CN109055828A - High-strength environment-friendly aluminum alloy composite material - Google Patents
High-strength environment-friendly aluminum alloy composite material Download PDFInfo
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- CN109055828A CN109055828A CN201810911036.3A CN201810911036A CN109055828A CN 109055828 A CN109055828 A CN 109055828A CN 201810911036 A CN201810911036 A CN 201810911036A CN 109055828 A CN109055828 A CN 109055828A
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 32
- 239000002131 composite material Substances 0.000 title claims abstract description 15
- 239000000956 alloy Substances 0.000 claims abstract description 31
- 239000012535 impurity Substances 0.000 claims abstract description 13
- 229910045601 alloy Inorganic materials 0.000 claims description 27
- 229910052684 Cerium Inorganic materials 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 11
- 229910052716 thallium Inorganic materials 0.000 claims description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical group [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- 238000003723 Smelting Methods 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 229910052748 manganese Inorganic materials 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 5
- 238000007670 refining Methods 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 5
- 229940070527 tourmaline Drugs 0.000 claims description 5
- 229910052613 tourmaline Inorganic materials 0.000 claims description 5
- 239000011032 tourmaline Substances 0.000 claims description 5
- 238000010792 warming Methods 0.000 claims description 5
- 229910018125 Al-Si Inorganic materials 0.000 claims description 3
- 229910018520 Al—Si Inorganic materials 0.000 claims description 3
- 229910018575 Al—Ti Inorganic materials 0.000 claims description 3
- 229910017082 Fe-Si Inorganic materials 0.000 claims description 3
- 229910002593 Fe-Ti Inorganic materials 0.000 claims description 3
- 229910017133 Fe—Si Inorganic materials 0.000 claims description 3
- 229910018643 Mn—Si Inorganic materials 0.000 claims description 3
- 239000012298 atmosphere Substances 0.000 claims description 2
- 239000001307 helium Substances 0.000 claims description 2
- 229910052734 helium Inorganic materials 0.000 claims description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 1
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 4
- 230000001988 toxicity Effects 0.000 abstract 1
- 231100000419 toxicity Toxicity 0.000 abstract 1
- 239000011572 manganese Substances 0.000 description 13
- 239000012300 argon atmosphere Substances 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 229910052793 cadmium Inorganic materials 0.000 description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a high-strength environment-friendly aluminum alloy composite material, which comprises, by weight, 0.5-5% of Mn, 0.1-1% of Fe, 0.02-0.2% of Si, 0.005-0.02% of Ti, 0.003-0.01% of Tl, 0.002-0.008% of Tc, 0.001-0.005% of Ce, and the balance of Al and inevitable impurities. The invention has the advantages that the tensile strength of the manufactured aluminum alloy material is generally more than 700MPa, the yield strength is generally more than 650MPa, and the elongation can be kept above 9.0%. In addition, heavy metal with obvious biological toxicity is not used, so that the environment is not polluted, and the human health is not influenced.
Description
Technical field
The present invention relates to aluminum alloy materials technical fields, and in particular to a kind of High-strength environmentally-friefuran Al alloy composite.
Background technique
Aluminium alloy is the alloy using aluminium as matrix element, has that density is low, specific strength is high, plasticity is good, electric conductivity and thermally conductive
The characteristics of property is good, excellent anti-corrosion performance, to be widely applied in fields such as space flight, aviation, automobiles.Common alloy
Member is known as copper, manganese, magnesium, cadmium, lead, chromium etc..But existing intensity of aluminum alloy universal lower low, cadmium, lead, chromium for containing simultaneously etc.
Element belongs to the significant heavy metal of bio-toxicity, these heavy metals are difficult to be decomposed, and is easy to pollute the environment.
Summary of the invention
The purpose of the present invention is to provide a kind of High-strength environmentally-friefuran Al alloy composites, and which solve traditional aluminium alloys
The problem of strength of materials is relatively low and be easy to cause environmental pollution.
