the sintering temperature of the alumina ceramic is reduced, and the mechanical properties of the material are not weakened.
2. The good or bad dispersibility of the zirconia in the matrix determines the effect of the phase-change toughened alumina ceramic and also influences the mechanical strength of the alumina ceramic material. According to the invention, the surface modification is carried out on the zirconia before ball milling, so that the dispersion degree of the zirconia in a matrix is improved, the densification of the material is improved, and the method is beneficial to obtaining a product with excellent comprehensive performance.
3. The binder removal treatment is carried out before sintering, organic matters and water in the ceramic body can be effectively removed, a vacuum binder removal mode is further selected, the organic matters are directly decomposed in a vacuum environment, oxidation cannot occur to generate carbon residue, sintering is facilitated, and the densification degree of the material is improved. The sectional type heating is adopted for glue discharging, so that organic matters in the ceramic body can be effectively removed, the ceramic body can be ensured to uniformly shrink in the glue discharging process, and the phenomena of deformation, collapse and overlarge porosity of a product caused by instantaneous too fast discharging are avoided.
4. The isostatic pressing treatment is carried out before the surface of the ceramic blank sheet is coated with a layer of adhesive powder, and the cold isostatic pressing treatment is carried out before the green body is subjected to binder removal and sintering, so that the density of the ceramic blank sheet can be improved, the subsequent sintering process is facilitated, and the alumina ceramic with high density and good mechanical property is obtained.
In a word, the invention obtains the ceramic substrate with excellent comprehensive performance by adjusting and optimizing the formula of the alumina ceramic and improving the production process, and is different from the prior art that although the performance of some aspects is improved, the adverse effect on other aspects is neglected.
Detailed Description
The following detailed description will be given with reference to specific embodiments, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented.
Unless otherwise indicated, the techniques employed in the examples are conventional and well known to those skilled in the art, and the reagents and products employed are also commercially available.
Example one
The alumina ceramic doped with zirconia is prepared from the following raw materials in parts by weight: 75 parts of alpha-alumina, 5 parts of yttria-stabilized zirconia, 2 parts of aluminum borate whisker, 2.4 parts of titanium dioxide, 3.6 parts of alkali-free aluminosilicate glass, 0.8 part of sodium polyacrylate, 2.1 parts of polyvinyl alcohol, 18 parts of isopropanol and 1.5 parts of dimethyl phthalate, wherein the alkali-free aluminosilicate glass comprises the following raw materials in percentage by mass: 20 wt.% alumina, 56 wt.% silica, 24 wt.% zinc oxide.
A preparation method of zirconia-doped alumina ceramic comprises the following steps:
(1) weighing the raw materials according to the formula proportion for later use;
(2) coupling agent and ethanol are mixed according to the proportion of 1: preparing a solution by 20 mass ratio, adding yttria-stabilized zirconia into the solution, wherein the mass ratio of the yttria-stabilized zirconia to the coupling agent is 5: 1, stirring and reacting for 40min, then oscillating for 20min by ultrasonic waves, filtering, washing and drying to obtain surface-modified zirconia;
(3) Adding alpha-alumina, surface-modified zirconia, aluminum borate whisker, titanium dioxide, alkali-free aluminosilicate glass, isopropanol and sodium polyacrylate into a ball mill, performing ball milling dispersion for 12 hours, adding polyvinyl alcohol and dimethyl phthalate, and continuing ball milling for 24 hours;
(4) vacuumizing and defoaming the ball-milled materials by using a vacuum defoaming machine to obtain ceramic slurry with the viscosity of more than or equal to 15000mPa & s;
(5) carrying out tape casting on the ceramic slurry obtained in the step (4) to obtain a ceramic green body, and cutting the ceramic green body into a required shape and size by using a mold to obtain a ceramic green sheet;
(6) the method comprises the following steps of carrying out vacuum packaging and sealing on ceramic blank sheets, then boosting the pressure to 180MPa, maintaining the pressure for 8min, then coating a layer of adhesive powder on the surfaces of the ceramic blank sheets, laminating the ceramic blank sheets, carrying out preheating treatment at the temperature of 130 ℃ for 80min, and then placing the ceramic blank sheets into a glue discharging furnace for vacuum glue discharging, wherein the specific steps of the vacuum glue discharging are as follows: firstly heating to 250 ℃ at the speed of 10 ℃/min, then preserving heat for 2h, then heating to 400 ℃ at the speed of 6 ℃/min, then preserving heat for 1h, then heating to 500 ℃ at the speed of 2 ℃/min, and then preserving heat for 30 min;
(7) sintering the ceramic green sheet subjected to vacuum binder removal at 1560 ℃ for 8h to obtain the zirconia-doped alumina ceramic.
