CN109928752A - A kind of aluminium oxide toughening tantalic acid aluminium ceramics and preparation method thereof - Google Patents
A kind of aluminium oxide toughening tantalic acid aluminium ceramics and preparation method thereof Download PDFInfo
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 152
- 239000000919 ceramic Substances 0.000 title claims abstract description 83
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 46
- 239000002253 acid Substances 0.000 title claims abstract description 45
- 239000004411 aluminium Substances 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 75
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 27
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 27
- PBCFLUZVCVVTBY-UHFFFAOYSA-N tantalum pentoxide Inorganic materials O=[Ta](=O)O[Ta](=O)=O PBCFLUZVCVVTBY-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000005245 sintering Methods 0.000 claims abstract description 17
- 239000002904 solvent Substances 0.000 claims abstract description 10
- 238000000498 ball milling Methods 0.000 claims abstract description 8
- 239000002244 precipitate Substances 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 4
- 238000012545 processing Methods 0.000 claims description 14
- 239000013078 crystal Substances 0.000 claims description 13
- 238000007873 sieving Methods 0.000 claims description 13
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 239000012153 distilled water Substances 0.000 claims description 4
- 235000019441 ethanol Nutrition 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 3
- 229910052580 B4C Inorganic materials 0.000 claims description 2
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000012720 thermal barrier coating Substances 0.000 abstract description 15
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000002156 mixing Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 11
- 229910010293 ceramic material Inorganic materials 0.000 description 9
- 238000000034 method Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 239000012790 adhesive layer Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229910052582 BN Inorganic materials 0.000 description 4
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 4
- 239000004615 ingredient Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229910001233 yttria-stabilized zirconia Inorganic materials 0.000 description 4
- 208000037656 Respiratory Sounds Diseases 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 150000002910 rare earth metals Chemical class 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 229910052573 porcelain Inorganic materials 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000005382 thermal cycling Methods 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000003701 mechanical milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011214 refractory ceramic Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
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Abstract
The present invention relates to Thermal Barrier Coating Technologies fields, specifically disclose a kind of aluminium oxide toughening tantalic acid aluminium ceramics, the ceramics are by Al2O3Powder and Ta2O5Powder sintered to form, the ceramics are by Al2O3Phase and AlTaO4Phase composition, Al2O3Phase Dispersed precipitate is in AlTaO4Xiang Zhong, the chemical formula of the ceramics are xAl2O3‑AlTaO4, wherein x > 0.The preparation method of the ceramics include weigh Al:Ta molar ratio be (1+2x): the Al of 1 (x > 0)2O3Powder and Ta2O5Powder, is added solvent mixing, carries out ball milling using ball mill, obtains powders A；Powders A is sintered, aluminium oxide toughening tantalic acid aluminium ceramics are obtained, wherein the temperature being sintered is 1300~1500 DEG C, sintering time is 5~10min.The aluminium oxide toughening tantalic acid aluminium ceramic fracture toughness obtained using the technical solution in this patent is high, and as thermal barrier coating in use, thermal barrier coating failure will not be led to the problem of.
Description
Technical field
The present invention relates to Thermal Barrier Coating Technologies fields, in particular to aluminium oxide toughening tantalic acid aluminium ceramics and preparation method thereof.
Background technique
Thermal barrier coating is a kind of advanced ceramic material system, is mainly used in aero-engine industry, plays heat-insulated, drop
Thermal mismatching between low coating and alloy substrate is effective against particle impacting to protect aero-engine high-temperature area components
Effect, it is desirable that it is with good thermodynamic property, such as low thermal conductivity, high thermal expansion coefficient and high-temperature stability
Deng.
Now widely used thermal barrier coating mainly has yttria-stabilized zirconia (YSZ) and rare earth zirconate
(RE2Zr2O7) etc., but there is a degree of deficiency: YSZ uses lower (≤1200 DEG C of temperature), and thermal conductivity is relatively
It is high；And rare earth zirconate then has that thermal expansion coefficient is lower, this just promote researcher look for substitute it is above-mentioned
The thermal barrier coating of ceramic material, Levi of the Harvard University Clarke professor seminar in 2007 with University of California--Santa Barbara
Professor etc. proposes yttrium tantalate (YTaO4) ferroelastics is expected to as novel heat barrier coat material, Wang in 2016 et al. passes through solid
Rare earth tantalate block materials have been made in phase reaction method, have shown that thermal conductivity is much smaller than the conclusion of YSZ material, are tantalates in heat
Application on barrier coating provides theoretical basis.
