CN107188543A - Cr2O3/ ZTA composite granules and ceramics and preparation method thereof - Google Patents
Cr2O3/ ZTA composite granules and ceramics and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to Cr2O3/ ZTA composite granules and ceramics and preparation method thereof, comprise the following steps：By alumina powder, Zirconium powder and Cr (NO3)3.9H2O mixing and ball milling, obtain mixed slurry, and the mass fraction of wherein alumina powder accounts for the 80~85% of zirconium oxide and aluminum oxide gross mass, and remaining 15%~20% is Zirconium powder, Cr (NO3)3.9H2O addition is with Cr2O3It is 0~0.8% that conversion, which accounts for zirconium oxide and aluminum oxide gross mass,；In 400~600 DEG C of calcinings after gained mixed slurry is dried, Cr is obtained2O3/ Zirconia reinforced alumina composite granule.By with presoma Cr (NO3)3.9H2O mode introduces Cr2O3Additive, can make Cr2O3More uniformly it is distributed in ZTA powders.
Description
Technical field
The present invention relates to a kind of high rigidity, the preparation method of the inorganic material of high tenacity, more particularly to one kind is with presoma
Cr(NO3)3.9H2O mode introduces Cr2O3And chromium oxide even dispersion is distributed in preparation method in ZTA ceramics.
Background technology
Zirconia reinforced alumina ceramic (ZTA) refers to that using aluminum oxide as primary raw material partially stabilized zirconium oxide is increasing
By force, a kind of new composite of toughness reinforcing phase.Aluminum oxide constitutes a system with zirconium oxide, by means of the phase of zirconia ceramics
Become toughness reinforcing, and aluminum oxide formation compound phase gives full play to the high rigidity of aluminum oxide and zirconia ceramics, corrosion-resistant, high temperature resistant simultaneously
Improve its fragility, with excellent mechanical property.In view of ZTA ceramics have high rigidity, corrosion-resistant, cheap etc.
Advantage, is widely used in high temperature, machinery and electronic applications.With the raising of industrial level, conventional ZTA potteries
Porcelain part can not meet the demand of the technical fields such as Aero-Space, communications and transportation.Therefore high intensity, high tenacity and high rigidity are prepared
ZTA ceramics be particularly important.
The method of the high tenacity ZTA ceramics prepared at present has many kinds, mainly by optimizing powder preparation technology, reduces powder
The average grain size of body, so as to improve its toughness and hardness；Or strengthen it by introducing second mutually in ZTA powders
Toughness.At present, Japanese TOSOH companies have prepared toughness and the good ZTA powders of wearability and ceramics, through dividing
Analysis, this powder is Cr2O3With ZTA mixed powder.Therefore it is close with TOSOH companies powders in order to prepare
Cr2O3/ ZTA powders are simultaneously market-oriented by this powder, so as to break external powder monopolization technology, this will be an important research class
Topic and direction.
The content of the invention
The problem of existing for prior art, it is an object of the invention to provide the Cr of function admirable2O3/ ZTA materials and its
Preparation method.
On the one hand, the present invention provides a kind of Cr2O3/ Zirconia reinforced alumina composite granule (Cr2O3/ ZTA powders) system
Preparation Method, comprises the following steps：
A) by alumina powder, Zirconium powder and Cr (NO3)3.9H2O, which is added in ball grinder, carries out ball milling, obtains mixing slurry
Material, the mass fraction of wherein alumina powder accounts for the 80~85% of zirconium oxide and aluminum oxide gross mass, remaining 15~20% and is
Zirconium powder, Cr (NO3)3.9H2O addition is with Cr2O3It is 0~0.8% that conversion, which accounts for zirconium oxide and aluminum oxide gross mass,；
B) in 400~600 DEG C of calcinings after gained mixed slurry is dried, Cr is obtained2O3/ Zirconia reinforced alumina composite granule.
The present invention is on the basis of the preparation of existing ZTA powders, by with presoma Cr (NO3)3.9H2O mode is introduced
Cr2O3Additive, can make Cr2O3More uniformly it is distributed in ZTA powders, and obtained Cr2O3Grain diameter is more
Small, it is easier to be solidly soluted into zirconium oxide and aluminum oxide.So as to prepare the Cr of function admirable2O3/ Zirconia reinforced alumina is multiple
Close powder.The preparation method of the present invention has the advantages that safe, time saving, energy-conservation, is a kind of very promising new method.
Preferably, Cr (NO3)3.9H2O addition is with Cr2O3Conversion account for zirconium oxide and aluminum oxide gross mass be 0.08~
0.8%.