The present invention through the following technical solutions to achieve the above objectives:
A kind of High-strength environmentally-friefuran Al alloy composite, preparing raw material accounting by weight includes 0.5-5%Mn, 0.1-
1%Fe, 0.02-0.2%Si, 0.005-0.02Ti, 0.003-0.01%Tl, 0.002-0.008%Tc, 0.001-0.005%
Ce, surplus are Al and inevitable impurity, are prepared by the following method:
(1) Al ingot, Mn ingot, Fe ingot, Al-Si or Mn-Si or Fe-Si intermediate alloy are preheating to 250-300 DEG C；
(2) then Al ingot, Mn ingot, Fe ingot are added in smelting furnace, and are melted in protective gas atmosphere, after fusing
500-550 DEG C of heat preservation 1h, then it is warming up to 660-700 DEG C；
(3) again by Al-Ti or Mn-Ti or Fe-Ti intermediate alloy, Al-Tl or Mn-Tl or Fe-Tl intermediate alloy, Al-Tc
Or Mn-Tc or Fe-Tc intermediate alloy, Al-Ce or Mn-Ce or Fe-Ce intermediate alloy are added in smelting furnace, it will after fusing
Temperature is raised to 660-700 DEG C, keeps the temperature 0.5h；
(4) tourmaline powder is added, stands after mixing evenly, then fishes out slag, obtain primary aluminum alloy melt；
(5) aluminum alloy melt is transferred in the refining furnace of 650-700 DEG C of constant temperature, leads to protective gas, be cast into after standing 1h
Ingot casting is placed in the pressure of 0.8-1.0MPa, is stood for 24 hours, is obtained primary finished product；
(6) pressure locating for primary finished product is adjusted to 0.6-0.8MPa, stands 2h；
(7) pressure locating for primary finished product is adjusted to 0.3-0.5MPa, stands 2h；
(8) pressure locating for primary finished product is adjusted to 0.1MPa, stands 2h；
(9) primary finished product is surface-treated, obtains final products.
Further improvement lies in that it is described prepare raw material accounting by weight include 3%Mn, 0.5%Fe, 0.1%Si,
0.01Ti, 0.006%Tl, 0.004%Tc, 0.003%Ce, surplus is Al and inevitable impurity, and impurity content is less than
0.1%.
Further improvement lies in that the protective gas is argon gas or helium.
Further improvement lies in that specifically operation is to be placed in the pressure of 0.8MPa to step (5).
Further improvement lies in that pressure locating for primary finished product is adjusted to as 0.7MPa by step (6).
Further improvement lies in that pressure locating for primary finished product is adjusted to as 0.4MPa by step (7).
The beneficial effects of the present invention are: manufactured aluminum alloy materials tensile strength is generally greater than 700MPa, yield strength
Generally it is greater than 650MPa, and elongation percentage is positively retained at 9.0% or more.In addition, the significant heavy metal of bio-toxicity is not used,
It not can cause environmental pollution, human health will not be influenced.
Specific embodiment
The application is described in further detail below with reference to embodiment, it is necessary to it is indicated herein to be, it is real in detail below
The mode of applying is served only for that the application is further detailed, and should not be understood as the limitation to the application protection scope, the field
Technical staff some nonessential modifications and adaptations can be made to the application according to above-mentioned application content.
Embodiment 1
A kind of High-strength environmentally-friefuran Al alloy composite, prepare raw material accounting by weight include 0.5%Mn, 0.1%Fe,
0.02%Si, 0.005Ti, 0.003%Tl, 0.002%Tc, 0.001%Ce, surplus are Al and inevitable impurity, impurity
Content is less than 0.1%.