It is well known that brittleness is always the major obstacle of its application for the engineering ceramics of structure.Many research works
All be around overcoming brittleness, the theme expansion of toughening in other words, research finds to draw in the ceramic base phase of ceramic material
Enter toughening phase, plays the role of promotion to the refinement of crystal grain, so that the toughness of ceramic material increases, but due to toughening
Mutually usually ingredient, property etc. have bigger difference with ceramic base phase, therefore following problems will occur: 1, thermal barrier coating (ceramic layer)
Occur volume change in Thermal Cycling, mutually occurs the phenomenon that volume mismatch with toughening so as to cause ceramic base phase, and volume
Mismatch easily leads to coating and generates internal stress, promotes coating cracking, is unfavorable for the long-time service of thermal barrier coating；2, toughening is mutually in high temperature
Lower to react with basis material or ceramic base phase, so that thermal barrier coating fails, these phenomenons can seriously reduce thermal barrier coating
Service life.Therefore it to find a kind of not only with good toughness but also be not in the ceramic material of the above problem be current heat
The emphasis of barrier coating research.
Summary of the invention
The present invention provides a kind of aluminium oxide toughening tantalic acid aluminium ceramics and preparation method thereof, to solve making pottery in the prior art
While toughening phase is introduced in porcelain sill to increase toughness, it may occur that the problem of thermal barrier coating fails.
In order to achieve the above object, base case of the invention are as follows:
A kind of aluminium oxide toughening tantalic acid aluminium ceramics, the ceramics are by Al2O3Powder and Ta2O5It is powder sintered to form, the ceramics
Crystal structure is by Al2O3Phase and AlTaO4Phase composition, Al2O3Phase Dispersed precipitate is in AlTaO4The chemical formula of Xiang Zhong, the ceramics is
xAl2O3-AlTaO4, wherein x > 0.
The technical principle and effect of this base case are:
1, a kind of aluminium oxide toughening tantalic acid aluminium ceramics, the Al of use in this base case2O3Powder and Ta2O5It is powder sintered
It forms, the tantalic acid aluminium ceramics of aluminium oxide toughening has been made, has been detected its fracture toughness with higher, meets thermal barrier coating multiple
Impact property requirement under miscellaneous working environment, simultaneously because the toughening in the program is mutually Al2O3Phase, Al2O3Mutually not it is being sintered
Newly-generated phase in the process, it may be said that toughening phase Al in bright this programme2O3Phase and AlTaO4It will not mutually react at high temperature,
Al simultaneously2O3Dispersed precipitate is in AlTaO in the form of phase4Xiang Zhong, so that being not in that volume is lost between toughening phase and ceramic base phase
With the phenomenon that, thus solve in ceramic based material in the prior art introduce toughening mutually to increase toughness while, it may occur that heat
The problem of barrier coating fails.
2, biggish toughening phase is differed with base phase ingredient and structure due to introducing in ceramic base phase, can ceramic layer be existed
Because ceramic base phase is different from the volume change of toughening phase in Thermal Cycling, mutually there is volume with toughening so as to cause ceramic base phase
The problem of mismatch, therefore inventor wants that finding one kind can be made and ceramic base phase constituent and the similar toughening phase of structure, this Shen
Inventor's script scheme please is to prepare tantalic acid aluminium (AlTaO4) ceramics when additionally add into Al2O3, it is and pottery with forming component
Porcelain base phase (AlTaO4) ingredient and the close Al of structure3TaO7Toughening phase, but actually inventor found in R&D process it is more
Remaining Al2O3There is no and AlTaO4Form Al3TaO7, but Dispersed precipitate is in tantalic acid aluminium (AlTaO in the form of phase4) ceramic base
Xiang Zhong.
3, aluminium oxide toughening tantalic acid aluminium ceramics have high fracture toughness the reason is that, due to Al in this base case2O3Powder
End and Ta2O5Ingredient of the powder with molar ratio greater than 1:1 is added, extra Al2O3Due to will not be with AlTaO4Reaction is generated, therefore
Al2O3Mutually in AlTaO4In base phase forming process, the grain growth of base phase is limited, so that AlTaO4Crystal grain in base phase is refined,
So that in same volume, AlTaO4Crystal boundary amount in base phase improves, and then improves the fracture toughness of ceramics.