It is preferred that in step a), the Zirconium powder is the zirconium oxide of 2~4mol% stabilized with yttrium oxide, preferably 3
Zirconium oxide (the 3Y-ZrO of mol% stabilized with yttrium oxide2, 3mol%Y2O3-ZrO2)。
It is preferred that in step a), adding zirconia ball and absolute ethyl alcohol being used as ball-milling medium, wherein zirconia ball gross mass
2~3 times of powder gross mass, the addition of absolute ethyl alcohol is 1.0~1.3 times of powder gross mass, Ball-milling Time be 20~
24 hours.
It is preferred that in step a), the drying is dried 8~12 hours at a temperature of 70~85 DEG C.
It is preferred that in step b), the time of the calcining is 1~2 hour.
On the other hand, the present invention provides a kind of Cr2O3The preparation method of/Zirconia reinforced alumina composite ceramics, including it is following
Step：
(1) Cr is prepared using any one above-mentioned preparation method2O3/ Zirconia reinforced alumina composite granule；
(2) by gained Cr2O3Sintered after the shaping of/Zirconia reinforced alumina composite granule at 1500~1580 DEG C, obtain Cr2O3/
Zirconia reinforced alumina composite ceramics.
The present invention is by with presoma Cr (NO3)3.9H2O mode introduces Cr2O3Additive, prepares function admirable
Cr2O3/ ZTA powders, and the preparation Cr by raw material of the powder2O3/ Zirconia reinforced alumina composite ceramics.Obtained
Cr2O3/ Zirconia reinforced alumina composite ceramics has high intensity, high tenacity and high rigidity, and acid-alkali-corrosive-resisting.
It is preferred that in step (2), it is described to be shaped to isostatic pressing.
Another further aspect, the present invention is provided by any one above-mentioned Cr2O3/ Zirconia reinforced alumina composite granule
(Cr2O3/ ZTA powders) preparation method prepare Cr2O3/ Zirconia reinforced alumina composite granule, it includes zirconium oxide increasing
Tough alumina substrate and even dispersion are distributed in the chrome oxide particle in the Zirconia reinforced alumina matrix, and wherein chromium oxide is accounted for
The 0~0.8% of Zirconia reinforced alumina gross mass.
Another aspect, the present invention is provided by any one above-mentioned Cr2O3The preparation method of/Zirconia reinforced alumina composite ceramics
The Cr of preparation2O3/ Zirconia reinforced alumina composite ceramics, it includes Zirconia reinforced alumina matrix and even dispersion is distributed in
Chrome oxide particle in the Zirconia reinforced alumina matrix, wherein chromium oxide account for Zirconia reinforced alumina gross mass 0~
0.8%, the hardness of the composite ceramics is in more than 1760Mpa, and toughness is in 4.3MPa.m1/2More than.
Brief description of the drawings
Fig. 1 is with presoma Cr (NO3)3.9H2O mode introduces Cr2O3As the powder of additive in 1540 DEG C of sintering
ZTA ceramics SEM figure, wherein (a) 0.08wt.%Cr2O3；(b) 0.2wt.%Cr2O3；(c) 0.5wt.%Cr2O3；(d)
0.8wt.%Cr2O3；
Fig. 2 is with presoma Cr (NO3)3.9H2O mode introduces Cr2O3As the powder of additive in 1540 DEG C of ZTA sintered
The XRD of ceramics, wherein (A) 0wt.%Cr2O3；(B) 0.08wt.%Cr2O3；(C) 0.2wt.%Cr2O3；(D)0.5
Wt.%Cr2O3；(E) 0.8wt.%Cr2O3。
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing and following embodiments, it should be appreciated that accompanying drawing and following embodiments are only
For illustrating the present invention, it is not intended to limit the present invention.
The present invention introduces Cr in ZTA powders2O3Additive, obtains Cr2O3/ ZTA composite granules, wherein Cr2O3Add
Plus agent is with Cr (NO3)3.9H2O mode is introduced.Hereinafter, as an example, illustrating Cr2O3The preparation of/ZTA composite granules
Method.
As raw material, alumina powder, Zirconium powder and Cr (NO can select3)3.9H2O.Wherein, alumina powder
Purity be preferably more than 99.0%.The particle diameter of alumina powder can be 0.3~0.6 μm.Zirconium powder is preferably that yittrium oxide is steady
Fixed zirconium oxide, the zirconium oxide of the zirconium oxide, more preferably 3mol% stabilized with yttrium oxide of such as 2~4mol% stabilized with yttrium oxide
(3mol%Y2O3-ZrO2).The purity of Zirconium powder is preferably more than 99.0%.Its particle diameter can be 0.1~0.4 μm.