Example two
The alumina ceramic doped with zirconia is prepared from the following raw materials in parts by weight: 85 parts of alpha-alumina, 10 parts of yttria-stabilized zirconia, 4 parts of aluminum borate whisker, 5 parts of titanium dioxide, 4 parts of alkali-free aluminum-silicon glass, 1.5 parts of naphthenic oil, 5 parts of polyvinyl butyral, 27 parts of butyl acetate and 4 parts of diethyl phthalate, wherein the alkali-free aluminum-silicon glass comprises the following raw materials in percentage by mass: 22 wt.% alumina, 60 wt.% silica, 18 wt.% zinc oxide.
A preparation method of zirconia-doped alumina ceramic comprises the following steps:
(1) weighing the raw materials according to the formula proportion for later use;
(2) coupling agent and ethanol are mixed according to the proportion of 1: preparing a solution by 20 mass ratio, adding yttria-stabilized zirconia into the solution, wherein the mass ratio of the yttria-stabilized zirconia to the coupling agent is 8: 1, stirring and reacting for 70min, then oscillating for 30min by ultrasonic waves, filtering, washing and drying to obtain surface-modified zirconia;
(3) adding alpha-alumina, surface-modified zirconia, aluminum borate whiskers, titanium dioxide, alkali-free aluminosilicate glass, butyl acetate and naphthenic oil into a ball mill, performing ball milling dispersion for 16 hours, adding polyvinyl butyral and diethyl phthalate, and continuing ball milling for 30 hours;
(4) Vacuumizing and defoaming the ball-milled materials by using a vacuum defoaming machine to obtain ceramic slurry with the viscosity of more than or equal to 15000mPa & s;
(5) carrying out tape casting on the ceramic slurry obtained in the step (4) to obtain a ceramic green body, and cutting the ceramic green body into a required shape and size by using a mold to obtain a ceramic green sheet;
(6) carrying out vacuum packaging and sealing on the ceramic blank sheet, then boosting the pressure to 200MPa, maintaining the pressure for 12min, then coating a layer of adhesive powder on the surface of the ceramic blank sheet, laminating the ceramic blank sheet, carrying out preheating treatment at 140 ℃ for 100min, then placing the ceramic blank sheet into a glue discharging furnace for vacuum glue discharging, wherein the vacuum glue discharging comprises the following specific steps: firstly heating to 280 ℃ at the speed of 11 ℃/min, then preserving heat for 2.5h, then heating to 420 ℃ at the speed of 7 ℃/min, then preserving heat for 1.5h, then heating to 550 ℃ at the speed of 3 ℃/min, and then preserving heat for 45 min;
(7) and sintering the ceramic blank sheet subjected to vacuum binder removal at 1600 ℃ for 6h to obtain the zirconia-doped alumina ceramic.
EXAMPLE III
The alumina ceramic doped with zirconia is prepared from the following raw materials in parts by weight: 95 parts of alpha-alumina, 15 parts of yttria-stabilized zirconia, 6 parts of aluminum borate whisker, 4 parts of titanium dioxide, 8 parts of alkali-free aluminum silicon glass, 2 parts of polyethylene glycol, 8.4 parts of carboxypropyl methyl cellulose, 36 parts of ethanol and 6 parts of trioctyl phosphate, wherein the alkali-free aluminum silicon glass comprises the following raw materials in percentage by mass: 25 wt.% alumina, 64 wt.% silica, 11 wt.% zinc oxide.