4, since ceramic material as thermal barrier coating when acting on basis material, it usually needs pass through adhesive layer and base
Body material combines, and Al is usually contained in adhesive layer2O3, due to containing Al in the ceramics of the technical program2O3Phase so that its with
The adhesive property of adhesive layer is more preferable, while embodying ceramics in the technical program at high temperature will not be anti-with adhesive layer generation chemistry
It answers, in this way it is avoided that because thermal barrier coating reacts the problem of leading to failure with adhesive layer.
Further, a kind of preparation method of aluminium oxide toughening tantalic acid aluminium ceramics, comprising the following steps:
Step (1): the molar ratio for weighing Al:Ta is (1+2x): the Al of 1 (x > 0)2O3Powder and Ta2O5Powder is added molten
Agent mixing carries out ball milling using ball mill, obtains powders A；
Step (2): the powders A that step (1) obtains is sintered, and aluminium oxide toughening tantalic acid aluminium ceramics is obtained, wherein burning
The temperature of knot is 1300~1500 DEG C, and sintering time is 5~10min.
The utility model has the advantages that the aluminium oxide toughening tantalic acid aluminium ceramics being prepared using the method for step (1) and step (2), it should
Dispersed precipitate is in tantalic acid aluminium phase in the form of phase for aluminium oxide in ceramics, so that the fracture toughness of the ceramics enhances, as thermal boundary
Coating anti-impact force improves.
Further, Ball-milling Time is 5~10h in the step (1), and the revolving speed of ball mill is 200~300r/min.
The utility model has the advantages that using in this programme rotational speed of ball-mill and the time, can be by Al2O3Powder and Ta2O5Powder is sufficient
It is uniformly mixed.
Further, powders A is dried before sintering in the step (2), and drying temperature is 50~90 DEG C, dry
Time is 12~16h.
The utility model has the advantages that since step (1) joined solvent into powder in ball milling, to powders A in step (2) into
Row be dried, using in this programme drying temperature and the time, enable to the solvent in powder sufficiently to volatilize away.
Further, the powders A in the step (2) carries out sieving processing after drying, and the sieve mesh of sieving is 100~
300 mesh.
The utility model has the advantages that the purpose of sieving is the big diameter powders phase that will be bonded together in mechanical milling process in powders A
It is screened out, obtains the powders A that powder diameter is evenly distributed, so that the size distribution of the ceramic internal grain of sintering is uniformly distributed.
Further, the powders A in the step (2) carries out pressure maintaining processing after sieving, specifically: by the powder after sieving
Last A is placed in mold, and dwell pressure is 4~6MPa, and the dwell time is 2~6min.
The utility model has the advantages that the purpose of pressure maintaining processing is, the gas extrusion in powders A is gone out, so that the aluminium oxide of preparation
The crystal boundary of toughening tantalic acid aluminium is clear, intercrystalline to be well combined, it should be noted that if in sintering, containing big in powder A
The gas of amount, due in crystal, intercrystalline interface can be it is highest, gas is concentrated mainly on crystal boundary in the effect that crystal boundary is assembled
Place reduces ceramic material consistency obtained so that biggish gap occur in these places.
Further, the powders A in the step (2) carries out boron carbide coating processing on its surface after pressure maintaining processing.
The utility model has the advantages that due in discharge plasma sintering, if being not coated by boron nitride, the surface of powders A will directly with
Graphite jig and carbon paper contact, carbon will penetrate into powder in high-temperature reaction process, and participate in reaction and form the second phase, from
And make ceramic block obtained impure；Carbon will be unable to the life that the second phase is directly hindered with sample contacts after coating boron nitride
At, and boron nitride itself is one kind of refractory ceramics, highly stable will not decompose will not participate in reacting at high temperature.
Further, sintering carries out under pressure in the step (2), and sintering pressure is 200~400MPa.
The utility model has the advantages that being sintered at this pressure, the high ceramic block of consistency can be obtained.
Further, the solvent in the step (1) is ethyl alcohol or distilled water.
The utility model has the advantages that ethyl alcohol and distilled water are to Al2O3Powder and Ta2O5The dispersibility of powder is preferable, so that Al2O3Powder and
Ta2O5Powder can be mixed more fully.
Further, the Al in the step (1)2O3Powder and Ta2O5The molar ratio of powder and solvent be (3:1)~(5:
1)。
The utility model has the advantages that verifying of the inventor by experiment, in Al2O3Powder and Ta2O5The ratio of powder and solvent is in the model
Under enclosing, obtained powders A mixes the most abundant.