Cr(NO3)3.9H2O purity is preferably more than 99.0%.
On the proportioning of each raw material, the mass fraction of alumina powder accounts for the 80%~85% of zirconium oxide and aluminum oxide gross mass,
Remaining 15~20% be Zirconium powder, and when the mass fraction of zirconium oxide is less than 15%, the toughness of ZTA ceramics is very poor,
When the mass fraction of zirconium oxide is higher than 20%, ZTA hardness is significantly reduced, and cost increases, and considers, zirconium oxide
Addition 15%~20%..Cr(NO3)3.9H2O addition is with Cr2O3Conversion accounts for zirconium oxide and aluminum oxide gross mass is
0~0.8%, preferably 0.08~0.8%, more preferably 0.2~0.5%.If Cr2O3Mass fraction be more than 0.8%, meeting
Toughness and hardness is caused all to decline.
Each raw material is mixed and ball milling is carried out.In one example, according to ZTA powders are prepared the step of, aluminum oxide is weighed
Powder and 3Y-ZrO2The mass fraction of powder, wherein alumina powder accounts for the 75%~80% of zirconium oxide and aluminum oxide gross mass,
Remaining 15%~20% is 3Y-ZrO2(3mol%Y2O3-ZrO2).This 2 kinds of powders are poured into the ball grinder of polytetrafluoroethylene (PTFE)
In, then weigh the Cr that mass fraction accounts for zirconium oxide and aluminum oxide gross mass is 0~0.8%2O3(wherein Cr2O3With presoma
Cr(NO3)3.9H2O form addition) it is added in ball grinder.
Ball milling method is preferably wet ball grinding.Ball-milling medium may include zirconia ball and absolute ethyl alcohol.Wherein zirconia ball is total
Quality can be 2~3 times of powder gross mass.The addition of absolute ethyl alcohol can be 1.0~1.3 times of powder quality.By original
The mixture of material obtains mixed slurry in planetary mills after 20~24h of ball milling standby, when Ball-milling Time is in more than 20h, oxidation
Zirconium can be uniformly dispersed in aluminum oxide, but when Ball-milling Time is more than 24h, the time to ZTA powders dispersion effect
It is not apparent.
Mixed slurry is dried, mixed powder is obtained.In one example, this mixed slurry is poured into plastic containers
In, and put 8~12h of baking at a temperature of 70~85 DEG C in an oven.Then, by the mixed powder of drying 400~
600 DEG C of calcinings, obtain Cr2O3/ ZTA composite granules.In one example, the mixed powder of drying is poured into oxidation
In zirconium crucible, furnace cooling after 1~2h is incubated in 400~600 DEG C of electric furnace, Cr is obtained2O3/ ZTA composite granules.
Resulting Cr2O3/ ZTA composite granules include Zirconia reinforced alumina matrix and even dispersion is distributed in the oxygen
Change the chrome oxide particle in zirconium toughened aluminum oxide matrix.Wherein, the mass fraction of aluminum oxide is in Zirconia reinforced alumina matrix
75%~80%, the mass fraction of zirconium oxide is 15%~20%.Chromium oxide account for Zirconia reinforced alumina gross mass 0~
0.8%, preferably 0.08~0.8%, more preferably 0.2~0.5%.The particle diameter of chrome oxide particle is 0.01~0.02 μm.
The Cr that the present invention is obtained2O3/ ZTA powder dispersities can be good, is made pottery available for the high performance structures for preparing acid-alkali-corrosive-resisting
Porcelain part, while also providing reference basis for the addition manner of remaining ceramic powder kind oxide, its preparation method has peace
Entirely, it is time saving, energy-conservation the advantages of, be a very promising new method.
For example, can be by resulting Cr2O3Cr is made in the shaping of/ZTA composite granules, sintering2O3/ ZTA composite ceramicses.
On the method for shaping, including but not limited to isostatic pressing, dry-pressing formed, injection moulding, gel injection-moulding into
Any one in type, Direct Coagulation Casting, injection forming etc., preferably isostatic pressing, reason is isostatic pressing
Method is simple, and consistency is high, and can be with the complicated ceramic structures of isostatic pressed.
The temperature of sintering can be 1500~1580 DEG C.Sintering time can be 1.5~2.5 hours.After sintering, it can obtain pink
Color ZTA ceramics.
