CN115974569A - Colored zirconia ceramic and preparation method thereof - Google Patents
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- CN115974569A CN115974569A CN202211662056.4A CN202211662056A CN115974569A CN 115974569 A CN115974569 A CN 115974569A CN 202211662056 A CN202211662056 A CN 202211662056A CN 115974569 A CN115974569 A CN 115974569A
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- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 title claims abstract description 232
- 239000000919 ceramic Substances 0.000 title claims abstract description 109
- 238000002360 preparation method Methods 0.000 title abstract description 18
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000000843 powder Substances 0.000 claims abstract description 39
- 238000000227 grinding Methods 0.000 claims abstract description 31
- 238000004040 coloring Methods 0.000 claims abstract description 22
- 239000002131 composite material Substances 0.000 claims abstract description 18
- 238000005245 sintering Methods 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 239000002344 surface layer Substances 0.000 claims abstract description 16
- 238000000498 ball milling Methods 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 8
- 229910000428 cobalt oxide Inorganic materials 0.000 claims abstract description 5
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 claims abstract description 5
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910000423 chromium oxide Inorganic materials 0.000 claims abstract description 4
- 238000005498 polishing Methods 0.000 claims abstract description 3
- 239000010432 diamond Substances 0.000 claims description 16
- 229910003460 diamond Inorganic materials 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 15
- 239000003086 colorant Substances 0.000 claims description 14
- 239000010410 layer Substances 0.000 claims description 12
- 239000006104 solid solution Substances 0.000 claims description 10
- 238000004321 preservation Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 239000011651 chromium Substances 0.000 claims description 3
- 229910017052 cobalt Inorganic materials 0.000 claims description 3
- 239000010941 cobalt Substances 0.000 claims description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 3
- 239000010431 corundum Substances 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 238000010345 tape casting Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 239000000243 solution Substances 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 abstract description 8
- 238000003746 solid phase reaction Methods 0.000 abstract description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 abstract 2
- 229910001928 zirconium oxide Inorganic materials 0.000 abstract 2
- 150000001875 compounds Chemical class 0.000 abstract 1
- 239000011224 oxide ceramic Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 32
- 238000000465 moulding Methods 0.000 description 13
- 238000010438 heat treatment Methods 0.000 description 10
- 239000002245 particle Substances 0.000 description 10
- 238000005452 bending Methods 0.000 description 7
- 238000001816 cooling Methods 0.000 description 7
- LBFUKZWYPLNNJC-UHFFFAOYSA-N cobalt(ii,iii) oxide Chemical compound [Co]=O.O=[Co]O[Co]=O LBFUKZWYPLNNJC-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000012071 phase Substances 0.000 description 5
- 229910019114 CoAl2O4 Inorganic materials 0.000 description 3
- QDOXWKRWXJOMAK-UHFFFAOYSA-N chromium(III) oxide Inorganic materials O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 3
- 238000005056 compaction Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- HMUNWXXNJPVALC-UHFFFAOYSA-N 1-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C(CN1CC2=C(CC1)NN=N2)=O HMUNWXXNJPVALC-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
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- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
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- 230000000717 retained effect Effects 0.000 description 2
- 229910002515 CoAl Inorganic materials 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
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- 150000002500 ions Chemical class 0.000 description 1
- 239000010977 jade Substances 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 235000012431 wafers Nutrition 0.000 description 1
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- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention discloses a colored zirconia ceramic and a preparation method thereof, wherein the preparation method comprises the following steps: s1, mixing nano alumina powder and zirconia powder according to a mass ratio of 5:95 ball-milling and mixing, and drying to obtain uniformly dispersed composite ceramic powder; s2, forming and sintering the composite ceramic powder to obtain nano-alumina reinforced white zirconia ceramic; s3, mechanically polishing the nano-alumina reinforced white zirconia ceramic; s4, embedding the polished nano-alumina reinforced white zirconia ceramic into cobalt oxide or chromium oxide powder and compacting to obtain colored zirconia ceramic with a colored surface layer; and S5, mechanically and finely grinding the colored zirconia ceramics. According to the invention, the zirconium oxide matrix is toughened by using the nano-alumina, and a coloring compound is generated on the surface layer of the matrix through a solid-phase reaction of a coloring oxide and the nano-alumina to generate color, so that the high-toughness colored zirconium oxide ceramic with a high-toughness core part and a pure surface color is obtained.