It is prepared by the following method:
(1) Al ingot, Mn ingot, Fe ingot, Al-Si intermediate alloy are preheating to 250 DEG C；
(2) then Al ingot, Mn ingot, Fe ingot are added in smelting furnace, and melted in argon atmosphere, at 500 DEG C after fusing
1h is kept the temperature, then is warming up to 660 DEG C；
(3) Al-Ti intermediate alloy, Al-Tl intermediate alloy, Al-Tc intermediate alloy, Al-Ce intermediate alloy are added to again
It is added in smelting furnace, temperature is raised to 660 DEG C after fusing, keep the temperature 0.5h；
(4) tourmaline powder is added, stands after mixing evenly, then fishes out slag, obtain primary aluminum alloy melt；
(5) aluminum alloy melt is transferred in the refining furnace of 650 DEG C of constant temperature, leads to argon gas, be cast into ingot casting, juxtaposition after standing 1h
In the pressure of 0.8MPa, stands for 24 hours, obtain primary finished product；
(6) pressure locating for primary finished product is adjusted to 0.7MPa, stands 2h；
(7) pressure locating for primary finished product is adjusted to 0.4MPa, stands 2h；
(8) pressure locating for primary finished product is adjusted to 0.1MPa, stands 2h；
(9) primary finished product is surface-treated, obtains final products.
Embodiment 2
A kind of High-strength environmentally-friefuran Al alloy composite, prepare raw material accounting by weight include 3%Mn, 0.5%Fe,
0.1%Si, 0.01Ti, 0.006%Tl, 0.004%Tc, 0.003%Ce, surplus are Al and inevitable impurity, and impurity
Content is less than 0.1%.
It is prepared by the following method:
(1) Al ingot, Mn ingot, Fe ingot, Mn-Si intermediate alloy are preheating to 280 DEG C；
(2) then Al ingot, Mn ingot, Fe ingot are added in smelting furnace, and melted in argon atmosphere, at 520 DEG C after fusing
1h is kept the temperature, then is warming up to 680 DEG C；
(3) Mn-Ti intermediate alloy, Mn-Tl intermediate alloy, Mn-Tc intermediate alloy, Mn-Ce intermediate alloy are added to again
It is added in smelting furnace, temperature is raised to 680 DEG C after fusing, keep the temperature 0.5h；
(4) tourmaline powder is added, stands after mixing evenly, then fishes out slag, obtain primary aluminum alloy melt；
(5) aluminum alloy melt is transferred in the refining furnace of 680 DEG C of constant temperature, leads to argon gas, be cast into ingot casting, juxtaposition after standing 1h
In the pressure of 0.8MPa, stands for 24 hours, obtain primary finished product；
(6) pressure locating for primary finished product is adjusted to 0.7MPa, stands 2h；
(7) pressure locating for primary finished product is adjusted to 0.4MPa, stands 2h；
(8) pressure locating for primary finished product is adjusted to 0.1MPa, stands 2h；
(9) primary finished product is surface-treated, obtains final products.
Embodiment 3
A kind of High-strength environmentally-friefuran Al alloy composite, prepare raw material accounting by weight include 5%Mn, 1%Fe,
0.2%Si, 0.02Ti, 0.01%Tl, 0.008%Tc, 0.005%Ce, surplus are Al and inevitable impurity.And impurity contains
Amount is less than 0.1%.
It is prepared by the following method:
(1) Al ingot, Mn ingot, Fe ingot, Fe-Si intermediate alloy are preheating to 300 DEG C；
(2) then Al ingot, Mn ingot, Fe ingot are added in smelting furnace, and melted in argon atmosphere, at 550 DEG C after fusing
1h is kept the temperature, then is warming up to 700 DEG C；
(3) Fe-Ti intermediate alloy, Fe-Tl intermediate alloy, Fe-Tc intermediate alloy, Fe-Ce intermediate alloy are added to again
It is added in smelting furnace, temperature is raised to 700 DEG C after fusing, keep the temperature 0.5h；
(4) tourmaline powder is added, stands after mixing evenly, then fishes out slag, obtain primary aluminum alloy melt；
(5) aluminum alloy melt is transferred in the refining furnace of 700 DEG C of constant temperature, leads to argon gas, be cast into ingot casting, juxtaposition after standing 1h
In the pressure of 0.8MPa, stands for 24 hours, obtain primary finished product；
(6) pressure locating for primary finished product is adjusted to 0.7MPa, stands 2h；
(7) pressure locating for primary finished product is adjusted to 0.4MPa, stands 2h；
(8) pressure locating for primary finished product is adjusted to 0.1MPa, stands 2h；
(9) primary finished product is surface-treated, obtains final products.