Cr produced by the present invention2O3/ ZTA composite ceramicses include Zirconia reinforced alumina matrix and even dispersion is distributed in institute
State the chrome oxide particle in Zirconia reinforced alumina matrix.Wherein, the quality of aluminum oxide is divided in Zirconia reinforced alumina matrix
Number is 80%~85%, and the mass fraction of zirconium oxide is 15%~20%.Chromium oxide accounts for Zirconia reinforced alumina gross mass
0~0.8%, preferably 0.08~0.8%, more preferably 0.2~0.5%.The particle diameter of chrome oxide particle is 0.01~0.02 μm.
The Cr of the present invention2O3Containing in/ZTA composite ceramicses strengthens its toughness as the chrome oxide particle of the second phase, and
Chromium oxide is with Cr (NO3)3.9H2O form is introduced, so as to so that additive is easier to be solidly soluted into ZTA, and point
Dissipate uniform, therefore the toughness and hardness of the present invention are high, hardness is in more than 1780Mpa, and toughness is in 4.5MPa.m1/2More than.And
And, Cr of the invention2O3/ ZTA composite ceramicses have excellent acid-alkali-corrosive-resisting performance.
Embodiment is enumerated further below to describe the present invention in detail.It will similarly be understood that following examples are served only for this hair
It is bright to be further described, it is impossible to be interpreted as limiting the scope of the invention, those skilled in the art is according to the present invention's
Some nonessential modifications and adaptations that the above is made belong to protection scope of the present invention.Following specific technique ginsengs of example
Number etc. is also only an example in OK range, i.e. those skilled in the art can be done in suitable scope by this paper explanation
Selection, and do not really want to be defined in the concrete numerical value of hereafter example.
In the present invention, the method for testing of each performance of material is as follows：Hardness and fracture toughness are all to use indentation method；Instrument：
Microhardness instrument (AVK-A, AKASHI, Jpn), load：98N；Load time：20min；Sample surfaces characteristic：Throw
Light is to minute surface.Bending strength is tested with universal testing machine, instrument：(INSTRON-5992).
Comparative example 1
A) according to ZTA powders are prepared the step of, alumina powder and 3Y-ZrO are weighed2(3mol%Y2O3-ZrO2) powder, wherein oxygen
Change aluminium powder body 85g, 3mol%Y2O3-ZrO2Powder 15g, and this 2 kinds of powders are poured into the ball grinder of polytetrafluoroethylene (PTFE)；
B) 280g zirconia balls are added in the ball grinder of polytetrafluoroethylene (PTFE) as ball-milling medium, 120g absolute ethyl alcohols is added and is used as ball
Grinding media.This mixture is obtained in planetary mills after ball milling 24h be mixed to get slurry standby；
C) this mixed slurry is poured into plastic containers, and puts and dry 12h at a temperature of 85 DEG C in an oven, then will dried
Dry mixed powder is poured into oxidation zirconium crucible, and furnace cooling after 1~2h is incubated in 500 DEG C of electric furnace, ZTA powder is obtained
Body；
D) this mixed powder by isostatic pressing, is being sintered into ZTA ceramics at 1540 DEG C.
Shown in XRD such as Fig. 2 of obtained ZTA ceramics (A).After testing, the fracture toughness of ZTA ceramics exists
3.25MPa.m1/2, hardness is 1560MPa.
Comparative example 2
A) according to ZTA powders are prepared the step of, alumina powder and 3Y-ZrO are weighed2Powder, wherein alumina powder 85g,
3mol%Y2O3-ZrO2Powder 15g, Cr2O3Powder 0.5g, and this 3 kinds of powders are poured into the ball grinder of polytetrafluoroethylene (PTFE)
In；
B) 280g zirconia balls are added in the ball grinder of polytetrafluoroethylene (PTFE) as ball-milling medium, are added without 120g absolute ethyl alcohol conducts
Ball-milling medium.This mixture is obtained in planetary mills after ball milling 24h be mixed to get slurry standby；
C) this mixed slurry is poured into plastic containers, and puts and dry 12h at a temperature of 85 DEG C in an oven, then will dried
Dry mixed powder is poured into oxidation zirconium crucible, and furnace cooling after 1~2h is incubated in 500 DEG C of electric furnace, is obtained
Cr2O3/ ZTA composite granules；
D) this mixed powder by isostatic pressing, is being sintered into pink ZTA ceramics at 1540 DEG C.