Description
Technical Field
The invention relates to the field of manufacturing of colored zirconia ceramics, in particular to a colored zirconia ceramic and a preparation method thereof.
Background
The zirconia ceramics has wide application in the fields of mobile phone back covers, watch shells, watchbands, jewelry accessories and other appearance parts due to the mechanical properties of high toughness and high strength and the feeling of being moist like jade. Because of the requirement of the appearance piece for various gorgeous colors, the method for sintering zirconia ceramic powder after being doped with a small amount of oxide colorant to present color effect is the mainstream preparation method of the color zirconia ceramic at present. However, after most of the colored zirconia is colored, the mechanical properties, especially the fracture toughness, of the colored zirconia are obviously reduced, which can remarkably deteriorate the anti-falling performance of appearance parts such as mobile phone back covers. The main reason is that the reduction of the mechanical properties of the conventional colored zirconia is mainly caused by the fact that the stress distribution generated in the process of the deformation of the zirconia matrix under stress is concentrated near the second phase particles generated by the colorant, and the second phase generated by the ions of the conventional colorant is mostly a 'hard and brittle' phase, so that cracks are most likely to be initiated and expanded in the second phase under the stress concentration condition, and the mechanical properties are further reduced. According to Griffith theory, the increase in fracture strength of brittle materials is achieved primarily by increasing the fracture toughness or reducing the critical crack size. At present, two main methods for improving fracture toughness of zirconia ceramics are available: firstly, energy dispersion elements are added into a ceramic microstructure to improve the fracture toughness of the ceramic microstructure, and the elements such as fibers, whiskers or wafers, particles and the like; secondly, a metal component is added into the ceramic matrix to form a crack connecting element so as to absorb energy during plastic deformation and prevent crack propagation. The method for adding the whiskers or the fibers has the main technical difficulties that the whiskers or the fibers are extremely easy to agglomerate and are difficult to disperse uniformly, so that the sample consistency is poor, the whiskers are easy to break by a mechanical ball milling method, and the effect of toughening the whiskers is reduced.
Disclosure of Invention
The invention aims to provide a colored zirconia ceramic and a preparation method thereof, aiming at solving the problems of reduced mechanical property of a zirconia matrix caused by integral doping of coloring elements and the problems of whisker toughening and metal phase toughening.
The technical scheme of the invention is as follows:
the color zirconia ceramic consists of a surface layer and a core part, wherein the surface layer is a coloring layer, and the core part is nano-alumina reinforced zirconia ceramic.
Furthermore, the thickness of the coloring layer is 100-250 um, and can be controlled by controlling the heat preservation temperature and time.
Furthermore, the coloring mechanism of the coloring layer is nanometer alumina and a colorant C r2 O 3 The chromium corundum is generated through the solid solution reaction to present pink color.
Furthermore, the coloring mechanism of the coloring layer is nano aluminum oxide and a coloring agent Co 2 O 3 The solid solution reaction generates cobalt blue to appear blue.
The preparation method of the colored zirconia ceramic comprises the following steps:
s1, mixing nano alumina powder and zirconia powder according to a mass ratio of 5:95 ball-milling and mixing, and drying to obtain uniformly dispersed composite ceramic powder;
s2, forming and sintering the composite ceramic powder to obtain nano-alumina reinforced white zirconia ceramic;
s3, mechanically polishing the nano-alumina reinforced white zirconia ceramics;
s4, embedding the polished nano-alumina enhanced white zirconia ceramics into cobalt oxide or chromium oxide powder and compacting to obtain colored zirconia ceramics with colored surface layers;
and S5, mechanically and finely grinding the colored zirconia ceramics.