Detailed description of the invention
Fig. 1 is aluminium oxide toughening tantalic acid aluminium (1Al made from the embodiment of the present invention 22O3+AlTaO4) ceramics XRD diagram；
Fig. 2 is aluminium oxide toughening tantalic acid aluminium (2Al made from the embodiment of the present invention 32O3+AlTaO4) ceramics XRD diagram；
Fig. 3 is aluminium oxide toughening tantalic acid aluminium (1Al made from the embodiment of the present invention 22O3+AlTaO4) ceramics SEM figure；
Fig. 4 is aluminium oxide toughening tantalic acid aluminium (2Al made from the embodiment of the present invention 32O3+AlTaO4) ceramics SEM figure.
Specific embodiment
It is further described below by specific embodiment:
A kind of aluminium oxide toughening tantalic acid aluminium ceramics, the ceramics are by Al2O3Powder and Ta2O5It is powder sintered to form, the ceramics by
Al2O3Phase and AlTaO4Phase composition, Al2O3Phase Dispersed precipitate is in AlTaO4Xiang Zhong, the chemical formula of the ceramics are xAl2O3-AlTaO4,
Wherein x > 0.
The preparation method of above-mentioned aluminium oxide toughening tantalic acid aluminium ceramics, including the following steps:
Step (1): the molar ratio for weighing Al:Ta is (1+2x): the Al of 1 (x > 0)2O3Powder and Ta2O5Powder is added molten
Agent distilled water or ethyl alcohol are mixed, above two powder (Al2O3Powder and Ta2O5Powder) with the ratio of solvent be (3:1)~
(5:1) carries out ball milling using ball mill, obtains powders A after dry；Wherein ball mill uses frequency conversion planetary ball mill, model
For XQM, Ball-milling Time is 5~10h, and the revolving speed of ball mill is 200~300r/min, and raw material A l2O3Powder and Ta2O5Powder
Purity be not less than 99.9%.
Step (2): carrying out sieving processing after the powders A that step (1) obtains is dried, and wherein drying temperature is 50~90
DEG C, drying time is 12~16h, and the sieve mesh of sieving is 100~300 mesh；Powder after sieving is subjected to pressure maintaining processing, specifically
Are as follows: the powders A after sieving is placed in mold, dwell pressure is 4~6MPa, and the dwell time is 2~6min；Powders A is being protected
After pressure processing, mold is laid flat, boron nitride is sprayed on the surface of powders A manually afterwards, carries out pressure sintering afterwards, sintering pressure is
200~400MPa, the temperature of sintering are 1300~1500 DEG C, and sintering time is 5~10min.
The tantalic acid aluminium ceramics of aluminium oxide toughening have been obtained using the above method.Above method preparation is used to absolutely prove
Aluminium oxide toughening tantalic acid aluminium ceramics fracture toughness with higher, now selects 6 groups of embodiments therein to be illustrated.
Table 1 is the design parameter of the embodiment of the present invention 1~6:
It enumerates the aluminium oxide toughening tantalic acid aluminium ceramics that 3 groups of comparative examples and Examples 1 to 6 obtain and compares experiment:
Comparative example 1: the difference from embodiment 1 is that, x=0, i.e. Al2O3Powder and Ta2O5The molar ratio of powder is 1:1.
Comparative example 2: the difference from embodiment 1 is that, x=10, i.e. Al2O3Powder and Ta2O5The molar ratio of powder is 21:
1。
Comparative example 3: the difference from embodiment 1 is that, step (2) does not carry out pressure maintaining processing before sintering.
The ceramic material now obtained to Examples 1 to 6 and comparative example 1~3 detects:
1, XRD characterization:
It is detected using the ceramic block that X-ray diffractometer obtains Examples 1 to 6 and comparative example 1~3, to implement
For the ceramic block that example 2 and embodiment 3 obtain, XRD spectrum difference is as depicted in figs. 1 and 2, and XRD diffraction maximum is corresponding
Standard PDF card base peak correspond explanation both pottery blocks in be two phase structure, i.e. aluminium oxide and tantalic acid
The two-phase mixture of aluminium, and with Al in increase Fig. 2 of alumina content2O3Diffraction peak intensity be apparently higher than it is strong in Fig. 1
Degree, illustrates with Al2O3The increase of content its not with tantalic acid reactive aluminum, being capable of effective toughening tantalic acid aluminium.And comparative example 1
Testing result shows it for the single-phase of tantalic acid aluminium.