After testing, the fracture toughness of ZTA ceramics ZTA ceramics is 3.42MPa.m1/2, hardness is 1726MPa.
Embodiment 1
A) according to ZTA powders are prepared the step of, alumina powder and 3Y-ZrO are weighed2Powder, wherein alumina powder 85g,
3Y-ZrO2Powder 15g, Cr (NO3)3.9H2O crystalline solid 6.84g, wherein 6.84gCr (NO3)3.9H2Cr in O3+Molar concentration
With 0.5g Cr2O3In Cr3+Molar concentration it is equal, and this 3 kinds of powders are poured into the ball grinder of polytetrafluoroethylene (PTFE)；
B) 280g zirconia balls are added in the ball grinder of polytetrafluoroethylene (PTFE) as ball-milling medium, are added without 120g absolute ethyl alcohol conducts
Ball-milling medium.This mixture is obtained in planetary mills after ball milling 24h be mixed to get slurry standby；
C) this mixed slurry is poured into plastic containers, and puts and dry 12h at a temperature of 85 DEG C in an oven, then will dried
Dry mixed powder is poured into oxidation zirconium crucible, and furnace cooling after 1~2h is incubated in 500 DEG C of electric furnace, is obtained
Cr2O3/ ZTA composite granules；
D) this mixed powder by isostatic pressing, is being sintered into pink ZTA ceramics at 1540 DEG C.
The SEM figures of obtained ZTA ceramics are as shown in Fig. 1 (c), it can be seen that zirconium oxide is uniformly dispersed in aluminum oxide
In, almost do not have leachy presence.Shown in XRD such as Fig. 2 of obtained ZTA ceramics (D), it can be seen that be pure
The zirconium oxide of Tetragonal and the aluminum oxide of hexagonal phase.After testing, the ZTA ceramic hardness is 1805MPa, and toughness is
4.76MPa.m1/2。
Embodiment 2
A) according to ZTA powders are prepared the step of, alumina powder and 3Y-ZrO are weighed2Powder, wherein alumina powder 80g,
3mol%Y2O3-ZrO2Powder 20g, Cr (NO3)3.9H2O crystalline solid 10.94g, wherein 10.94gCr (NO3)3.9H2In O
Cr3+Molar concentration and 0.8g Cr2O3In Cr3+Molar concentration it is equal, and this 3 kinds of powders are poured into polytetrafluoroethylene (PTFE)
Ball grinder in；
B) 280g zirconia balls are added in the ball grinder of polytetrafluoroethylene (PTFE) as ball-milling medium, are added without 120g absolute ethyl alcohol conducts
Ball-milling medium.This mixture is obtained in planetary mills after ball milling 24h be mixed to get slurry standby；
C) this mixed slurry is poured into plastic containers, and puts and dry 12h at a temperature of 85 DEG C in an oven, then will dried
Dry mixed powder is poured into oxidation zirconium crucible, and furnace cooling after 1~2h is incubated in 500 DEG C of electric furnace, is obtained
Cr2O3/ ZTA composite granules；
D) this mixed powder by isostatic pressing, is being sintered into pink ZTA ceramics at 1540 DEG C.
The SEM figures of obtained ZTA ceramics are as shown in Fig. 1 (d), it can be seen that zirconium oxide is uniformly dispersed in aluminum oxide
In, almost do not have leachy presence.White particle in Fig. 1 is zirconium oxide, and dark particle is aluminum oxide, and chromium oxide is solid
It is molten into aluminum oxide and zirconium oxide, XRD such as Fig. 2 of obtained ZTA ceramics (E) is shown, it can be seen that be pure four
The zirconium oxide of square phase and the aluminum oxide of hexagonal phase, no Cr2O3Presence (Cr2O3It has been solidly soluted into zirconium oxide and aluminum oxide
Go).After testing, the ZTA ceramic hardness is 1790MPa, and toughness is 4.44MPa.m1/2。
Embodiment 3
Basic be the same as Example 1, differs only in Cr2O3Content is 0.08wt.%.
The SEM figures of obtained ZTA ceramics are as shown in Fig. 1 (a), it can be seen that zirconium oxide is uniformly dispersed in aluminum oxide
In, almost do not have leachy presence.Shown in XRD such as Fig. 2 of obtained ZTA ceramics (B), it can be seen that be pure
The zirconium oxide of Tetragonal and the aluminum oxide of hexagonal phase, no Cr2O3Presence.After testing, the ZTA ceramic hardness is
1772MPa, toughness is 4.52MPa.m1/2。
Embodiment 4
Basic be the same as Example 1, differs only in Cr2O3Content is 0.2wt.%.