In the step S1, the nano alumina powder is high-purity nano-grade a-alumina powder, and the sintering density of 99 percent can be realized at the temperature of more than 1400 ℃.
In the step S2, the forming method of the composite ceramic powder comprises dry pressing forming, injection forming and tape casting forming, wherein the sintering temperature is 1600 ℃, and the heat preservation time is 3 hours.
In step S3, the nano alumina-reinforced white zirconia ceramic is mechanically ground using a 120-mesh diamond grinding wheel.
In the step S4, the compaction pressure is 1Mpa, the coloring temperature is 1300 ℃, and the heat preservation time is 5 hours.
In step S5, the colored zirconia ceramics are mechanically ground using a 400-mesh diamond fine grinding wheel.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, firstly, the nano alumina particles are utilized to realize the toughening of the zirconia matrix, then the cobalt oxide powder is utilized to carry out low-temperature burial firing on the toughened zirconia, and the cobalt oxide and the alumina on the surface layer of the toughened zirconia generate a blue CoAl2O4 solid solution through a solid-phase reaction in the heat preservation process, so that the characteristics of color generation and internal toughness of the surface layer of the zirconia ceramic are realized, the fracture toughness and the bending strength of the colored zirconia ceramic are obviously improved, and the preparation process is simple.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The color zirconia ceramic provided by the invention consists of a surface layer and a core part, wherein the surface layer is a coloring layer, and the core part is nano-alumina reinforced zirconia ceramic with excellent mechanical properties (toughness).
Wherein, the thickness of dyed layer is 100 ~ 250um, and accessible control heat preservation temperature and time are controlled to obtain the colored zirconia ceramics of different dyed layer thicknesses.
Optionally, the coloring mechanism of the coloring layer is nano aluminum oxide and a colorant C r2 O 3 The solid solution reaction generates chromium corundum (alpha-Al 2O3-Cr2O3 solid solution) to present pink color.
Optionally, the coloring mechanism of the colored layer is nano aluminum oxide and a colorant Co 2 O 3 The solid solution reaction generates cobalt blue (CoAl 2O4 solid solution) to appear blue.
The preparation method of the colored zirconia ceramic comprises the following steps:
s1, mixing nano alumina powder (high-purity nano-scale a-alumina powder, and the sintering density of 99% can be realized at the temperature of more than 1400 ℃) with zirconia powder according to the mass ratio of 5:95 ball-milling and mixing, and drying to obtain uniformly dispersed composite ceramic powder;
s2, molding (dry pressing molding/injection molding/tape casting molding) the composite ceramic powder, and sintering at 1600 ℃ for 3h to obtain nano-alumina reinforced white zirconia ceramic;
s3, mechanically grinding the nano-alumina enhanced white zirconia ceramic by using a 120-mesh diamond grinding wheel;
s4, embedding the polished nano-alumina reinforced white zirconia ceramic into cobalt oxide or chromium oxide powder, compacting (the pressure is 1 Mpa), and preserving the heat at 1300 ℃ for 5 hours to obtain the colored zirconia ceramic with a colored surface layer;
and S5, mechanically and finely grinding the colored zirconia ceramics by using a 400-mesh diamond fine grinding wheel.