To implementing 1, embodiment 2 and implement 3 to make performance detection experiment respectively, including tensile strength, yield strength and prolong
Rate is stretched, and following table is made:
| Tensile strength (MPa) | Yield strength (MPa) | Elongation percentage (%) | |
| Embodiment 1 | 715 | 654 | 9.1 |
| Embodiment 2 | 729 | 672 | 9.2 |
| Embodiment 3 | 708 | 661 | 9.5 |
As can be seen from the above table, manufactured aluminum alloy materials tensile strength is generally greater than 700MPa, and yield strength is generally big
In 650MPa, and elongation percentage is positively retained at 9.0% or more.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.
Claims (6)
1. a kind of High-strength environmentally-friefuran Al alloy composite, it is characterised in that: preparing raw material accounting by weight includes 0.5-5%
Mn, 0.1-1%Fe, 0.02-0.2%Si, 0.005-0.02Ti, 0.003-0.01%Tl, 0.002-0.008%Tc, 0.001-
0.005%Ce, surplus are Al and inevitable impurity, are prepared by the following method:
(1) Al ingot, Mn ingot, Fe ingot, Al-Si or Mn-Si or Fe-Si intermediate alloy are preheating to 250-300 DEG C；
(2) then Al ingot, Mn ingot, Fe ingot are added in smelting furnace, and are melted in protective gas atmosphere, in 500- after fusing
550 DEG C of heat preservation 1h, then it is warming up to 660-700 DEG C；
(3) again by Al-Ti or Mn-Ti or Fe-Ti intermediate alloy, Al-Tl or Mn-Tl or Fe-Tl intermediate alloy, Al-Tc or Mn-
Tc or Fe-Tc intermediate alloy, Al-Ce or Mn-Ce or Fe-Ce intermediate alloy are added in smelting furnace, by temperature after fusing
It is raised to 660-700 DEG C, keeps the temperature 0.5h；
(4) tourmaline powder is added, stands after mixing evenly, then fishes out slag, obtain primary aluminum alloy melt；
(5) aluminum alloy melt is transferred in the refining furnace of 650-700 DEG C of constant temperature, leads to protective gas, be cast into ingot casting after standing 1h,
It is placed in the pressure of 0.8-1.0MPa, stands for 24 hours, obtain primary finished product；
(6) pressure locating for primary finished product is adjusted to 0.6-0.8MPa, stands 2h；
(7) pressure locating for primary finished product is adjusted to 0.3-0.5MPa, stands 2h；
(8) pressure locating for primary finished product is adjusted to 0.1MPa, stands 2h；
(9) primary finished product is surface-treated, obtains final products.
2. a kind of High-strength environmentally-friefuran Al alloy composite according to claim 1, it is characterised in that: the preparation is former
Material accounting by weight includes 3%Mn, 0.5%Fe, 0.1%Si, 0.01Ti, 0.006%Tl, 0.004%Tc, 0.003%Ce, remaining
Amount is Al and inevitable impurity, and impurity content is less than 0.1%.
3. a kind of High-strength environmentally-friefuran Al alloy composite according to claim 1, it is characterised in that: the protection gas
Body is argon gas or helium.
4. a kind of High-strength environmentally-friefuran Al alloy composite according to claim 1, it is characterised in that: step (5) tool
The operation of body is to be placed in the pressure of 0.8MPa.