A preparation method of zirconia-doped alumina ceramic comprises the following steps:
(1) weighing the raw materials according to the formula proportion for later use;
(2) coupling agent and ethanol are mixed according to the proportion of 1: preparing a solution by 20 mass ratio, adding yttria-stabilized zirconia into the solution, wherein the mass ratio of the yttria-stabilized zirconia to the coupling agent is 10: 1, stirring and reacting for 100min, then oscillating for 40min by ultrasonic waves, filtering, washing and drying to obtain surface-modified zirconia;
(3) adding alumina powder, surface-modified zirconia, aluminum borate whisker, titanium dioxide, alkali-free aluminosilicate glass, ethanol and polyethylene glycol into a ball mill, performing ball milling dispersion for 20 hours, adding carboxypropyl methyl cellulose and trioctyl phosphate, and continuing ball milling for 36 hours;
(4) vacuumizing and defoaming the ball-milled materials by using a vacuum defoaming machine to obtain ceramic slurry with the viscosity of more than or equal to 15000mPa & s;
(5) carrying out tape casting on the ceramic slurry obtained in the step (4) to obtain a ceramic green body, and cutting the ceramic green body into a required shape and size by using a mold to obtain a ceramic green sheet;
(6) the method comprises the following steps of carrying out vacuum packaging and sealing on ceramic blank sheets, then boosting the pressure to 220MPa, maintaining the pressure for 15min, then coating a layer of adhesive powder on the surfaces of the ceramic blank sheets, laminating the ceramic blank sheets, carrying out preheating treatment at the temperature of 150 ℃ for 120min, and then placing the ceramic blank sheets into a glue discharging furnace for vacuum glue discharging, wherein the specific steps of the vacuum glue discharging are as follows: firstly heating up to 300 ℃ at the speed of 12 ℃/min, then preserving heat for 3h, then heating up to 450 ℃ at the speed of 8 ℃/min, then preserving heat for 2h, then heating up to 600 ℃ at the speed of 4 ℃/min, and then preserving heat for 60 min;
(7) Sintering the ceramic blank sheet subjected to vacuum binder removal at 1620 ℃ for 4h to obtain the zirconia-doped alumina ceramic.
EXAMPLE four (omitting isostatic pressing)
The alumina ceramic doped with zirconia is prepared from the following raw materials in parts by weight: 75 parts of alpha-alumina, 5 parts of yttria-stabilized zirconia, 2 parts of aluminum borate whisker, 2.4 parts of titanium dioxide, 3.6 parts of alkali-free aluminosilicate glass, 0.8 part of sodium polyacrylate, 2.1 parts of polyvinyl alcohol, 18 parts of isopropanol and 1.5 parts of dimethyl phthalate, wherein the alkali-free aluminosilicate glass comprises the following raw materials in percentage by mass: 20 wt.% alumina, 56 wt.% silica, 24 wt.% zinc oxide.
In the preparation process, a layer of adhesive powder is directly coated on the surface of the ceramic blank without isostatic pressing treatment, and other steps are consistent with the embodiment.
EXAMPLE five (without addition of aluminium borate whiskers)
The alumina ceramic doped with zirconia is prepared from the following raw materials in parts by weight: 75 parts of alpha-alumina, 7 parts of yttria-stabilized zirconia, 2.4 parts of titanium dioxide, 3.6 parts of alkali-free aluminosilicate glass, 0.8 part of sodium polyacrylate, 2.1 parts of polyvinyl alcohol, 18 parts of isopropanol and 1.5 parts of dimethyl phthalate, wherein the alkali-free aluminosilicate glass comprises the following raw materials in percentage by mass: 20 wt.% alumina, 56 wt.% silica, 24 wt.% zinc oxide.
The preparation method steps are consistent with the embodiment.
EXAMPLE six (without zirconia addition)
The alumina ceramic doped with zirconia is prepared from the following raw materials in parts by weight: 75 parts of alpha-alumina, 7 parts of aluminum borate whisker, 2.4 parts of titanium dioxide, 3.6 parts of alkali-free aluminosilicate glass, 0.8 part of sodium polyacrylate, 2.1 parts of polyvinyl alcohol, 18 parts of isopropanol and 1.5 parts of dimethyl phthalate, wherein the alkali-free aluminosilicate glass consists of the following raw materials in percentage by mass: 20 wt.% alumina, 56 wt.% silica, 24 wt.% zinc oxide.
The preparation method steps are consistent with the embodiment.
EXAMPLE seven (Alkaleless aluminosilicate glass)
The alumina ceramic doped with zirconia is prepared from the following raw materials in parts by weight: 75 parts of alpha-alumina, 5 parts of yttria-stabilized zirconia, 2 parts of aluminum borate whisker, 6 parts of titanium dioxide, 0.8 part of sodium polyacrylate, 2.1 parts of polyvinyl alcohol, 18 parts of isopropanol and 1.5 parts of dimethyl phthalate, wherein the alkali-free aluminosilicate glass comprises the following raw materials in percentage by mass: 20 wt.% alumina, 56 wt.% silica, 24 wt.% zinc oxide.
The preparation method has the same steps as the embodiment.