The preparation method is realized by firstly utilizing high-purity nano alumina particles and zirconia ceramicsGood microcosmic combination, thereby obtaining a tough nano alumina reinforced zirconia ceramic core, and then realizing the color generation of zirconia and simultaneously keeping the tough core of the zirconia ceramic by means of surface layer coloring, compared with the color zirconia ceramic prepared by the traditional method, the color-developing nano alumina reinforced zirconia ceramic core has the structure of more than 10 MPa.m 1/2 The fracture toughness and the bending strength of 1000MPa are better; the preparation method has the advantages of simple and convenient flow, low cost of used raw materials, high production efficiency, wide application range, large-area preparation and the like, and can be applied to industrial large-scale production.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Example 1
The embodiment provides a preparation method of colored zirconia ceramics, which comprises the following steps:
s1, ball-milling and mixing the nano-alumina and the zirconia powder according to a mass ratio of 5:1, ball milling at a rotating speed of 300r/min for 6 hours, and drying to obtain uniformly dispersed composite ceramic powder;
s2, granulating the composite ceramic powder, and performing dry pressing molding, wherein the molding pressure is 150Mpa, finally heating to 1200 ℃ at the speed of 5 ℃/min, keeping the temperature for 1h, then heating to 1600 ℃ at the speed of 2 ℃/min, keeping the temperature for 3h, cooling to room temperature along with a furnace, and sintering to obtain the nano-alumina reinforced white zirconia ceramic;
s3, performing coarse grinding on the nano-alumina enhanced white zirconia ceramic by using a 120-mesh diamond grinding wheel until the surface is smooth;
s4, putting the polished nano-alumina enhanced white zirconia ceramics into a cobalt oxide powder body for compaction, and preserving heat at 1300 ℃ for 5 hours to obtain blue zirconia ceramics with a colored surface layer;
and S5, mechanically and finely grinding the colored zirconia ceramics by using a 400-mesh diamond fine grinding wheel.
Example 2
The embodiment provides a preparation method of colored zirconia ceramics, which comprises the following steps:
s1, ball-milling and mixing nano alumina and zirconia powder according to a mass ratio of 5:1, ball milling at a rotating speed of 300r/min for 6 hours, and drying to obtain uniformly dispersed composite ceramic powder;
s2, granulating the composite ceramic powder, and carrying out dry pressing molding, wherein the molding pressure is 150Mpa, finally heating to 1200 ℃ at the speed of 5 ℃/min, keeping the temperature for 1h, then heating to 1600 ℃ at the speed of 2 ℃/min, keeping the temperature for 3h, cooling to room temperature along with a furnace, and sintering to obtain the nano-alumina reinforced white zirconia ceramic;
s3, performing coarse grinding on the nano-alumina enhanced white zirconia ceramic by using a 120-mesh diamond grinding wheel until the surface is smooth;
s4, putting the polished nano-alumina enhanced white zirconia ceramics into a cobalt oxide powder body for compaction, and preserving heat at 1300 ℃ for 5 hours to obtain pink zirconia ceramics with a colored surface layer;
and S5, mechanically and finely grinding the colored zirconia ceramics by using a 400-mesh diamond fine grinding wheel.
Comparative example 1
The embodiment provides a preparation method of colored zirconia ceramics, which comprises the following steps:
s1, granulating zirconia ceramic powder, dry-pressing and molding, wherein the molding pressure is 150Mpa, finally heating to 1200 ℃ at the speed of 5 ℃/min, keeping the temperature for 1h, then heating to 1600 ℃ at the speed of 2 ℃/min, keeping the temperature for 3h, cooling to room temperature along with a furnace, and sintering to obtain white zirconia ceramic;
s2, roughly grinding the white zirconia ceramics by using a 120-mesh diamond grinding wheel until the surface is smooth;
and S3, mechanically and finely grinding the polished white zirconia ceramics by using a 400-mesh diamond fine grinding wheel to obtain the colored zirconia ceramics.
Comparative example 2
The embodiment provides a preparation method of colored zirconia ceramics, which comprises the following steps:
s1, mixing nano-alumina, zirconia and cobalt oxide powder according to a mass ratio of 5:2, ball-milling and mixing, wherein the ball material ratio is 2:1, ball milling at a rotating speed of 300r/min for 6 hours, and drying to obtain uniformly dispersed composite ceramic powder;
s2, granulating the composite ceramic powder, and carrying out dry pressing molding, wherein the molding pressure is 150Mpa, finally heating to 1200 ℃ at the speed of 5 ℃/min, keeping the temperature for 1h, then heating to 1550 ℃ at the speed of 2 ℃/min, keeping the temperature for 3h, cooling to room temperature along with a furnace, and sintering to obtain blue zirconia ceramic;
s3, performing coarse grinding on the blue zirconia ceramic by using a 120-mesh diamond grinding wheel until the surface is flat;
and S4, mechanically and finely grinding the polished blue zirconia ceramics by using a 400-mesh diamond fine grinding wheel to obtain the colored zirconia ceramics.