The SEM figures of obtained ZTA ceramics are as shown in Fig. 1 (b), it can be seen that zirconium oxide is uniformly dispersed in aluminum oxide
In, almost do not have leachy presence.Shown in XRD such as Fig. 2 of obtained ZTA ceramics (C), it can be seen that be pure
The zirconium oxide of Tetragonal and the aluminum oxide of hexagonal phase, no Cr2O3Presence.After testing, ZTA ceramics ZTA ceramics are hard
Spend for 1770MPa, toughness is 4.35MPa.m1/2。
Cr produced by the present invention2O3/ Zirconia reinforced alumina composite ceramics, compared to without Cr2O3Zirconium oxide plasticizing oxygen
Change aluminium ceramics, hardness adds 13%, and toughness adds 32%, compared to directly to add Cr2O3Form introduce Cr2O3
Obtained composite ceramics, hardness adds 2%, and toughness adds 26%.
Industrial applicability：
The composite ceramics of the present invention has high intensity, high tenacity and high rigidity, can be applied to the technologies such as Aero-Space, communications and transportation neck
Domain.
Claims (10)
1. a kind of Cr2O3The preparation method of/Zirconia reinforced alumina composite granule, it is characterised in that comprise the following steps：
a）By alumina powder, Zirconium powder and Cr (NO3)3.9H2O mixing and ball milling, obtain mixed slurry, and the mass fraction of wherein alumina powder accounts for the 80~85% of zirconium oxide and aluminum oxide gross mass, and remaining 15%~20% is Zirconium powder, Cr (NO3)3.9H2O addition is with Cr2O3It is 0~0.8% that conversion, which accounts for zirconium oxide and aluminum oxide gross mass,；
b）In 400~600 DEG C of calcinings after gained mixed slurry is dried, Cr is obtained2O3/ Zirconia reinforced alumina composite granule.
2. preparation method according to claim 1, it is characterised in that Cr (NO3)3.9H2O addition is with Cr2O3It is 0.08~0.8% that conversion, which accounts for zirconium oxide and aluminum oxide gross mass,.
3. preparation method according to claim 1 or 2, it is characterised in that step a）In, the Zirconium powder is the zirconium oxide of the zirconium oxide of 2~4 mol% stabilized with yttrium oxide, preferably 3 mol% stabilized with yttrium oxide.
4. preparation method according to any one of claim 1 to 3, it is characterised in that step a）In, zirconia ball and absolute ethyl alcohol are added as ball-milling medium, and wherein zirconia ball gross mass is 2~3 times of powder gross mass, and the addition of absolute ethyl alcohol is 1.0~1.3 times of powder gross mass, and Ball-milling Time is 20~24 hours.
5. preparation method according to any one of claim 1 to 4, it is characterised in that step a）In, the drying is dried 8~12 hours at a temperature of 70~85 DEG C.
6. preparation method according to any one of claim 1 to 5, it is characterised in that step b）In, the time of the calcining is 1~2 hour.
7. a kind of Cr2O3The preparation method of/Zirconia reinforced alumina composite ceramics, it is characterised in that comprise the following steps：
（1）Cr is prepared using the preparation method any one of claim 1 to 62O3/ Zirconia reinforced alumina composite granule；
（2）By gained Cr2O3Sintered after the shaping of/Zirconia reinforced alumina composite granule at 1500~1580 DEG C, obtain Cr2O3/ Zirconia reinforced alumina composite ceramics.
8. preparation method according to claim 7, it is characterised in that step（2）In, it is described to be shaped to isostatic pressing.
9. a kind of preparation method as any one of claim 1 to 6 prepares Cr2O3/ Zirconia reinforced alumina composite granule, it is characterised in that be distributed in the chrome oxide particle in the Zirconia reinforced alumina matrix including Zirconia reinforced alumina matrix and even dispersion, wherein chromium oxide accounts for the 0~0.8% of Zirconia reinforced alumina gross mass.
10. Cr prepared by a kind of preparation method as described in claim 7 or 82O3/ Zirconia reinforced alumina composite ceramics, it is characterized in that, the chrome oxide particle in the Zirconia reinforced alumina matrix is distributed in including Zirconia reinforced alumina matrix and even dispersion, wherein chromium oxide accounts for the 0~0.8% of Zirconia reinforced alumina gross mass, the hardness of the composite ceramics is in 1760 more than Mpa, and toughness is in 4.3MPa.m1/2More than.
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