2, SEM is characterized:
It is detected using the ceramic block that scanning electron microscope obtains Examples 1 to 6 and comparative example 1~3, with embodiment 2
For the ceramic block obtained with embodiment 3, SEM spectrum difference is as shown in Figure 3 and Figure 4, it is known that, oxygen made from embodiment 2
Change aluminium toughening tantalic acid aluminium (1Al2O3+AlTaO4) ceramics and embodiment 3 made from aluminium oxide toughening tantalic acid aluminium (2Al2O3+AlTaO4)
The grain size of ceramics is relatively uniform, and two intracorporal grain sizes of ceramic block illustrate aluminium oxide between 1~10 micron
The increase of content does not generate large effect to its grain size.It is connected between crystal grain in ceramic block preferably, it is imperforate
In the presence of.
There is a small amount of crackle in ceramic block made from embodiment 3, this is because alumina content increases, it is raw in crystal grain
Two kinds of out of phase crystal grain mutual extrusions, which generate stress, in growth process leads to the generation of crackle.In addition detection discovery comparative example 2 is made
Ceramic block, it is internal that there is more crackle, this also illustrates the content of aluminium oxide is not The more the better, but have
Certain limit.And in the ceramic crystal structure that comparative example 3 obtains, due to not carrying out pressure maintaining processing, the defects of there are stomatas for inside.
3, fracture toughness
Using ceramic block made from Vickers testing example 1~6 and comparative example 1~3, then according to impression
Catercorner length and the crack length at four angles calculate the fracture toughness of material, and testing result is as shown in table 2 below.
The formula being related to is Vickers hardness:(unit GPa)
Fracture toughness: KIC=5.1636HV·(d/2)2·c-1.5(units MPa .m1/2)
Table 2
To sum up, aluminium oxide toughening tantalic acid aluminium ceramic block prepared by the present embodiment 1~6, Al2O3Phase Dispersed precipitate exists
AlTaO4Make in phase ceramic material have preferable fracture toughness, be with embodiment 4 it is best, fracture toughness reaches
10.6MPa.m1/2。
What has been described above is only an embodiment of the present invention, and the common sense such as well known specific structure and characteristic are not made herein in scheme
Excessive description.It, without departing from the structure of the invention, can be with it should be pointed out that for those skilled in the art
Several modifications and improvements are made, these also should be considered as protection scope of the present invention, these all will not influence what the present invention was implemented
Effect and patent practicability.The scope of protection required by this application should be based on the content of the claims, in specification
The records such as specific embodiment can be used for explaining the content of claim.
Claims (10)
1. a kind of aluminium oxide toughening tantalic acid aluminium ceramics, it is characterised in that: the ceramics are by Al2O3Powder and Ta2O5It is powder sintered to form,
The ceramics are by Al2O3Phase and AlTaO4Phase composition, Al2O3Crystal grain Dispersed precipitate is in AlTaO4The chemical formula of Xiang Zhong, the ceramics is
xAl2O3-AlTaO4, wherein x > 0.
2. a kind of preparation method of aluminium oxide toughening tantalic acid aluminium ceramics according to claim 1, it is characterised in that: including with
Lower step:
Step (1): the molar ratio for weighing Al:Ta is (1+2x): the Al of 1 (x > 0)2O3Powder and Ta2O5It is mixed that solvent is added in powder
It closes, ball milling is carried out using ball mill, obtains powders A；
Step (2): the powders A that step (1) obtains is sintered, and obtains aluminium oxide toughening tantalic acid aluminium ceramics, wherein be sintered
Temperature is 1300~1500 DEG C, and sintering time is 5~10min.
3. a kind of preparation method of aluminium oxide toughening tantalic acid aluminium ceramics according to claim 2, it is characterised in that: the step
Suddenly Ball-milling Time is 5~10h in (1), and the revolving speed of ball mill is 200~300r/min.
4. a kind of preparation method of aluminium oxide toughening tantalic acid aluminium ceramics according to claim 2, it is characterised in that: the step
Suddenly powders A is dried before sintering in (2), and drying temperature is 50~90 DEG C, and drying time is 12~16h.
5. a kind of preparation method of aluminium oxide toughening tantalic acid aluminium ceramics according to claim 4, it is characterised in that: the step
Suddenly the powders A in (2) carries out sieving processing after drying, and the sieve mesh of sieving is 100~300 mesh.