Comparative example 3
The embodiment provides a preparation method of colored zirconia ceramics, which comprises the following steps:
s1, mixing nano-alumina, zirconia and cobalt oxide powder according to a mass ratio of 5:1.5, ball milling and mixing, wherein the ball material ratio is 2:1, ball milling at a rotating speed of 300r/min for 6 hours, and drying to obtain uniformly dispersed composite ceramic powder;
s2, granulating the composite ceramic powder, and performing dry pressing molding, wherein the molding pressure is 150Mpa, finally heating to 1200 ℃ at the speed of 5 ℃/min, keeping the temperature for 1h, then heating to 1580 ℃ at the speed of 2 ℃/min, keeping the temperature for 3h, cooling to room temperature along with a furnace, and sintering to obtain pink zirconia ceramic;
s3, roughly grinding the pink zirconia ceramics by using a 120-mesh diamond grinding wheel until the surface is smooth;
and S4, mechanically and finely grinding the polished pink zirconia ceramics by using a 400-mesh diamond fine grinding wheel to obtain the colored zirconia ceramics.
The colored zirconia ceramics prepared in examples 1 and 2 and comparative examples 1 to 4 were tested for mechanical properties such as fracture toughness and bending strength. At least 3 samples were tested per example, comparative example to ensure the reliability of the results.
The specific detection results are as follows:
TABLE 1
| Spline numbering | Bending strength (MPa) |
| Examples 1 to 1 | 1030 |
| Examples 1 to 2 | 1367 |
| Examples 1 to 3 | 1176 |
| Example 2-1 | 1011 |
| Examples 2 to 2 | 1129 |
| Examples 2 to 3 | 1049 |
| Comparative examples 1 to 1 | 812 |
| Comparative examples 1 to 2 | 845 |
| Comparative examples 1 to 3 | 838 |
| Comparative example 2-1 | 603 |
| Comparative examples 2 to 2 | 587 |
| Comparative examples 2 to 3 | 583 |
| Comparative example 3-1 | 465 |
| Comparative examples 3 and 2 | 425 |
| Comparative examples 3 to 3 | 447 |
As can be seen from table 1, compared with the white zirconia bars (comparative example 1) and the colored bars (comparative example 2 and comparative example 3) prepared by completely mixing the colorant, the alumina toughened zirconia bars (example 1 and example 2) have more excellent bending resistance, which is mainly due to the large thermal expansion coefficient of alumina, high elastic modulus and strong binding effect on zirconia particles after sintering and cooling, so that more tetragonal zirconia particles can be more and more effectively retained, thereby achieving the strengthening effect. For the bars of comparative example 2 and comparative example 3 in which the coloring agent was incorporated in its entirety, significant deterioration in bending resistance was caused due to the formation of a brittle solid solution of CoAl2O4 or α -Al2O3-Cr2O3 in the matrix and its weak bonding force with the zirconia particles themselves.