Performance testing
The alumina ceramics prepared in each embodiment are subjected to performance detection in the aspects of density, bending strength, hardness and fracture toughness, wherein the compactness is tested by GB/T25995-2010 Fine ceramic density and apparent porosity test method, the bending strength is tested by GB/T6569-2006 Fine ceramic bending strength test method, the fracture toughness is tested by a single-side notched beam method, the hardness is tested by an ASTME 384-17 nano indentation method, and the test results are shown in Table 1.
TABLE 1
The above description is only an embodiment utilizing the technical content of the present disclosure, and any modification and variation made by those skilled in the art can be covered by the claims of the present disclosure, and not limited to the embodiments disclosed.
Claims (10)
1. A zirconia-doped alumina ceramic characterized by: the alumina ceramic is prepared from the following raw materials in parts by weight: 75-95 parts of alumina powder, 5-15 parts of zirconia, 2-6 parts of aluminum borate whisker, 6-12 parts of sintering aid, 0.8-2 parts of dispersant, 2.1-8.4 parts of binder and 18-36 parts of solvent, wherein the sintering aid is a mixture of titanium dioxide and alkali-free aluminosilicate glass, the alkali-free aluminosilicate glass consists of alumina, silicon dioxide and zinc oxide, the zirconia is yttria-stabilized zirconia, and the alumina powder is alpha-alumina.
2. The zirconia doped alumina ceramic of claim 1, wherein: the alkali-free aluminosilicate glass comprises the following components in percentage by weight: 20-25 wt.% of aluminum oxide, 56-64 wt.% of silicon dioxide and 11-24 wt.% of zinc oxide.
3. The zirconia doped alumina ceramic of claim 1, wherein: the mass ratio of the titanium dioxide to the alkali-free aluminum-silicon glass is 1: 0.8 to 2.
4. The zirconia doped alumina ceramic of claim 1, wherein: the binder is a mixture of one or more than two of polyvinyl alcohol, polyvinyl butyral and carboxypropyl methyl cellulose mixed in any ratio.
5. The zirconia doped alumina ceramic of claim 1, wherein: the dispersing agent is any one of sodium polyacrylate, naphthenic oil and polyethylene glycol.
6. The zirconia doped alumina ceramic of claim 1, wherein: the solvent is one or a mixture of more than two of isopropanol, butyl acetate and ethanol mixed according to any ratio.
7. The zirconia doped alumina ceramic of claim 1, wherein: the raw material of the alumina ceramic also comprises 1.5-6 parts by weight of a plasticizer.
8. A method of preparing the zirconia doped alumina ceramic of claim 1, wherein: the method comprises the following steps:
(1) weighing the raw materials according to the formula proportion for later use;
(2) adding alumina powder, zirconia, aluminum borate whiskers, a sintering aid, a solvent and a dispersing agent into a ball mill, performing ball milling dispersion for 12-20 h, adding an adhesive, and continuing ball milling for 24-36 h;
(3) vacuumizing and defoaming the ball-milled materials by using a vacuum defoaming machine to obtain ceramic slurry with the viscosity of more than or equal to 15000mPa & s;
(4) carrying out tape casting on the ceramic slurry obtained in the step (3) to obtain a ceramic green body, and cutting the ceramic green body into a required shape and size by using a die to obtain a ceramic green sheet;
(5) coating a layer of adhesive powder on the surface of the ceramic blank sheet, laminating the ceramic blank sheet, preheating the ceramic blank sheet at the temperature of 130-150 ℃ for 80-120 min, and then putting the ceramic blank sheet into a glue discharging furnace for vacuum glue discharging;
(6) sintering the ceramic blank sheet subjected to vacuum binder removal at 1560-1620 ℃ for 4-8 h to obtain the zirconia-doped alumina ceramic.
9. The method of claim 8, wherein the alumina ceramic doped with zirconia is prepared by: the vacuum glue discharging in the step (5) comprises the following specific steps: heating to 250-300 ℃ at the speed of 10-12 ℃/min, then preserving heat for 2-3 h, heating to 400-450 ℃ at the speed of 6-8 ℃/min, then preserving heat for 1-2 h, heating to 500-600 ℃ at the speed of 2-4 ℃/min, and then preserving heat for 30-60 min.
10. The method of claim 8, wherein the alumina ceramics doped with zirconia is prepared by: the zirconia is subjected to surface modification before ball milling, and the method comprises the following specific steps: coupling agent and organic solvent are mixed according to the proportion of 1: preparing a solution by the mass ratio of 20, adding zirconium oxide into the solution, stirring and reacting for 40-100 min, then oscillating for 20-40 min by ultrasonic waves, filtering, washing and drying to obtain the surface modified zirconium oxide.
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