5. a kind of High-strength environmentally-friefuran Al alloy composite according to claim 1, it is characterised in that: step (6) will
Pressure locating for primary finished product is adjusted to as 0.7MPa.
6. a kind of High-strength environmentally-friefuran Al alloy composite according to claim 1, it is characterised in that: step (7) will
Pressure locating for primary finished product is adjusted to as 0.4MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810911036.3A CN109055828A (en) | 2018-08-10 | 2018-08-10 | High-strength environment-friendly aluminum alloy composite material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810911036.3A CN109055828A (en) | 2018-08-10 | 2018-08-10 | High-strength environment-friendly aluminum alloy composite material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109055828A true CN109055828A (en) | 2018-12-21 |
Family
ID=64683481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810911036.3A Pending CN109055828A (en) | 2018-08-10 | 2018-08-10 | High-strength environment-friendly aluminum alloy composite material |
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| Country | Link |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1752248A (en) * | 2005-09-29 | 2006-03-29 | 郑州大学 | Deformed Al-Mn series alloy and preparing process thereof |
| CN101713040A (en) * | 2009-12-18 | 2010-05-26 | 中国铝业股份有限公司 | Aluminum-manganese-cobalt die-casting aluminum alloy |
| CN102358927A (en) * | 2011-11-11 | 2012-02-22 | 郴州市强旺新金属材料有限公司 | Aluminium manganese alloy for heat-radiation soft aluminium tube |
| CN102978463A (en) * | 2012-11-09 | 2013-03-20 | 安徽欣意电缆有限公司 | Al-Fe-Tl-RE aluminum alloy, and preparation method and power cable thereof |
| CN103205608A (en) * | 2012-12-26 | 2013-07-17 | 江阴新仁科技有限公司 | Rare earth aluminum-manganese alloy foil used for aluminum honeycomb panel core and preparation method thereof |
| CN106967911A (en) * | 2017-02-27 | 2017-07-21 | 广东省工业分析检测中心 | One kind can anodic oxidation high-strength aluminum alloy and preparation method thereof |
-
2018
- 2018-08-10 CN CN201810911036.3A patent/CN109055828A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1752248A (en) * | 2005-09-29 | 2006-03-29 | 郑州大学 | Deformed Al-Mn series alloy and preparing process thereof |
| CN101713040A (en) * | 2009-12-18 | 2010-05-26 | 中国铝业股份有限公司 | Aluminum-manganese-cobalt die-casting aluminum alloy |
| CN102358927A (en) * | 2011-11-11 | 2012-02-22 | 郴州市强旺新金属材料有限公司 | Aluminium manganese alloy for heat-radiation soft aluminium tube |
| CN102978463A (en) * | 2012-11-09 | 2013-03-20 | 安徽欣意电缆有限公司 | Al-Fe-Tl-RE aluminum alloy, and preparation method and power cable thereof |
| CN103205608A (en) * | 2012-12-26 | 2013-07-17 | 江阴新仁科技有限公司 | Rare earth aluminum-manganese alloy foil used for aluminum honeycomb panel core and preparation method thereof |
| CN106967911A (en) * | 2017-02-27 | 2017-07-21 | 广东省工业分析检测中心 | One kind can anodic oxidation high-strength aluminum alloy and preparation method thereof |
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| CB02 | Change of applicant information |
Address after: 230000 No. 166 Jintang Road, Lujiang High-tech Zone, Hefei City, Anhui Province Applicant after: CHENHANG NEW MATERIAL TECHNOLOGY CO., LTD. Address before: 231500 Lujiang Economic Development Zone, Lujiang County, Hefei City, Anhui Province (west of Jintang Road and south of Zhongtang Road) Applicant before: Anhui Chenhang New Materials Technology Co., Ltd. |
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Application publication date: 20181221 |
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