TABLE 2
| Spline numbering | Fracture toughness (Mpam 1/2) |
| Examples 1 to 1 | 11.2 |
| Examples 1 to 2 | 10.2 |
| Examples 1 to 3 | 10.5 |
| Example 2-1 | 10.8 |
| Examples 2 to 2 | 12.1 |
| Examples 2 to 3 | 11.3 |
| Comparative examples 1 to 1 | 7.3 |
| Comparative examples 1 to 2 | 8.1 |
| Comparative examples 1 to 3 | 7.8 |
| Comparative example 2-1 | 4.2 |
| Comparative examples 2 to 2 | 5.1 |
| Comparative examples 2 to 3 | 5.3 |
| Comparative example 3-1 | 4.5 |
| Comparative examples 3 and 2 | 3.9 |
| Comparative examples 3 to 3 | 4.0 |
As can be seen from table 2, compared with the white zirconia sample bar (comparative example 1) and the color sample bars (comparative example 2 and comparative example 3) prepared by completely mixing the colorant, the alumina toughened zirconia sample bars (example 1 and example 2) have more excellent fracture toughness, which is similar to the reason of increasing the bending strength of alumina, mainly because of large thermal expansion coefficient of alumina, high elastic modulus, strong binding effect on zirconia particles after sintering and cooling, so that tetragonal zirconia particles can be more and more effectively retained, and the dispersion distribution of alumina particles is also beneficial to inhibiting the expansion of cracks, thereby improving the fracture toughness. For the specimens of comparative examples 2 and 3 in which the colorant was incorporated as a whole, significant deterioration in fracture toughness was caused by the formation of a brittle solid solution of CoAl2O4 or α -Al2O3-Cr2O3 in the matrix and poor bonding force with the zirconia grains themselves.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A colored zirconia ceramic characterized by: the color zirconia ceramic consists of a surface layer and a core part, wherein the surface layer is a coloring layer, and the core part is nano alumina reinforced zirconia ceramic.
2. The colored zirconia ceramic of claim 1, wherein: the thickness of the coloring layer is 100-250 um, and can be controlled by controlling the heat preservation temperature and time.
3. The colored zirconia ceramic of claim 1, wherein: the coloring layerThe coloring mechanism of (A) is nano aluminum oxide and a colorant C r2 O 3 The chromium corundum is generated through the solid solution reaction to present pink color.
4. The colored zirconia ceramic of claim 1, wherein: the coloring mechanism of the coloring layer is nanometer alumina and a coloring agent Co 2 O 3 The solution reaction generates cobalt blue to appear blue.
5. A method for preparing a colored zirconia ceramic according to claim 1, comprising the steps of:
s1, mixing nano alumina powder and zirconia powder according to a mass ratio of 5:95, performing ball milling and mixing, and drying to obtain uniformly dispersed composite ceramic powder;
s2, forming and sintering the composite ceramic powder to obtain nano-alumina reinforced white zirconia ceramic;
s3, mechanically polishing the nano-alumina reinforced white zirconia ceramics;
s4, embedding the polished nano-alumina enhanced white zirconia ceramics into cobalt oxide or chromium oxide powder and compacting to obtain colored zirconia ceramics with colored surface layers;
and S5, mechanically and finely grinding the colored zirconia ceramics.
6. The method for preparing a colored zirconia ceramic according to claim 5, wherein: in the step S1, the nano alumina powder is high-purity nano-grade a-alumina powder, and the sintering density of 99 percent can be realized at the temperature of more than 1400 ℃.
7. The method for preparing a colored zirconia ceramic according to claim 5, wherein: in the step S2, the forming method of the composite ceramic powder comprises dry pressing forming, injection forming and tape casting forming, wherein the sintering temperature is 1600 ℃, and the heat preservation time is 3 hours.
8. The method for preparing a colored zirconia ceramic according to claim 5, wherein: in step S3, the nano alumina-reinforced white zirconia ceramic is mechanically ground using a 120-mesh diamond grinding wheel.
9. The method for preparing a colored zirconia ceramic according to claim 5, wherein: in step S4, the compacting pressure is 1Mpa, the coloring temperature is 1300 ℃, and the heat preservation time is 5h.
10. The method for preparing a colored zirconia ceramic according to claim 5, wherein: in step S5, the colored zirconia ceramics are mechanically ground using a 400-mesh diamond fine grinding wheel.
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| JP2005306678A (en) * | 2004-04-22 | 2005-11-04 | Matsushita Electric Works Ltd | Zirconia-alumina colored composite ceramic material, and method for manufacturing the same |
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