6. a kind of preparation method of aluminium oxide toughening tantalic acid aluminium ceramics according to claim 5, it is characterised in that: the step
Suddenly the powders A in (2) carries out pressure maintaining processing after sieving, specifically: the powders A after sieving is placed in mold, pressure maintaining
Pressure is 4~6MPa, and the dwell time is 2~6min.
7. a kind of preparation method of aluminium oxide toughening tantalic acid aluminium ceramics according to claim 6, it is characterised in that: the step
Suddenly the powders A in (2) carries out boron carbide coating processing on its surface after pressure maintaining processing.
8. a kind of preparation method of aluminium oxide toughening tantalic acid aluminium ceramics according to claim 7, it is characterised in that: the step
Suddenly sintering carries out under pressure in (2), and sintering pressure is 200~400MPa.
9. a kind of preparation method of aluminium oxide toughening tantalic acid aluminium ceramics according to claim 2, it is characterised in that: the step
Suddenly the solvent in (1) is ethyl alcohol or distilled water.
10. a kind of preparation method of aluminium oxide toughening tantalic acid aluminium ceramics according to claim 2, it is characterised in that: described
Al in step (1)2O3Powder and Ta2O5The molar ratio of powder and solvent is (3:1)~(5:1).
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111943672A (en) * | 2020-08-28 | 2020-11-17 | 昆明理工大学 | Preparation method of aluminum oxide toughened aluminum niobate ceramic coating with continuously-changed components |
| CN112939600A (en) * | 2021-04-30 | 2021-06-11 | 昆明理工大学 | Nanocrystalline A4B2O9 type niobate ceramic prepared by ultralow temperature sintering and method thereof |
| CN112979312A (en) * | 2021-04-30 | 2021-06-18 | 昆明理工大学 | AB2O6Niobate ceramic and preparation method thereof |
| CN112979311A (en) * | 2021-04-30 | 2021-06-18 | 昆明理工大学 | Nanocrystalline A4B2O9 type tantalate ceramic prepared by ultralow temperature sintering and method thereof |
| CN114044671A (en) * | 2021-08-31 | 2022-02-15 | 陕西天璇涂层科技有限公司 | Method for preparing high-entropy rare earth tantalate hollow sphere powder by centrifugal spray granulation method |
| CN115571915A (en) * | 2022-10-08 | 2023-01-06 | 昆明理工大学 | Aluminum tantalate powder and preparation method thereof, and aluminum tantalate ceramic and preparation method and application thereof |
| CN115784605A (en) * | 2022-12-01 | 2023-03-14 | 武汉科技大学 | Tantalate additive for aluminum-silicon glass and preparation method and application thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111943672A (en) * | 2020-08-28 | 2020-11-17 | 昆明理工大学 | Preparation method of aluminum oxide toughened aluminum niobate ceramic coating with continuously-changed components |
| CN111943672B (en) * | 2020-08-28 | 2021-08-31 | 昆明理工大学 | Preparation method of aluminum oxide toughened aluminum niobate ceramic coating with continuously-changed components |
| CN112939600A (en) * | 2021-04-30 | 2021-06-11 | 昆明理工大学 | Nanocrystalline A4B2O9 type niobate ceramic prepared by ultralow temperature sintering and method thereof |
| CN112979312A (en) * | 2021-04-30 | 2021-06-18 | 昆明理工大学 | AB2O6Niobate ceramic and preparation method thereof |
| CN112979311A (en) * | 2021-04-30 | 2021-06-18 | 昆明理工大学 | Nanocrystalline A4B2O9 type tantalate ceramic prepared by ultralow temperature sintering and method thereof |
| CN114044671A (en) * | 2021-08-31 | 2022-02-15 | 陕西天璇涂层科技有限公司 | Method for preparing high-entropy rare earth tantalate hollow sphere powder by centrifugal spray granulation method |
| CN115571915A (en) * | 2022-10-08 | 2023-01-06 | 昆明理工大学 | Aluminum tantalate powder and preparation method thereof, and aluminum tantalate ceramic and preparation method and application thereof |
| CN115784605A (en) * | 2022-12-01 | 2023-03-14 | 武汉科技大学 | Tantalate additive for aluminum-silicon glass and preparation method and application thereof |
| CN115784605B (en) * | 2022-12-01 | 2024-08-13 | 武汉科技大学 | Tantalate additive for aluminosilicate glass and preparation method and application thereof |
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